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Texas A&M University
1.
Angeli, Nicole Frances.
Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation.
Degree: PhD, Wildlife and Fisheries Sciences, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/166899 
► Understanding what allows species to persist is a complex challenge for biodiversity conservation. Biophysical constraints on habitat use and predator evasion can affect the persistence…
(more)
▼ Understanding what allows species to persist is a complex challenge for biodiversity conservation. Biophysical constraints on habitat use and predator evasion can affect the persistence of at-risk species. To study persistence of species threatened by invasive predators, I integrated 1) field surveys to quantify the habitat use of a lizard species (Ameiva polops) that is rare across its landscape due to predation pressure; 2) habitat models to identify suitable habitat for the same rare species; and 3) physiological trials to determine if the widespread persistence of a closely-related lizard species (Ameiva exsul) where predators occur is aided by shifts in its thermal ecology. Multiple datasets generated from my dissertation included field surveys, population demographic models, and physiological datasets. By incorporating fine-scale physiological data into population abundance models, I found that temperature was important for rare and widespread lizards in the genus Ameiva. I estimated occupancy and abundance of Ameiva polops incorporating thermal landscapes (Chapter II). Evaluating the landscape of threats on St. Croix, we find that Ameiva polops may be repatriated to parts of its historic range despite existing threats at broader scales (Chapter III). Last, where widespread species Ameiva exsul co-occurs with mongoose predators, individual lizards have population-level increases in upper thermoregulatory temperatures (Chapter IV).
As a student in the Applied Biodiversity Science Program, I worked with local actors and institutions to implement and promote conservation actions related to these findings.
Advisors/Committee Members: Fitzgerald, Lee A (advisor), Lacher, Thomas (committee member), Ellis, Lisa (committee member), Miles, Donald (committee member).
Subjects/Keywords: Population size; N-mixture models; dispersal; occupancy; operative temperature; conservation introductions; physiology; Ameiva exsul; Ameiva polops
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APA (6th Edition):
Angeli, N. F. (2017). Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/166899
Chicago Manual of Style (16th Edition):
Angeli, Nicole Frances. “Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation.” 2017. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/166899.
MLA Handbook (7th Edition):
Angeli, Nicole Frances. “Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation.” 2017. Web. 28 Feb 2021.
Vancouver:
Angeli NF. Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation. [Internet] [Doctoral dissertation]. Texas A&M University; 2017. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/166899.
Council of Science Editors:
Angeli NF. Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation. [Doctoral Dissertation]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/166899
Texas A&M University
2.
Angeli, Nicole Frances.
Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation.
Degree: PhD, Wildlife and Fisheries Sciences, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/166901
► Understanding what allows species to persist is a complex challenge for biodiversity conservation. Biophysical constraints on habitat use and predator evasion can affect the persistence…
(more)
▼ Understanding what allows species to persist is a complex challenge for biodiversity conservation. Biophysical constraints on habitat use and predator evasion can affect the persistence of at-risk species. To study persistence of species threatened by invasive predators, I integrated 1) field surveys to quantify the habitat use of a lizard species (Ameiva polops) that is rare across its landscape due to predation pressure; 2) habitat models to identify suitable habitat for the same rare species; and 3) physiological trials to determine if the widespread persistence of a closely-related lizard species (Ameiva exsul) where predators occur is aided by shifts in its thermal ecology. Multiple datasets generated from my dissertation included field surveys, population demographic models, and physiological datasets. By incorporating fine-scale physiological data into population abundance models, I found that temperature was important for rare and widespread lizards in the genus Ameiva. I estimated occupancy and abundance of Ameiva polops incorporating thermal landscapes (Chapter II). Evaluating the landscape of threats on St. Croix, we find that Ameiva polops may be repatriated to parts of its historic range despite existing threats at broader scales (Chapter III). Last, where widespread species Ameiva exsul co-occurs with mongoose predators, individual lizards have population-level increases in upper thermoregulatory temperatures (Chapter IV).
As a student in the Applied Biodiversity Science Program, I worked with local actors and institutions to implement and promote conservation actions related to these findings.
Advisors/Committee Members: Fitzgerald, Lee A (advisor), Lacher, Thomas (committee member), Ellis, Lisa (committee member), Miles, Donald (committee member).
Subjects/Keywords: Population size; N-mixture models; dispersal; occupancy; operative temperature; conservation introductions; physiology; Ameiva exsul; Ameiva polops
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APA (6th Edition):
Angeli, N. F. (2017). Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/166901
Chicago Manual of Style (16th Edition):
Angeli, Nicole Frances. “Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation.” 2017. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/166901.
MLA Handbook (7th Edition):
Angeli, Nicole Frances. “Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation.” 2017. Web. 28 Feb 2021.
Vancouver:
Angeli NF. Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation. [Internet] [Doctoral dissertation]. Texas A&M University; 2017. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/166901.
Council of Science Editors:
Angeli NF. Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation. [Doctoral Dissertation]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/166901
Texas A&M University
3.
Schalk, Christopher Michael.
Community Assembly of Neotropical Frogs Across Ecological Scales.
Degree: PhD, Wildlife and Fisheries Sciences, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/157929
► Ecological communities are organized by historical, biotic, and abiotic factors and the strengths of these factors vary across multiple spatial and temporal scales. I sought…
(more)
▼ Ecological communities are organized by historical, biotic, and abiotic factors and the strengths of these factors vary across multiple spatial and temporal scales. I sought to disentangle the drivers of community assembly in frogs of the Bolivian Gran Chaco. This research was conducted within the framework of Applied Biodiversity Science that incorporates collaborations with local institutions to achieve biodiversity conservation. I used functional traits to examine the relationship between species distribution in niche space and community diversity of post-metamorphic frogs. Community organization was non-random, and species-packing significantly increased with increasing community diversity, a pattern indicative of response to environmental filters. I quantified the spatiotemporal dynamics of pond food webs and observed that consumers were trophic generalists, with many species occupying more than one trophic position. Breeding ponds are patchy and ephemeral across the landscape, and being trophic generalists enables consumers to exploit various resources within a pond. I conducted an experiment to examine predator-induced plastic responses in tadpoles of an arid-adapted species, Leptodactylus bufonius, a species with terrestrial oviposition and aquatic development. Tadpoles in the predator treatments exhibited the strongest responses when exposed to both predator and conspecific alarm cues. Species adapted to breed in ephemeral ponds with terrestrial oviposition may be able to afford reduced growth rates by capitalizing on a head start in development. I examined the relationships between calling activity and environmental factors. Calling phenology of tropical anurans is the product of exogenous factors (i.e., climatic variables) and endogenous factors (i.e., reproductive modes). I also studied intra-specific variation in ambush site selection in metamorphs and adults of Ceratophrys cranwelli. Metamorphs selected a subset of available habitat, whereas adult frogs did not appear to select ambush sites based on variables I measured. This study provides insights to the trade-offs between foraging strategy and mortality risk. A synthesis of the diet in frogs of the Family Ceratophryidae revealed they are generalist, opportunistic predators. Contrary to previously published literature, there is little evidence of larval cannibalism in these species. The results of my dissertation provide important biological information useful in developing conservation strategies needed for habitat management and biodiversity conservation.
Advisors/Committee Members: Fitzgerald, Lee (advisor), Lacher, Thomas (committee member), Stronza, Amanda (committee member), Winemiller, Kirk (committee member).
Subjects/Keywords: Anura; Bolivia; Community Structure; Phenology; South America; Gran Chaco; Community Ecology; Tadpole; Environmental Gradients; Functional Morphology; Amphibian; Tropical Ecology
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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APA (6th Edition):
Schalk, C. M. (2016). Community Assembly of Neotropical Frogs Across Ecological Scales. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/157929
Chicago Manual of Style (16th Edition):
Schalk, Christopher Michael. “Community Assembly of Neotropical Frogs Across Ecological Scales.” 2016. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/157929.
MLA Handbook (7th Edition):
Schalk, Christopher Michael. “Community Assembly of Neotropical Frogs Across Ecological Scales.” 2016. Web. 28 Feb 2021.
Vancouver:
Schalk CM. Community Assembly of Neotropical Frogs Across Ecological Scales. [Internet] [Doctoral dissertation]. Texas A&M University; 2016. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/157929.
Council of Science Editors:
Schalk CM. Community Assembly of Neotropical Frogs Across Ecological Scales. [Doctoral Dissertation]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/157929
Texas A&M University
4.
Dittmer, Drew.
Sexual Dimorphism in the Sceloporus undulatus Species Complex.
Degree: MS, Wildlife and Fisheries Sciences, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11692
► The Fence Lizard (Sceloporus undulatus complex) is a wide ranging North American species complex occurring from the eastern seaboard westward through the great plains and…
(more)
▼ The Fence Lizard (Sceloporus undulatus complex) is a wide ranging North American species complex occurring from the eastern seaboard westward through the great plains and central Rocky Mountains and into the American Southwest. A recent phylogeny suggests four species lineages occur within S. undulatus. Traits within an interbreeding species that are influenced by sexual selection are under different selection pressures and may evolve independently from the selective forces of habitat. Sceloporus lizards have several characters that are influenced by sexual selection. I investigated sexual size dimorphism and allometric relationships of body size (snout vent length), torso length, rear leg length and three measurements of head size in 12 populations from the four species in the S. undulatus complex (N=352) specifically looking for variation among the 4 species. Additionally I investigated the size of signal patches between males and females in three species (N=339 specimens of S. consobrinus, S. cowlesi, S. tristichus) of the S. undulatus complex. Sexual confusion, was recently described in a population of the Sceloporus undulatus complex occurring in White Sands, New Mexico and the behavior is correlated with variation in badge size between male and female lizards. To make inferences about sexual confusion at the species level I investigated the presence and absence of signal patches in female lizards, and compare the sizes of signal patches between males and females. My analyses suggest that torso length and head size are significant sources of sexual size dimorphism but the findings differ from earlier published investigations of sexually dimorphic characters in the species complex. I also find support for the S. undulatus complex being generally a female larger species complex. However two of the 12 populations I investigated displayed male biased sexual size dimorphism. Analysis of signal patches across three species of the S. undulatus complex suggests that sexual dimorphism in signal patch size for S. cowlesi and S. tristichus may not prevent sexual confusion. While the near total absence of signal patches in female S. consobrinus is evidence that sexual confusion is not possible with regards to signal patches.
Advisors/Committee Members: Hibbitts, Toby J. (advisor), Fitzgerald, Lee A. (advisor), Woolley, James B. (committee member).
Subjects/Keywords: Sexual Size Dimorphism; Sexual Dimorphism; Conspicuous Colors; Sexual Selection; Morphology; Sceloporus undulatus complex
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APA ·
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APA (6th Edition):
Dittmer, D. (2012). Sexual Dimorphism in the Sceloporus undulatus Species Complex. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11692
Chicago Manual of Style (16th Edition):
Dittmer, Drew. “Sexual Dimorphism in the Sceloporus undulatus Species Complex.” 2012. Masters Thesis, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11692.
MLA Handbook (7th Edition):
Dittmer, Drew. “Sexual Dimorphism in the Sceloporus undulatus Species Complex.” 2012. Web. 28 Feb 2021.
Vancouver:
Dittmer D. Sexual Dimorphism in the Sceloporus undulatus Species Complex. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11692.
Council of Science Editors:
Dittmer D. Sexual Dimorphism in the Sceloporus undulatus Species Complex. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11692
Texas A&M University
5.
Angeli, Nicole Frances.
Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation.
Degree: PhD, Wildlife and Fisheries Sciences, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/169540
► Understanding what allows species to persist is a complex challenge for biodiversity conservation. Biophysical constraints on habitat use and predator evasion can affect the persistence…
(more)
▼ Understanding what allows species to persist is a complex challenge for biodiversity conservation. Biophysical constraints on habitat use and predator evasion can affect the persistence of at-risk species. To study persistence of species threatened by invasive predators, I integrated 1) field surveys to quantify the habitat use of a lizard species (Ameiva polops) that is rare across its landscape due to predation pressure; 2) habitat models to identify suitable habitat for the same rare species; and 3) physiological trials to determine if the widespread persistence of a closely-related lizard species (Ameiva exsul) where predators occur is aided by shifts in its thermal ecology. Multiple datasets generated from my dissertation included field surveys, population demographic models, and physiological datasets. By incorporating fine-scale physiological data into population abundance models, I found that temperature was important for rare and widespread lizards in the genus Ameiva. I estimated occupancy and abundance of Ameiva polops incorporating thermal landscapes (Chapter II). Evaluating the landscape of threats on St. Croix, we find that Ameiva polops may be repatriated to parts of its historic range despite existing threats at broader scales (Chapter III). Last, where widespread species Ameiva exsul co-occurs with mongoose predators, individual lizards have population-level increases in upper thermoregulatory temperatures (Chapter IV).
As a student in the Applied Biodiversity Science Program, I worked with local actors and institutions to implement and promote conservation actions related to these findings.
Advisors/Committee Members: Fitzgerald, Lee A (advisor), Lacher, Thomas (committee member), Ellis, Lisa (committee member), Miles, Donald (committee member).
Subjects/Keywords: Population size; N-mixture models; dispersal; occupancy; operative temperature; conservation introductions; physiology; Ameiva exsul; Ameiva polops
Record Details
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Share »
Record Details
Similar Records
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Angeli, N. F. (2017). Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/169540
Chicago Manual of Style (16th Edition):
Angeli, Nicole Frances. “Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation.” 2017. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/169540.
MLA Handbook (7th Edition):
Angeli, Nicole Frances. “Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation.” 2017. Web. 28 Feb 2021.
Vancouver:
Angeli NF. Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation. [Internet] [Doctoral dissertation]. Texas A&M University; 2017. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/169540.
Council of Science Editors:
Angeli NF. Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation. [Doctoral Dissertation]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/169540
Texas A&M University
6.
Angeli, Nicole Frances.
Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation.
Degree: PhD, Wildlife and Fisheries Sciences, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/169538
► Understanding what allows species to persist is a complex challenge for biodiversity conservation. Biophysical constraints on habitat use and predator evasion can affect the persistence…
(more)
▼ Understanding what allows species to persist is a complex challenge for biodiversity conservation. Biophysical constraints on habitat use and predator evasion can affect the persistence of at-risk species. To study persistence of species threatened by invasive predators, I integrated 1) field surveys to quantify the habitat use of a lizard species (Ameiva polops) that is rare across its landscape due to predation pressure; 2) habitat models to identify suitable habitat for the same rare species; and 3) physiological trials to determine if the widespread persistence of a closely-related lizard species (Ameiva exsul) where predators occur is aided by shifts in its thermal ecology. Multiple datasets generated from my dissertation included field surveys, population demographic models, and physiological datasets. By incorporating fine-scale physiological data into population abundance models, I found that temperature was important for rare and widespread lizards in the genus Ameiva. I estimated occupancy and abundance of Ameiva polops incorporating thermal landscapes (Chapter II). Evaluating the landscape of threats on St. Croix, we find that Ameiva polops may be repatriated to parts of its historic range despite existing threats at broader scales (Chapter III). Last, where widespread species Ameiva exsul co-occurs with mongoose predators, individual lizards have population-level increases in upper thermoregulatory temperatures (Chapter IV).
As a student in the Applied Biodiversity Science Program, I worked with local actors and institutions to implement and promote conservation actions related to these findings.
Advisors/Committee Members: Fitzgerald, Lee A (advisor), Lacher, Thomas (committee member), Ellis, Lisa (committee member), Miles, Donald (committee member).
Subjects/Keywords: Population size; N-mixture models; dispersal; occupancy; operative temperature; conservation introductions; physiology; Ameiva exsul; Ameiva polops
Record Details
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Record Details
Similar Records
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Angeli, N. F. (2017). Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/169538
Chicago Manual of Style (16th Edition):
Angeli, Nicole Frances. “Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation.” 2017. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/169538.
MLA Handbook (7th Edition):
Angeli, Nicole Frances. “Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation.” 2017. Web. 28 Feb 2021.
Vancouver:
Angeli NF. Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation. [Internet] [Doctoral dissertation]. Texas A&M University; 2017. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/169538.
Council of Science Editors:
Angeli NF. Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation. [Doctoral Dissertation]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/169538
Texas A&M University
7.
Hughes, Christi Lynn.
Characterization of Sea Turtle Nesting on the Upper Texas Coast.
Degree: MS, Wildlife and Fisheries Sciences, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/152693
► Nearly annual record Kemp’s ridley sea turtle (Lepidochelys kempii) nesting activity on the upper Texas coast (UTC; defined as beaches from Sabine Pass to Matagorda…
(more)
▼ Nearly annual record Kemp’s ridley sea turtle (Lepidochelys kempii) nesting activity on
the upper
Texas coast (UTC; defined as beaches from Sabine Pass to Matagorda
Peninsula), where scientifically verifiable nesting commenced in 2002, has occurred
concurrently with recent exponential increases in the nesting population of this critically
endangered species. Increased likelihood for anthropogenic interaction with this growing
assemblage of UTC nesters mandated documentation of nesting activity on rapidly
developing UTC beaches and characterization of in-water movements of mature
conspecifics.
Standardized sea turtle nesting patrols implemented on the beaches of Bolivar Peninsula,
Galveston Island, and Follets Island to quantify nesting activity, as well as associated
beach habitat assessments, identified major deterrents to sea turtle reproductive success
and established a scientific baseline necessary for resource managers to facilitate the
perpetuation of nesting activity. During 2007-2009, weekday ATV and pedestrian
patrols of stated beaches during nesting season (1 April – 15 July) aided the
documentation of 15-16 UTC Kemp’s ridley nests annually. Nests were predominantly
located on patrolled beaches and represented 8-12% of Texas’ annual statewide nesting
total. Mean emergence success rate for four clutches incubated in-situ was 91.8%.
Eight nesting females intercepted on UTC beaches, as well as a rehabilitated adult male,
were satellite tagged. Spatially- and/or temporally-restricted usage of breeding,
internesting, migratory, and/or foraging areas in the northern Gulf of Mexico was
identified and warrants further examination to facilitate the implementation of
conservation initiatives designed to mitigate associated consequential mortality factors.
Female internesting period movements were primarily confined to nearshore waters
between Galveston and Matagorda Bays, while post-nesting movements in waters <83
m
in depth ranged from
Texas to the Florida Keys. Male movements near UTC beaches
one year post-release were potentially indicative of breeding. Three years of subsequent
monitoring indicated this male established long-term seasonal residency on offshore
Louisiana foraging grounds.
Nesting and telemetry data indicate the UTC is becoming increasingly important to the
Kemp’s ridley population. However, current regulations do not support the sustainment
of the UTC nesting cohort. Management recommendations to simultaneously foster UTC
nesting and promote the continued recovery of the Kemp’s ridley sea turtle are provided
herein.
Advisors/Committee Members: Landry, Andre M (advisor), Fitzgerald, Lee A (committee member), Plotkin, Pamela T (committee member), Seney, Erin E (committee member).
Subjects/Keywords: Kemp's ridley; sea turtle; nesting; satellite telemetry; beach habitat
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APA ·
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APA (6th Edition):
Hughes, C. L. (2014). Characterization of Sea Turtle Nesting on the Upper Texas Coast. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/152693
Chicago Manual of Style (16th Edition):
Hughes, Christi Lynn. “Characterization of Sea Turtle Nesting on the Upper Texas Coast.” 2014. Masters Thesis, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/152693.
MLA Handbook (7th Edition):
Hughes, Christi Lynn. “Characterization of Sea Turtle Nesting on the Upper Texas Coast.” 2014. Web. 28 Feb 2021.
Vancouver:
Hughes CL. Characterization of Sea Turtle Nesting on the Upper Texas Coast. [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/152693.
Council of Science Editors:
Hughes CL. Characterization of Sea Turtle Nesting on the Upper Texas Coast. [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/152693
Texas A&M University
8.
Riedle, Jimmy.
Aquatic Vertebrate Assemblages in the Middle Trinity River Basin, with Emphasis on Turtles.
Degree: PhD, Wildlife and Fisheries Sciences, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/152827
► Rivers are dynamic ecosystems with considerable heterogeneity across multiple spatial scales. Environmental factors, such as depth, physical structure, flow regime and habitat connectivity influence species…
(more)
▼ Rivers are dynamic ecosystems with considerable heterogeneity across multiple
spatial scales. Environmental factors, such as depth, physical structure, flow regime and
habitat connectivity influence species distributions across a floodplain, and subsequently
there is a large body of work focused on understanding how these factors influence the
structure of fish communities. There has also been increasing interest in understanding
how environmental variation influences the community structure of another major
aquatic vertebrate group, the turtles. I sampled fish and turtles at Gus Engeling Wildlife
Management Area (WMA) and used ordination analyses to visualize environmental
gradients that may influence community structure for these two vertebrate groups.
Distributions of aquatic turtles and fishes at Gus Engeling WMA were associated with
environmental gradients defined by flow regimes and substrate composition. When just
turtles were considered, flow regimes were particularly important in describing habitat
partitioning among species, particularly confamilial groups. A second study site, Keechi
Creek WMA, was sampled for turtles in 2009. Keechi Creek WMA exhibited less
habitat heterogeneity than Gus Engeling WMA, and as heterogeneity decreased between
the two study sites, turtle species richness decreased, whereas habitat overlap between
species increased. I analyzed the capture efficiency of 7 trap types used throughout the
course of this project and found that effectiveness of each trap type varied by habitat
type, species, and shell size. So, using a diversity of trap types increased my overall
trapping success.
Advisors/Committee Members: Fitzgerald, Lee A (advisor), Kazmaier, Richard T (committee member), Winemiller, Kirk O (committee member), Olszewski, Tom (committee member).
Subjects/Keywords: Turtle; Community Ecology
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APA (6th Edition):
Riedle, J. (2014). Aquatic Vertebrate Assemblages in the Middle Trinity River Basin, with Emphasis on Turtles. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/152827
Chicago Manual of Style (16th Edition):
Riedle, Jimmy. “Aquatic Vertebrate Assemblages in the Middle Trinity River Basin, with Emphasis on Turtles.” 2014. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/152827.
MLA Handbook (7th Edition):
Riedle, Jimmy. “Aquatic Vertebrate Assemblages in the Middle Trinity River Basin, with Emphasis on Turtles.” 2014. Web. 28 Feb 2021.
Vancouver:
Riedle J. Aquatic Vertebrate Assemblages in the Middle Trinity River Basin, with Emphasis on Turtles. [Internet] [Doctoral dissertation]. Texas A&M University; 2014. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/152827.
Council of Science Editors:
Riedle J. Aquatic Vertebrate Assemblages in the Middle Trinity River Basin, with Emphasis on Turtles. [Doctoral Dissertation]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/152827
Texas A&M University
9.
Treglia, Michael Louis.
Multi-Scale Conservation in an Altered Landscape: The Case of the Endangered Arroyo Toad in Southern California.
Degree: PhD, Wildlife and Fisheries Sciences, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/153478
► Habitat loss and degradation are recognized as significant drivers of biodiversity loss in terrestrial and freshwater ecosystems. These issues are often associated with anthropogenic land…
(more)
▼ Habitat loss and degradation are recognized as significant drivers of biodiversity loss in terrestrial and freshwater ecosystems. These issues are often associated with anthropogenic land cover changes, which can have direct and indirect impacts on species, and conservation strategies must take both into account for long-term success. I focused this dissertation on the endangered arroyo toad (Anaxyrus califonicus), endemic to southern California, USA and northern Baja California, Mexico. The species relies on open, sandy streams for breeding and larval development, and the adjacent terrestrial environments for post-metamorphosis life stages; primary threats include destruction and degradation of these habitats.
I conducted three studies to better understand threats to, and identify conservation opportunities for arroyo toads in southern California. First, I developed distribution models that enabled me to identify areas that could be used to create habitat for the species, which could then be colonized by nearby populations or populated via translocation efforts. Second, I used structural equation modeling to investigate relationships among land cover characteristics at multiple spatial scales and suitability of riparian areas for arroyo toads. This study yielded insight into how land cover of entire watersheds and along stream networks influence arroyo toad habitat. Lastly, I used a structural equation model in conjunction with a projection of development for my study area to forecast how future urbanization may influence suitability of habitats for arroyo toads in individual watersheds. I compared results for scenarios with high and low levels of urbanization, and found conservation of natural land covers at the watershed scale can ultimately help maintain habitat in the long-term.
The results of these studies may guide both immediate and future conservation efforts for arroyo toads in my study area. My approaches can be applied to other systems for understanding conservation issues affecting other species. Furthermore, future work may build on this research to inform conservation in other parts of the arroyo toad’s range, and models can be iteratively improved as land cover changes occur and the species responds through time.
Advisors/Committee Members: Fitzgerald, Lee A (advisor), Fisher, Robert N (committee member), Guneralp, Inci (committee member), Kyle, Gerard T (committee member).
Subjects/Keywords: arroyo toad; Anaxyrus californicus; Bufonidae; landscape conservation; structural equation model; distribution model; forecasting; land cover change
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APA (6th Edition):
Treglia, M. L. (2014). Multi-Scale Conservation in an Altered Landscape: The Case of the Endangered Arroyo Toad in Southern California. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153478
Chicago Manual of Style (16th Edition):
Treglia, Michael Louis. “Multi-Scale Conservation in an Altered Landscape: The Case of the Endangered Arroyo Toad in Southern California.” 2014. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/153478.
MLA Handbook (7th Edition):
Treglia, Michael Louis. “Multi-Scale Conservation in an Altered Landscape: The Case of the Endangered Arroyo Toad in Southern California.” 2014. Web. 28 Feb 2021.
Vancouver:
Treglia ML. Multi-Scale Conservation in an Altered Landscape: The Case of the Endangered Arroyo Toad in Southern California. [Internet] [Doctoral dissertation]. Texas A&M University; 2014. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/153478.
Council of Science Editors:
Treglia ML. Multi-Scale Conservation in an Altered Landscape: The Case of the Endangered Arroyo Toad in Southern California. [Doctoral Dissertation]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153478
Texas A&M University
10.
Smolensky, Nicole Limunga.
Biodiversity Conservation in Sub-Saharan Africa: A Case Study of the African Dwarf Crocodiles (Osteolaemus Spp.).
Degree: PhD, Wildlife and Fisheries Sciences, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/154085
► Overexploitation of wildlife is a leading threat to biodiversity in tropical Africa. Effective management requires integrating information on the extent of exploitation, distribution, and status…
(more)
▼ Overexploitation of wildlife is a leading threat to biodiversity in tropical Africa. Effective management requires integrating information on the extent of exploitation, distribution, and status of exploited species. I explore how trade filters affected the final destination of bushmeat for different species involved in the trade. I highlight the trade in reptiles, in particular African Dwarf Crocodiles (Osteolaemus tetraspis) to investigate why they are rare in markets yet ubiquitously hunted. Hunting locations and methods determined the types of species entering bushmeat markets while selling conditions and prices determined whether species were traded locally or in urban markets.
To prioritize conservation efforts of over-exploited species, it is important to determine the distribution and status of populations. I conducted detailed sampling of Osteolaemus populations in Cameroon and around the Cameroon Volcanic Line (CVL), to investigate the distributional limits and number of cryptic Osteolaemus species in the country. I found that O. tetraspis extends west beyond the CVL, thus, this mountain chain does not represent the distributional limit of this species. I also found O. osborni in Cameroon. I provided information on the population ecology of O. tetraspis and O. osborni in Cameroon to facilitate independent conservation of these two species. Both species are threatened in Cameroon based upon low encounter rates, young population structures and continued threats of habitat loss and hunting pressure.
Crocodilians link nutrients and energy between food webs through their movements across heterogeneous habitats. These connections may differ among habitats and as they undergo ontogenetic shifts in diet. I compared food web associations of Ostoelaemus species inhabiting a large river and small tributary using stable isotope analyses of carbon and nitrogen. Osteolaemus species inhabiting perennial rivers have aquatic food web associations as opposed to the largely terrestrial food web associations detected when they occupy swamp habitats. These species have large dietary overlap between juveniles, adults and, sexes.
Through my research, I have provided a working knowledge of the distribution, ecology, and hunting pressure of Osteolaemus species necessary for assessing their conservation status and developing sound management. These widely distributed species should be regionally managed to conserve their evolutionary diversity.
Advisors/Committee Members: Fitzgerald, Lee A (advisor), Alvard, Michael (committee member), Hibbitts, Toby J (committee member), Hurtado, Luis (committee member).
Subjects/Keywords: bushmeat; Cameroon; cryptic species; Osteolaemus; phylogeography; stable isotopes
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APA (6th Edition):
Smolensky, N. L. (2014). Biodiversity Conservation in Sub-Saharan Africa: A Case Study of the African Dwarf Crocodiles (Osteolaemus Spp.). (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/154085
Chicago Manual of Style (16th Edition):
Smolensky, Nicole Limunga. “Biodiversity Conservation in Sub-Saharan Africa: A Case Study of the African Dwarf Crocodiles (Osteolaemus Spp.).” 2014. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/154085.
MLA Handbook (7th Edition):
Smolensky, Nicole Limunga. “Biodiversity Conservation in Sub-Saharan Africa: A Case Study of the African Dwarf Crocodiles (Osteolaemus Spp.).” 2014. Web. 28 Feb 2021.
Vancouver:
Smolensky NL. Biodiversity Conservation in Sub-Saharan Africa: A Case Study of the African Dwarf Crocodiles (Osteolaemus Spp.). [Internet] [Doctoral dissertation]. Texas A&M University; 2014. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/154085.
Council of Science Editors:
Smolensky NL. Biodiversity Conservation in Sub-Saharan Africa: A Case Study of the African Dwarf Crocodiles (Osteolaemus Spp.). [Doctoral Dissertation]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/154085
Texas A&M University
11.
Leavitt, Daniel 1979-.
Ecological Consequences of Landscape Fragmentation on the Lizard Community in the Mescalero-Monahans Shinnery Sands.
Degree: PhD, Wildlife and Fisheries Sciences, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/148128
► Landscape fragmentation poses a major threat to biodiversity world-wide. The goal of my dissertation research was to determine the effects of landscape fragmentation on a…
(more)
▼ Landscape fragmentation poses a major threat to biodiversity world-wide. The goal of my dissertation research was to determine the effects of landscape fragmentation on a lizard community in the Mescalero-Monahans shinnery sands, New Mexico and the extent to which conservation efforts might protect biodiversity in this ecosystem. My research relied heavily on data collected from a large-scale spatially-replicated comparative study. The purpose of this study was to evaluate the impacts of landscape fragmentation as a result of oil and gas development on the dunes sagebrush lizard (Sceloporus arenicolus).
Results from analysis of lizard community structure indicate that fragmented sites are less diverse than non-fragmented sites. In particular, two species are found in lower density and occupancy in the fragmented locations (Holbrookia maculata and Sceloporus arenicolus). Analysis of landscape configuration at the scale of a trapping grid indicated that sand dune blowout shape and size differed between fragmented and non-fragmented locations. Differences in landscape pattern were associated with reduced lizard diversity. Because of this association between lower diversity and altered landscape pattern, extensive alterations to landscape pattern may cause disassembly at the ecosystem level. The maintenance of existing landscape pattern may be important to the maintenance of diversity in this ecosystem.
Evaluations of habitat use patterns of the lizards in this community demonstrate that a few species have narrow preferences for certain habitats. In particular, H. maculata, Phrynosoma cornutum, and S. arenicolus all demonstrated narrow habitat use patterns. Effect size of fragmentation for each species indicated that the same three species showed a large effect when comparing their average abundances between fragmented and non-fragmented locations. Thus species that are most likely to benefit or be harmed by landscape fragmentation are those with the most specific habitat requirements.
Umbrella species represent one of many approaches to conservation using surrogate species. I used data on ants, beetles, small mammals, lizards, and endemic species to test the use of the dunes sagebrush lizard (Sceloporus arenicolus) as an umbrella for endemism and biodiversity of the Mescalero-Monahans shinnery sands ecosystem. I applied a comparative approach at three spatial scales to examine how conservation practices at different scales may affect biodiversity and endemism in this ecosystem. At the largest scale, the frequency of occurrence for endemic species increased though no other patterns emerged because S. arenicolus was present at all sites and there were no relationships between relative abundances of S. arenicolus and the other taxonomic groups. At the smallest scale, both beetle species richness, diversity, and endemic species richness were higher in the presence of S. arenicolus. To protect biodiversity in this ecosystem, conservation efforts should focus on protection at the scale of the species…
Advisors/Committee Members: Fitzgerald, Lee A (advisor), Dixon, James R (committee member), Roelke, Daniel L (committee member), Rogers, William E (committee member), Winemiller, Kirk O (committee member).
Subjects/Keywords: specialist species; umbrella species; conservation; habitat; niche; community; Sceloporus arenicolus; lizards; fragmentation; ecology
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APA (6th Edition):
Leavitt, D. 1. (2012). Ecological Consequences of Landscape Fragmentation on the Lizard Community in the Mescalero-Monahans Shinnery Sands. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148128
Chicago Manual of Style (16th Edition):
Leavitt, Daniel 1979-. “Ecological Consequences of Landscape Fragmentation on the Lizard Community in the Mescalero-Monahans Shinnery Sands.” 2012. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/148128.
MLA Handbook (7th Edition):
Leavitt, Daniel 1979-. “Ecological Consequences of Landscape Fragmentation on the Lizard Community in the Mescalero-Monahans Shinnery Sands.” 2012. Web. 28 Feb 2021.
Vancouver:
Leavitt D1. Ecological Consequences of Landscape Fragmentation on the Lizard Community in the Mescalero-Monahans Shinnery Sands. [Internet] [Doctoral dissertation]. Texas A&M University; 2012. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/148128.
Council of Science Editors:
Leavitt D1. Ecological Consequences of Landscape Fragmentation on the Lizard Community in the Mescalero-Monahans Shinnery Sands. [Doctoral Dissertation]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148128
Texas A&M University
12.
Roach, Katherine.
Large River Food Webs: Influence of Nutrients, Turbidity, and Flow, and Implications for Management.
Degree: PhD, Wildlife and Fisheries Sciences, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11633
► Humans impact rivers in many ways that modify ecological processes yielding ecosystem services. In order to mitigate anthropogenic impacts, scientists are challenged to understand interactions…
(more)
▼ Humans impact rivers in many ways that modify ecological processes yielding ecosystem services. In order to mitigate anthropogenic impacts, scientists are challenged to understand interactions among physicochemical factors affecting large river food webs. An understanding of socioeconomic factors also is critical for ecosystem management. In this dissertation, I explore spatiotemporal patterns in floodplain river food webs and political barriers to management of environmental flows, an important factor influencing river ecology.
In Chapter II, I reviewed the scientific literature to test conceptual models of river food webs and predictions of environmental factors that might produce variation in basal production sources supporting consumer biomass. My review indicates that algae are the predominant production source for large rivers worldwide, but consumers assimilate C3 plants in rivers 1) with high sediment loads and low transparency during high flow pulses, 2) with high dissolved organic matter concentrations, and 3) following periods of high discharge or leaf litter fall that increase the amount of terrestrial material in the particulate organic matter pool.
In Chapter III, I descrobe field research conducted to examine relationships among hydrology, nutrient concentrations, turbidity, and algal primary production and biomass in the littoral zone of five rivers in
Texas, Peru, and Venezuela differing in physicochemical conditions. I used stable isotope signatures to estimate contributions of algal-versus terrestrial-based production sources to consumers during different hydrologic periods. My research indicates that during flow pulses in floodplain rivers, a decrease in algal biomass and productivity, combined with increased inputs of terrestrial organic matter, can result in increased terrestrial support of metazoan consumers in the aquatic food web.
In 2007,
Texas Senate Bill 3 directed that environmental flow recommendations be developed for river basins. Despite emphasis on use of the "best available science" to develop environmental flow regimes and "stakeholder involvement" to address needs of all water users, for the first two basins to complete the SB3 process, final environmental flow rules did not mimic a natural flow regime. In Chapter IV, I reviewed this process, concluding that incentives for river authorities to increase compromise with diverse stakeholders should result in more sustainable management of freshwater.
Advisors/Committee Members: Winemiller, Kirk O. (advisor), Davis III, Stephen E. (committee member), Eubanks, Micky D. (committee member), Fitzgerald, Lee A. (committee member), Stronza, Amanda L. (committee member).
Subjects/Keywords: food web; instream flow; nutrients; primary production; river; Texas Senate Bill 3; turbidity
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APA (6th Edition):
Roach, K. (2012). Large River Food Webs: Influence of Nutrients, Turbidity, and Flow, and Implications for Management. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11633
Chicago Manual of Style (16th Edition):
Roach, Katherine. “Large River Food Webs: Influence of Nutrients, Turbidity, and Flow, and Implications for Management.” 2012. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11633.
MLA Handbook (7th Edition):
Roach, Katherine. “Large River Food Webs: Influence of Nutrients, Turbidity, and Flow, and Implications for Management.” 2012. Web. 28 Feb 2021.
Vancouver:
Roach K. Large River Food Webs: Influence of Nutrients, Turbidity, and Flow, and Implications for Management. [Internet] [Doctoral dissertation]. Texas A&M University; 2012. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11633.
Council of Science Editors:
Roach K. Large River Food Webs: Influence of Nutrients, Turbidity, and Flow, and Implications for Management. [Doctoral Dissertation]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11633
13.
Adamek, Krista Anne.
Temporal Variation in Space and Resource Use of Macaws in the Southeastern Peruvian Amazon.
Degree: MS, Wildlife and Fisheries Sciences, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9047
► Space use and resource use of three species of macaws (Ara ararauna, A. chloropterus, and A. macao) were studied for a period of three years…
(more)
▼ Space use and resource use of three species of macaws (Ara ararauna, A. chloropterus, and A. macao) were studied for a period of three years in the southeastern Peruvian Amazon. Basic information on wild macaw populations is lacking due to the logistical and behavioral challenges of working with these species in dense rainforest. Population declines world-wide have been attributed significantly to a reduction in food and nesting resources due to habitat loss. This research aims to obtain baseline data on macaws in a region with relatively intact rainforest. Specific objectives were to (1) quantify space use, describe the spatial and temporal variation in movement patterns, explore habitat selection and spatial pattern of resources during the non-breeding season, and (2) identify key nesting and foraging species and determine whether there is seasonal variation in diet, and explore how resources may be related to movements and competition.
Individuals from each species were radio-tagged and monitored from 2004 to 2008 by ground, platform, and aerial tracking. Seasonal ranges were estimated using MCP and KDE methods. Diversity and niche measurements and selection were calculated for dietary items, nesting substrate, and habitat. The relationship between palm habitat distribution and A. ararauna movements was explored using landscape analysis techniques.
All species had similar home range sizes during the breeding season, ranging from a mean of 1,540 ha to 2,541 ha. Non-breeding ranges were significantly larger for A. ararauna (117,849 ha). Greater than 200 species of plants were consumed, yet seasonal preferences vary. The increase in dietary breadth and decrease in overlap during dry season is unlikely related to food scarcity or competition. Key nesting and dietary species include Mauritia flexuosa, Dipterix micrantha, and Bertholletia excelsa. Palm habitat is a key resource for Ara ararauna and associated with long-distance movements.
This research addresses a critical gap in our knowledge regarding macaw movements and resource use in Amazonian rainforest. Despite their mobility, their low fecundity and specialized nesting requirements can impact reproductive success and population growth if habitat loss continues on its current trajectory.
Advisors/Committee Members: Lacher, Jr., Thomas E. (advisor), Fitzgerald, Lee (committee member), Feagin, Rusty (committee member).
Subjects/Keywords: macaw; amazon; home range; resource use; seasonality
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APA (6th Edition):
Adamek, K. A. (2012). Temporal Variation in Space and Resource Use of Macaws in the Southeastern Peruvian Amazon. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9047
Chicago Manual of Style (16th Edition):
Adamek, Krista Anne. “Temporal Variation in Space and Resource Use of Macaws in the Southeastern Peruvian Amazon.” 2012. Masters Thesis, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9047.
MLA Handbook (7th Edition):
Adamek, Krista Anne. “Temporal Variation in Space and Resource Use of Macaws in the Southeastern Peruvian Amazon.” 2012. Web. 28 Feb 2021.
Vancouver:
Adamek KA. Temporal Variation in Space and Resource Use of Macaws in the Southeastern Peruvian Amazon. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9047.
Council of Science Editors:
Adamek KA. Temporal Variation in Space and Resource Use of Macaws in the Southeastern Peruvian Amazon. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9047
14.
Angeli, Nicole Frances.
Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation.
Degree: PhD, Wildlife and Fisheries Sciences, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/169662
► Understanding what allows species to persist is a complex challenge for biodiversity conservation. Biophysical constraints on habitat use and predator evasion can affect the persistence…
(more)
▼ Understanding what allows species to persist is a complex challenge for biodiversity conservation. Biophysical constraints on habitat use and predator evasion can affect the persistence of at-risk species. To study persistence of species threatened by invasive predators, I integrated 1) field surveys to quantify the habitat use of a lizard species (Ameiva polops) that is rare across its landscape due to predation pressure; 2) habitat models to identify suitable habitat for the same rare species; and 3) physiological trials to determine if the widespread persistence of a closely-related lizard species (Ameiva exsul) where predators occur is aided by shifts in its thermal ecology. Multiple datasets generated from my dissertation included field surveys, population demographic models, and physiological datasets. By incorporating fine-scale physiological data into population abundance models, I found that temperature was important for rare and widespread lizards in the genus Ameiva. I estimated occupancy and abundance of Ameiva polops incorporating thermal landscapes (Chapter II). Evaluating the landscape of threats on St. Croix, we find that Ameiva polops may be repatriated to parts of its historic range despite existing threats at broader scales (Chapter III). Last, where widespread species Ameiva exsul co-occurs with mongoose predators, individual lizards have population-level increases in upper thermoregulatory temperatures (Chapter IV).
As a student in the Applied Biodiversity Science Program, I worked with local actors and institutions to implement and promote conservation actions related to these findings.
Advisors/Committee Members: Fitzgerald, Lee A (advisor), Lacher, Thomas (committee member), Ellis, Lisa (committee member), Miles, Donald (committee member).
Subjects/Keywords: Population size; N-mixture models; dispersal; occupancy; operative temperature; conservation introductions; physiology; Ameiva exsul; Ameiva polops
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CSE |
Export
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APA (6th Edition):
Angeli, N. F. (2017). Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/169662
Chicago Manual of Style (16th Edition):
Angeli, Nicole Frances. “Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation.” 2017. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/169662.
MLA Handbook (7th Edition):
Angeli, Nicole Frances. “Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation.” 2017. Web. 28 Feb 2021.
Vancouver:
Angeli NF. Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation. [Internet] [Doctoral dissertation]. Texas A&M University; 2017. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/169662.
Council of Science Editors:
Angeli NF. Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed Habitat, Physiology, and Predation. [Doctoral Dissertation]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/169662
15.
Angeli, Nicole Frances.
Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation.
Degree: PhD, Wildlife and Fisheries Sciences, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/166900
► Understanding what allows species to persist is a complex challenge for biodiversity conservation. Biophysical constraints on habitat use and predator evasion can affect the persistence…
(more)
▼ Understanding what allows species to persist is a complex challenge for biodiversity conservation. Biophysical constraints on habitat use and predator evasion can affect the persistence of at-risk species. To study persistence of species threatened by invasive predators, I integrated 1) field surveys to quantify the habitat use of a lizard species (Ameiva polops) that is rare across its landscape due to predation pressure; 2) habitat models to identify suitable habitat for the same rare species; and 3) physiological trials to determine if the widespread persistence of a closely-related lizard species (Ameiva exsul) where predators occur is aided by shifts in its thermal ecology. Multiple datasets generated from my dissertation included field surveys, population demographic models, and physiological datasets. By incorporating fine-scale physiological data into population abundance models, I found that temperature was important for rare and widespread lizards in the genus Ameiva. I estimated occupancy and abundance of Ameiva polops incorporating thermal landscapes (Chapter II). Evaluating the landscape of threats on St. Croix, we find that Ameiva polops may be repatriated to parts of its historic range despite existing threats at broader scales (Chapter III). Last, where widespread species Ameiva exsul co-occurs with mongoose predators, individual lizards have population-level increases in upper thermoregulatory temperatures (Chapter IV).
As a student in the Applied Biodiversity Science Program, I worked with local actors and institutions to implement and promote conservation actions related to these findings.
Advisors/Committee Members: Fitzgerald, Lee A (advisor), Lacher, Thomas (committee member), Ellis, Lisa (committee member), Miles, Donald (committee member).
Subjects/Keywords: Population size; N-mixture models; dispersal; occupancy; operative temperature; conservation introductions; physiology; Ameiva exsul; Ameiva polops
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Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Angeli, N. F. (2017). Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/166900
Chicago Manual of Style (16th Edition):
Angeli, Nicole Frances. “Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation.” 2017. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/166900.
MLA Handbook (7th Edition):
Angeli, Nicole Frances. “Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation.” 2017. Web. 28 Feb 2021.
Vancouver:
Angeli NF. Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation. [Internet] [Doctoral dissertation]. Texas A&M University; 2017. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/166900.
Council of Science Editors:
Angeli NF. Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation. [Doctoral Dissertation]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/166900
16.
Angeli, Nicole Frances.
Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation.
Degree: PhD, Wildlife and Fisheries Sciences, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/166898
► Understanding what allows species to persist is a complex challenge for biodiversity conservation. Biophysical constraints on habitat use and predator evasion can affect the persistence…
(more)
▼ Understanding what allows species to persist is a complex challenge for biodiversity conservation. Biophysical constraints on habitat use and predator evasion can affect the persistence of at-risk species. To study persistence of species threatened by invasive predators, I integrated 1) field surveys to quantify the habitat use of a lizard species (Ameiva polops) that is rare across its landscape due to predation pressure; 2) habitat models to identify suitable habitat for the same rare species; and 3) physiological trials to determine if the widespread persistence of a closely-related lizard species (Ameiva exsul) where predators occur is aided by shifts in its thermal ecology. Multiple datasets generated from my dissertation included field surveys, population demographic models, and physiological datasets. By incorporating fine-scale physiological data into population abundance models, I found that temperature was important for rare and widespread lizards in the genus Ameiva. I estimated occupancy and abundance of Ameiva polops incorporating thermal landscapes (Chapter II). Evaluating the landscape of threats on St. Croix, we find that Ameiva polops may be repatriated to parts of its historic range despite existing threats at broader scales (Chapter III). Last, where widespread species Ameiva exsul co-occurs with mongoose predators, individual lizards have population-level increases in upper thermoregulatory temperatures (Chapter IV).
As a student in the Applied Biodiversity Science Program, I worked with local actors and institutions to implement and promote conservation actions related to these findings.
Advisors/Committee Members: Fitzgerald, Lee A (advisor), Lacher, Thomas (committee member), Ellis, Lisa (committee member), Miles, Donald (committee member).
Subjects/Keywords: Population size; N-mixture models; dispersal; occupancy; operative temperature; conservation introductions; physiology; Ameiva exsul; Ameiva polops
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APA (6th Edition):
Angeli, N. F. (2017). Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/166898
Chicago Manual of Style (16th Edition):
Angeli, Nicole Frances. “Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation.” 2017. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/166898.
MLA Handbook (7th Edition):
Angeli, Nicole Frances. “Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation.” 2017. Web. 28 Feb 2021.
Vancouver:
Angeli NF. Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation. [Internet] [Doctoral dissertation]. Texas A&M University; 2017. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/166898.
Council of Science Editors:
Angeli NF. Identifying Mechanisms of Persistence for Ground Lizards (Reptilia: Ameiva) in the Caribbean Informed bHabitat, Physiology, and Predation. [Doctoral Dissertation]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/166898
17.
Johnson, James Bradley.
The Architecture of Phenotypes in a Naturally Hybridizing Complex of Xiphophorus Fishes.
Degree: PhD, Zoology, 2013, Texas A&M University
URL: http://hdl.handle.net/1969.1/149426
► The origin and maintenance of phenotypic variation has generated considerable interest among students of functional morphology, sexual selection and behavioral ecology. In particular, hybridization has…
(more)
▼ The origin and maintenance of phenotypic variation has generated considerable interest among students of functional morphology, sexual selection and behavioral ecology. In particular, hybridization has been suggested as a phenomenon which may generate novel phenotypic variation. In this dissertation I focus on the Xiphophorus birchmanni - X. malinche hybrid system to assess the role of hybridization in altering behavioral, morphological, sexual and non-sexual traits. I determine the relationship between the sword sexual ornament and body condition to support previous work which suggests that the sword is an inexpensive means to increase apparent size. My findings support the prediction that, while body size is condition-dependent, the sword is not. I show a trend toward hybrid populations displaying increased phenotypic variance and reduced phenotypic integration in sexual ornaments and body size. These findings provide evidence for a potential answer to a central question in the study of sexual selection, that of reduced genetic and phenotypic variance in sexual ornaments as the result of persistent direction selection generated by female choice. I take advantage of reduced phenotypic integration in hybrids allowing the evaluation of locomotor performance across a broad range of multivariate trait values. Sexual ornaments did not impair swimming performance per se. Rather, the sword negatively affected performance only when paired with a sub-optimal body shape. I evaluated how natural hybridization changes the relationship between boldness and anti-predator response. In poeciliid fishes, bold individuals have increased survival in the presence of predators. This non-intuitive observation may result from bold individuals being more likely to engage in anti-predator behaviors. Counter to my prediction, bold individuals were less likely to perform a fast-start response to a predator threat. This correlation was consistent among populations and species but was only significant in hybrids. My findings suggest that hybridization could influence correlations between behavioral traits in a manner similar to that documented for morphological traits.
Advisors/Committee Members: Rosenthal, Gil G (advisor), Jones, Adam G (committee member), Winemiller, Kirk O (committee member), Fitzgerald, Lee A (committee member).
Subjects/Keywords: sexual selection; morphology; hybridization; fish
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APA (6th Edition):
Johnson, J. B. (2013). The Architecture of Phenotypes in a Naturally Hybridizing Complex of Xiphophorus Fishes. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/149426
Chicago Manual of Style (16th Edition):
Johnson, James Bradley. “The Architecture of Phenotypes in a Naturally Hybridizing Complex of Xiphophorus Fishes.” 2013. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/149426.
MLA Handbook (7th Edition):
Johnson, James Bradley. “The Architecture of Phenotypes in a Naturally Hybridizing Complex of Xiphophorus Fishes.” 2013. Web. 28 Feb 2021.
Vancouver:
Johnson JB. The Architecture of Phenotypes in a Naturally Hybridizing Complex of Xiphophorus Fishes. [Internet] [Doctoral dissertation]. Texas A&M University; 2013. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/149426.
Council of Science Editors:
Johnson JB. The Architecture of Phenotypes in a Naturally Hybridizing Complex of Xiphophorus Fishes. [Doctoral Dissertation]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/149426
18.
Ratterman, Nicholas 1981-.
The Quantitative Genetics of Mate Choice Evolution: Theory and Empiricism.
Degree: PhD, Zoology, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/148386
► The evolution of mate choice remains one of the most controversial topics within evolutionary biology. In particular, the coevolutionary dynamics between ornaments and mating preferences…
(more)
▼ The evolution of mate choice remains one of the most controversial topics within evolutionary biology. In particular, the coevolutionary dynamics between ornaments and mating preferences has been extensively studied, but few generalizations have emerged. From a theoretical standpoint, the nature of the genetic covariance built up by the process of mate choice has received considerable attention, though the models still make biologically unrealistic assumptions. Empirically, the difficulty of estimating parameters in the models has hindered our ability to understand what processes are occurring in nature. Thus, it is the goal of this dissertation to contribute to the field both theoretically and empirically.
I begin with a review of the evolution of mate choice and demonstrate how the lack of cross-talk between theoretical and empirical pursuits into studying mate choice has constrained our ability to extract basic principles. The review is followed by a new model of intersexual selection that relaxes some of the critical assumptions inherent in sexual selection theory. There are two empirical studies whose goal is to measure mating preference functions and genetic correlations in a way that can be related back to theory. Finally, I conclude by setting the stage for future endeavors into exploring the evolution of mate choice.
The results presented herein demonstrate four things: (i) a lack of communication between theoretical and empirical studies of mate choice; (ii) genetic drift plays a much larger role in preference evolution than previously demonstrated; (iii) genetic correlations other than those explicitly modeled are likely to be important in preference evolution; and (iv) variation in mating preferences can eliminate intersexual selection altogether. From these four findings it can be concluded that a tighter link between theory and empiricism is needed, with a particular emphasis on the importance of measuring individual-level preference functions. Models will benefit from integrating the specific phenotypes measured by empiricists. Experimentation will be more useful to theory if particular attention is paid to the exact phenotypes that are measured. Overall, this dissertation is a stepping stone for a more cohesive and accurate understanding of mate choice evolution.
Advisors/Committee Members: Jones, Adam G (advisor), Rosenthal, Gil G (advisor), Carney, Ginger E (committee member), Fitzgerald, Lee (committee member).
Subjects/Keywords: quantitative genetics; preference; sexual selection; Mate choice
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APA (6th Edition):
Ratterman, N. 1. (2012). The Quantitative Genetics of Mate Choice Evolution: Theory and Empiricism. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148386
Chicago Manual of Style (16th Edition):
Ratterman, Nicholas 1981-. “The Quantitative Genetics of Mate Choice Evolution: Theory and Empiricism.” 2012. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/148386.
MLA Handbook (7th Edition):
Ratterman, Nicholas 1981-. “The Quantitative Genetics of Mate Choice Evolution: Theory and Empiricism.” 2012. Web. 28 Feb 2021.
Vancouver:
Ratterman N1. The Quantitative Genetics of Mate Choice Evolution: Theory and Empiricism. [Internet] [Doctoral dissertation]. Texas A&M University; 2012. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/148386.
Council of Science Editors:
Ratterman N1. The Quantitative Genetics of Mate Choice Evolution: Theory and Empiricism. [Doctoral Dissertation]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148386
19.
Subalusky, Amanda Lee.
The role of seasonal wetlands in the ecology of the American alligator.
Degree: MS, Wildlife and Fisheries Sciences, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1640
► The American alligator (Alligator mississippiensis) has been frequently studied in large reservoirs and coastal marshes. Large ontogenetic shifts in their diet and morphology have been…
(more)
▼ The American alligator (Alligator mississippiensis) has been frequently studied in large reservoirs and coastal marshes. Large ontogenetic shifts in their diet and morphology have been linked with changes in habitat use, with adult males using deep, open water and juveniles and nesting females relying on vegetated marsh. In certain regions of the inland portion of the alligator’s range, these different aquatic habitats are represented by seasonal wetlands and riverine systems that are separated by a terrestrial matrix. Ontogenetic habitat shifts, therefore, would require overland movements between systems, which has important implications for conservation of the species. I tested several commonly used methods of surveying alligator populations to determine the most effective method of studying alligators in seasonal wetlands. I then used systematic trapping, nest surveys and radio telemetry to determine habitat use and overland movement rates by different sex and size classes. I found that seasonal wetlands provided nesting and nursery sites for these inland alligator populations, but that both juveniles undergoing an ontogenetic shift and nesting females move between the wetlands and riverine systems. Overland movements by alligators between the wetland and riverine habitats establish a level of functional connectivity between these aquatic ecosystems. I constructed a habitat suitability index of both the wetlands and the surrounding landscape to determine which patch and landscape characteristics were important to wetland use by alligators. I found that both descriptive wetland characteristics and the spatial relationships between wetlands were important predictors of alligator use. Overland movement was related to upland landuse as well as distance between aquatic habitats. Conserving a variety of wetland sizes and types within an intact upland matrix is critical to maintaining connectivity across the landscape. Furthermore, understanding how species may act as mobile links between ecosystems, particularly those with ontogenetic niche shifts, illustrates the importance of approaching conservation from a landscape perspective.
Advisors/Committee Members: Fitzgerald, Lee A. (advisor), Smith, Lora L. (advisor), Winemiller, Kirk O. (committee member), Wu, X. Ben (committee member).
Subjects/Keywords: seasonal wetlands; American alligator; double-observer survey; ontogenetic niche shift; functional connectivity; habitat suitability model
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APA (6th Edition):
Subalusky, A. L. (2009). The role of seasonal wetlands in the ecology of the American alligator. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1640
Chicago Manual of Style (16th Edition):
Subalusky, Amanda Lee. “The role of seasonal wetlands in the ecology of the American alligator.” 2009. Masters Thesis, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-1640.
MLA Handbook (7th Edition):
Subalusky, Amanda Lee. “The role of seasonal wetlands in the ecology of the American alligator.” 2009. Web. 28 Feb 2021.
Vancouver:
Subalusky AL. The role of seasonal wetlands in the ecology of the American alligator. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1640.
Council of Science Editors:
Subalusky AL. The role of seasonal wetlands in the ecology of the American alligator. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1640
20.
Miller, Carrie J.
Factors influencing algal biomass in hydrologically dynamic salt ponds in a subtropical salt marsh.
Degree: MS, Wildlife and Fisheries Sciences, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1392
► The interface between land and water is often a dynamic zone that responds to relatively short-term climatic and hydrologic forces. Coastal salt marshes occupy this…
(more)
▼ The interface between land and water is often a dynamic zone that responds to
relatively short-term climatic and hydrologic forces. Coastal salt marshes occupy this
zone between land and sea and typically are comprised of vegetated marsh intersected by
channels and shallow ponds that are subject to flooding by winds, tides, and storm
surges. Coastal salt marshes are widely regarded as zones of high macrophyte
productivity. However, microalgae may contribute more to salt marsh productivity than
previously realized, underscoring the importance of understanding algal dynamics in
such systems. Benthic and planktonic chlorophyll-a (surrogate for total algal biomass),
sediment AFDW, total suspended solids, salinity, and nutrients were examined in marsh
ponds in the subtropical Guadalupe Estuary, TX, USA to determine the effects of
hydrologic connections on algal biomass in this system. From May 2005 – May 2006
there were several pond connection, disconnection, and desiccation events. During
periods of disconnection, algal biomass was higher in both the benthos and the water
column than during connection events when supposed flushing occurred. Connection
events also flushed out high NH4 accumulating in pond surface waters, but did not increase NOx. Therefore, the primary source of DIN seemed to be nutrient cycling
within the ponds. There was a temporal effect on surface water salinity, which increased
throughout the sampling period as bay water levels and subsequent pond connections
decreased, demonstrating interannual variability and the link between seasons (wet vs.
dry) and marsh inundation patterns (high water periods vs. low water periods) in this
estuary.
Advisors/Committee Members: Davis, Stephen E. (advisor), Roelke, Daniel L. (advisor), Feagin, Russell A. (committee member), Fitzgerald, Lee A. (committee member).
Subjects/Keywords: algae; hydrodynamics
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APA (6th Edition):
Miller, C. J. (2009). Factors influencing algal biomass in hydrologically dynamic salt ponds in a subtropical salt marsh. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1392
Chicago Manual of Style (16th Edition):
Miller, Carrie J. “Factors influencing algal biomass in hydrologically dynamic salt ponds in a subtropical salt marsh.” 2009. Masters Thesis, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-1392.
MLA Handbook (7th Edition):
Miller, Carrie J. “Factors influencing algal biomass in hydrologically dynamic salt ponds in a subtropical salt marsh.” 2009. Web. 28 Feb 2021.
Vancouver:
Miller CJ. Factors influencing algal biomass in hydrologically dynamic salt ponds in a subtropical salt marsh. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1392.
Council of Science Editors:
Miller CJ. Factors influencing algal biomass in hydrologically dynamic salt ponds in a subtropical salt marsh. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1392
21.
Walkup, Danielle Kathryn.
Identifying Disruptions of Population Processes in Fragmented Landscapes for an Endemic Habitat Specialist, the Dunes Sagebrush Lizard (Sceloporus Arenicolus).
Degree: PhD, Wildlife and Fisheries Sciences, 2018, Texas A&M University
URL: http://hdl.handle.net/1969.1/174306
► Habitat fragmentation and habitat loss are two of the main drivers of biodiversity loss. This anthropogenic reduction of habitat and the corresponding increasing isolation can…
(more)
▼ Habitat fragmentation and habitat loss are two of the main drivers of biodiversity
loss. This anthropogenic reduction of habitat and the corresponding increasing isolation
can lead to negative consequences for biodiversity including species loss, changes in
community composition, and reduced species diversity at multiple levels of organization.
Understanding how a species is distributed across the landscape is especially important in
conservation contexts, as variations in habitat quality can drive population persistence. My
dissertation focused on Sceloporus arenicolus (dunes sagebrush lizard) a habitat specialist
endemic to the Mescalero Monahans Sandhills ecosystem threatened by loss and
degradation of shinnery oak dunes. Extensive development of well-pad and road networks
has led to fragmentation of shinnery oak dunes, negatively impacting S. arenciolus
populations. I utilized data from three different studies to elucidate responses of S.
arenicolus populations in highly fragmented areas, understanding how S. arenicolus use
and move through habitat, and finally estimating occupancy probabilities across part of its
Texas range.
To understand how populations of S. arenicolus and other dune-dwelling lizards in
the community were impacted by landscape fragmentation, we captured lizards on 27
independent trapping grids located in unfragmented (N=18) and fragmented (N=9) sites in
southeastern New Mexico from 2009 to 2013. Using a two-way ANOVA, we tested for
effects of fragmentation and year on capture rates for each species. Capture rates of S.
arenicolus decreased to zero in all fragmented sites. Before extirpation, the demographic
structure of S. arenicolus and Holbrookia maculata (common lesser earless lizard), were
severely disrupted at fragmented sites, with proportions of juveniles, adult males or adult
females being over or under represented during sample months. To understand patterns in
use, settlement, and vacancy at both the microhabitat and landscape scales at two different
sites, we trapped S. arenicolus at two different trapping sites (~14 ha each). For each site
individually, we modeled use, settlement, vacancy, and detection as functions of
microhabitat and landscape variables in separate analyses. I showed that microhabitat and
landscape context influence use, settlement, and vacancy patterns in complex ways; these
patterns were dynamic and no single variable consistently predicted the dynamics among
the patterns. Microhabitat variables better predicted the probability of use, while
landscape-scale variables better predicted probabilities of settlement and vacancy.
Finally, to gain a baseline understanding of occupancy in parts of the range of S.
arenicolus in
Texas using the range map from the
Texas Conservation Plan, 100 16-ha
sites were surveyed multiple times (336 surveys total) from May to August 2014–2016.
Thirty-three S. arenicolus were detected during 17 surveys at nine sites in areas classified
as Very High likelihood of occurrence. Occupancy probability…
Advisors/Committee Members: Fitzgerald, Lee A (advisor), Hibbitts, Toby J (advisor), Fujiwara, Masami (committee member), Walton, Jay (committee member), Ryberg, Wade A (committee member).
Subjects/Keywords: Sceloporus arenicolus; population ecology; fragmentation; oil and gas development; occupancy
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APA (6th Edition):
Walkup, D. K. (2018). Identifying Disruptions of Population Processes in Fragmented Landscapes for an Endemic Habitat Specialist, the Dunes Sagebrush Lizard (Sceloporus Arenicolus). (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/174306
Chicago Manual of Style (16th Edition):
Walkup, Danielle Kathryn. “Identifying Disruptions of Population Processes in Fragmented Landscapes for an Endemic Habitat Specialist, the Dunes Sagebrush Lizard (Sceloporus Arenicolus).” 2018. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/174306.
MLA Handbook (7th Edition):
Walkup, Danielle Kathryn. “Identifying Disruptions of Population Processes in Fragmented Landscapes for an Endemic Habitat Specialist, the Dunes Sagebrush Lizard (Sceloporus Arenicolus).” 2018. Web. 28 Feb 2021.
Vancouver:
Walkup DK. Identifying Disruptions of Population Processes in Fragmented Landscapes for an Endemic Habitat Specialist, the Dunes Sagebrush Lizard (Sceloporus Arenicolus). [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/174306.
Council of Science Editors:
Walkup DK. Identifying Disruptions of Population Processes in Fragmented Landscapes for an Endemic Habitat Specialist, the Dunes Sagebrush Lizard (Sceloporus Arenicolus). [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/174306
22.
Mbaiwa, Joseph Elizeri.
Tourism development, rural livelihoods, and conservation in the Okavango Delta, Botswana.
Degree: PhD, Recreation, Park, and Tourism Sciences, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-3064
► This study analyzed changes in livelihoods before and after tourism development at Khwai, Mababe and Sankoyo villages in the Okavango Delta. Specifically, it analyzed how…
(more)
▼ This study analyzed changes in livelihoods before and after tourism development
at Khwai, Mababe and Sankoyo villages in the Okavango Delta. Specifically, it analyzed
how people interacted with species like giraffe (Giraffa camelopardalis), sable antelope
(Hippotragus niger) and thatching grass (Cymbopogon excavatus) before and after
tourism development. This analysis was expected to measure the effectiveness of
tourism development as a tool to improve livelihoods and conservation. The concept of
social capital, sustainable livelihoods framework and the Community- Based Natural
Resource Management (CBNRM) paradigm informed the study. Qualitative and
quantitative data were gathered through field-based research, using tools of participant
observation, semi-structured interviews, and key informant interviews. Results indicate
that local customs and institutions at Khwai, Mababe and Sankoyo ensured the
conservation of resources in pre-colonial Botswana. However, British colonial rule
(1885-1966) affected traditional institutions of resource use hence the beginning of
resource decline. The British colonial rule and the first 15-20 years after Botswana’s independence from British rule saw an increase in resource degradation. Results also
indicate that since CBNRM began in the 1990s, tourism development has positive and
negative effects on rural livelihoods. On the positive side, tourism development in some
ways is achieving its goals of improved livelihoods and conservation. Residents’
attitudes towards tourism development and conservation have also become positive
compared to a decade ago when these communities were not involved in tourism
development. On the negative side, tourism is emerging as the single livelihood option
causing either a decline or abandonment of traditional options like hunting and gathering
and agricultural production. Reliance on tourism alone as a livelihood option is risky in
the event of a global social, economic and political instability especially in countries
where most tourists that visit the Okavango originate or in Botswana itself. There is
need, therefore, for communities to diversify into domestic tourism and small-scale
enterprises. On the overall, tourism development through CBNRM indicates that it is a
viable tool to achieve improved livelihoods and conservation in the Okavango Delta.
Advisors/Committee Members: Stronza, Amanda L. (advisor), Albtrecht, Donald E (committee member), Fitzgerald, Lee A (committee member), Jamal, Tazim B (committee member), Kreuter, Urs P (committee member).
Subjects/Keywords: tourism development; rural livelihoods; conservation; Okavango Delta; Botswana
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Manager
APA (6th Edition):
Mbaiwa, J. E. (2009). Tourism development, rural livelihoods, and conservation in the Okavango Delta, Botswana. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-3064
Chicago Manual of Style (16th Edition):
Mbaiwa, Joseph Elizeri. “Tourism development, rural livelihoods, and conservation in the Okavango Delta, Botswana.” 2009. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-3064.
MLA Handbook (7th Edition):
Mbaiwa, Joseph Elizeri. “Tourism development, rural livelihoods, and conservation in the Okavango Delta, Botswana.” 2009. Web. 28 Feb 2021.
Vancouver:
Mbaiwa JE. Tourism development, rural livelihoods, and conservation in the Okavango Delta, Botswana. [Internet] [Doctoral dissertation]. Texas A&M University; 2009. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3064.
Council of Science Editors:
Mbaiwa JE. Tourism development, rural livelihoods, and conservation in the Okavango Delta, Botswana. [Doctoral Dissertation]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3064
Texas A&M University
23.
Smolensky, Nicole Limunga.
Population enumeration and the effects of oil and gas development on dune-dwelling lizards.
Degree: MS, Wildlife and Fisheries Sciences, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2848
► Habitat loss is one of the leading causes of species decline across all taxa and conservation practices require information on population trends. The Mescalero Sands…
(more)
▼ Habitat loss is one of the leading causes of species decline across all taxa and conservation practices require information on population trends. The Mescalero Sands ecosystem, New Mexico, USA, is experiencing landscape changes associated with oil and gas development. The dune-dwelling lizard community contains a habitat specialist, Sceloporus arenicolus, that is of particular interest because it has a very limited geographic distribution that is entirely subject to oil and gas development. Distance sampling is widely used to estimate population densities of many vertebrate taxa however assumptions can be difficult to satisfy with certain species or in certain habitats. Researchers must investigate the likelihood that assumptions can be satisfied before implementing any population sampling method. I had two objectives. First to investigate the precision of population densities of dune-dwelling lizards estimated via distance sampling that was coupled with double-observer surveys. Second to compare abundances of dune-dwelling lizards among sites that varied in oil and gas development. I conducted distance line transects and compared those density estimates to densities obtained from total removal plots. I quantified the amount of oil and gas development, habitat quantity and quality and correlated those to lizard abundances to investigate the effects of oil and gas development on lizard populations. I found large differences in density estimates from distance sampling and total removal plots that resulted from violation of distance sampling assumptions. Although distance sampling is a low cost method, it does not produce reliable density estimates for dune-dwelling lizards and is not an appropriate sampling method in this system. I did not find oil and gas development effects on the habitat quantity, quality or on the abundances of lizards. Lizard abundances were most strongly correlated to habitat quantity. Lizard abundances may be influenced by complex interactions between oil and gas development and habitat quantity and quality but controlling for those interactions was beyond the scope of my study. Before and after experiments and long-term studies at multiple sites would be required to more fully address the effects of oil and gas development on lizard populations in the Mescalero Sands.
Advisors/Committee Members: Fitzgerald, Lee A. (advisor), Bowser, Gillian (committee member), Kreuter, Urs (committee member), Winemiller, Kirk (committee member).
Subjects/Keywords: distance sampling; anthropogenic effects on lizards
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APA (6th Edition):
Smolensky, N. L. (2009). Population enumeration and the effects of oil and gas development on dune-dwelling lizards. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2848
Chicago Manual of Style (16th Edition):
Smolensky, Nicole Limunga. “Population enumeration and the effects of oil and gas development on dune-dwelling lizards.” 2009. Masters Thesis, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2848.
MLA Handbook (7th Edition):
Smolensky, Nicole Limunga. “Population enumeration and the effects of oil and gas development on dune-dwelling lizards.” 2009. Web. 28 Feb 2021.
Vancouver:
Smolensky NL. Population enumeration and the effects of oil and gas development on dune-dwelling lizards. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2848.
Council of Science Editors:
Smolensky NL. Population enumeration and the effects of oil and gas development on dune-dwelling lizards. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2848
Texas A&M University
24.
Murray, Rebecca Ann.
Endohelminths from six rare species of turtles (Bataguridae) from Southeast Asia confiscated by international authorities in Hong Kong, China.
Degree: MS, Wildlife and Fisheries Sciences, 2004, Texas A&M University
URL: http://hdl.handle.net/1969.1/193
► Specimens of 6 species of threatened, vulnerable, and endangered turtles (Cuora amboinensis, Cyclemys dentata, Heosemys grandis, Orlitia borneensis, Pyxidea mouhotii, and Siebenrockiella crassicollis) belonging to…
(more)
▼ Specimens of 6 species of threatened, vulnerable, and endangered turtles (Cuora amboinensis, Cyclemys dentata, Heosemys grandis, Orlitia borneensis, Pyxidea mouhotii, and Siebenrockiella crassicollis) belonging to family Bataguridae, were confiscated in Hong Kong, China on 11 December 2001 by international authorities. Endohelminth studies on these turtle species are scarce, and this study provided a rare opportunity to examine a limited number of specimens for endohelminths. Ten different parasite species were collected and there were 16 new host records. This is the first record of a parasite from P. mouhotii. The parasite prevalences found in this study provide a basis for a better understanding of the phylogenetic relationships of the family Bataguridae to other families, especially Testudinidae. Based on known life cycles, parasites found provided an indication of food preferences of these 6 turtle species that support previous studies of the turtles' feeding habits. However, the results of the parasite survey from O. borneensis provided additional feeding habit information. The list of endohelminths herein is intended to provide a foundation for future parasite studies of the 6 species of Asian turtles.
Advisors/Committee Members: Dronen, Norman, Jr. (advisor), Fitzgerald, Lee (committee member), Sweet, Merrill (committee member).
Subjects/Keywords: Hong Kong; China; Confiscation; Bataguridae; Testudinidae; Turtle; Parasite; Phylogeny; Food habits; Biodiversity; Disease; Burma; Thailand; Vietnam; Sumatra; Borneo; Malaysia Cestoda; Trematoda; Nematoda; Spirorchidae; Aspidogastrea; Digenea; Cuora amboinensis; Cyclemys dentata; Heosemys grandis; Orlitia borneensis; Pyxidea mouhotii; Siebenrockiella crassicollis; Manouria emys; Manouria impressa; Falcaustra duyagi; Falcaustra greineri; Serpinema octorugatum; Diaschistorchis multitesticularis; Multicotyle purvisi; Telorchis clemmydis; Stunkardia dilymphosa
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APA (6th Edition):
Murray, R. A. (2004). Endohelminths from six rare species of turtles (Bataguridae) from Southeast Asia confiscated by international authorities in Hong Kong, China. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/193
Chicago Manual of Style (16th Edition):
Murray, Rebecca Ann. “Endohelminths from six rare species of turtles (Bataguridae) from Southeast Asia confiscated by international authorities in Hong Kong, China.” 2004. Masters Thesis, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/193.
MLA Handbook (7th Edition):
Murray, Rebecca Ann. “Endohelminths from six rare species of turtles (Bataguridae) from Southeast Asia confiscated by international authorities in Hong Kong, China.” 2004. Web. 28 Feb 2021.
Vancouver:
Murray RA. Endohelminths from six rare species of turtles (Bataguridae) from Southeast Asia confiscated by international authorities in Hong Kong, China. [Internet] [Masters thesis]. Texas A&M University; 2004. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/193.
Council of Science Editors:
Murray RA. Endohelminths from six rare species of turtles (Bataguridae) from Southeast Asia confiscated by international authorities in Hong Kong, China. [Masters Thesis]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/193
Texas A&M University
25.
Crawford, Jared Louis.
Seasonal variation in thyroxine in the American alligator (Alligator mississippiensis).
Degree: MS, Zoology, 2004, Texas A&M University
URL: http://hdl.handle.net/1969.1/303
► Male and female alligators ranging from 58 cm to 361 cm in length (N=1054) were captured and their blood was sampled between 9 A.M. and…
(more)
▼ Male and female alligators ranging from 58 cm to 361 cm in length (N=1054) were captured and their blood was sampled between 9 A.
M. and midnight from June 2000 - June 2002 at the Rockefeller Wildlife Refuge in Grand Chenier, LA. Animals were captured in a variety of habitats including marsh, open water, canals, and ponds. Total thyroid hormones were measured by radioimmunoassay. Four criteria were used to evaluate changes in hormone levels: sex, total length, season, and time of day. Thyroxine (T4) varied over a wide range from 0.5 to 57 ng/mL. Triiodothyronine (T3) levels were below the sensitivity of the assay (<0.6ng/mL). A distinct seasonal peak in T4 was observed between December and April, peaking in March with highest mean T4 levels observed in the spring. Mean T4 declined significantly from the spring to an intermediate summer mean and declined significantly again in the winter. No T4 differences between the sexes were observed. Mean T4 was highest in juveniles, significantly lower in subadults, and significantly lower still in adults. Highest levels were found between 5 P.
M. and midnight. With values up to 57 ng/ml in the spring, alligators exhibit T4 levels among the highest recorded for reptiles.
Advisors/Committee Members: MacKenzie, Duncan S. (advisor), Fitzgerald, Lee A. (committee member), Scott, Timothy P. (committee member).
Subjects/Keywords: alligator; seasonal; thyroxine
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APA (6th Edition):
Crawford, J. L. (2004). Seasonal variation in thyroxine in the American alligator (Alligator mississippiensis). (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/303
Chicago Manual of Style (16th Edition):
Crawford, Jared Louis. “Seasonal variation in thyroxine in the American alligator (Alligator mississippiensis).” 2004. Masters Thesis, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/303.
MLA Handbook (7th Edition):
Crawford, Jared Louis. “Seasonal variation in thyroxine in the American alligator (Alligator mississippiensis).” 2004. Web. 28 Feb 2021.
Vancouver:
Crawford JL. Seasonal variation in thyroxine in the American alligator (Alligator mississippiensis). [Internet] [Masters thesis]. Texas A&M University; 2004. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/303.
Council of Science Editors:
Crawford JL. Seasonal variation in thyroxine in the American alligator (Alligator mississippiensis). [Masters Thesis]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/303
Texas A&M University
26.
Harlin, April Dawn.
Molecular systematics and phylogeography of the dusky dolphin (Lagenorhynchus obscurus) derived from nuclear and mitochondrial loci.
Degree: PhD, Wildlife and Fisheries Sciences, 2006, Texas A&M University
URL: http://hdl.handle.net/1969.1/3186
► This study presents evidence from mitochondrial and nuclear loci that there is genetic divergence among and within geographic populations of Lagenorhynchus obscurus. The effect of…
(more)
▼ This study presents evidence from mitochondrial and nuclear loci that there is
genetic divergence among and within geographic populations of Lagenorhynchus
obscurus. The effect of seasonal variation on the genetic structure within New Zealand
was examined with mitochondrial DNA control region sequences from 4 localities.
Analysis of nested haplotype clades indicated genetic fragmentation and at least 1
historical population expansion within New Zealand. AMOVA and Fst values from
nuclear and mitochondrial DNA sequences suggested significant divergence between
New Zealand, South Africa, Argentina, and Peru. Dispersal via the west-wind drift was
not supported by patterns of population structure among regions. Alternatively, these
data support reciprocal exchange among all four regions with 100% posterior probability
for a root of origin in the Indian/Atlantic Oceans. The degree of divergence between
Peru and other regions indicates the isolation of Peruvian stock is temporally correlated
with the constriction of DrakeÂs passage in the Plio-Pleistocene. There is evidence that
the Plio-Pliestocene paleoceanography of the Indian and Southern Atlantic Oceans
influenced phylogeography with shifts of temperate sea surface temperatures northward
~5º of latitude, disrupting the dispersal corridor between New Zealand and Atlantic
populations. A preference for temperate waters along continental shelves is proposed as
an explanation for lack of contemporary genetic exchange among regions. This study
supports the polyphyly of the genus Lagenorhynchus. North Atlantic species form a
monophyletic Lagenorhynchus. In the Southern Hemisphere, L. australis/L. cruciger
and L. obliquidens/L. obscurus do not form a monophyletic group. I discuss the
taxonomic implications and propose taxonomic revision of the genus based on these
results. Measures of character interaction indicate that combined evidence from nuclear
and mitochondrial genes provide better phylogenetic resolution among delphinid
lineages than any data partition independently, despite some indications of conflict
among mitochondrial and nuclear data.
Advisors/Committee Members: Wursig, Bernd (advisor), Honeycutt, Rodney L. (advisor), Woolley, Jim (committee member), Fitzgerald, Lee (committee member).
Subjects/Keywords: nuclear gene phylogeography; dolphin systematics; data interaction; population structure; dusky dolphin; Lagenorhynchus obscurus; west-wind drift
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APA (6th Edition):
Harlin, A. D. (2006). Molecular systematics and phylogeography of the dusky dolphin (Lagenorhynchus obscurus) derived from nuclear and mitochondrial loci. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/3186
Chicago Manual of Style (16th Edition):
Harlin, April Dawn. “Molecular systematics and phylogeography of the dusky dolphin (Lagenorhynchus obscurus) derived from nuclear and mitochondrial loci.” 2006. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/3186.
MLA Handbook (7th Edition):
Harlin, April Dawn. “Molecular systematics and phylogeography of the dusky dolphin (Lagenorhynchus obscurus) derived from nuclear and mitochondrial loci.” 2006. Web. 28 Feb 2021.
Vancouver:
Harlin AD. Molecular systematics and phylogeography of the dusky dolphin (Lagenorhynchus obscurus) derived from nuclear and mitochondrial loci. [Internet] [Doctoral dissertation]. Texas A&M University; 2006. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/3186.
Council of Science Editors:
Harlin AD. Molecular systematics and phylogeography of the dusky dolphin (Lagenorhynchus obscurus) derived from nuclear and mitochondrial loci. [Doctoral Dissertation]. Texas A&M University; 2006. Available from: http://hdl.handle.net/1969.1/3186
Texas A&M University
27.
Garza, Mark Isaac.
Predator induced defenses in prey with diverse predators.
Degree: MS, Wildlife and Fisheries Sciences, 2006, Texas A&M University
URL: http://hdl.handle.net/1969.1/3309
► Phenotypic plasticity is an environmentally based change in phenotype and can be adaptive. Often, the change in an organism's phenotype is induced by the presence…
(more)
▼ Phenotypic plasticity is an environmentally based change in phenotype and can be
adaptive. Often, the change in an organism's phenotype is induced by the presence of a
predator and serves as a defense against that predator. Defensive phenotypes are induced
in freshwater physid snails in response to both crayfish and molluscivorous fish.
Alternative morphologies are produced depending on which of these two predators snails
are raised with, thus protecting them from each of these predators' unique mode of
predation. Snails and other mollusks have been shown to produce thicker, differently
shaped shells when found with predators relative to those found without predators. This
production of thicker, differently shaped shells offers better protection against predators
because of increased predator resistance.
The first study in this thesis explores costs and limits to plasticity using the snailfish-
crayfish system. I exposed juvenile physid snails (using a family structure) to either
early or late shifts in predation regimes to assess whether developmental flexibility is
equally possible early and late in development. Physid snails were observed to produce
alternative defensive morphologies when raised in the presence of each of the two
predators. All families responded similarly to the environment in which they were raised.
Morphology was found to be heritable, but plasticity itself was not heritable. Morphology was found to become less flexible as snails progressed along their respective
developmental pathways.
In the second study, I raised physid snails with and without shell-crushing sunfish
and examined the differences in shell thickness, shell mass, shell size and shell
microstructural properties between the two treatment groups. Shells of snails raised with
predators were found to be larger, thicker and more massive than those raised without
predators, but differences in microstructure were found to be insignificant. I conclude that
the observed shell thickening is accomplished by the snails' depositing more of the same
material into their shells and not by producing a more complex shell composition.
Advisors/Committee Members: DeWitt, Thomas J. (advisor), Coganto, Anthony I. (committee member), Fitzgerald, Lee (committee member).
Subjects/Keywords: inducible defenses; shell morphology; Physa; Lepomis microlophus; morphometrics
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APA (6th Edition):
Garza, M. I. (2006). Predator induced defenses in prey with diverse predators. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/3309
Chicago Manual of Style (16th Edition):
Garza, Mark Isaac. “Predator induced defenses in prey with diverse predators.” 2006. Masters Thesis, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/3309.
MLA Handbook (7th Edition):
Garza, Mark Isaac. “Predator induced defenses in prey with diverse predators.” 2006. Web. 28 Feb 2021.
Vancouver:
Garza MI. Predator induced defenses in prey with diverse predators. [Internet] [Masters thesis]. Texas A&M University; 2006. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/3309.
Council of Science Editors:
Garza MI. Predator induced defenses in prey with diverse predators. [Masters Thesis]. Texas A&M University; 2006. Available from: http://hdl.handle.net/1969.1/3309
Texas A&M University
28.
Treglia, Michael Louis.
A Translocated Population of the St. Croix Ground Lizard: Analyzing Its Detection Probability and Investigating its Impacts on the Local Prey Base.
Degree: MS, Wildlife and Fisheries Sciences, 2010, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8234
► The St. Croix ground lizard, Ameiva polops, is a United States endangered species endemic to St. Croix, U.S. Virgin Islands. It was extirpated from St.…
(more)
▼ The St. Croix ground lizard, Ameiva polops, is a United States endangered species endemic to St. Croix, U.S. Virgin Islands. It was extirpated from St. Croix Proper by invasive mongooses, and remaining populations are on small, nearby cays. In the summer of 2008, as part of the recovery plan for this species, I worked in a multi-agency effort to translocate a population of A. polops to Buck Island Reef National Monument, U.S. Virgin Islands to focus on two main objectives: 1) examine the detection probability of A. polops and infer the consequences of it on population estimates; and 2) examine whether A. polops may deplete its prey base or alter the arthropod assemblage at the translocation site. We used a soft-release strategy for the translocation, in which 57 lizards were initially contained in a series of eight 10
m x 10
m enclosures in the habitat on Buck Island for monitoring. As part of the initial monitoring I conducted visual surveys through all enclosures, with the known number of lizards, to calculate the detection probability and to demonstrate how many individuals would be estimated using visual encounter surveys of this known population. Adjacent to enclosures housing A. polops were control enclosures, without A. polops, which I used to test whether the translocated lizards would impact their prey base over 6 weeks. I found that the detection probability of A. polops is very low (<0.25), which causes population sizes to be severely underestimated, even using some mark-resight techniques. My study of A. polops on the prey community indicated that the lizards generally had no effect on abundance or diversity of arthropods in general, though they may cause small changes for particular taxa. My results help corroborate other evidence that accuracy of population enumeration techniques needs to be improved in order to adequately understand the status of wildlife populations. Additionally, prey resources do not seem to be limiting A. polops in the short-term, and I expect the population will grow, expanding through Buck Island. Future monitoring will be carried out by the National Park Service using robust mark-resight techniques.
Advisors/Committee Members: Fitzgerald, Lee A. (advisor), Winemiller, Kirk O. (committee member), Rosenthal, Gil (committee member).
Subjects/Keywords: Ameiva polops; St. Croix Ground Lizard; translocation; detection probability; population estimation; prey limitation; prey base
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APA (6th Edition):
Treglia, M. L. (2010). A Translocated Population of the St. Croix Ground Lizard: Analyzing Its Detection Probability and Investigating its Impacts on the Local Prey Base. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8234
Chicago Manual of Style (16th Edition):
Treglia, Michael Louis. “A Translocated Population of the St. Croix Ground Lizard: Analyzing Its Detection Probability and Investigating its Impacts on the Local Prey Base.” 2010. Masters Thesis, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8234.
MLA Handbook (7th Edition):
Treglia, Michael Louis. “A Translocated Population of the St. Croix Ground Lizard: Analyzing Its Detection Probability and Investigating its Impacts on the Local Prey Base.” 2010. Web. 28 Feb 2021.
Vancouver:
Treglia ML. A Translocated Population of the St. Croix Ground Lizard: Analyzing Its Detection Probability and Investigating its Impacts on the Local Prey Base. [Internet] [Masters thesis]. Texas A&M University; 2010. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8234.
Council of Science Editors:
Treglia ML. A Translocated Population of the St. Croix Ground Lizard: Analyzing Its Detection Probability and Investigating its Impacts on the Local Prey Base. [Masters Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8234
Texas A&M University
29.
Laurencio, David Edelman.
Environmental correlates to amphibian and reptile diversity in Costa Rica.
Degree: MS, Wildlife and Fisheries Sciences, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1675
► The study of species diversity patterns and their causes remains a central theme of ecology. Work conducted over the last few decades has shown that…
(more)
▼ The study of species diversity patterns and their causes remains a central theme
of ecology. Work conducted over the last few decades has shown that both historical
and ecological factors are important in determining species diversity patterns.
Additionally, different causal mechanisms are important at different spatial and temporal
scales. At the regional scale, species diversity patterns can best be studied in terms of
three diversity components (alpha, beta and gamma). This study used the amphibians
and reptiles of Costa Rica to examine these species diversity components at the regional
scale. To accomplish this, existing species lists were compiled from the literature.
Additionally, three herpetofaunal surveys were conducted at under surveyed sites to fill
knowledge gaps.
A survey of Parque Nacional Carara, a transitional zone site on Costa Rica’s
central Pacific coast, gave evidence of a rich herpetofauna, containing species from both
the dry tropical forest to the north and the wet lowland forest to the south. Survey
results show that Carara’s herpetofaunal assemblage is more similar to that of the wet
forest than the dry forest, and suggest many species from both assemblages reach their
range limit at or near the park. Surveys of four sites in the eastern Área de Conservación
Guanacaste showed rich herpetofaunal diversity and validated the newly purchased Rincón Rainforest as an important conservation area. A survey of Reserva Natural
Absoluta Cabo Blanco provided a preliminary list of amphibian and reptile species of the
lower Nicoya Peninsula and highlighted the importance of Laguna Balsitas to the local
amphibian fauna. A comparison of amphibian and reptile alpha diversity among 17 sites
throughout Costa Rica showed highest alpha amphibian diversity in the lowland
rainforests of the Pacific versant and highest reptile alpha diversity in lowland
rainforests of the Atlantic versant. An analysis of beta diversity produced dendrograms
showing sites within lowland ecoregions being most similar. A Canonical
Correspondence Analysis (CCA) of environmental variables showed two climate
gradients, an elevation/temperature gradient and a sun/rain gradient, to be important in
determining species diversity patterns for both amphibians and reptiles in Costa Rica.
Advisors/Committee Members: Fitzgerald, Lee A. (advisor), Dixon, James R. (committee member), Wharton, Robert A. (committee member).
Subjects/Keywords: Species diversity; amphibians; reptiles; Costa Rica; Alpha diversity; Beta diversity
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Manager
APA (6th Edition):
Laurencio, D. E. (2009). Environmental correlates to amphibian and reptile diversity in Costa Rica. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1675
Chicago Manual of Style (16th Edition):
Laurencio, David Edelman. “Environmental correlates to amphibian and reptile diversity in Costa Rica.” 2009. Masters Thesis, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-1675.
MLA Handbook (7th Edition):
Laurencio, David Edelman. “Environmental correlates to amphibian and reptile diversity in Costa Rica.” 2009. Web. 28 Feb 2021.
Vancouver:
Laurencio DE. Environmental correlates to amphibian and reptile diversity in Costa Rica. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1675.
Council of Science Editors:
Laurencio DE. Environmental correlates to amphibian and reptile diversity in Costa Rica. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1675
Texas A&M University
30.
Zeug, Steven Christopher.
Demographic and trophic dynamics of fishes in relation to hydrologic variation in channel and floodplain habitats of the Brazos River, Texas.
Degree: PhD, Wildlife and Fisheries Sciences, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1971
► Large rivers in North America have been subjected to a variety of hydrologic alterations that have negatively impacted aquatic fauna. These impacts have triggered restoration…
(more)
▼ Large rivers in North America have been subjected to a variety of hydrologic
alterations that have negatively impacted aquatic fauna. These impacts have triggered
restoration efforts, including management of flows, to restore or maintain ecological
integrity. Ecological data relevant to flow management and habitat restoration is scarce,
and conceptual models of ecosystem function have been widely applied to large rivers
despite a lack of quantitative evaluation of these models. Here, I examine demographic
and trophic dynamics of fishes with divergent life histories and trophic guilds in relation
to habitat heterogeneity and flow variability in a relatively unaltered floodplain system:
the Brazos River,
Texas. Reproductive activity of fishes with three divergent life history
strategies was positively associated with long-term river hydrology, although species
with alternate strategies exploited different portions of the hydrograph (peak flow versus
increasing flow). Despite the positive association with hydrology, low-flow periods
were favorable for recruitment, and food resources for larvae and juveniles were denser
during these periods. Some species used both oxbow and channel habitats during some
point in their life cycle, whereas other species appeared to be almost entirely restricted to
one habitat type. Terrestrial C3 macrophytes accounted for a significant fraction of the biomass of
most consumer species examined. Small-bodied species in oxbow lakes assimilated
large fractions of biomass from benthic algae, whereas this pattern was not observed in
the river channel. Frequent flow variations in the river channel may reduce algal
standing stocks, and significant contributions from autochthonous algal sources may
only occur during low-flow periods. Trophic positions of detritivores indicated that
terrestrial carbon sources were assimilated, for the most part, via invertebrates rather
than by direct consumption. My results indicate that current conceptual models are too
vague to provide accurate predictions for restoration strategies in rivers with variable
flow regimes. Flow and habitat management strategies that focus on reproducing key
features of historical fluvial dynamics are likely to be more successful than strategies
that focus on single indicator species or flow dynamics that differ from the historical
hydrograph.
Advisors/Committee Members: Winemiller, Kirk (advisor), Briske, David (committee member), Davis, Stephen (committee member), Fitzgerald, Lee (committee member).
Subjects/Keywords: reproduction; recruitment; isotopes; food web
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APA (6th Edition):
Zeug, S. C. (2009). Demographic and trophic dynamics of fishes in relation to hydrologic variation in channel and floodplain habitats of the Brazos River, Texas. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1971
Chicago Manual of Style (16th Edition):
Zeug, Steven Christopher. “Demographic and trophic dynamics of fishes in relation to hydrologic variation in channel and floodplain habitats of the Brazos River, Texas.” 2009. Doctoral Dissertation, Texas A&M University. Accessed February 28, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-1971.
MLA Handbook (7th Edition):
Zeug, Steven Christopher. “Demographic and trophic dynamics of fishes in relation to hydrologic variation in channel and floodplain habitats of the Brazos River, Texas.” 2009. Web. 28 Feb 2021.
Vancouver:
Zeug SC. Demographic and trophic dynamics of fishes in relation to hydrologic variation in channel and floodplain habitats of the Brazos River, Texas. [Internet] [Doctoral dissertation]. Texas A&M University; 2009. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1971.
Council of Science Editors:
Zeug SC. Demographic and trophic dynamics of fishes in relation to hydrologic variation in channel and floodplain habitats of the Brazos River, Texas. [Doctoral Dissertation]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1971
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