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Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)
1.
Χατζηϊωάννου, Μαριάνθη.
Συνεισφορά στη μελέτη της βιολογίας και οικολογίας των πνευμονοφόρων γαστερόποδων της λίμνης Κερκίνης.
Degree: 2002, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)
URL: http://hdl.handle.net/10442/hedi/14539 
► Monthly and forthnightly samplings were taken between April 1989 and November 1991 for the study of biology and population dynamics of freshwater pulmonate gastropods in…
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▼ Monthly and forthnightly samplings were taken between April 1989 and November 1991 for the study of biology and population dynamics of freshwater pulmonate gastropods in lake Kerkini. The study was carried out in the old river bed of Strymonas river, in the northern part of the lake, where three different pulmonate species coexisted, P. acuta, L. stagnalis and L. auricularia. The seasonal variation of the water temperature in the lake was the same throughout the three years of the study. Dissolved oxygen in the water, during 1991 ranged between 2 and 8 mg/ l reaching the lowest values in the summer and the highest in autumn. pH values ranged between 7.25 and 9.5 and conductivity between 250 and 480 μs/cm. . Total hardness values ranged between 80 and 250 mg CaCO3/ l , therefore water can be characterized as medium hard to hard. Variation was noted in the concentration of orthophosphate (from 0.01 to 0.10 mg/ l) and chloride (from 3 to 17.9 mg/ l) in the water during 1991, while the highest values in both cases appeared in summer and autumn. In the present study a quantitative sampler was used for plant and pulmonate samples from different depths. The abudance of the three pulmonate species was estimated in relation to the water volume at different water depths, as well as their horizontal and vertical distribution. Seasonal variation of the relative distribution by λ2 index showed that spatial distribution of all three species appeared contagious on water surface with the exception of early spring for L. stagnalis. For the later species more samples appeared with a random distribution in relation to water depth. The distribution of L. stagnalis and L. auricularia was contagious on the water surface but random in the deeper layers.
Στο χρονικό διάστημα Aπρίλιος 1989 - Nοέμβριος 1991 πραγματοποιήθηκαν δεκαπενθήμερες και μηνιαίες δειγματοληψίες για τη μελέτη της βιολογίας και της δυναμικής των πληθυσμών των πνευμονοφόρων γαστεροπόδων της λίμνης Kερκίνης. H έρευνα έγινε στην παλιά κοίτη του ποταμού Στρυμώνα στο βόρειο τμήμα της λίμνης όπου συνυπήρχαν τρία είδη πνευμονοφόρων : η P. acuta η L. stagnalis και η L. auricularia. H εποχική διακύμανση της θερμοκρασίας του νερού της λίμνης ήταν όμοια και τα 3 χρόνια της μελέτης. Tο διαλυμένο στο νερό O2 στη διάρκεια του 1991 κυμάνθηκε από 2 έως 8 mg/ l με τις χαμηλότερες τιμές να εμφανίζονται το καλοκαίρι και τις υψηλότερες την άνοιξη και το φθινόπωρο. Tο pH κυμάνθηκε από 7.25 έως 9.5 και η αγωγιμότητα του νερού από 250 έως 480 μs/cm. Oι τιμές της ολικής σκληρότητας του νερού κυμάνθηκαν από 80 έως 250 mg CaCO3/ l και έτσι τα νερά χαρακτηρίστηκαν απο μετρίως σκληρά έως σκληρά. Στη διάρκεια του 1991 καταγράφηκε έντονη μεταβολή της περιεκτικότητας του νερού σε ορθοφωσφορικά (από 0.01 έως 0.10 mg/ l) και σε ιόντα χλωρίου (από 3 έως 17.9 mg/ l), ενώ οι υψηλότερες τιμές και στις δυο περιπτώσεις εμφανίστηκαν το καλοκαίρι. Στην παρούσα μελέτη χρησιμοποιήθηκε ποσοτικός δειγματολήπτης για λήψη δειγμάτων υδρόβιων φυτών και πνευμονοφόρων γαστεροπόδων παρέχοντας τη δυνατότητα για…
Subjects/Keywords: Πνευμονοφόρα Γαστερόποδα; Δυναμική πληθυσμών; Αναπαραγωγή; Βιοενεργητική; Κερκίνη, Λίμνη; Pulmonate gastropods; Physa acuta; Population dynamics; Reproduction; Bioenergetic; Lake Kerkini
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APA (6th Edition):
Χατζηϊωάννου, . . (2002). Συνεισφορά στη μελέτη της βιολογίας και οικολογίας των πνευμονοφόρων γαστερόποδων της λίμνης Κερκίνης. (Thesis). Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Retrieved from http://hdl.handle.net/10442/hedi/14539
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Χατζηϊωάννου, Μαριάνθη. “Συνεισφορά στη μελέτη της βιολογίας και οικολογίας των πνευμονοφόρων γαστερόποδων της λίμνης Κερκίνης.” 2002. Thesis, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Accessed April 19, 2021.
http://hdl.handle.net/10442/hedi/14539.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Χατζηϊωάννου, Μαριάνθη. “Συνεισφορά στη μελέτη της βιολογίας και οικολογίας των πνευμονοφόρων γαστερόποδων της λίμνης Κερκίνης.” 2002. Web. 19 Apr 2021.
Vancouver:
Χατζηϊωάννου . Συνεισφορά στη μελέτη της βιολογίας και οικολογίας των πνευμονοφόρων γαστερόποδων της λίμνης Κερκίνης. [Internet] [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2002. [cited 2021 Apr 19].
Available from: http://hdl.handle.net/10442/hedi/14539.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Χατζηϊωάννου . Συνεισφορά στη μελέτη της βιολογίας και οικολογίας των πνευμονοφόρων γαστερόποδων της λίμνης Κερκίνης. [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2002. Available from: http://hdl.handle.net/10442/hedi/14539
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
2.
Justice, James R.
Nanosilver ecotoxicity : chronic effects on the freshwater gastropod, Physa acuta, and influence of abiotic factors.
Degree: Thesis (M.S.), 2013, Ball State University
URL: http://cardinalscholar.bsu.edu/handle/123456789/197432
► Freshwater ecosystems will likely become sinks for future silver loadings as a result of increased nanosilver (n-Ag) use in industrial and commercial applications. A series…
(more)
▼ Freshwater ecosystems will likely become sinks for future silver loadings as a result of
increased nanosilver (n-Ag) use in industrial and commercial applications. A series of bioassays
was performed to assess how n-Ag toxicity may be influenced by abiotic factors associated with
natural freshwater ecosystems. Additionally, these bioassays provide insight into how
environmentally relevant concentrations of n-Ag may sublethaly affect the freshwater benthic
gastropod,
Physa acuta, that plays pivotal roles in maintaining the structure and function of
freshwater ecosystems. In sediment with no benthic organic carbon (BOC), gastropod vital rates
decreased in treatments containing any n-Ag, gastropods in sediment with relatively low BOC
appeared to trade off growth for reproduction at high n-Ag treatments, while gastropod vital
rates in high BOC sediment remained unaffected at all nanosilver treatments. Sediment type
may abate nanosilver toxicity as a result of organic carbon content. Effects of n-Ag on gastropod
vital rates were not dependant on pH, suggesting aqueous pH does not directly influence n-Ag
toxicity. Nanosilver (0.2 μg/L) stressed gastropods, altering their growth and reproduction
tradeoff dynamics. Nanosilver concentrations modeled to exist in natural freshwaters, disrupted
gastropod ability to detect and respond to a natural predator, while greater n-Ag concentrations
stimulated gastropods to exhibit contaminant avoidance behavior and thereby attempted to flee
their habitat. This study provides direction in understanding how adverse n-Ag effects may be
influenced by abiotic parameters, while assessing sublethal effects of n-Ag on freshwater gastropods that are likely to occur in natural freshwater ecosystems, given current estimates of
environmental n-Ag concentrations.
Advisors/Committee Members: Bernot, Randall J. (advisor).
Subjects/Keywords: Nanostructured materials – Environmental aspects.; Silver – Environmental aspects.; Physa – Effect of pollution on.; Water – Pollution.
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APA (6th Edition):
Justice, J. R. (2013). Nanosilver ecotoxicity : chronic effects on the freshwater gastropod, Physa acuta, and influence of abiotic factors. (Masters Thesis). Ball State University. Retrieved from http://cardinalscholar.bsu.edu/handle/123456789/197432
Chicago Manual of Style (16th Edition):
Justice, James R. “Nanosilver ecotoxicity : chronic effects on the freshwater gastropod, Physa acuta, and influence of abiotic factors.” 2013. Masters Thesis, Ball State University. Accessed April 19, 2021.
http://cardinalscholar.bsu.edu/handle/123456789/197432.
MLA Handbook (7th Edition):
Justice, James R. “Nanosilver ecotoxicity : chronic effects on the freshwater gastropod, Physa acuta, and influence of abiotic factors.” 2013. Web. 19 Apr 2021.
Vancouver:
Justice JR. Nanosilver ecotoxicity : chronic effects on the freshwater gastropod, Physa acuta, and influence of abiotic factors. [Internet] [Masters thesis]. Ball State University; 2013. [cited 2021 Apr 19].
Available from: http://cardinalscholar.bsu.edu/handle/123456789/197432.
Council of Science Editors:
Justice JR. Nanosilver ecotoxicity : chronic effects on the freshwater gastropod, Physa acuta, and influence of abiotic factors. [Masters Thesis]. Ball State University; 2013. Available from: http://cardinalscholar.bsu.edu/handle/123456789/197432
3.
Zello, Scott E.
Multi-stressor effects of endocrine disrupting compounds on Physa acuta.
Degree: Thesis (M.S.), 2018, Ball State University
URL: http://cardinalscholar.bsu.edu/handle/123456789/201155
► Endocrine disrupting compounds (EDCs) are ubiquitous in freshwater ecosystems due to point and non-point pollution. In freshwater ecosystems, these compounds occur as contaminant mixtures. Although…
(more)
▼ Endocrine disrupting compounds (EDCs) are ubiquitous in freshwater ecosystems due to
point and non-point pollution. In freshwater ecosystems, these compounds occur as contaminant
mixtures. Although concentrations measured (ng/L) are generally below expected levels for
acute effects, the potential for adverse effects associated with chronic exposure are not well
understood. Further, organismal response to multiple contaminants simultaneously has not been
explored. This research quantified chronic effects of multiple EDCs on the freshwater snail
Physa acuta over 24 days of exposure to assess how the number of contaminants may influence
survival, growth, reproduction, movement, and shell strength. Overall, P. acuta responses to
EDC mixtures were different than responses to single EDC exposure. Specifically, P. acuta
exposed to five EDCs had lower survival than P. acuta exposed to fewer EDCs. Fecundity of P.
acuta exposed to an EDC mixture was lower than fecundity of P. acuta exposed to single EDCs.
These data highlight the importance of contaminant interactions on aquatic organisms and
suggest the potential for adverse effects cannot be assessed using individual contaminant
responses. Since human pharmaceutical use is expected to continue to increase, it is important to
understand how EDCs may affect freshwater ecosystems.
Advisors/Committee Members: Bernot, Melody J. (advisor).
Subjects/Keywords: Endocrine disrupting chemicals – Environmental aspects.; Physa – Effect of water pollution on.
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APA (6th Edition):
Zello, S. E. (2018). Multi-stressor effects of endocrine disrupting compounds on Physa acuta. (Masters Thesis). Ball State University. Retrieved from http://cardinalscholar.bsu.edu/handle/123456789/201155
Chicago Manual of Style (16th Edition):
Zello, Scott E. “Multi-stressor effects of endocrine disrupting compounds on Physa acuta.” 2018. Masters Thesis, Ball State University. Accessed April 19, 2021.
http://cardinalscholar.bsu.edu/handle/123456789/201155.
MLA Handbook (7th Edition):
Zello, Scott E. “Multi-stressor effects of endocrine disrupting compounds on Physa acuta.” 2018. Web. 19 Apr 2021.
Vancouver:
Zello SE. Multi-stressor effects of endocrine disrupting compounds on Physa acuta. [Internet] [Masters thesis]. Ball State University; 2018. [cited 2021 Apr 19].
Available from: http://cardinalscholar.bsu.edu/handle/123456789/201155.
Council of Science Editors:
Zello SE. Multi-stressor effects of endocrine disrupting compounds on Physa acuta. [Masters Thesis]. Ball State University; 2018. Available from: http://cardinalscholar.bsu.edu/handle/123456789/201155
East Carolina University
4.
Gordon, Katherine E.
TEMPERATURE, RESOURCE INPUT, AND STANDING GENETIC VARIATION AFFECT PREDATOR RESPONSES OF PHYSA ACUTA.
Degree: MS, MS-Biology, 2019, East Carolina University
URL: http://hdl.handle.net/10342/7260
► In urban areas, features such as high percentages of impervious ground cover, patchiness, and storm water runoff can lead to increases in temperature and external…
(more)
▼ In urban areas, features such as high percentages of impervious ground cover, patchiness, and storm water runoff can lead to increases in temperature and external nutrient input into aquatic systems. Such factors can lead to changes in primary productivity, and thus the growth rates of primary consumers, as well as the vulnerability of primary consumers to predation. Additionally, isolated populations due to patchiness of natural areas in urban environments can lead to inbred populations, which can also influence growth rates and vulnerability of primary consumers. To assess how such factors can influence interspecific interactions, we test how temperature, resource availability, and standing genetic variation of the freshwater snail
Physa acuta affects the snail's anti-predator responses and life history characteristics. We conducted an experiment in which we reared snails from inbred or wild-caught lineages at high or low temperatures, with high and low resource inputs, and with or without chemical cues of crayfish (Procambarus clarkii) predation. We assessed how these treatments affected predator avoidance behavior, anti-predator morphological responses, reproductive output, and survival. We found that snails reared in high temperatures, and with low resource availability were unable to exhibit typical morphological responses to predators. We also found that snails were more likely to exhibit anti-predator behaviors when resource availability was low and when temperatures were high, and that behavioral responses to predators were higher for inbred snails than wild-caught snails. Snail survival was significantly affected by temperature, resource availability, and standing genetic variation. Reproductive output of snails was also affected by temperature, resource availability, predator cue presence, and standing genetic variation. These results indicate that features common in urban systems can influence not only individuals' ability to persist in these environments, but also can have effects on species interactions in ways that can cascade through food webs and potentially change ecosystem functions.
Advisors/Committee Members: McCoy, Michael W. (advisor).
Subjects/Keywords: Behavioral Avoidance; Phenotypic Plasticity; Physa acuta; Resource Availability; Predation (Biology) – Environmental aspects; Temperature – Environmental aspects; Variation (Biology); Snails – Behavior; Predatory animals – Ecology
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APA (6th Edition):
Gordon, K. E. (2019). TEMPERATURE, RESOURCE INPUT, AND STANDING GENETIC VARIATION AFFECT PREDATOR RESPONSES OF PHYSA ACUTA. (Masters Thesis). East Carolina University. Retrieved from http://hdl.handle.net/10342/7260
Chicago Manual of Style (16th Edition):
Gordon, Katherine E. “TEMPERATURE, RESOURCE INPUT, AND STANDING GENETIC VARIATION AFFECT PREDATOR RESPONSES OF PHYSA ACUTA.” 2019. Masters Thesis, East Carolina University. Accessed April 19, 2021.
http://hdl.handle.net/10342/7260.
MLA Handbook (7th Edition):
Gordon, Katherine E. “TEMPERATURE, RESOURCE INPUT, AND STANDING GENETIC VARIATION AFFECT PREDATOR RESPONSES OF PHYSA ACUTA.” 2019. Web. 19 Apr 2021.
Vancouver:
Gordon KE. TEMPERATURE, RESOURCE INPUT, AND STANDING GENETIC VARIATION AFFECT PREDATOR RESPONSES OF PHYSA ACUTA. [Internet] [Masters thesis]. East Carolina University; 2019. [cited 2021 Apr 19].
Available from: http://hdl.handle.net/10342/7260.
Council of Science Editors:
Gordon KE. TEMPERATURE, RESOURCE INPUT, AND STANDING GENETIC VARIATION AFFECT PREDATOR RESPONSES OF PHYSA ACUTA. [Masters Thesis]. East Carolina University; 2019. Available from: http://hdl.handle.net/10342/7260
Oklahoma State University
5.
Wells, Allison.
Reproductive life history decisions and success of freshwater pond snails (Physa acuta) during chronic zinc exposure.
Degree: Integrative Biology, 2019, Oklahoma State University
URL: http://hdl.handle.net/11244/324920
► Life history theory examines how individuals should make trade-offs between current reproductive effort and survival to achieve future reproductive gains. A prediction is that as…
(more)
▼ Life history theory examines how individuals should make trade-offs between current reproductive effort and survival to achieve future reproductive gains. A prediction is that as future life expectancy decreases, individuals should invest more in current reproduction at the cost of lower survival and future reproduction. Although P. acuta have been shown to display a relatively high tolerance to anthropogenic contaminants and pollutants, research regarding sub-lethal chronic exposure to contaminants and reproductive effort is limited. However, it has been shown that higher zinc concentrations lower P. acuta survival rates. Therefore, the objective of this study was to determine if chronic sub-lethal exposure to zinc has the potential to alter an individual's reproductive life history decisions, and if the magnitudes of these decisions are dependent upon a site's historic zinc exposure. Snails were collected from 3 sites within the Grand Lake watershed that have different zinc concentrations. Their offspring were then exposed to one of 5 zinc concentrations over the course of ~18 weeks. Individuals from these sites showed differences in response to zinc treatments. Individuals from historically moderate zinc concentrations followed life history predictions most closely, as an increase in zinc treatment resulted in earlier timing of reproductive events and growth. However, individuals from historically low zinc exposure showed delayed growth and reproduction as zinc concentration increased. Individuals from high historic zinc exposure in general displayed few negative effects from the zinc treatments, likely due to a high zinc tolerance among these individuals. Overall, results showed evidence of a gradient of local adaptation and tolerance of zinc. Tolerance seemed to be a key factor in whether individuals make life history changes in response to metal contamination.
Advisors/Committee Members: Luttbeg, Barney (advisor), Towner, Mary (committee member), Belden, Jason (committee member).
Subjects/Keywords: life history; physa; reproduction; tolerance; zinc
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APA (6th Edition):
Wells, A. (2019). Reproductive life history decisions and success of freshwater pond snails (Physa acuta) during chronic zinc exposure. (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/324920
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wells, Allison. “Reproductive life history decisions and success of freshwater pond snails (Physa acuta) during chronic zinc exposure.” 2019. Thesis, Oklahoma State University. Accessed April 19, 2021.
http://hdl.handle.net/11244/324920.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wells, Allison. “Reproductive life history decisions and success of freshwater pond snails (Physa acuta) during chronic zinc exposure.” 2019. Web. 19 Apr 2021.
Vancouver:
Wells A. Reproductive life history decisions and success of freshwater pond snails (Physa acuta) during chronic zinc exposure. [Internet] [Thesis]. Oklahoma State University; 2019. [cited 2021 Apr 19].
Available from: http://hdl.handle.net/11244/324920.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wells A. Reproductive life history decisions and success of freshwater pond snails (Physa acuta) during chronic zinc exposure. [Thesis]. Oklahoma State University; 2019. Available from: http://hdl.handle.net/11244/324920
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
6.
Agostinho, Margarida Manuela Melão.
Um aquário na sala de aula.
Degree: 2007, RCAAP
URL: http://www.rcaap.pt/detail.jsp?id=oai:sapientia.ualg.pt:10400.1/594
► Dissertação mest., Biologia e Geologia - Educação, Universidade do Algarve, 2007
A motivação dos alunos para o estudo das ciências e do método científico tem…
(more)
▼ Dissertação mest., Biologia e Geologia - Educação, Universidade do Algarve, 2007
A motivação dos alunos para o estudo das ciências e do método científico tem desde sempre preocupado docentes e investigadores. Muitas têm sido as metodologias testadas com maior ou menor sucesso.
O trabalho subjacente a esta dissertação teve por base a experiência na docência ao longo de alguns anos e a necessidade constante de aperfeiçoar metodologias e técnicas de formação tendo em vista o desenvolvimento de competências para a vida. Sugerem-se assim algumas abordagens dos conteúdos lectivos, na área da Biologia, do 3º ciclo e secundário, através da proposta de actividades investigativas utilizando o aquário. Estas sugestões de actividades são acompanhadas por um pequeno suporte teórico e por sugestões práticas de procedimentos facilitadores do trabalho em laboratório com aquários.
As actividades propostas permitiram que alguns alunos desenvolvessem projectos utilizando a metodologia de trabalho investigativo. Através da realização de inquéritos verifica-se que a maioria dos alunos apontaram a aprendizagem com trabalho investigativo mais vantajosa para a aprendizagem e desenvolvimento de competências para a vida do que a aprendizagem com recurso a métodos expositivos.
Advisors/Committee Members: Pires, Maria Sofia Júdice Gamito.
Subjects/Keywords: Teses; Ensino; Biologia; Microrganismos; Aquário; Danio rerio; Physa
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APA (6th Edition):
Agostinho, M. M. M. (2007). Um aquário na sala de aula. (Thesis). RCAAP. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:sapientia.ualg.pt:10400.1/594
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Agostinho, Margarida Manuela Melão. “Um aquário na sala de aula.” 2007. Thesis, RCAAP. Accessed April 19, 2021.
http://www.rcaap.pt/detail.jsp?id=oai:sapientia.ualg.pt:10400.1/594.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Agostinho, Margarida Manuela Melão. “Um aquário na sala de aula.” 2007. Web. 19 Apr 2021.
Vancouver:
Agostinho MMM. Um aquário na sala de aula. [Internet] [Thesis]. RCAAP; 2007. [cited 2021 Apr 19].
Available from: http://www.rcaap.pt/detail.jsp?id=oai:sapientia.ualg.pt:10400.1/594.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Agostinho MMM. Um aquário na sala de aula. [Thesis]. RCAAP; 2007. Available from: http://www.rcaap.pt/detail.jsp?id=oai:sapientia.ualg.pt:10400.1/594
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
7.
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 April 19, 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. 19 Apr 2021.
Vancouver:
Garza MI. Predator induced defenses in prey with diverse predators. [Internet] [Masters thesis]. Texas A&M University; 2006. [cited 2021 Apr 19].
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
Université Montpellier II
8.
Pélissié, Benjamin.
Sélection sexuelle et hermaphrodisme : approche expérimentale quantitative chez le gastéropode d'eau douce Physa acuta. : Sexual selection and hermaphroditism : quantitative empirical approach in the freshwater gastropod Physa acuta.
Degree: Docteur es, Biologie des populations et écologie, 2010, Université Montpellier II
URL: http://www.theses.fr/2010MON20238
► La théorie de la sélection sexuelle a été largement élaborée à partir du constat de dimorphisme sexuel chez les espèces à sexes séparés. Une de…
(more)
▼ La théorie de la sélection sexuelle a été largement élaborée à partir du constat de dimorphisme sexuel chez les espèces à sexes séparés. Une de ses caractéristiques générales est une sélection plus forte pour l'augmentation du nombre de partenaires sexuels chez les mâles que chez les femelles qui résulterait d'un investissement différentiel dans les descendants entre les deux sexes (anisogamie). Si hermaphrodisme et sélection sexuelle sont considérés comme compatibles depuis les travaux de Charnov (1979), les études sur le sujet restent rares que ce soit chez des animaux ou des plantes. Une raison importante est que la méthodologie disponible pour quantifier la sélection sexuelle ne prend pas en compte les particularités des hermaphrodites (par ex., corrélations ou effets croisés entre les deux fonctions sexuelles d'un même individu, autofécondation). Le premier objectif de cette thèse est de combler cette lacune méthodologique en proposant un cadre travail adapté aux hermaphrodites, que nous appliquons dans une étude empirique chez Physa acuta, un gastéropode hermaphrodite d'eau douce. Nous observons que la sélection sexuelle est plus intense sur la fonction mâle, comme généralement chez les espèces gonochoriques. Par ailleurs, nous ne détectons aucun effet des particularités des hermaphrodites dans cette expérience. Dans un deuxième temps, nous nous intéressons de manière plus détaillée aux composantes du succès reproducteur mâle (RSm). Nous montrons que chez P. acuta il existe une priorité spermatique au premier partenaire mâle lorsque plusieurs individus sont en compétition. Enfin, nous proposons une décomposition de la variance de RSm en ses composantes pré- et post-copulatoires, qui représentent respectivement 60 et 40% de la variance. Dans la troisième partie, nous intégrons la sélection sexuelle à l'étude de l'évolution de l'allocation sexuelle d'un hermaphrodite, via une approche d'évolution expérimentale chez P. acuta. Menée sur plus de 10 générations, elle vise à faire évoluer l'allocation sexuelle de manière disruptive (lignées mâle ou femelle) en sélectionnant les composantes mâle et femelle du succès reproducteur. Les résultats préliminaires suggèrent qu'il est possible de manipuler l'allocation sexuelle chez un hermaphrodite simultané en sélectionnant sur son régime d'appariement. Nous concluons que l'anisogamie suffit à justifier l'existence de la sélection sexuelle sans avoir à supposer un dimorphisme sexuel. Son étude chez les hermaphrodites simultanés ouvre des perspectives pour la compréhension du rôle de l'allocation sexuelle dans l'évolution des systèmes de reproduction.
A cornerstone of the theory of sexual selection in gonochoric species is sexual dimorphism. A very general result is stronger selection on males than on females for increasing mating success, and this fundamentally relies on differential investment in offspring between the sexes (anisogamy). Although sexual selection does operate in hermaphroditic species as well, few empirical studies have been performed whether in animals…
Advisors/Committee Members: David, Patrice (thesis director), Jarne, Philippe (thesis director).
Subjects/Keywords: Physa acuta; Hermaphrodisme simultané; Sélection sexuelle; Allocation sexuelle; Gradients de sélection; Évolution expérimentale; Physa acuta; Simultaneous hermaphroditism; Sexual selection; Sexual allocation; Selection gradients; Experimental evolution
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APA (6th Edition):
Pélissié, B. (2010). Sélection sexuelle et hermaphrodisme : approche expérimentale quantitative chez le gastéropode d'eau douce Physa acuta. : Sexual selection and hermaphroditism : quantitative empirical approach in the freshwater gastropod Physa acuta. (Doctoral Dissertation). Université Montpellier II. Retrieved from http://www.theses.fr/2010MON20238
Chicago Manual of Style (16th Edition):
Pélissié, Benjamin. “Sélection sexuelle et hermaphrodisme : approche expérimentale quantitative chez le gastéropode d'eau douce Physa acuta. : Sexual selection and hermaphroditism : quantitative empirical approach in the freshwater gastropod Physa acuta.” 2010. Doctoral Dissertation, Université Montpellier II. Accessed April 19, 2021.
http://www.theses.fr/2010MON20238.
MLA Handbook (7th Edition):
Pélissié, Benjamin. “Sélection sexuelle et hermaphrodisme : approche expérimentale quantitative chez le gastéropode d'eau douce Physa acuta. : Sexual selection and hermaphroditism : quantitative empirical approach in the freshwater gastropod Physa acuta.” 2010. Web. 19 Apr 2021.
Vancouver:
Pélissié B. Sélection sexuelle et hermaphrodisme : approche expérimentale quantitative chez le gastéropode d'eau douce Physa acuta. : Sexual selection and hermaphroditism : quantitative empirical approach in the freshwater gastropod Physa acuta. [Internet] [Doctoral dissertation]. Université Montpellier II; 2010. [cited 2021 Apr 19].
Available from: http://www.theses.fr/2010MON20238.
Council of Science Editors:
Pélissié B. Sélection sexuelle et hermaphrodisme : approche expérimentale quantitative chez le gastéropode d'eau douce Physa acuta. : Sexual selection and hermaphroditism : quantitative empirical approach in the freshwater gastropod Physa acuta. [Doctoral Dissertation]. Université Montpellier II; 2010. Available from: http://www.theses.fr/2010MON20238
9.
Moore, Alexandria C.
Taxonomic and Morphological Evaluation of an Endemic Freshwater Gastropod.
Degree: MS, Ecology and Evolutionary Biology, 2013, University of Michigan
URL: http://hdl.handle.net/2027.42/98979
► Mollusks are the second most diverse animal phylum in terms of number of described species and nonmarine mollusks are among the most imperiled groups of…
(more)
▼ Mollusks are the second most diverse animal phylum in terms of number of described species and nonmarine mollusks are among the most imperiled groups of invertebrate taxa. In particular, freshwater and terrestrial mollusks have the highest number of documented extinctions of any major taxonomic group. Such extinctions are not without their consequences as nonmarine mollusks provide several ecosystem functions including regulation of rates of primary production, decomposition, water clarity, and nutrient cycling. Given this and the level of fluidity found within freshwater mollusk taxonomy, the proper identification of potentially endangered species is an issue of great concern.
The present study evaluates the taxonomic status of a small freshwater snail endemic to southeastern Oregon within the Owyhee River, referred to here as the Owyhee
physa. Molecular, morphological, and environmental analyses were employed using specimens from both a sister species, “
Physa gyrina”, and another species with similar morphology and habitat conditions as the Owyhee
physa,
Physa zionis. Molecular analyses also incorporated supplemental sequences from other physid species to assess the status of the Owyhee
physa within the Physidae family. Genetic analyses at the cytochrome oxidase 1 and ITS-1 and ITS-2 gene regions indicate that the Owyhee
physa is a phylogenetically distinct species with “
Physa gyrina” as its sister species. Using theoretical morphological techniques, the shell morphology of each of the three physid species was qualitatively described. Qualitative analyses of these morphological descriptions along with the phylogenetic tree and environmental data for each species suggests that convergent evolution played an important role in influencing shell morphology within this taxonomic group. The present work has provided additional
information about the current status of Physidae species richness, but additional studies must be done to both broaden and deepen our knowledge of freshwater gastropod diversity.
Advisors/Committee Members: Duda, Thomas F. (advisor), Burch, John B. (committee member), Dick, Christopher W. (committee member), Pappas, Janice L. (committee member).
Subjects/Keywords: Mollusks, Physa, Taxonomy, Conservation, Morphology, Evolution; Science - Conservation Genetics
…referred to here as the Owyhee physa.
Molecular, morphological, and environmental analyses were… …employed using specimens from
both a sister species, “Physa gyrina”, and another species with… …similar morphology and habitat
conditions as the Owyhee physa, Physa zionis. Molecular analyses… …the Owyhee physa
within the Physidae family. Genetic analyses at the cytochrome oxidase 1… …and ITS-1 and ITS-2
gene regions indicate that the Owyhee physa is a phylogenetically…
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APA (6th Edition):
Moore, A. C. (2013). Taxonomic and Morphological Evaluation of an Endemic Freshwater Gastropod. (Masters Thesis). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/98979
Chicago Manual of Style (16th Edition):
Moore, Alexandria C. “Taxonomic and Morphological Evaluation of an Endemic Freshwater Gastropod.” 2013. Masters Thesis, University of Michigan. Accessed April 19, 2021.
http://hdl.handle.net/2027.42/98979.
MLA Handbook (7th Edition):
Moore, Alexandria C. “Taxonomic and Morphological Evaluation of an Endemic Freshwater Gastropod.” 2013. Web. 19 Apr 2021.
Vancouver:
Moore AC. Taxonomic and Morphological Evaluation of an Endemic Freshwater Gastropod. [Internet] [Masters thesis]. University of Michigan; 2013. [cited 2021 Apr 19].
Available from: http://hdl.handle.net/2027.42/98979.
Council of Science Editors:
Moore AC. Taxonomic and Morphological Evaluation of an Endemic Freshwater Gastropod. [Masters Thesis]. University of Michigan; 2013. Available from: http://hdl.handle.net/2027.42/98979
University of New Mexico
10.
Nolan, Journey R.
Molecular characterization of the freshwater snail Physella acuta.
Degree: UNM Biology Department, 2013, University of New Mexico
URL: https://digitalrepository.unm.edu/biol_etds/87
► Current insights into general animal biology, including immune function, are derived mostly from a few model organisms, a necessity imposed by effort required for in-depth…
(more)
▼ Current insights into general animal biology, including immune function, are derived mostly from a few model organisms, a necessity imposed by effort required for in-depth studies. Modern next-generation sequencing (NGS) enables genomics-level investigations to test whether specific aspects of biology are general or unique across animal phylogeny. Meaningful comparisons require thorough identification of phylogenetically-relevant species. To provide a touchstone for Biomphalaria glabrata, a freshwater snail that is a major study model for invertebrate immunity, physid snails (Physidae; Hygrophila; Panpulmonata; Gastropoda; Mollusca) will be developed as a model for comparative immunogenomics. Chapter 1 introduces current research capabilities and details the rationale behind developing a physid as a comparative model for B. glabrata. Chapter 2, submitted as a manuscript to the Journal of Molluscan Studies, describes the molecular characterization that was performed for species identification and confirms taxonomic placement of physid snails relative to B. glabrata. Comparative mitogenomics revealed high levels of intraspecific sequence divergence between the entire mitochondrial genomes of the two P. acuta isolates, identified a unique gene order, and compared substitutions rates of gene sequences from the mitochondrial genomes of other gastropods. Additional materials are provided in the Appendices; Appendix A provides supplemental information for Chapter 2 and Appendix B provides a report of preliminary results from NGS-based gene discovery for initial characterization of the immune response of P. acuta to bacterial exposure toward comparative immunogenomics. Results from this thesis support continuing efforts to develop P. acuta as a comparative immunogenomic model to B. glabrata.
Advisors/Committee Members: Adema, Dr. Coenraad M., Stricker, Dr. Stephen, Takacs-Vesbach, Dr. Cristina.
Subjects/Keywords: gastropod; Physella acuta; Physa acuta; mitochondria; mitogenomics; transcriptomics; 454; next generational sequencing; Biomphalaria glabrata; gene rearrangements; dN/dS; Ka/Ks; intraspecific sequence differences; invertebrate immunology; lophotrochozoa; Mollusca; FREP
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APA (6th Edition):
Nolan, J. R. (2013). Molecular characterization of the freshwater snail Physella acuta. (Masters Thesis). University of New Mexico. Retrieved from https://digitalrepository.unm.edu/biol_etds/87
Chicago Manual of Style (16th Edition):
Nolan, Journey R. “Molecular characterization of the freshwater snail Physella acuta.” 2013. Masters Thesis, University of New Mexico. Accessed April 19, 2021.
https://digitalrepository.unm.edu/biol_etds/87.
MLA Handbook (7th Edition):
Nolan, Journey R. “Molecular characterization of the freshwater snail Physella acuta.” 2013. Web. 19 Apr 2021.
Vancouver:
Nolan JR. Molecular characterization of the freshwater snail Physella acuta. [Internet] [Masters thesis]. University of New Mexico; 2013. [cited 2021 Apr 19].
Available from: https://digitalrepository.unm.edu/biol_etds/87.
Council of Science Editors:
Nolan JR. Molecular characterization of the freshwater snail Physella acuta. [Masters Thesis]. University of New Mexico; 2013. Available from: https://digitalrepository.unm.edu/biol_etds/87
University of Oklahoma
11.
Beames, Calvin Greenwood.
A study of the glycolytic enzymes in the aquatic snail Physa halei Lea.
Degree: PhD, 1961, University of Oklahoma
URL: http://hdl.handle.net/11244/1491
Subjects/Keywords: Biology, Zoology.; Glycolysis.; Enzymes.; Physa halei.
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APA (6th Edition):
Beames, C. G. (1961). A study of the glycolytic enzymes in the aquatic snail Physa halei Lea. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/1491
Chicago Manual of Style (16th Edition):
Beames, Calvin Greenwood. “A study of the glycolytic enzymes in the aquatic snail Physa halei Lea.” 1961. Doctoral Dissertation, University of Oklahoma. Accessed April 19, 2021.
http://hdl.handle.net/11244/1491.
MLA Handbook (7th Edition):
Beames, Calvin Greenwood. “A study of the glycolytic enzymes in the aquatic snail Physa halei Lea.” 1961. Web. 19 Apr 2021.
Vancouver:
Beames CG. A study of the glycolytic enzymes in the aquatic snail Physa halei Lea. [Internet] [Doctoral dissertation]. University of Oklahoma; 1961. [cited 2021 Apr 19].
Available from: http://hdl.handle.net/11244/1491.
Council of Science Editors:
Beames CG. A study of the glycolytic enzymes in the aquatic snail Physa halei Lea. [Doctoral Dissertation]. University of Oklahoma; 1961. Available from: http://hdl.handle.net/11244/1491
. 
Open Access Theses and Dissertations
