subject:(food web)

University of Alberta

1. Fortin, Barbra Linda. Selenium dynamics in Canadian Rocky Mountain lakes.

Degree: MS, Department of Biological Sciences, 2010, University of Alberta

URL: https://era.library.ualberta.ca/files/ng451j405

► I investigated, water, invertebrates and fishes from lakes in Banff National Park and Kananaskis Country, Alberta for selenium (Se), an element known to be toxic… (more)

Subjects/Keywords: fishes; selenium; mountain; food web

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APA (6^th Edition):

Fortin, B. L. (2010). Selenium dynamics in Canadian Rocky Mountain lakes. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/ng451j405

Chicago Manual of Style (16^th Edition):

Fortin, Barbra Linda. “Selenium dynamics in Canadian Rocky Mountain lakes.” 2010. Masters Thesis, University of Alberta. Accessed April 11, 2021. https://era.library.ualberta.ca/files/ng451j405.

MLA Handbook (7^th Edition):

Fortin, Barbra Linda. “Selenium dynamics in Canadian Rocky Mountain lakes.” 2010. Web. 11 Apr 2021.

Vancouver:

Fortin BL. Selenium dynamics in Canadian Rocky Mountain lakes. [Internet] [Masters thesis]. University of Alberta; 2010. [cited 2021 Apr 11]. Available from: https://era.library.ualberta.ca/files/ng451j405.

Council of Science Editors:

Fortin BL. Selenium dynamics in Canadian Rocky Mountain lakes. [Masters Thesis]. University of Alberta; 2010. Available from: https://era.library.ualberta.ca/files/ng451j405

University of Canterbury

2. Graham, Sharon Elizabeth. Mechanisms and mitigation of food web change in stream ecosystems.

Degree: PhD, Ecology, 2013, University of Canterbury

URL: http://dx.doi.org/10.26021/7565

► Freshwater ecosystems reflect the condition of their surrounding landscape, and thus are particularly vulnerable to anthropogenic stressors associated with human land-use. One of the most… (more)

▼ Freshwater ecosystems reflect the condition of their surrounding landscape, and thus are particularly vulnerable to anthropogenic stressors associated with human land-use. One of the most prevalent stressors on stream ecosystems in agricultural regions, such as the Canterbury Plains of New Zealand, is eutrophication, or increased primary productivity. The aim of this thesis was to investigate effects of eutrophication on stream communities, specifically food web structure and ecosystem function. From a food web perspective, eutrophication is a shift in the form and amount of available energy from externally-produced (allochthonous) to internal (autochthonous) basal resources. Such shifts are frequently associated with land-use intensification, due to riparian vegetation removal and increased nutrient inputs, both of which enhance autochthonous production. A field survey across a gradient of eutrophication showed that eutrophic stream food webs are largely autochthonously-based and often contain large numbers of defended primary consumers, which form trophic bottlenecks and prevent energy from reaching higher trophic levels. Consequently, while there is more total energy available, less of that energy is in a usable form for stream food webs. Moreover, I found that eutrophic streams are largely composed of generalist consumers, which shift their diets to refocus on autochthonous resources with increasing productivity. Given that eutrophication causes food web resources to become more homogenous and was a primary driver of food web change, I tested whether reintroducing allochthonous subsidies would alter or reverse the negative effects of eutrophication. To do this I conducted a short-term community assembly experiment and a year-long population biomass accrual study. I found that the simplified, generalist-dominated communities in eutrophic streams did not respond to changes in resource diversity as predicted by food web theories, which are based on more diverse food webs. After restoration of allochthonous subsidies, defended generalist taxa continued to dominate the invertebrate communities. However, while restoring allochthonous subsidies did not mitigate the numerical dominance of defended consumers, the biomass accrual of other, previously excluded desirable taxa, such as mayflies and predatory invertebrates, increased following resource additions. This indicates that more energy reached the top of the food web, suggesting that resource additions alleviated trophic bottlenecks. Overall, my findings have advanced current knowledge about key mechanisms driving food web responses to both anthropogenic stress and to restoration efforts, which can be applied to improve management and restoration of stream ecosystems.

Subjects/Keywords: stream; ecology; food web; eutrophication

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APA (6^th Edition):

Graham, S. E. (2013). Mechanisms and mitigation of food web change in stream ecosystems. (Doctoral Dissertation). University of Canterbury. Retrieved from http://dx.doi.org/10.26021/7565

Chicago Manual of Style (16^th Edition):

Graham, Sharon Elizabeth. “Mechanisms and mitigation of food web change in stream ecosystems.” 2013. Doctoral Dissertation, University of Canterbury. Accessed April 11, 2021. http://dx.doi.org/10.26021/7565.

MLA Handbook (7^th Edition):

Graham, Sharon Elizabeth. “Mechanisms and mitigation of food web change in stream ecosystems.” 2013. Web. 11 Apr 2021.

Vancouver:

Graham SE. Mechanisms and mitigation of food web change in stream ecosystems. [Internet] [Doctoral dissertation]. University of Canterbury; 2013. [cited 2021 Apr 11]. Available from: http://dx.doi.org/10.26021/7565.

Council of Science Editors:

Graham SE. Mechanisms and mitigation of food web change in stream ecosystems. [Doctoral Dissertation]. University of Canterbury; 2013. Available from: http://dx.doi.org/10.26021/7565

Cornell University

3. Fetzer, William. Disentangling The Effects Of Multiple Ecosystem Changes On Fish Population And Community Dynamics.

Degree: PhD, Natural Resources, 2013, Cornell University

URL: http://hdl.handle.net/1813/34379

► North temperate lakes are undergoing diverse physical, chemical, and biological changes, including warming water temperatures, shifts in lake trophic states, and introductions of non-native species.… (more)

▼ North temperate lakes are undergoing diverse physical, chemical, and biological changes, including warming water temperatures, shifts in lake trophic states, and introductions of non-native species. These ecosystem perturbations rarely occur in isolation, making it difficult to evaluate the impacts of concurrent perturbations on population and community dynamics. Here, I use Oneida Lake, New York, USA, to study interactions among multiple ecological changes and their combined effects on age-0 and juvenile yellow perch (Perca flavescens). These ecological changes included diversification of the predator and prey communities, shifts in lake trophic state from eutrophic to mesotrophic, and an expansion of littoral habitats. Multiple long-term limnological and fisheries datasets were integrated with short-term diet studies of age-0 yellow perch and their predators from nearshore and offshore habitats to develop a multi-habitat understanding of lake-wide responses to ecosystem perturbations. Walleye (Sander vitreus) were still the most important predator on age-0 and juvenile yellow perch, though the importance of alternative predators, such as white perch (Morone americana), smallmouth bass (Micropterus dolomieu), and largemouth bass (Micropterus salmoides), was also high and has likely increased. Consumption of age-0 yellow perch was dominated by walleye and white perch in offshore habitats during early summer, but transitioned to walleye, smallmouth bass, and largemouth bass in nearshore habitats during the fall and second year of life. As ecological conditions within the lake changed, age-0 yellow perch population dynamics became increasingly driven by littoral habitats and the population-level reliance on benthic energy pathways increased from 10-20% in the 1960s to 30-70% in the 2000s. These results illustrate the importance of both nearshore and offshore habitats to age-0 and juvenile yellow perch population dynamics and highlight the complexity of population- and community-level responses to ecosystem perturbations. Advisors/Committee Members: Rudstam, Lars Gosta (chair), Rudstam, Lars Gosta (chair), Sullivan, Patrick J (committee member), Mills, Edward Lewis (committee member), Flecker, Alexander S (committee member), Sullivan, Patrick J (committee member), Decker, Daniel Joseph (committee member), Jackson, James R. (committee member).

Subjects/Keywords: food web dynamics; aquatic ecology; individual specialization

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APA (6^th Edition):

Fetzer, W. (2013). Disentangling The Effects Of Multiple Ecosystem Changes On Fish Population And Community Dynamics. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/34379

Chicago Manual of Style (16^th Edition):

Fetzer, William. “Disentangling The Effects Of Multiple Ecosystem Changes On Fish Population And Community Dynamics.” 2013. Doctoral Dissertation, Cornell University. Accessed April 11, 2021. http://hdl.handle.net/1813/34379.

MLA Handbook (7^th Edition):

Fetzer, William. “Disentangling The Effects Of Multiple Ecosystem Changes On Fish Population And Community Dynamics.” 2013. Web. 11 Apr 2021.

Vancouver:

Fetzer W. Disentangling The Effects Of Multiple Ecosystem Changes On Fish Population And Community Dynamics. [Internet] [Doctoral dissertation]. Cornell University; 2013. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1813/34379.

Council of Science Editors:

Fetzer W. Disentangling The Effects Of Multiple Ecosystem Changes On Fish Population And Community Dynamics. [Doctoral Dissertation]. Cornell University; 2013. Available from: http://hdl.handle.net/1813/34379

University of Waterloo

4. Ives, Jessica. Isotopic niche use by the invasive mysid Hemimysis anomala in the Laurentian Great Lakes basin.

Degree: 2013, University of Waterloo

URL: http://hdl.handle.net/10012/7518

► Invasive species are a known stressor on aquatic ecosystems, particularly in the waters of the Great Lakes basin. A recent invader, Hemimysis anomala, has had… (more)

▼ Invasive species are a known stressor on aquatic ecosystems, particularly in the waters of the Great Lakes basin. A recent invader, Hemimysis anomala, has had significant impacts on the food webs of Europe, where it invaded previous to its spread to North America. However, despite the fact that Hemimysis is now widespread in the Great Lakes basin, no analysis has been done on the trophic position of Hemimysis in North America invaded sites. This thesis used carbon (δ13C) and nitrogen (δ15N) stable isotopes to examine spatial and temporal patterns in Hemimysis trophic niche use in invaded North American sites in an attempt to broaden the knowledge base on this invader and to examine potential impacts this invader may have on the food webs of the Great Lakes. A spatial comparison of trophic niche use by Hemimysis among 13 sites in Lake Erie, Lake Ontario, and the St. Lawrence River was conducted between late July and mid-September of 2011. Main sources of carbon (benthic versus pelagic production) and trophic offset, or trophic distance from basal food web items, of Hemimysis were quantified using Hemimysis δ13C and δ15N values. Results indicated that: 1) Hemimysis relied predominantly on pelagic carbon sources at the majority of sites, and isotopic differences between life-stages existed at two of the 13 sites examined, 2) the trophic offset and reliance on pelagic food sources did not differ significantly between lotic and lentic sites, and 3) the isotopic niche width of Hemimysis was spatially heterogeneous, varying by an order of magnitude among sites, but was unrelated to the degree of isotopic variation in the basal food web at each site. Observed ranges in trophic offset and the pelagic fraction of dietary carbon indicate that Hemimysis derives carbon from both benthic and water column sources, as well as at multiple trophic levels. Results support the notion that Hemimysis is an opportunistic omnivore that displays significant dietary flexibility. To test the relative importance of key biotic and abiotic factors, taken from the literature, in driving Hemimysis isotopic variation, a temporal analysis was conducted at two North American sites, one in Lake Ontario and one in the St. Lawrence River, which were repeatedly sampled for Hemimysis and related food web items between September 2008 and January 2012. Seasonal patterns of winter enrichment – summer depletion were found in Hemimysis δ15N in Lake Ontario, but a similar pattern was not seen in the St. Lawrence River. Multiple regression models were used to determine the importance of water temperature, Hemimysis C:N ratios, Hemimysis length, and the isotopic values of basal food web components in explaining observed variation in Hemimysis δ13C and δ15N values. Significant relationships were found between Hemimysis isotopic values and water temperature, but relationships with the isotopic signatures of the pelagic basal food web were weak or nonexistent. Hemimysis δ13C values were significantly correlated with C:N ratios. Strong evidence of an ontogenetic…

Subjects/Keywords: stable isotopes; invasive species; food web

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APA (6^th Edition):

Ives, J. (2013). Isotopic niche use by the invasive mysid Hemimysis anomala in the Laurentian Great Lakes basin. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/7518

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ives, Jessica. “Isotopic niche use by the invasive mysid Hemimysis anomala in the Laurentian Great Lakes basin.” 2013. Thesis, University of Waterloo. Accessed April 11, 2021. http://hdl.handle.net/10012/7518.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ives, Jessica. “Isotopic niche use by the invasive mysid Hemimysis anomala in the Laurentian Great Lakes basin.” 2013. Web. 11 Apr 2021.

Vancouver:

Ives J. Isotopic niche use by the invasive mysid Hemimysis anomala in the Laurentian Great Lakes basin. [Internet] [Thesis]. University of Waterloo; 2013. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10012/7518.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ives J. Isotopic niche use by the invasive mysid Hemimysis anomala in the Laurentian Great Lakes basin. [Thesis]. University of Waterloo; 2013. Available from: http://hdl.handle.net/10012/7518

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Queens University

5. Poulopoulos, John. Long-term changes to food web structures and mercury biomagnification in three large, inland North American lakes .

Degree: Biology, 2013, Queens University

URL: http://hdl.handle.net/1974/7782

► Numerous anthropogenic disturbances have occurred in large lakes over recent decades. These may alter concentrations of the biomagnifying contaminant mercury (Hg) in fish, but long-term… (more)

▼ Numerous anthropogenic disturbances have occurred in large lakes over recent decades. These may alter concentrations of the biomagnifying contaminant mercury (Hg) in fish, but long-term impacts of disturbances on Hg trophodynamics are poorly understood. Elemental analyses of archived museum ichthyology specimens could be used to study historical, pre-disturbance fish food webs, but there is uncertainty about effects of chemical preservatives on the results of such analyses. In this thesis, long-term preservation effects were studied, and archived fish were used to reconstruct historical food webs and Hg trophodynamic patterns in three large North American lakes, Nipigon, Simcoe and Champlain. After 24 months of formalin/ethanol preservation, fish muscle delta-15N and delta-13C had average changes of +0.4 ‰ and -0.9 ‰, respectively. Shifts in mean Hg concentration was +5 % after 12 months. A suite of 26 other elements analyzed over 24 months showed consistent responses to preservation, usually involving an increase in concentration immediately following preservation. In the second phase of the thesis, stable isotope and Hg analyses were performed on archived and modern fish from the study lakes, dating to the 1920s-60s and 2006-7, respectively. Trophic relationships were often relatively stable over time, but stable isotope metrics revealed a decrease in Lake Nipigon delta-15N range and less pelagic feeding among Lake Simcoe pumpkinseed and yellow perch. In Lake Champlain, the re-introduction of lake trout in recent decades did not have a major effect on overall food web dimensions. Significant Hg biomagnification factors were found in 1920s and 2006-7 Lake Nipigon (which were not statistically distinguishable from each other) and 2006 Lake Champlain. These biomagnification factors ranged from 0.09 to 0.17, which is within the range found in other studies globally. Archived fish and government monitoring records indicated that fish Hg concentrations decreased in Lakes Simcoe and Champlain since historical periods, but remained similar or increased in Lake Nipigon. This thesis confirms the utility of archived fish for elemental analyses. It highlights the risks of Hg contamination and food web change that may be faced by remote lakes, and it provides evidence for relatively stable Hg biomagnification rates in large lakes.

Subjects/Keywords: food web ; museum ; stable isotopes ; preservation ; mercury

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APA (6^th Edition):

Poulopoulos, J. (2013). Long-term changes to food web structures and mercury biomagnification in three large, inland North American lakes . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/7782

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Poulopoulos, John. “Long-term changes to food web structures and mercury biomagnification in three large, inland North American lakes .” 2013. Thesis, Queens University. Accessed April 11, 2021. http://hdl.handle.net/1974/7782.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Poulopoulos, John. “Long-term changes to food web structures and mercury biomagnification in three large, inland North American lakes .” 2013. Web. 11 Apr 2021.

Vancouver:

Poulopoulos J. Long-term changes to food web structures and mercury biomagnification in three large, inland North American lakes . [Internet] [Thesis]. Queens University; 2013. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1974/7782.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Poulopoulos J. Long-term changes to food web structures and mercury biomagnification in three large, inland North American lakes . [Thesis]. Queens University; 2013. Available from: http://hdl.handle.net/1974/7782

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Montana Tech

6. Staats, Molly Frances. FACTORS AFFECTING MERCURY BIOMAGNIFICATION IN RIVERINE FOOD WEBS IN THE ROCKY MOUNTAINS: CLARK FORK RIVER BASIN, MONTANA, U.S.A.

Degree: MS, 2011, Montana Tech

URL: https://scholarworks.umt.edu/etd/1328

► A number of studies suggest that Hg biomagnification in aquatic systems are dependent on two factors: a source of mercury and the potential for this… (more)

Subjects/Keywords: biomagnification; food web; mercury; mercuy methylation; wetlands

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APA (6^th Edition):

Staats, M. F. (2011). FACTORS AFFECTING MERCURY BIOMAGNIFICATION IN RIVERINE FOOD WEBS IN THE ROCKY MOUNTAINS: CLARK FORK RIVER BASIN, MONTANA, U.S.A. (Masters Thesis). Montana Tech. Retrieved from https://scholarworks.umt.edu/etd/1328

Chicago Manual of Style (16^th Edition):

Staats, Molly Frances. “FACTORS AFFECTING MERCURY BIOMAGNIFICATION IN RIVERINE FOOD WEBS IN THE ROCKY MOUNTAINS: CLARK FORK RIVER BASIN, MONTANA, U.S.A.” 2011. Masters Thesis, Montana Tech. Accessed April 11, 2021. https://scholarworks.umt.edu/etd/1328.

MLA Handbook (7^th Edition):

Staats, Molly Frances. “FACTORS AFFECTING MERCURY BIOMAGNIFICATION IN RIVERINE FOOD WEBS IN THE ROCKY MOUNTAINS: CLARK FORK RIVER BASIN, MONTANA, U.S.A.” 2011. Web. 11 Apr 2021.

Vancouver:

Staats MF. FACTORS AFFECTING MERCURY BIOMAGNIFICATION IN RIVERINE FOOD WEBS IN THE ROCKY MOUNTAINS: CLARK FORK RIVER BASIN, MONTANA, U.S.A. [Internet] [Masters thesis]. Montana Tech; 2011. [cited 2021 Apr 11]. Available from: https://scholarworks.umt.edu/etd/1328.

Council of Science Editors:

Staats MF. FACTORS AFFECTING MERCURY BIOMAGNIFICATION IN RIVERINE FOOD WEBS IN THE ROCKY MOUNTAINS: CLARK FORK RIVER BASIN, MONTANA, U.S.A. [Masters Thesis]. Montana Tech; 2011. Available from: https://scholarworks.umt.edu/etd/1328

University of Oklahoma

7. Lucas, Jane. FROM COOPERATION TO COMPETITION: HOW MICROBES AND INVERTEBRATES INTERACT IN A TROPICAL FOREST.

Degree: PhD, 2018, University of Oklahoma

URL: http://hdl.handle.net/11244/299325

► Microbes and invertebrates are “the little things that run the world” (Wilson 1987, Moreau 2017), but the intricacies of how these organisms impact our environment… (more)

Subjects/Keywords: Ecology; Microbial Ecology; Invertebrate; Brown Food Web

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APA (6^th Edition):

Lucas, J. (2018). FROM COOPERATION TO COMPETITION: HOW MICROBES AND INVERTEBRATES INTERACT IN A TROPICAL FOREST. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/299325

Chicago Manual of Style (16^th Edition):

Lucas, Jane. “FROM COOPERATION TO COMPETITION: HOW MICROBES AND INVERTEBRATES INTERACT IN A TROPICAL FOREST.” 2018. Doctoral Dissertation, University of Oklahoma. Accessed April 11, 2021. http://hdl.handle.net/11244/299325.

MLA Handbook (7^th Edition):

Lucas, Jane. “FROM COOPERATION TO COMPETITION: HOW MICROBES AND INVERTEBRATES INTERACT IN A TROPICAL FOREST.” 2018. Web. 11 Apr 2021.

Vancouver:

Lucas J. FROM COOPERATION TO COMPETITION: HOW MICROBES AND INVERTEBRATES INTERACT IN A TROPICAL FOREST. [Internet] [Doctoral dissertation]. University of Oklahoma; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/11244/299325.

Council of Science Editors:

Lucas J. FROM COOPERATION TO COMPETITION: HOW MICROBES AND INVERTEBRATES INTERACT IN A TROPICAL FOREST. [Doctoral Dissertation]. University of Oklahoma; 2018. Available from: http://hdl.handle.net/11244/299325

University of Saskatchewan

8. Graves, Stephanie D. Selenium uptake, trophic transfer, and toxicity in boreal lake ecosystems.

Degree: 2020, University of Saskatchewan

URL: http://hdl.handle.net/10388/13199

► Selenium (Se) is emerging as a contaminant of concern, particularly in mine and agriculture influenced areas of Canada and the United States. Due to the… (more)

▼ Selenium (Se) is emerging as a contaminant of concern, particularly in mine and agriculture influenced areas of Canada and the United States. Due to the high site- and species-specificity of Se bioaccumulation, site-specific biodynamic modelling is the accepted approach to predict Se accumulation in aquatic systems, and fish tissue-based guidelines for the protection of aquatic life are preferred over water quality guidelines. To date, few studies have assessed Se bioaccumulation in cold-water systems, such as Canadian boreal forest lakes. These lakes, which comprise a large proportion of Canada’s freshwater, are also associated with several anthropogenic activities that can contribute to the excess release of Se to aquatic systems. Further, concern about excess Se has generally focused on the teratogenic effects on egg-laying vertebrates, with relatively little attention paid to aquatic invertebrates. The goal of this research was to improve the current understanding of Se biodynamics and toxicity in Canadian boreal lakes, with the ultimate goal of informing future ecological risk assessments of Se in Canada. Limnocorrals in two lakes located at the International Institute for Sustainable Development – Experimental Lakes Area (IISD-ELA) were used to conduct small scale whole-ecosystem experiments to study bioaccumulation and toxicity of Se. In 2017, Se was added as selenite to six limnocorrals (two treatment groups, each in triplicate) to achieve mean measured water Se concentrations of 1.0 and 8.9 µg/L and three limnocorrals were untreated controls (mean measured Se = 0.12 µg/L). Distribution coefficients (kds) ranged from 7,772 L/kg dry mass (dm) in the 8.9 µg/L treatment to 23,495 L/kg dm in the 0.12 µg/L treatment, and trophic transfer factors (TTFs) for benthic macroinvertebrates ranged from 0.49 for Gammaridae to 2.3 for Chironomidae. Selenium accumulated in fathead minnow ovaries to concentrations near or above the current British Columbia Ministry of the Environment and US Environmental Protection Agency criteria (11 and 15.1 µg/g dm for fish ovary/egg, respectively) in the 1.0 and 8.9 µg/L treatments. Chironomidae and Gammaridae densities and biomass were significantly lower in the 8.9 µg/L Se treatment relative to the 1.0 µg/L Se treatment and the control, and invertebrate diversity significantly declined in the 1.0 µg/L and 8.9 µg/L Se treatments relative to the control (0.12 µg/L Se group). In 2018, a gradient approach was used in which three limnocorrals were controls (0.08-0.09 µg Se/L), and mean measured concentrations in Se-treated limnocorrals were 0.4, 0.8, 1.6, 3.4, 5.6, and 7.9 µg/L. Total Se (TSe) bioaccumulation by organisms was generally non-linear over the gradient of water Se concentrations used, and taxonomic differences in TSe accumulation by algae (phytoplankton < periphyton) and invertebrates (Heptageniidae = Chironomidae > zooplankton) were observed. Zooplankton and benthic macroinvertebrate communities shifted according to Se exposure. Cladocera and Heptageniidae biomass and density… Advisors/Committee Members: Janz, David, Weber, Lynn, Baulch, Helen, Liber, Karsten, Hecker, Markus, Palace, Vince.

Subjects/Keywords: selenium; food web; mesocosm; ecotoxicology; bioaccumulation

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APA (6^th Edition):

Graves, S. D. (2020). Selenium uptake, trophic transfer, and toxicity in boreal lake ecosystems. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/13199

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Graves, Stephanie D. “Selenium uptake, trophic transfer, and toxicity in boreal lake ecosystems.” 2020. Thesis, University of Saskatchewan. Accessed April 11, 2021. http://hdl.handle.net/10388/13199.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Graves, Stephanie D. “Selenium uptake, trophic transfer, and toxicity in boreal lake ecosystems.” 2020. Web. 11 Apr 2021.

Vancouver:

Graves SD. Selenium uptake, trophic transfer, and toxicity in boreal lake ecosystems. [Internet] [Thesis]. University of Saskatchewan; 2020. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10388/13199.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Graves SD. Selenium uptake, trophic transfer, and toxicity in boreal lake ecosystems. [Thesis]. University of Saskatchewan; 2020. Available from: http://hdl.handle.net/10388/13199

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Canterbury

9. Wootton, Katherine Lindsay. Fitting species into the complexity-stability debate.

Degree: MS, Biological Sciences, 2015, University of Canterbury

URL: http://dx.doi.org/10.26021/5965

► Ecological communities – groups of interacting species – are subject to a variety of disturbances. Understanding responses to these disturbances is a primary goal of… (more)

▼ Ecological communities – groups of interacting species – are subject to a variety of disturbances. Understanding responses to these disturbances is a primary goal of community ecology. The structural complexity of the community and the traits of the community’s constituent species are both known to have a significant impact on a community’s response to a disturbance. In this thesis, we investigated how these two scales – the community level and the species level – interactively affected community responses to both short and long term disturbances. Our first hypothesis was that interaction strength would be weaker in species with many interactions when compared to species with fewer interactions. To test this hypothesis, we used simulated food webs and found that, in locally stable food webs, species with many interactions tended predominantly to have interactions with predators or with prey. While these many predator or prey interactions were weak, they tended to be balanced by a few interactions of the opposite type (with prey or predators) which were stronger than average. The structure of the network, where species had predominantly one type of interaction, was essential for this relationship between the number and strength of interactions to arise. Our second study investigated how food webs of varying size and connectance respond to press and pulse disturbances. Many studies of food web stability only focus on the response to short term or “pulse” disturbances, however, as anthropogenic impacts on food webs increase, it is important to increase our understanding of food web responses to long term or “press” disturbances and determine whether they follow the same pattern as pulse disturbances. We found that more species rich and connected food webs were less stable to both types of disturbance and the more stable a food web was to a pulse disturbance, the more stable it was to a press disturbance as well. We also found that the traits – trophic level and number of interactions – of the disturbed species impacted a food web’s resistance to a press disturbance. Food webs were less resistant to the disturbance of species with many interactions or low trophic level than species with few interactions or high trophic level. The strength of species’ effects on stability was also moderated by the structural complexity of the food web. Together the work that makes up this thesis suggests that, to understand the stability of food webs to any kind of disturbance, we should consider both the structure of the network and the traits of the species embedded within it. While we found that networks were more vulnerable to disturbance of certain species than others, this observation also depended on the structure and complexity of the community they existed in. This has important implications for communities subject to disturbances, especially those disturbances which alter the way in which communities are structured and species interact.

Subjects/Keywords: species interactions; food web; stability; complexity; disturbance

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APA (6^th Edition):

Wootton, K. L. (2015). Fitting species into the complexity-stability debate. (Masters Thesis). University of Canterbury. Retrieved from http://dx.doi.org/10.26021/5965

Chicago Manual of Style (16^th Edition):

Wootton, Katherine Lindsay. “Fitting species into the complexity-stability debate.” 2015. Masters Thesis, University of Canterbury. Accessed April 11, 2021. http://dx.doi.org/10.26021/5965.

MLA Handbook (7^th Edition):

Wootton, Katherine Lindsay. “Fitting species into the complexity-stability debate.” 2015. Web. 11 Apr 2021.

Vancouver:

Wootton KL. Fitting species into the complexity-stability debate. [Internet] [Masters thesis]. University of Canterbury; 2015. [cited 2021 Apr 11]. Available from: http://dx.doi.org/10.26021/5965.

Council of Science Editors:

Wootton KL. Fitting species into the complexity-stability debate. [Masters Thesis]. University of Canterbury; 2015. Available from: http://dx.doi.org/10.26021/5965

University of Canterbury

10. Peralta, Guadalupe. Food webs from natural to production forests: composition, phylogeny and functioning.

Degree: PhD, Ecology, 2013, University of Canterbury

URL: http://dx.doi.org/10.26021/7220

► Habitat loss and fragmentation have been identified as the main drivers of biodiversity loss. These drivers increase the proportion of habitat edges and change the… (more)

▼ Habitat loss and fragmentation have been identified as the main drivers of biodiversity loss. These drivers increase the proportion of habitat edges and change the configuration of landscapes. Habitat edges are known to affect ecological patterns and processes, however, is still unknown how these boundaries affect the assemblage of interactions among species within a community, and particularly its structure. Food webs depict not only the composition of the community, but also the feeding links, which represent a measure of energy flow. Therefore, they can inform about the relationships among community diversity, stability, and ecosystem functions. This thesis explores the effects of habitat edges across native vs. managed forests on the food web of a tri-trophic system comprising plants, herbivores (Lepidoptera larvae) and predators (parasitoids). Particularly, it addresses three main objectives: 1) how food webs at habitat edges are assembled from the species and interactions present in the adjoining habitats; 2) how phylogenetic diversity and the coevolutionary signal among interacting species change across a habitat edge gradient; and 3) whether the mechanisms driving community-wide consumption rates and the ecosystem service of pest control are related to structural characteristics of the food webs. The key findings of this thesis are that, despite the composition of species and interactions of native and managed habitats merging at their interface, food-web structure did not arise as a simple combination of its adjacent habitat webs, potentially due to differential responses of organisms to habitat edges. Moreover, beyond taxonomic composition, the phylogenetic diversity and signal of coevolution among interacting species also change between habitat types, even though this did not translate to changes in consumption rates. Consumption rates and their stability increased with complementarity and redundancy in resource-use among predators. This reflects how environmental changes such as habitat fragmentation can have an effect beyond composition per se, affecting the assemblage of species interactions and even potentially interfering with natural evolutionary processes. Therefore, using interaction-network approaches for determining the impacts of changes may shed light on the underlying mechanisms driving such changes, and help to develop landscape management plans that reduce negative effects on species assemblages.

Subjects/Keywords: food web; fragmentation; habitat edges; phylogenetic diversity; coevolutionary signal; ecosystem functioning; food-web structure

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Peralta, G. (2013). Food webs from natural to production forests: composition, phylogeny and functioning. (Doctoral Dissertation). University of Canterbury. Retrieved from http://dx.doi.org/10.26021/7220

Chicago Manual of Style (16^th Edition):

Peralta, Guadalupe. “Food webs from natural to production forests: composition, phylogeny and functioning.” 2013. Doctoral Dissertation, University of Canterbury. Accessed April 11, 2021. http://dx.doi.org/10.26021/7220.

MLA Handbook (7^th Edition):

Peralta, Guadalupe. “Food webs from natural to production forests: composition, phylogeny and functioning.” 2013. Web. 11 Apr 2021.

Vancouver:

Peralta G. Food webs from natural to production forests: composition, phylogeny and functioning. [Internet] [Doctoral dissertation]. University of Canterbury; 2013. [cited 2021 Apr 11]. Available from: http://dx.doi.org/10.26021/7220.

Council of Science Editors:

Peralta G. Food webs from natural to production forests: composition, phylogeny and functioning. [Doctoral Dissertation]. University of Canterbury; 2013. Available from: http://dx.doi.org/10.26021/7220

University of Otago

11. Hussein, Areege Hassan. A web-based dietary assessment method for exploring iron bioavailability: developing a food list and pretesting .

Degree: 2014, University of Otago

URL: http://hdl.handle.net/10523/4626

► Iron deficiency is the most common nutrient disorder worldwide. To assess intake in a population, food frequency questionnaires (FFQs) are commonly used as a low-burden,… (more)

Subjects/Keywords: Web-MBIAT; Web-Meal Based Intake Assessment Tool; Food frequency questionnaire; iron; pretesting

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APA (6^th Edition):

Hussein, A. H. (2014). A web-based dietary assessment method for exploring iron bioavailability: developing a food list and pretesting . (Masters Thesis). University of Otago. Retrieved from http://hdl.handle.net/10523/4626

Chicago Manual of Style (16^th Edition):

Hussein, Areege Hassan. “A web-based dietary assessment method for exploring iron bioavailability: developing a food list and pretesting .” 2014. Masters Thesis, University of Otago. Accessed April 11, 2021. http://hdl.handle.net/10523/4626.

MLA Handbook (7^th Edition):

Hussein, Areege Hassan. “A web-based dietary assessment method for exploring iron bioavailability: developing a food list and pretesting .” 2014. Web. 11 Apr 2021.

Vancouver:

Hussein AH. A web-based dietary assessment method for exploring iron bioavailability: developing a food list and pretesting . [Internet] [Masters thesis]. University of Otago; 2014. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10523/4626.

Council of Science Editors:

Hussein AH. A web-based dietary assessment method for exploring iron bioavailability: developing a food list and pretesting . [Masters Thesis]. University of Otago; 2014. Available from: http://hdl.handle.net/10523/4626

NSYSU

12. Chang, Chih-Hsien. The biology of the snail Cerithium zonatum in an intertidal zone of Green Island.

Degree: Master, Marine Biology, 2010, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0908110-093906

► Cerithium zonatum is a dominate species in an intertidal zone of Shi-Lang, Green Island. This study aimed to characterize the population dynamics, reproduction and trophic… (more)

Subjects/Keywords: reproduction; population dynamics; isotope; Cerithium zonatum; food web

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APA (6^th Edition):

Chang, C. (2010). The biology of the snail Cerithium zonatum in an intertidal zone of Green Island. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0908110-093906

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chang, Chih-Hsien. “The biology of the snail Cerithium zonatum in an intertidal zone of Green Island.” 2010. Thesis, NSYSU. Accessed April 11, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0908110-093906.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chang, Chih-Hsien. “The biology of the snail Cerithium zonatum in an intertidal zone of Green Island.” 2010. Web. 11 Apr 2021.

Vancouver:

Chang C. The biology of the snail Cerithium zonatum in an intertidal zone of Green Island. [Internet] [Thesis]. NSYSU; 2010. [cited 2021 Apr 11]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0908110-093906.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chang C. The biology of the snail Cerithium zonatum in an intertidal zone of Green Island. [Thesis]. NSYSU; 2010. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0908110-093906

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

13. Merkley, Steven. Resource Quantity and Quality in Cross-Ecosystem Food Web Subsidies.

Degree: Evolution, Ecology and Organismal Biology, 2016, University of California – Riverside

URL: http://www.escholarship.org/uc/item/6gc9g4df

► Prey moving from donor to recipient ecosystems (e.g. freshwater to terrestrial) are known as cross-ecosystem food web subsidies. These prey can affect the distribution and… (more)

▼ Prey moving from donor to recipient ecosystems (e.g. freshwater to terrestrial) are known as cross-ecosystem food web subsidies. These prey can affect the distribution and abundance of subsidized predators. Most investigators have focused on how the quantity of prey (body size and biomass) affect predators, often assuming that resource quantity is an accurate proxy for resource quality. In the present dissertation, I used meta-analysis, lab, and field experiments to show the importance of measuring resource quality and how shifting quality of prey subsidies (insects) can influence a subsidized predator (Tetragnatha sp. spiders). Specifically, I define resource quality as a function of body nutrient content (%N) and carbon:nitrogen (C:N) ratio. In chapter two using data from 30 studies and ~250 effect sizes, I performed meta-analyses and demonstrated that increases in metrics of resource quantity (body size and dry weight) are not synonymous with increases in metrics of resource quality. In fact, there was a negative correlation between body phosphorus content (%P) and resource quantity. In chapter three, I tested how terrestrial spiders (Tetragnatha nitens) responded to different levels of prey quality by rearing them on three different prey: midges (Chironomus dilutus), mosquitoes (Culex quinquefasciatus), and fruit flies (Drosophila melanogaster). Mosquitoes were the lowest quality resource and lowered the nutrient content and stoichiometry of spider predators compared to the other treatments. Spiders fed on mosquitoes also suffered delays in growth and development due to being fed on the lower quality resource. Lastly, in chapter four, I tested how terrestrial spiders (Tetragnatha sp.) were affected by an aquatic nutrient enrichment in experimental field mesocosms. Abundance, body size (tibia + patella length (TPL) of first walking leg) (mm), biomass (mg), or nutrient stoichiometry (C:N ratio) of the subsidized Tetragnatha sp. spider did not differ significantly between enriched and non-enriched pools. However, significantly higher nitrogen content (% body N) was in Tetragnatha sp. spiders from the Santa Ana River inflow in a constructed treatment wetland compared to a site farther along this aquatic nutrient gradient during July 2015. Nutrient enrichment of the aquatic ecosystem due to anthropogenic runoff during a summer monsoon event may explain this pattern.

Subjects/Keywords: Ecology; Food web subsidies; Nutrient stoichiometry; Resource quality; Spiders; Stable Isotopes

11 more images…

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APA (6^th Edition):

Merkley, S. (2016). Resource Quantity and Quality in Cross-Ecosystem Food Web Subsidies. (Thesis). University of California – Riverside. Retrieved from http://www.escholarship.org/uc/item/6gc9g4df

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Merkley, Steven. “Resource Quantity and Quality in Cross-Ecosystem Food Web Subsidies.” 2016. Thesis, University of California – Riverside. Accessed April 11, 2021. http://www.escholarship.org/uc/item/6gc9g4df.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Merkley, Steven. “Resource Quantity and Quality in Cross-Ecosystem Food Web Subsidies.” 2016. Web. 11 Apr 2021.

Vancouver:

Merkley S. Resource Quantity and Quality in Cross-Ecosystem Food Web Subsidies. [Internet] [Thesis]. University of California – Riverside; 2016. [cited 2021 Apr 11]. Available from: http://www.escholarship.org/uc/item/6gc9g4df.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Merkley S. Resource Quantity and Quality in Cross-Ecosystem Food Web Subsidies. [Thesis]. University of California – Riverside; 2016. Available from: http://www.escholarship.org/uc/item/6gc9g4df

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California – Riverside

14. Tobin, Jennifer Marie. Selenium Partitioning and Food-Chain Transfer at the Salton Sea.

Degree: Environmental Sciences, 2011, University of California – Riverside

URL: http://www.escholarship.org/uc/item/40r8t899

► With the habitat at the Salton Sea, California, expected to decline to conditions unsuitable for wildlife as the Sea shrinks in coming years, efforts are… (more)

Subjects/Keywords: Environmental science; Food web; Modeling; Salton Sea; Selenium

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APA (6^th Edition):

Tobin, J. M. (2011). Selenium Partitioning and Food-Chain Transfer at the Salton Sea. (Thesis). University of California – Riverside. Retrieved from http://www.escholarship.org/uc/item/40r8t899

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tobin, Jennifer Marie. “Selenium Partitioning and Food-Chain Transfer at the Salton Sea.” 2011. Thesis, University of California – Riverside. Accessed April 11, 2021. http://www.escholarship.org/uc/item/40r8t899.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tobin, Jennifer Marie. “Selenium Partitioning and Food-Chain Transfer at the Salton Sea.” 2011. Web. 11 Apr 2021.

Vancouver:

Tobin JM. Selenium Partitioning and Food-Chain Transfer at the Salton Sea. [Internet] [Thesis]. University of California – Riverside; 2011. [cited 2021 Apr 11]. Available from: http://www.escholarship.org/uc/item/40r8t899.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tobin JM. Selenium Partitioning and Food-Chain Transfer at the Salton Sea. [Thesis]. University of California – Riverside; 2011. Available from: http://www.escholarship.org/uc/item/40r8t899

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Tasmania

15. Liao, JS. Using Web 2.0 to enhance SME agri-food supply chain management: a Tasmanian study.

Degree: 2013, University of Tasmania

URL: https://eprints.utas.edu.au/17542/1/Whole-Liao%2C_Junheng_thesis.pdf

► This research project investigates the potential for Web 2.0 techniques (in this context, social media and websites using very accessible and scalable publishing techniques) to… (more)

▼ This research project investigates the potential for Web 2.0 techniques (in this context, social media and websites using very accessible and scalable publishing techniques) to support and enhance agri-food supply chains within the Australian State of Tasmania. The research is based on three major areas of focus: agricultural and food supply chains (agri-food supply chains); small and medium size enterprises (SMEs) in these supply chains; and Web 2.0. To achieve a representative outcome, both quantitative and qualitative data were gathered from a number of sub-sectors comprising seafood, dairy, livestock, fruit and vegetable. The empirical research process made use of three data gathering stages: 10 key informant interviews to gather expert opinion prior to broader data collection, followed by a survey of 28 Tasmanian primary producers and, after refinement of the initial model, a validation focus group. Since the majority of the interviewees had only limited familiarity with Web 2.0, a ‘typical’ Web 2.0 prototype was developed and presented during the survey interviews, allowing participants to trial the Web 2.0 application in a supply chain management (SCM) environment without risking their real businesses. The results indicate the widespread popular view of the prevalence of Internet use. The majority of interviewees had also used some types of Web 2.0 technologies, although only a limited number of participants had used this sort of ICT at a sophisticated level – most interviewees used the Internet simply to obtain information, rather than actively engaging in content contribution. In particular, few of these SMEs had applied Web 2.0 to their agribusinesses, or to their supply chain activities. This situation is starting to change, however, as fragmentary Web 2.0 SCM applications begin to appear in many key areas of supply chain management including: procurement, processing and inventory management, marketing and sales, transport and customer service, as well as in all the sub-sectors investigated – some of them as a result of involvement in this project. One fisherman even developed his own iPhone app with record keeping and traceability functions for his fishing business. The outcomes of this project suggest that applying Web 2.0 to SCM is not only driven by economic benefit, but also by lifestyle enhancement. Perceived effort expectancy, communication quality enhancement and social & other external factors also have significant effects on the adoption decision. Moreover, the degree of those perceptions also differs by gender (though, interestingly, it was the female participants who were most techno-savvy), age, customer types and technology experience – although the relatively small size of the sample means that some of these interactions will require further testing before their generalisability can be confirmed. Interestingly, the moderating effects of gender and age are diminishing as technology becomes more readily available and easier to use – and as Information Technology literacy becomes more…

Subjects/Keywords: Web 2.0; Agri-food; SMEs; supply chain management; Tasmania

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APA (6^th Edition):

Liao, J. (2013). Using Web 2.0 to enhance SME agri-food supply chain management: a Tasmanian study. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/17542/1/Whole-Liao%2C_Junheng_thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Liao, JS. “Using Web 2.0 to enhance SME agri-food supply chain management: a Tasmanian study.” 2013. Thesis, University of Tasmania. Accessed April 11, 2021. https://eprints.utas.edu.au/17542/1/Whole-Liao%2C_Junheng_thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Liao, JS. “Using Web 2.0 to enhance SME agri-food supply chain management: a Tasmanian study.” 2013. Web. 11 Apr 2021.

Vancouver:

Liao J. Using Web 2.0 to enhance SME agri-food supply chain management: a Tasmanian study. [Internet] [Thesis]. University of Tasmania; 2013. [cited 2021 Apr 11]. Available from: https://eprints.utas.edu.au/17542/1/Whole-Liao%2C_Junheng_thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liao J. Using Web 2.0 to enhance SME agri-food supply chain management: a Tasmanian study. [Thesis]. University of Tasmania; 2013. Available from: https://eprints.utas.edu.au/17542/1/Whole-Liao%2C_Junheng_thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Cornell University

16. Holeck, Kristen. Investigating Lake Ontario’S Lower Food Web: Spatial Variation And Temporal Trends In Water Clarity, Phosphorus, Silica, Chlorophyll-A And Zooplankton.

Degree: M.S., Natural Resources, Natural Resources, 2016, Cornell University

URL: http://hdl.handle.net/1813/45254

Subjects/Keywords: Lake Ontario; oligotrophication; food web

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APA (6^th Edition):

Holeck, K. (2016). Investigating Lake Ontario’S Lower Food Web: Spatial Variation And Temporal Trends In Water Clarity, Phosphorus, Silica, Chlorophyll-A And Zooplankton. (Masters Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/45254

Chicago Manual of Style (16^th Edition):

Holeck, Kristen. “Investigating Lake Ontario’S Lower Food Web: Spatial Variation And Temporal Trends In Water Clarity, Phosphorus, Silica, Chlorophyll-A And Zooplankton.” 2016. Masters Thesis, Cornell University. Accessed April 11, 2021. http://hdl.handle.net/1813/45254.

MLA Handbook (7^th Edition):

Holeck, Kristen. “Investigating Lake Ontario’S Lower Food Web: Spatial Variation And Temporal Trends In Water Clarity, Phosphorus, Silica, Chlorophyll-A And Zooplankton.” 2016. Web. 11 Apr 2021.

Vancouver:

Holeck K. Investigating Lake Ontario’S Lower Food Web: Spatial Variation And Temporal Trends In Water Clarity, Phosphorus, Silica, Chlorophyll-A And Zooplankton. [Internet] [Masters thesis]. Cornell University; 2016. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1813/45254.

Council of Science Editors:

Holeck K. Investigating Lake Ontario’S Lower Food Web: Spatial Variation And Temporal Trends In Water Clarity, Phosphorus, Silica, Chlorophyll-A And Zooplankton. [Masters Thesis]. Cornell University; 2016. Available from: http://hdl.handle.net/1813/45254

Texas A&M University

17. 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 (6^th 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 (16^th 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 April 11, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-1971.

MLA Handbook (7^th 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. 11 Apr 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 Apr 11]. 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

University of Tasmania

18. Jia, Z. Surviving under the Antarctic sea ice : a study of the feeding ecology of Antarctic krill.

Degree: 2016, University of Tasmania

URL: https://eprints.utas.edu.au/23059/1/Jai_whole_thesis.pdf

► Antarctic sea ice covers approximately 4 million km2 during minimum extent in February/ March and grows to 19 million km2 during maximum extent in September/October.… (more)

▼ Antarctic sea ice covers approximately 4 million km2 during minimum extent in February/ March and grows to 19 million km2 during maximum extent in September/October. This sea ice zone harbours a wide diversity of biota and supports large populations of unique Antarctic organisms. During the satellite era, Antarctic sea ice has shown strong regional changes in its extent, duration, and the timing of the annual advance and retreat. Improving our understanding of the relationships between sea ice and ice associated animals will fill a crucial knowledge gap, which will facilitate the conservation and management of the Southern Ocean ecosystems and resources. This thesis compiles three studies focusing on the feeding ecology of Antarctic ice associated zooplankton during the winter-spring transition. This work concentrates on Antarctic krill (Euphausia superba), a key species with ecological and commercial significance in Southern Ocean ecosystems. Morphology defines an animal’s feeding capability. The morphological changes through ontogeny of a species thus are not only important taxonomic information, but also crucial for our understanding regarding its feeding ecology. In Chapter 2, I describe the morphological changes of E. superba through its development from an egg to juvenile. This is the first study since 1936 that fully describes the morphological features of this species, in which I update the existent knowledge with details and high-resolution photographs. Intermediate larval stages are identified and these morphological characteristics are related to the overwintering survival strategies for this species. The food that animals actually obtain from the environment can be investigated with either gut content or biochemical analyses. To determine the dietary preferences and trophic relationships of major zooplankton species (Chapter 3), I use stable isotope analyses (13C/12C and 15N/14N) to compare samples collected from East Antarctic pack ice zone during two winter-spring transitions (2007 and 2012). Interannual dietary differences are determined for larval E. superba, suggesting feeding plasticity, which enables this species to adapt to changing environmental conditions. Larval E. superba are primarily herbivorous while utilising sea-ice biota, and consume a more heterotrophic diet when feeding from the water column. In contrast, post-larval E. superba, and the omnivorous krill Thysanoessa macrura consume a mixed diet from both the water column and the sea ice. The pteropod Limacina helicina, small copepods in the genus Oithona spp., ostracods and amphipods rely heavily on sea-ice biota according to their carbon isotope ratios. Large copepods and chaetognaths consume a water column-based diet during the winter. The comparison of isotopic profiles between years suggests that ice-associated zooplankton gain access to sea-ice biota more easily under warm and permeable ice than under cold ice. Our ability to construct food web models for sea-ice ecosystems are restricted by…

Subjects/Keywords: Antarctic krill; sea ice; zooplankton ecology; stable isotope; food web modelling

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APA (6^th Edition):

Jia, Z. (2016). Surviving under the Antarctic sea ice : a study of the feeding ecology of Antarctic krill. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/23059/1/Jai_whole_thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jia, Z. “Surviving under the Antarctic sea ice : a study of the feeding ecology of Antarctic krill.” 2016. Thesis, University of Tasmania. Accessed April 11, 2021. https://eprints.utas.edu.au/23059/1/Jai_whole_thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jia, Z. “Surviving under the Antarctic sea ice : a study of the feeding ecology of Antarctic krill.” 2016. Web. 11 Apr 2021.

Vancouver:

Jia Z. Surviving under the Antarctic sea ice : a study of the feeding ecology of Antarctic krill. [Internet] [Thesis]. University of Tasmania; 2016. [cited 2021 Apr 11]. Available from: https://eprints.utas.edu.au/23059/1/Jai_whole_thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jia Z. Surviving under the Antarctic sea ice : a study of the feeding ecology of Antarctic krill. [Thesis]. University of Tasmania; 2016. Available from: https://eprints.utas.edu.au/23059/1/Jai_whole_thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of California – San Diego

19. Hetherington, Elizabeth. The interplay between trophic ecology, environmental variability, and an endangered marine species.

Degree: Biology, 2018, University of California – San Diego

URL: http://www.escholarship.org/uc/item/73j4n80z

► A grand challenge of the 21st century is to understand the response of ecosystems and populations of species to environmental variability and intensifying climate change.… (more)

▼ A grand challenge of the 21st century is to understand the response of ecosystems and populations of species to environmental variability and intensifying climate change. My dissertation focuses on the potential for changing environmental conditions to influence marine food webs, foraging ecology, and ultimately population success of consumers. I combined biogeochemical tools (stable isotope analyses) of zooplankton and endangered leatherback turtles with measures of oceanography and environmental conditions to evaluate changes in foraging ecology and food web dynamics over time. My research specifically focuses on long-term trends in the foraging ecology and habitat use of Atlantic and Pacific leatherback turtles and how environmental variability in the Pacific may alter food web dynamics in a critical foraging area for a declining leatherback population. My first two chapters were focused on leatherback turtles, a cosmopolitan species with populations inhabiting tropical and temperate regions throughout the global ocean. In Chapter 1, I examined the trophic ecology of North Atlantic leatherbacks over an eighteen-year period to test the hypothesis that shifts in foraging ecology or environmental conditions in the North Atlantic have contributed to leatherback population recovery. In Chapter 2, I focused on a subgroup of the critically endangered Western Pacific leatherback population that forages in the California Current. Here, I addressed questions about their diet, habitat use, and the trophic structure of leatherback prey in the California Current Large Marine Ecosystem (CCLME). These two chapters allowed me to better understand whether the continuing decline of Pacific leatherbacks was related to dietary differences potentially driven by variability in environmental conditions between ocean basins as the North Atlantic population of turtles are steadily increasing. In Chapter 3, I investigated ecosystem responses to a multi-year, warm water anomaly (a marine heatwave and strong El Niño event) in the CCLME, which is a productive upwelling system that supports the biomass of many commercially and ecologically important species, including the leatherback population that Chapter 2 focused on. My findings illustrate mechanisms through which the amount of energy transferred to higher trophic level consumers is altered by environmental variability in the CCLME. In my first three chapters, I used stable isotope analyses, which can be a valuable tool for reconstructing patterns of trophic or foraging ecology over time. However, archived tissues that are used for analyses are often stored in chemical preservatives, which may affect their potential for use in isotope ecology. In Chapter 4, I conducted laboratory experiments to test the effects of common chemical preservatives on stable isotope values to better understand how we can best use preserved and archived tissues in future studies. My research provides insight into the trophic ecology and habitat use of an endangered marine consumer. Although I found no…

Subjects/Keywords: Ecology; El Niño; food web; leatherback turtle; stable isotope; trophic ecology

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APA (6^th Edition):

Hetherington, E. (2018). The interplay between trophic ecology, environmental variability, and an endangered marine species. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/73j4n80z

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hetherington, Elizabeth. “The interplay between trophic ecology, environmental variability, and an endangered marine species.” 2018. Thesis, University of California – San Diego. Accessed April 11, 2021. http://www.escholarship.org/uc/item/73j4n80z.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hetherington, Elizabeth. “The interplay between trophic ecology, environmental variability, and an endangered marine species.” 2018. Web. 11 Apr 2021.

Vancouver:

Hetherington E. The interplay between trophic ecology, environmental variability, and an endangered marine species. [Internet] [Thesis]. University of California – San Diego; 2018. [cited 2021 Apr 11]. Available from: http://www.escholarship.org/uc/item/73j4n80z.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hetherington E. The interplay between trophic ecology, environmental variability, and an endangered marine species. [Thesis]. University of California – San Diego; 2018. Available from: http://www.escholarship.org/uc/item/73j4n80z

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Humboldt State University

20. Best, Michael. Ecological role of the salamander Ensatina eschscholtzii: direct impacts on the arthropod assemblage and indirect influence on the carbon cycle in mixed hardwood/conifer forest in Northwestern California.

Degree: MS, Natural Resources: Wildlife, 2012, Humboldt State University

URL: http://hdl.handle.net/2148/1033

► Terrestrial salamanders are the most abundant vertebrate predators in northwestern California forests, fulfilling a vital role converting invertebrate to vertebrate biomass. The most common of… (more)

Subjects/Keywords: Salamanders; Ensatina; Carbon; Leaf litter; Food web; Trophic cascades; Invertebrates; Plethodontidae

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APA (6^th Edition):

Best, M. (2012). Ecological role of the salamander Ensatina eschscholtzii: direct impacts on the arthropod assemblage and indirect influence on the carbon cycle in mixed hardwood/conifer forest in Northwestern California. (Masters Thesis). Humboldt State University. Retrieved from http://hdl.handle.net/2148/1033

Chicago Manual of Style (16^th Edition):

Best, Michael. “Ecological role of the salamander Ensatina eschscholtzii: direct impacts on the arthropod assemblage and indirect influence on the carbon cycle in mixed hardwood/conifer forest in Northwestern California.” 2012. Masters Thesis, Humboldt State University. Accessed April 11, 2021. http://hdl.handle.net/2148/1033.

MLA Handbook (7^th Edition):

Best, Michael. “Ecological role of the salamander Ensatina eschscholtzii: direct impacts on the arthropod assemblage and indirect influence on the carbon cycle in mixed hardwood/conifer forest in Northwestern California.” 2012. Web. 11 Apr 2021.

Vancouver:

Best M. Ecological role of the salamander Ensatina eschscholtzii: direct impacts on the arthropod assemblage and indirect influence on the carbon cycle in mixed hardwood/conifer forest in Northwestern California. [Internet] [Masters thesis]. Humboldt State University; 2012. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2148/1033.

Council of Science Editors:

Best M. Ecological role of the salamander Ensatina eschscholtzii: direct impacts on the arthropod assemblage and indirect influence on the carbon cycle in mixed hardwood/conifer forest in Northwestern California. [Masters Thesis]. Humboldt State University; 2012. Available from: http://hdl.handle.net/2148/1033

University of Waikato

21. Binks, Nigel. Assessing New Zealand's spider (Araneae) fauna, using DNA barcoding .

Degree: 2018, University of Waikato

URL: http://hdl.handle.net/10289/11963

► The ability to accurately monitor biological diversity is the foundation to most ecological research. However, the morphological identification of spiders, as with many arthropod taxa,… (more)

▼ The ability to accurately monitor biological diversity is the foundation to most ecological research. However, the morphological identification of spiders, as with many arthropod taxa, is often complicated by phenotypic plasticity and sexual dimorphism. New Zealand’s spider fauna is highly endemic (97% of known species), consisting of an estimated 2,000 species. Given such high diversity, it is critical to seek cost-effective measures of assessing species diversity and distributions, and for the identification of cryptic unidentified taxa. The aim of my research was to determine whether the described spider fauna can be effectively delineated from unidentified taxa using DNA barcoding. Overall, I establish a molecular inventory for 100 described species and 71 additional unidentified species of spiders found in New Zealand. Using barcoding I determined there to be 59 native described species and classify 66 of the unidentified species as native, leaving 45 species which were recognised as having international distributions by taxonomic descriptions and/or from comparative DNA sequences from the Barcode of Life Datasystem (www.boldsystems.org). The repository of species presented here represent native species pertaining to 26 families and cosmopolitan species from 17 families of which species from the Araneidae, Linyphiidae and Theridiidae families are the most diversly represented in this study. This foundational inventory was used to assess the presence of spider species around the marginal habitats of 5 Waikato study lakes (Puketi, Rotoiti, Kohahuake, Waiwhakareke and Koraha), in relation to community assemblage variation across lakes, habitat (shoreline vs. pasture) and sampling method. The combined morphological and molecular approach to identification used here has demonstrated community composition assessments of spiders are viable. Furthermore, the study of these community assemblages revealed a greater diversity of habitat specialists among shoreline samples from lakes Kohahuake, Koraha and Waiwhakareke where greater vegetative heterogeneity along the shoreline provides a greater range of niches for spiders to occupy. This compiled species inventory indicates that New Zealand’s diverse Araneae fauna has been infiltrated by species with international distributions. Further, not all species are easily recognisable due to dissimilarities in their morphological appearance, or because they remain to be genetically identified, and therefore the extent of non-native species infiltration into New Zealand ecosystems is unclear. This lack of knowledge highlights an important area for future biosurveillance work. Lake ecosystems were selected for this study because a variety of spider species prey upon adult aquatic invertebrates as they emerge from the aquatic realm and into the terrestrial. Methods which provide complementary data for ranking lake ecosystems is a priority for biodiversity management in the Waikato region due to habitat fragmentation primarily associated with deforestation and subsequent… Advisors/Committee Members: Collier, Kevin J (advisor), Hogg, Ian D (advisor).

Subjects/Keywords: Biodiversity; spider; conservation; lakes; waikato; food-web; community dynamics; barcoding; COI

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Binks, N. (2018). Assessing New Zealand's spider (Araneae) fauna, using DNA barcoding . (Masters Thesis). University of Waikato. Retrieved from http://hdl.handle.net/10289/11963

Chicago Manual of Style (16^th Edition):

Binks, Nigel. “Assessing New Zealand's spider (Araneae) fauna, using DNA barcoding .” 2018. Masters Thesis, University of Waikato. Accessed April 11, 2021. http://hdl.handle.net/10289/11963.

MLA Handbook (7^th Edition):

Binks, Nigel. “Assessing New Zealand's spider (Araneae) fauna, using DNA barcoding .” 2018. Web. 11 Apr 2021.

Vancouver:

Binks N. Assessing New Zealand's spider (Araneae) fauna, using DNA barcoding . [Internet] [Masters thesis]. University of Waikato; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10289/11963.

Council of Science Editors:

Binks N. Assessing New Zealand's spider (Araneae) fauna, using DNA barcoding . [Masters Thesis]. University of Waikato; 2018. Available from: http://hdl.handle.net/10289/11963

Universidade Nova

22. Ye, Zhelu. A Web-Based geographical information system prototype on Portuguese traditional food products.

Degree: 2009, Universidade Nova

URL: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/2318

►

Dissertation submitted in partial fulfilment of the requirements for the Degree of Master of Science in Geospatial Technologies

Portuguese traditional food products use certification labels… (more)

Subjects/Keywords: Open source software; Open specifications; Traditional food products; Web-based GIS

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APA (6^th Edition):

Ye, Z. (2009). A Web-Based geographical information system prototype on Portuguese traditional food products. (Thesis). Universidade Nova. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/2318

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ye, Zhelu. “A Web-Based geographical information system prototype on Portuguese traditional food products.” 2009. Thesis, Universidade Nova. Accessed April 11, 2021. http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/2318.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ye, Zhelu. “A Web-Based geographical information system prototype on Portuguese traditional food products.” 2009. Web. 11 Apr 2021.

Vancouver:

Ye Z. A Web-Based geographical information system prototype on Portuguese traditional food products. [Internet] [Thesis]. Universidade Nova; 2009. [cited 2021 Apr 11]. Available from: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/2318.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ye Z. A Web-Based geographical information system prototype on Portuguese traditional food products. [Thesis]. Universidade Nova; 2009. Available from: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/2318

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

23. Mores, Robin M. Beyond the Binary Web: Using Real-Time PCR to Quantify the Structure of a Spider-Dominated Food Web.

Degree: 2016, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/20939

► Historically, food webs have been depicted as networks of binary interactions that show qualitative structure. Incorporating “weighted” data details interaction strengths and addresses a critique… (more)

Subjects/Keywords: food web; real-time PCR; spiders; predation; forest floor; arthropod community

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APA (6^th Edition):

Mores, R. M. (2016). Beyond the Binary Web: Using Real-Time PCR to Quantify the Structure of a Spider-Dominated Food Web. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/20939

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mores, Robin M. “Beyond the Binary Web: Using Real-Time PCR to Quantify the Structure of a Spider-Dominated Food Web.” 2016. Thesis, University of Illinois – Chicago. Accessed April 11, 2021. http://hdl.handle.net/10027/20939.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mores, Robin M. “Beyond the Binary Web: Using Real-Time PCR to Quantify the Structure of a Spider-Dominated Food Web.” 2016. Web. 11 Apr 2021.

Vancouver:

Mores RM. Beyond the Binary Web: Using Real-Time PCR to Quantify the Structure of a Spider-Dominated Food Web. [Internet] [Thesis]. University of Illinois – Chicago; 2016. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10027/20939.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mores RM. Beyond the Binary Web: Using Real-Time PCR to Quantify the Structure of a Spider-Dominated Food Web. [Thesis]. University of Illinois – Chicago; 2016. Available from: http://hdl.handle.net/10027/20939

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Tasmania

24. Watson, A. The impact of 170 years of flow regulation on processes and patterns in an eastern Tasmanian river system.

Degree: 2011, University of Tasmania

URL: https://eprints.utas.edu.au/12517/4/2Watson.pdf

► The flow regime of Tooms River, a tributary of the unregulated Macquarie River in eastern Tasmania, was modified in 1840 by a shallow dam in… (more)

▼ The flow regime of Tooms River, a tributary of the unregulated Macquarie River in eastern Tasmania, was modified in 1840 by a shallow dam in its upper reaches, resulting in reversed seasonality of high and low flows: a classic, long-term example of a river subjected to “anti-drought”, but without the confounding thermal effects of impoundment stratification. I found surprisingly large differences between sites on this regulated branch and sites on the adjacent unregulated branch of the Macquarie, which persisted for 8 km downstream despite tributary inflows. This 2-year comparative study coincided with a prolonged supra-seasonal drought, which enabled examination of the effects of reduced stream flow on both regulated and unregulated examples of confined rivers in a naturally variable climatic regime. The regulated sites remained distinct from the unregulated sites, in terms of riparian litter fall, biofilm abundance and macro-invertebrate diversity. This is one of very few studies of the long-term effects of flow regulation (e.g. see Kondolf and Batalla 2005; Sheldon and Thoms 2006b), and differs from the majority of regulated river studies in that the effects of regulation of Tooms River are not confounded by land use practises or thermal stratification of the reservoir. However, this impoundment is typical of small irrigation impoundments in Mediterranean and semi-arid climate zones. The ecological consequences of drought and “antidrought” in a region with a naturally variable flow regime may inform management of biodiversity in other regulated rivers in similar climate zones. Human population increases and climate change pressure on water supplies are likely to increase the demand for many more dams of this size and type of flow alteration (Benstead et al. 1999). The determination of the long-term effects of flow regulation is essential, so that future decisions on water allocations can be based on better knowledge of the impact on downstream ecosystem services. Prolonged regulation of the flow regime of Tooms River has had major effects. Regulation has not only reversed the seasonality of flow, but has also dramatically reduced flow variability, resulting in contraction of the stream channel immediately downstream of the dam, and the establishment of mature eucalypts close to the channel, in contrast to the shrubby riparian vegetation maintained by the variable flow regime of the Macquarie River. The timing of allochthonous litter inputs to the benthos was altered, with peak litterfall delayed until irrigation demand fell at the end of summer. In addition, there was reduced lateral connectivity, with movement of leaf litter between the riparian zone and the benthos dependent on overland flow. As predicted by other studies, biofilms were more abundant in the regulated river, but the closed canopy immediately downstream of the dam did not suppress autochthonous productivity, against expectations. Chlorophyll a analyses indicated an autotrophic system, dominated by cyanobacteria and diatoms, in contrast to…

Subjects/Keywords: flow regulation; irrigation; drought; macroinvertebrates; biofilms; food web

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APA (6^th Edition):

Watson, A. (2011). The impact of 170 years of flow regulation on processes and patterns in an eastern Tasmanian river system. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/12517/4/2Watson.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Watson, A. “The impact of 170 years of flow regulation on processes and patterns in an eastern Tasmanian river system.” 2011. Thesis, University of Tasmania. Accessed April 11, 2021. https://eprints.utas.edu.au/12517/4/2Watson.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Watson, A. “The impact of 170 years of flow regulation on processes and patterns in an eastern Tasmanian river system.” 2011. Web. 11 Apr 2021.

Vancouver:

Watson A. The impact of 170 years of flow regulation on processes and patterns in an eastern Tasmanian river system. [Internet] [Thesis]. University of Tasmania; 2011. [cited 2021 Apr 11]. Available from: https://eprints.utas.edu.au/12517/4/2Watson.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Watson A. The impact of 170 years of flow regulation on processes and patterns in an eastern Tasmanian river system. [Thesis]. University of Tasmania; 2011. Available from: https://eprints.utas.edu.au/12517/4/2Watson.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

25. Kennedy, Patrick. The influence of the prey community on the growth and life history variation of aquatic apex predators in the Canadian Boreal Shield.

Degree: Biological Sciences, 2017, University of Manitoba

URL: http://hdl.handle.net/1993/32252

► Northern Pike (Esox lucius (Linnaeus, 1758)) and Lake Trout (Salvelinus namaycush (Walbaum, 1792)) are important apex predatory fish species that have ubiquitous distributions across Canada.… (more)

▼ Northern Pike (Esox lucius (Linnaeus, 1758)) and Lake Trout (Salvelinus namaycush (Walbaum, 1792)) are important apex predatory fish species that have ubiquitous distributions across Canada. While these species have been well studied due to their economic value, there remains considerable uncertainty around the influence of prey community dynamics on their growth and life history variation across the Canadian Boreal Shield. I investigated how changes and differences in prey community dynamics of Boreal Shield lakes influence the growth and life history traits expressed by these apex predators to further understand how their life history strategies have evolved, as well as how their life history strategies might shift in the face of environmental change. Broad geographic comparisons among Northern Pike populations revealed evidence for a widespread generalist foraging strategy, one that takes advantage of the availability of offshore Cisco (Coregonus artedi (Lesueur, 1818)). Similar to the offshore predator Lake Trout, Northern Pike reached larger asymptotic lengths in lakes with greater abundances of Cisco. Northern Pike additionally exhibited slower early growth rates and lower mortality rates in lakes with greater abundances of Cisco. In the absence of larger offshore prey fish, Lake Trout growth appears to be strongly influenced by the availability of nearshore prey fish in Boreal Shield lakes. Following an increase in the productivity of cyprinids in an experimental lake, the early growth rates of Lake Trout increased significantly, with the greatest amount of growth occurring after a switch to piscivory at age 2. With a variety of stressors threatening the health and stability of aquatic ecosystems, this research provides vital information pertaining to the influence of prey community dynamics on the growth potential and life history variation of aquatic apex predators in the Canadian Boreal Shield. Advisors/Committee Members: Rennie, Michael (Biological Sciences) (supervisor), Gillis, Darren (Biological Sciences).

Subjects/Keywords: Fisheries; Community Ecology; Life History; Food Web Dynamics

10 more images…

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APA (6^th Edition):

Kennedy, P. (2017). The influence of the prey community on the growth and life history variation of aquatic apex predators in the Canadian Boreal Shield. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/32252

Chicago Manual of Style (16^th Edition):

Kennedy, Patrick. “The influence of the prey community on the growth and life history variation of aquatic apex predators in the Canadian Boreal Shield.” 2017. Masters Thesis, University of Manitoba. Accessed April 11, 2021. http://hdl.handle.net/1993/32252.

MLA Handbook (7^th Edition):

Kennedy, Patrick. “The influence of the prey community on the growth and life history variation of aquatic apex predators in the Canadian Boreal Shield.” 2017. Web. 11 Apr 2021.

Vancouver:

Kennedy P. The influence of the prey community on the growth and life history variation of aquatic apex predators in the Canadian Boreal Shield. [Internet] [Masters thesis]. University of Manitoba; 2017. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1993/32252.

Council of Science Editors:

Kennedy P. The influence of the prey community on the growth and life history variation of aquatic apex predators in the Canadian Boreal Shield. [Masters Thesis]. University of Manitoba; 2017. Available from: http://hdl.handle.net/1993/32252

26. Selden, Rebecca. The consequences of fishing-induced changes in predator size for predator-prey interactions.

Degree: 2015, University of California – eScholarship, University of California

URL: http://www.escholarship.org/uc/item/85c0h954

► Body size has long been recognized as a key driver of species interactions and of an individual’s role in the ecosystem. Body size determines the… (more)

▼ Body size has long been recognized as a key driver of species interactions and of an individual’s role in the ecosystem. Body size determines the amount, species, and sizes of prey resources an individual can consume, as well as its own susceptibility to predators. Human harvest of predators can result in severe truncations in predator body size that can have cascading consequences on food webs. Where small and large individuals of the same species differ greatly in their diets, as is common in aquatic systems, the absence of large predators may functionally eliminate a key predator-prey linkage. Recently management agencies have begun to include size-based metrics as targets. As various harvest strategies differentially affect predator size and biomass, the research presented in this dissertation aims to understand the conditions under which truncations in predator size structure will result in additional loss of predator function than would be predicted from predator biomass alone, and where it will therefore be important to maintain predator size distributions. I specifically examine how the type of ontogenetic shift in diet (e.g. prey species or size class), and the shape of the diet switching function (e.g. gradual or abrupt) will affect the consequences of the loss of the largest predators, and the relative utility of various management strategies in maintaining predator function. In Chapter 1, I examined the tradeoffs between fishery yield and predator function in the ecosystem when preferentially fishing the largest predators. I found that fisheries that delay harvest until large predator sizes maximize fishery yield but that this virtually eliminates predation on focal prey eaten late in life history when diet shifts are abrupt and occur at or after the size at maturity. In this case, there is a clear tradeoff between fisheries and ecosystem objectives. Instead, where shifts in diet toward late prey are more gradual, targeting the largest predators can achieve a win-win by maximizing yield and achieving predation rates similar to that with other strategies that harvest predators earlier. As such, the optimal fishing strategy to achieve both single-species and ecosystem benefits depends strongly on the interaction between the fishery selectivity pattern and the changes in predator diet with size. In Chapter 2, I quantified the size-dependence of the predator-prey interaction between herbivorous sea urchins and one of their important predators in southern California kelp forests, California Sheephead. I further examined the consequences of changes in sheephead size and abundance in marine reserves at Catalina Island on size-specific urchin mortality in field predation trials. In my observations of predation of sheephead on urchins, sheephead smaller than 20cm TL do not eat urchins of any size. Thereafter, small sheephead only consumed small urchins, with larger sheephead sizes needed to successfully consume larger urchins, and the largest sheephead preferentially targeted the largest urchins. Inside…

Subjects/Keywords: Ecology; Conservation biology; body size; fishing; food web; predator

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APA (6^th Edition):

Selden, R. (2015). The consequences of fishing-induced changes in predator size for predator-prey interactions. (Thesis). University of California – eScholarship, University of California. Retrieved from http://www.escholarship.org/uc/item/85c0h954

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Selden, Rebecca. “The consequences of fishing-induced changes in predator size for predator-prey interactions.” 2015. Thesis, University of California – eScholarship, University of California. Accessed April 11, 2021. http://www.escholarship.org/uc/item/85c0h954.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Selden, Rebecca. “The consequences of fishing-induced changes in predator size for predator-prey interactions.” 2015. Web. 11 Apr 2021.

Vancouver:

Selden R. The consequences of fishing-induced changes in predator size for predator-prey interactions. [Internet] [Thesis]. University of California – eScholarship, University of California; 2015. [cited 2021 Apr 11]. Available from: http://www.escholarship.org/uc/item/85c0h954.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Selden R. The consequences of fishing-induced changes in predator size for predator-prey interactions. [Thesis]. University of California – eScholarship, University of California; 2015. Available from: http://www.escholarship.org/uc/item/85c0h954

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

27. McLaughlin, John Peter. The food web for the sand flats at Palmyra Atoll.

Degree: 2018, University of California – eScholarship, University of California

URL: http://www.escholarship.org/uc/item/45p5j103

► This dissertation describes and analyzes the Palmyra Atoll sand flat food web. This food web is unique in measuring the body sizes, densities, and feeding… (more)

Subjects/Keywords: Ecology; Parasitology; Body size; Food web; Intertidal; Marine; Palmyra; Parasite

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APA (6^th Edition):

McLaughlin, J. P. (2018). The food web for the sand flats at Palmyra Atoll. (Thesis). University of California – eScholarship, University of California. Retrieved from http://www.escholarship.org/uc/item/45p5j103

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

McLaughlin, John Peter. “The food web for the sand flats at Palmyra Atoll.” 2018. Thesis, University of California – eScholarship, University of California. Accessed April 11, 2021. http://www.escholarship.org/uc/item/45p5j103.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

McLaughlin, John Peter. “The food web for the sand flats at Palmyra Atoll.” 2018. Web. 11 Apr 2021.

Vancouver:

McLaughlin JP. The food web for the sand flats at Palmyra Atoll. [Internet] [Thesis]. University of California – eScholarship, University of California; 2018. [cited 2021 Apr 11]. Available from: http://www.escholarship.org/uc/item/45p5j103.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

McLaughlin JP. The food web for the sand flats at Palmyra Atoll. [Thesis]. University of California – eScholarship, University of California; 2018. Available from: http://www.escholarship.org/uc/item/45p5j103

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Plymouth

28. Lauria, Valentina. Impacts of climate change and fisheries on the Celtic Sea ecosystem.

Degree: PhD, 2012, University of Plymouth

URL: http://hdl.handle.net/10026.1/1166

► Climate change and fisheries have affected marine environments worldwide leading to impacts on ecosystem structure and functioning. However there is clear evidence of spatial variability… (more)

▼ Climate change and fisheries have affected marine environments worldwide leading to impacts on ecosystem structure and functioning. However there is clear evidence of spatial variability in the response of these impacts both within and among marine ecosystems. Although several studies have tried to explain the effect of these impacts on marine food webs, it is unclear how they interact, and how they may affect marine ecosystems remains an important unanswered question. This suggests the urgent need for multiple-trophic level and ecosystem-based management approaches to account for both fisheries and climate change impacts at ocean basins across the globe. Marine apex predators, such as seabirds, are vulnerable to the effects of both climate and fishing impacts, and can be used as reliable and sensitive bio-indicators of the status of the marine ecosystem. The Celtic Sea ecosystem is a productive shelf region in the Northeast Atlantic. It is characterized by high fish and invertebrate biodiversity. In addition, internationally important numbers of seabirds, such as Northern gannet Morus bassanus (L.), Manx shearwater Puffinus puffinus (B.), Common guillemot Uria aalge (P.) and Black-legged kittiwake Rissa tridactyla (L.), breed along the Celtic Sea coasts. In recent years, fisheries from across Europe have intensively exploited the Celtic Sea, leading to changes in stock structure. Moreover, the increase in annual average Sea Surface Temperature by 0.67 °C over the past two decades has altered the composition of plankton communities. These impacts, independently and in tandem, are likely to have had dramatic effects upon the Celtic Sea food web emphasizing the need to enhance our understanding of this important marine ecosystem. In this thesis the effects of climate change and fisheries on the Celtic Sea pelagic food web are evaluated, in particular focussing on the response of seabird populations. This is in part because of recent declines in the breeding success of many seabird colonies in the northeast Atlantic, particularly around the North Sea. Long-term data across four trophic levels (phytoplankton, zooplankton, mid-trophic level fish and seabirds) and different modelling approaches are used to determine factors influencing seabird productivity at different geographical scales. First, I review the direct and indirect effects of climate change and fisheries upon marine ecosystems, as well as their impacts upon marine birds. Second, I use data collected during 1986-2007 from a single seabird colony, across four trophic levels, to investigate long-term direct and indirect climate effects. The results suggest only a weak climate signal in the Celtic Sea, and this is only evident between mid-trophic level fish and certain species of seabird. Third, a similar multi-trophic level approach across three nearby regions in the southwest UK (Irish Sea, Celtic Sea, and English Channel) reveal no evidence of a bottom-up signal during the period 1991-2007. These findings are in contrast with the nearby North Sea region, where…

Subjects/Keywords: 333.956; seabirds, climate change, fisheries, pelagic food web

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lauria, V. (2012). Impacts of climate change and fisheries on the Celtic Sea ecosystem. (Doctoral Dissertation). University of Plymouth. Retrieved from http://hdl.handle.net/10026.1/1166

Chicago Manual of Style (16^th Edition):

Lauria, Valentina. “Impacts of climate change and fisheries on the Celtic Sea ecosystem.” 2012. Doctoral Dissertation, University of Plymouth. Accessed April 11, 2021. http://hdl.handle.net/10026.1/1166.

MLA Handbook (7^th Edition):

Lauria, Valentina. “Impacts of climate change and fisheries on the Celtic Sea ecosystem.” 2012. Web. 11 Apr 2021.

Vancouver:

Lauria V. Impacts of climate change and fisheries on the Celtic Sea ecosystem. [Internet] [Doctoral dissertation]. University of Plymouth; 2012. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10026.1/1166.

Council of Science Editors:

Lauria V. Impacts of climate change and fisheries on the Celtic Sea ecosystem. [Doctoral Dissertation]. University of Plymouth; 2012. Available from: http://hdl.handle.net/10026.1/1166

University of Washington

29. Moriarty, Pamela. Quantifying Predator-Prey Interactions: Methods, Challenges, and Applications.

Degree: PhD, 2018, University of Washington

URL: http://hdl.handle.net/1773/42357

► Knowledge of predator-prey interactions is vital in many subfields of ecology, including food web ecology, behavioral ecology, and population ecology. Information on predator-prey interactions is… (more)

Subjects/Keywords: food web; mixture model; stomach contents; Ecology; Biostatistics; Fisheries

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Moriarty, P. (2018). Quantifying Predator-Prey Interactions: Methods, Challenges, and Applications. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/42357

Chicago Manual of Style (16^th Edition):

Moriarty, Pamela. “Quantifying Predator-Prey Interactions: Methods, Challenges, and Applications.” 2018. Doctoral Dissertation, University of Washington. Accessed April 11, 2021. http://hdl.handle.net/1773/42357.

MLA Handbook (7^th Edition):

Moriarty, Pamela. “Quantifying Predator-Prey Interactions: Methods, Challenges, and Applications.” 2018. Web. 11 Apr 2021.

Vancouver:

Moriarty P. Quantifying Predator-Prey Interactions: Methods, Challenges, and Applications. [Internet] [Doctoral dissertation]. University of Washington; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1773/42357.

Council of Science Editors:

Moriarty P. Quantifying Predator-Prey Interactions: Methods, Challenges, and Applications. [Doctoral Dissertation]. University of Washington; 2018. Available from: http://hdl.handle.net/1773/42357

Arizona State University

30. Leinbach, Israel. Free Water Fuels Intraguild Predation in a Riparian Food Web.

Degree: Biology, 2015, Arizona State University

URL: http://repository.asu.edu/items/36499

► In desert riparian ecosystems, rivers provide free water but access to that water diminishes with distance producing a steep gradient in the relative importance of… (more)

▼ In desert riparian ecosystems, rivers provide free water but access to that water diminishes with distance producing a steep gradient in the relative importance of water for growth and reproduction of riparian animals and hence, their biodiversity. Previous work suggests that water limited riparian predators eat more prey to meet their water demand where free water is not available. Here I explore the effect of water limitation on prey selection and per capita interaction strengths between a predatory spider ( Hogna antelucana) and two prey species occupying different trophic levels using a controlled field experiment conducted in the riparian forest of the San Pedro River, Cochise County, AZ. Lab measurements of water and energy content revealed that intermediate predators (smaller spiders in the genus Pardosa) had 100-fold higher energy: water ratios than an alternate prey species more basal in the food web (crickets in the genus Gryllus). Given this observation, I hypothesized that water-stressed predatory wolf spiders would select more water-laden crickets but switch to more energy rich Pardosa when water stress was experimentally eliminated. Additionally, I hypothesized that switching by quenched Hogna to Pardosa would reduce predation by Pardosa on Gryllus leading to increased abundance of the basal resource. Finally, I hypothesized that water mediated switching and release of basal prey would be stronger when male Hogna was the apex predator, because female Hogna have higher energetic costs of reproduction and hence, stronger energy limitation. Experimental water additions caused both sexes of Hogna to consume significantly higher numbers of Pardosa but this difference (between water and no-water treatments) did not vary significantly between male and female Hogna treatments. Similarly, strong negative interaction strengths between Hogna and Pardosa led to release of the basal prey species and positive interaction strengths of Hogna on Gryllus. Again strong positive, indirect effects of Hogna on Gryllus did not depend on the sex of the Hogna predator. However, water mediated indirect effects of Hogna (either sex) on Gryllus were the strongest for male Gryllus. These results suggest that water and energy co-dominate foraging decisions by predators and that in managing water-energy balance; predators can modify interaction pathways, sex-ratios of prey populations and trophic dynamics.

Subjects/Keywords: Ecology; Biology; food-web; IGP; Intraguild; predation; riparian; spider

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Leinbach, I. (2015). Free Water Fuels Intraguild Predation in a Riparian Food Web. (Masters Thesis). Arizona State University. Retrieved from http://repository.asu.edu/items/36499

Chicago Manual of Style (16^th Edition):

Leinbach, Israel. “Free Water Fuels Intraguild Predation in a Riparian Food Web.” 2015. Masters Thesis, Arizona State University. Accessed April 11, 2021. http://repository.asu.edu/items/36499.

MLA Handbook (7^th Edition):

Leinbach, Israel. “Free Water Fuels Intraguild Predation in a Riparian Food Web.” 2015. Web. 11 Apr 2021.

Vancouver:

Leinbach I. Free Water Fuels Intraguild Predation in a Riparian Food Web. [Internet] [Masters thesis]. Arizona State University; 2015. [cited 2021 Apr 11]. Available from: http://repository.asu.edu/items/36499.

Council of Science Editors:

Leinbach I. Free Water Fuels Intraguild Predation in a Riparian Food Web. [Masters Thesis]. Arizona State University; 2015. Available from: http://repository.asu.edu/items/36499

Open Access Theses and Dissertations