Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Trophic transfer"”.
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Selenium uptake, trophic transfer, and toxicity in boreal lake ecosystems
… 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 …
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Coal Combustion Residuals in Receiving Lake Ecosystems: Trophic Transfer, Toxicity, and Tracers
… largemouth bass having the lowest. A lab-based trophic transfer study of field-collected biofilm and zooplankton to the model fish species, fathead minnow (Pimephalas promelas), supported the hypothesis that diet and trophic position are important mediators of fish tissue trace element …
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Trophic transfer of nearshore basal resources: interpreting fatty acid and stable isotope biomarkers
… for understanding ecosystem function and trophic connectivity in aquatic habitats. Partitioning the contribution of differing detrital resources to deep nearshore subtidal consumers is impractical using solely observational techniques such as surveys of macrophyte biomass or gut content …
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Trophic transfer of contaminants in tree swallows (Tachycineta bicolor) nesting near Lake Calumet, Illinois
Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2014-02-01T11:00:34Z
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Microbial responses to environmental forcing and implications for trophic transfer through the lens of lipidomics
… link between the base of the food web and higher trophic levels in this ecosystem. Finally, I examine the energy derived from lipids in the diets of two higher order predators along the WAP: Adelie and gentoo penguins. I aimed to determine if differences in broad population trends can be explained …
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An assessment of the biodistribution, persistence, and health impacts of microplastics and nanoplastics in fish
… found in a diverse range of organisms across trophic levels. Although organisms are continuously exposed to microplastics (1 μm - 5 mm) and nanoplastics (< 1 μm), the risk of these exposures are not understood. A risk assessment for microplastics and nanoplastics is urgently needed, but first …
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The influence of spatiotemporal variation in food web models
… stable isotopes of δ13C, δ15N, and δ34S in lower trophic level organisms throughout Lake Erie, establishing an isotopic baseline which could be used to investigate larger spatial trends in food web structure using stable isotopes. Finally, I use the foundational food web structure provided by …
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Selenium bioaccumulation and speciation in the benthic invertebrate Chironomus dilutus: an assessment of exposure pathways and bioavailability
… in aquatic ecosystems as a result of the trophic transfer of selenium from the base of the aquatic food web. This research program was designed to address specific knowledge gaps related to the bioaccumulation of selenium at the benthic-detrital link of aquatic food webs. To fulfill this …
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Zooplankton abundance, community composition and grazing in the James River Estuary (Virginia, USA)
… primary production was directly passed to higher trophic levels. Low grazing rates were attributed to poor food quality owing to the presence of non-algal particulate matter and a predominance of cyanobacteria comprising the phytoplankton community. These findings are consistent with prior studies …
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Selenium Dynamics in Headwater Streams of the Central Appalachian Coalfields: An Investigation of Enrichment and Bioaccumulation
… media (sediment, biofilm and leaf detritus) and trophic transfer of Se to prey from particulate media and to predators from prey, did not exhibit major differences among streams of differing Se levels. Water column Se concentrations were predicative of Se concentrations in macroinvertebrate …
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The dynamics of surface detachment and quorum sensing in spatially controlled biofilm colonies of Pseudomonas aeruginosa
… and microbial behavior (chemotaxis) affect trophic in a microbial food web. Results show that the intensity of the trophic transfer strong depends on the motile behavior of the different trophic levels: trophic transfer is enhanced when directional motility towards resource patches outweighs …
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Attraction and risk in urban bird habitats
… fruit availability in urban habitats and (3) the trophic transfer of heavy metal contaminants across the avian food chain in an urban brownfield. Results show that, while urban habitats may have similar communities to suburban habitats, variation in community composition within habitats is greater …
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Environmental biotransformation of chiral polychlorinated biphenyls and their metabolites
… Sound (Canada) and Svalbard (Norway). High trophic level organisms, including harp seal, beluga, and narwhal reported for the first time, had species-specific atropisomer signatures, likely due to a combination of in vivo biotransformation and trophic transfer. PCB chiral signatures in …
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Modeling the Biogeochemical Cycle of Selenium in the San Francisco Bay
… to predict selenium concentrations in higher trophic levels. Furthermore the model can be used as a template to study the biogeochemical cycle of other elements in well-mixed estuaries, and in restoration projects, pollution control and other trophic transfer scenarios.</p>
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The Effects of Food Quality and Temperature on Mesozooplankton Physiology
… and their effects on biogeochemical cycles and trophic transfer of energy.
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Are aquatic food webs vulnerable to copper and gold engineered nanoparticles?
… 1) NPs decrease insect emergence and exhibit trophic transfer from aquatic insects to riparian spiders and 2) double consumer mediated nutrient recycling rates resulting in a higher availability of nutrients available for plant uptake and 3) increase the algal biomass and alter microbial …
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FACTORS CONTROLLING NICKEL BIOAVAILABILITY AND EFFECTS ON BENTHIC INVERTEBRATES IN HARDWATER FRESHWATER STREAMS
… similarly with regard to food uptake and trophic transfer of <sup>62</sup>Ni, which suggested little <sup>62</sup>Ni transfer from food sources.</p> <p>There are fewer studies and data available for the ecotoxicity of Ni, and these studies help discern Ni bioavailability on a range of …
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ECOLOGICAL AND SOCIOLOGICAL IMPLICATIONS OF TISZA RIVER MINE TAILINGS POLLUTION AND EFFECT OF CHRONIC CADMIUM EXPOSURE ON FISH PHYSIOLOGY
… Is there evidence for bioaccumulation and/or trophic transfer of metals to fish in the Tisza?; (3.) What are angler’s perceptions and fish consumption risks in the lower Tisza river basin?; and (4.) What are the effects of sub-lethal exposure to cadmium on growth, development, metabolism, and …
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Trophic dynamics in Australian seagrass beds : unravelling linkages from nutrients to fish
The study of food webs and trophic dynamics has been a major endeavour for biologists for over half a century. The major aim of trophic ecology has been to explain the complex structures and interaction of food webs using simple models and generalities. A key debate in this research field has been …
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Dynamik und Energietransfer einer planktischen Crustaceengemeinschaft in Abhängigkeit von der Nahrungsgrundlage und den Planktivoren
… unter mesotrophen Bedingungen die trophische Transfereffizienz vom Phytoplankton zum Crustaceenplankton maximal ist, in einem Ganz-Seen-Experiment zu überprüfen. Die Untersuchungen erfolgten im Rahmen des Projektes "Top-Down-Steuerung planktischer Biozönosen" am mesotrophen Großen …
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