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 81 for “"trophic interactions"”.
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Productivity and Trophic Interactions in the Missouri River Impoundments
… Oahe are poorly understood. In addition to the trophic interactions of walleye and gizzard shad, similarities/differences between foraging patterns of walleye and sauger Sander canadenses, two similar species found throughout the Missouri River impoundments, were examined. Sauger is of …
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Predation Vulnerability and Trophic Interactions of Pallid Sturgeon Scaphirhynchus albus
… fish, such as the pallid sturgeon, understanding trophic interactions will assist in implementing a successful recovery plan. Predation can play an important role in the recruitment dynamics of fishes with intensity regulated by behavioral (i.e., prey selectivity) and/or environmental conditions. …
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Agroecosystem management strategies and trophic interactions among herbivores, pathogens and predators
… in agroecosystems soil. Studiyng the ecological interactions between predators, pathogens and herbivores is a key factor in understanding the role of biological control of pests in agroecosystems. As a model of crop management practices and conservative biological control strategies we used chili …
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Fecal Bacterial Communities as an Indicator of Trophic Interactions Among Anuran Larvae
<p>Anurans are mass spawners, often with multiple females spawning together, resulting in thousands of tadpoles sharing a habitat. Such large numbers of tadpoles with limited dispersal can lead to intense competition for resources. Inter and intra-specific competition for food could have negative …
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Dryland state transitions, trophic interactions, and the restoration of a keystone species
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Trophic interactions between larval gizzard shad and resident zooplanktivores in Claytor Lake, Virginia
… clupeid prey resource. This study examined the trophic interactions between larval shad and resident zooplanktivorous fishes, in an attempt to discover the potential for trophic competition and negative impacts to these fish species. Ichthyoplankton sampling in 1997 and 1998 showed that peak …
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You eat what you need : food quality and trophic interactions in planktonic food webs
Da Zooplankter oft Schwankungen in der Nahrungsqualität und -quantität ausgesetzt sind, müssen sie Möglichkeiten entwickelt haben, mit diesen Schwankungen umzugehen. Ich habe gezeigt, dass die unterschiedlichen Entwicklungsstadien von Copepoden selektiv die Beute fressen, die grosse Mengen des von …
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Investigating trophic interactions between parasites and their marine fish hosts using stable isotope analysis
… have a relatively limited understanding of their trophic ecology. Hence, in order to incorporate parasites into food-web models and ecological studies, basic trophic interactions between parasites and their hosts need to be assessed. Here, I investigated host-parasite interactions using stable …
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Habitat Ecology, Trophic Interactions, and Distribution of Endangered Himalayan Musk Deer in the Nepal Himalaya
… to explore and assess the habitat selection, trophic interactions and distribution of Himalayan musk deer. Chapter one deals with seasonal diet analysis of musk deer along with the overlap in consumption with livestock during summer. Microhistological technique was employed to assess dietary …
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Trophic Interactions And The Efficacy Of Milfoil Weevils For Biocontrol Of Eurasian Watermilfoil In Wisconsin Lakes
<p>Eurasian water-milfoil (Myriophyllum spicatum L., henceforth “EWM”) is the most heavily managed nuisance submersed aquatic plant in the United States. EWM’s rapid spring growth and formation of dense surface mats inhibits native macrophyte communities, serves as poor-quality habitat for fish and …
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Prairie dogs, plants, and pollinators: tri-trophic interactions affect plant-insect floral visitor webs in shortgrass steppe
… describing the relative frequency of different interactions on- and off-colonies in 2004 and 2005. Over the entire study, I sampled the plant and insect communities of seven paired colony and off-colony sites on the Shortgrass Steppe Long-term Ecological Research site. On colonies, there was …
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The ecology of colonial radiolarians : their colony morphology, trophic interactions and associations, behavior, distribution, and the photosynthesis of their symbionts
Colonial radiolarians (Spumellaria) are among the most common and abundant large zooplankton, but they have been little studied by modern biologists. Colonies were found on 98% of epipelagic diving stations in the period from 1977 to 1979. Measured abundances ranged from .04 to 540 colonies per m3. …
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Tropic interactions within South African intertidal mussel beds
… previously shown to be strongly influenced by trophic interactions, particularly interactions between predators of mussels and their prey. This investigation involved, firstly, construction of models to simulate trophic interactions in the mussel beds of the west coast of South Africa under …
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Evaluation of native bee nesting rates and beetle community assemblages in the presence of clothianidin in the soil of natural areas
… however, beetle feeding guild abundances and trophic interactions between feeding guilds were influenced by clothianidin contamination. These results suggest that neonicotinoid contamination of natural habitats can have a number of environmental consequences for arthropods and that these …
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The Trophic Ecology of Psammechinus miliaris in Scottish Sea Lochs
Understanding the trophic relationships between organisms is crucial to understanding ecosystem functioning and as such regular echinoids have been termed keystone through the action of their grazing. Much research has focused on this group’s action as herbivores, but as a group omnivory is common. …
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Valuing the ecosystem services provided by UK bats under climate change
… climate change may affect bat communities, their trophic interactions, and the ecosystem services they provide. By integrating species distribution modelling, functional trait analysis, molecular dietary data, trophic network reconstruction, and economic valuation, this thesis develops a …
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INDIVIDUAL AND ENVIRONMENTAL EFFECTS ON LIFE HISTORY TRAIT EXPRESSION IN NAZCA BOOBIES
… within the boobies’ foraging envelope. Instead, trophic interactions with subsurface predators may influence Nazca booby responses to oceanographic variables. As a whole, this dissertation shows the ability of long-term, individual-based, ecological studies to address important topics from …
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Spatiotemporal Variability in the Macroinvertebrate Community of a Small Coastal California Stream, Little Creek, Davenport, California
… to a riparian canopy manipulation. However, trophic interactions that influence secondary production in the study reaches could be inferred based on temporal patterns in feeding guild composition; the relative abundance of shredder taxa coincided with seasonal detrital inputs indicating that …
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Assessing the influence of geological and land-use gradients on zooplankton and phytoplankton biodiversity in the land between ecotone
… to be influenced by species-specific and trophic interactions. Overall, my research has provided insight into the important drivers of lake water quality and plankton communities in TLB.
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Modelling South African cold-water coral habitats
… three scenarios designed to investigate whether trophic links in the cold-water coral ecosystems could account for increased fish abundance: scenario 1, the removal of both cold-water coral and cold-water coral skeleton; scenario 2, changes in fishing pressure on small pelagic fish; scenario 3, …
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