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 13 of 13 for “"Consumer - resource"”.
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Consumer nutrient stoichiometry : patterns, homeostasis, and links with fitness.
… such as streams, to predict the role of consumers in food web and nutrient cycles. To do To do this, the balance between consumer and diet stoichiometries is a logical starting point. Chapter three examines intra-‐specific variation in consumer-‐resource stoichiometries at a suite of …
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Asynchrony in the dynamics of chironomids across six locations in northeastern Iceland
… may include differences in habitat structure, resource dynamics, species interactions, or local consumer-resource dynamics. The results have implications for conservation management of species such as insectivorous birds that can migrate between locations and take advantage of episodic, …
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Data-adaptive reduction of process-based models
… scheme is applied to three predator-prey and consumer-resource models of different dimensionality. It is found that even relatively simple models can be reduced further and the results show that a formal conformity of physical and biological oscillating systems exists. In addition, the …
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Network structure and stability criteria for complex ecological systems
… of the evolved network. The second model is a consumer-resource model where competitive and mutualistic interactions are indirect results of the consumption and exchange of resources. We are able to prove stability of positive equilibria based on the structure of the exchange network. We show …
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INFLUENCES OF DISEASE-DRIVEN AMPHIBIAN DECLINES ON ECOSYSTEM STRUCTURE AND FUNCTION IN PANAMANIAN HEADWATER STREAMS
… potential roles of stream-dwelling tadpoles in consumer-resource dynamics, ecosystem functions such as decomposition, and ecosystem-level biogeochemical cycling. Tadpoles in tropical streams likely regulate flows and ratios of nitrogen (N), phosphorus (P), and carbon (C), influencing ecosystems …
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Small scale hydrogeomorphic features influence macroinvertebrate food webs in two Great Plains rivers
Food resources that support river food webs and food web structure have been shown to be influenced by hydrogeomorphology, and its influence on food webs has been gaining support with ecologists over the years. I analyzed the influence of local hydrogeomorphic variables on the structure and …
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Macroscopic insights from mechanistic ecological network models in a data void
… considerably on network topology and whether the consumer-resource functional response is prey- or ratio-dependent. Overall, the results vary considerably across model communities with different parameterizations, underscoring the contingency and context dependence of nature that scientists and …
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Mechanistic modeling of complex microbial communities
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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Biological control of Culex mosquitoes using multiple predators
… integrate environmental contexts that mediate consumer-resource interactions, such as climatic warming, which can drive interspecific differences between biocontrol agents. I establish that both predatory cyclopoid and calanoid copepods typically exhibit a Type II FR irrespective of abiotic …
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Carbon cycling and functional redundancy in closed microbial ecosystems
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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The occurrence and distribution of microplastics in surficial sediments and fish in a South African reservoir
Microplastics have become a major environmental concern globally due to their potential impacts on ecosystem function. They are known to be ubiquitously present, persistent and bio−accumulative, yet ecological impacts of microplastic remain poorly understood despite their ubiquity across all …
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Assessment and prediction of the potential threats of temperature change and invasive species to the sustainability of Northern Irish sea fisheries
… is imperative if the management of important resources is to be successful. Consumer – resource interactions underlie population dynamics and distribution, yet there is little known about how these interactions will respond to increasing temperature. Temperature increase can facilitate the …
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Intraspecific variation in resource use, dormancy investment, and competitive ability in the facultative parthenogen Daphnia pulicaria
… They provide ecosystem services including moving resources from the primary producers up to higher trophic levels and have served as models for grazers in other systems. Decades of research on Daphnia demonstrate substantial interspecific (between species) and intraspecific (within species) …