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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 189 for “"Food webs"”.

  1. Host-Parasite Interactions Within Food Webs

    Hasik, Adam Zvanut2022

    … complex web of species interactions that compose food webs. Furthermore, host-parasite interactions are mediated by many of the same ecological factors as other species interactions, which has implications for parasitism dynamics within ecological communities. Future studies of food webs must …

    arkansas Repository record

  2. Ecology and evolution in microbial food webs

    Schaal, Kaitlin A.; id_orcid0000-0001-9033-9646ETH Zurich2022

    ethz Repository record

  3. Ants and spiders in grassland food webs

    Sanders, Dirk2012

    Eine Herauforderung ökologischer Forschung ist das Verständnis des Zusammenhangs von Nahrungsnetzinteraktionen und Ökosystemfunktionen. Aktuelle Studien weisen dem Fraßdruck durch invertebrate Räuber und den damit ausgelösten trophischen Kaskaden eine wichtige Rolle in terrestrischen Ökosystemen …

    goettingen Repository record

  4. Food webs: Realizing biological inspiration for sustainable industrial resource networks

    Layton, Astrid C.Georgia Institute of Technology2014

    … developed that uses analogies with biological food webs to guide industry design. Studying ecological food webs shows that among the metrics in use, critical quantities of interest for industry design include the internal cycling of energy, the ratio of producers to consumers, and the ratio of …

    gatech Repository record

  5. Influence of Resource Pulses Following Stochastic Disturbances on Aquatic Food Webs

    Weber, Michael John

    … from stochastic disturbances affect eutrophic food webs is unknown. The objectives of this study were: 1) to estimate the range of common carp carrion biomass and nutrients released following winterkill and their resulting effects on nutrient availability and primary and secondary productivity; …

    sdstate Repository record

  6. Distances Between Species in Food Webs: Evaluating Alternative Metrics' Predictive Power

    Johnson, Molly C2021

    … and indirect interactions between species in a food web without additional information concerning the strengths of species interactions. Communicability is then compared to shortest path distance, a metric only containing information about the shortest path between two species. We found that …

    kennesaw Repository record

  7. Are aquatic food webs vulnerable to copper and gold engineered nanoparticles?

    Perrotta, Brittany G., 1991-Baylor University.2020

    … poorly understood within the context of aquatic food webs. To address this interaction, I examined the impacts of a citrate-coated gold nanoparticle (AuNPs) and a commercial pesticide containing Cu(OH)2 nanoparticles (CuNPs) on aquatic food webs under both ambient and enriched nutrient …

    baylor Repository record

  8. Fire disturbance belowground: untangling consequences for soil food webs and organic matter

    Pressler, Yamina, author, Moore, John C., advisor, Cotrufo, M. Francesca, advisor, Knapp, Alan K., committee member, Balgopal, Meena M., committee memberColorado State University. Libraries2019

    … ecosystem services including the provisioning of food and fiber, decomposition and nutrient cycling, water filtration, and the maintenance of terrestrial biodiversity. These complex belowground communities, and therefore the ecosystem processes they regulate, are increasingly threatened by fire …

    colostate Repository record

  9. Food webs in the lower Waikato River and the role of hydrogeomorphic complexity

    Pingram, Michael AlisterUniversity of Waikato2014

    … is still a major knowledge gap understanding food webs supporting fisheries of large river ecosystems. Quantifying the contributions of carbon sources that support food webs is an important and growing field of ecological research, with implications for future management and rehabilitation of …

    waikato-masters Repository record

  10. Small scale hydrogeomorphic features influence macroinvertebrate food webs in two Great Plains rivers

    Lutchen, JackobUniversity of Kansas2020

    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 …

    ku Repository record

  11. Linking Prey to Predator: Scale Dependence and Oceanographic Influence in Marine Food Webs

    Hazen, Elliott2008

    … a critical tool that can be used to investigate food web linkages at many spatial scales. At a broad scale, migratory top predators are often modeled relative to oceanographic structure as a proxy for the distribution of their prey. At a fine scale, combining novel technologies including …

    duke Repository record

  12. Exploring Fish Diversity as a Determinant of Ecosystem Properties in Aquatic Food Webs

    Carey, Michael P.University of Illinois at Urbana-Champaign2015

    I examined the effect of common carp across a gradient of fish richness in mesocosms. The invader reduced native fish production and the effect was reduced with increasing fish richness. The invertebrate community was modified by a top-down effect from the richness treatment, whereas the invader …

    uiuc Repository record

  13. You eat what you need : food quality and trophic interactions in planktonic food webs

    Meunier, CédricUniversität Oldenburg

    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 …

    oldenburg Repository record

  14. Freshwater inflows to estuaries : organic carbon and microbial food webs in south-east Australia

    Hitchcock, JN2015

    … in the coastal carbon cycle and microbial food webs in south-east Australian estuaries. The results provide a strong case to protect freshwater inflows to estuaries.

    uts Repository record

  15. The relative role of protozoans in the flux of phytoplankton nitrogen through pelagic food webs

    Matthews, Susan GailDepartment of Biological Sciences1991

    Experiments were carried out during a cruise in the southern Benguela upwelling region in April 1989 to budget the nitrogen flux through the different microplanktonic compartments leading to copepods. Uptake of nitrate and ammonium by three different size classes of phytoplankton (net-, nano-, and …

    cape-town Repository record

  16. Benthic microalgae on the Louisiana inner continental shelf: biomass, distribution, and contribution to benthic food-webs

    Grippo, Mark AlanBiological Sciences2022

    Phytoplankton and benthic microalgae (BMA) may both contribute to the sediment organic matter pool available to benthic consumers. Recent studies have highlighted the presence and ecological roles of benthic microalgae (BMA) on the continental shelf but studies from the north-central Gulf of Mexico …

    lsu-thes Repository record

  17. Food webs and phenology models: evaluating the efficacy of ecologically based insect pest management in different agroecosystems

    Philips, Christopher RobinVirginia Tech2013

    Integrated pest management (IPM) is defined as an effective and environmentally sensitive approach to pest management that relies on a combination of common-sense practices. Integrated pest management programs use current, comprehensive information on the life cycles of pests and their interactions …

    vt Repository record

  18. Predation effects of benthivorous fish on stream food webs – a large scale and long term field experiment

    Winkelmann, CarolaTechnische Universität Dresden

    … controls structure and functioning of aquatic food webs. In the past, however, a large part of effort was concentrated on lakes and reservoirs. Thus, the knowledge about stream ecosystems is much more rudimentary than that for lakes in this respect. The aim of this thesis, therefore, was to …

    qucosa-diss

  19. ECOTOXICOLOGICAL IMPACTS OF RUN-OF-RIVER DAMS ON THE AMERICAN DIPPER (CINCLUS MEXICANUS) AND MOUNTAIN STREAM FOOD WEBS

    Norbury, Veronica Maxine 1990-University of Saskatchewan2016

    … potential impacts of RoR hydropower on river food webs. From August 2014 to November 2015, I conducted seasonal river bird surveys at 14 streams in coastal British Columbia, Canada and sampled food webs at 13 of these streams (7 regulated and 6 unregulated). Regulated streams create stable …

    sask Repository record

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

    Staats, Molly Frances

    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 mercury to become methylated. To compare the importance of these two factors in a riverine system I examine sites with varying sediment total mercury …

    montana-tech Repository record

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