Global ETD Search
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Showing 1 to 12 of 12 for “"omnivory"”.
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Permanent Coexistence for Omnivory Models
… particularly puzzling for a natural system with omnivory due to the fact that simple mathematical models of omnivory are prone to species extinction. Omnivory is defined as the consumption of resources from more than one trophic level. In this work, we investigate three omnivory models of …
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A case of omnivory: an iolinid predatory mite can feed on a fungus, the plant and a pest on tomatoes
… the iolinids inducing plant defences. Keywords: Omnivory; Biological control; Disease management.
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Body Size And Habitat Shading Influence The Consumptive And Non-Consumptive Effects Of Wood Frog (lithobates Sylvaticus) Tadpoles On Aquatic Invertebrate Communities
… The objectives of this study were to quantify omnivory among wood frog (Lithobates sylvaticus) tadpoles, determine their consumptive and non-consumptive effects on invertebrate communities, and investigate whether such effects are mediated by habitat shading and tadpole body size. Lithobates …
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The Trophic Ecology of Psammechinus miliaris in Scottish Sea Lochs
… group’s action as herbivores, but as a group omnivory is common. The aim of this study was to investigate the trophic ecology of the locally super abundant regular echinoid species Psammechinus miliaris within<br/>Scottish sea lochs. To do this the study used manipulative field experiments …
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Differentiating the effects of two non-native fish in the Turnbull National Wildlife Refuge
… fishless, which may indicate a greater amount of omnivory among invertebrate predators within BS ponds. Mean zooplankton length decreased by 104% in the presence of BS ponds and 79% in coinvaded ponds. The addition of pumpkinseed was found to be the primary factor effecting zooplankton abundance …
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Ecology of Root-Feeding Insect Assemblages in Fire-Manipulated Longleaf Pine-Wiregrass Ecosystems
… crop samples; 15N abundance was used to detect omnivory. Overall, insects appeared to be non-selective herbivores and omnivores that may alter foraging behavior to maintain a mixed diet (i.e. reducing or increasing warm season grass consumption when its abundance was high or low, respectively). …
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A Spatial and Multivariate Approach to Examining Effects of Urbanization on Nitrogen Sources, Organic Matter Inputs, and Trophic Structure in Streams of Cobb and Paulding Counties, Georgia.
… consistent with a shift in the food web towards omnivory. Use of impervious surface area, land cover land use and ẟ<sup>15</sup>N to monitor water quality could provide an early indicator for stream degradation.</p>
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Niche Occupancy, Partitioning, and the Role of Trophic Flexibility in Coexistence of Neotropical Bats
… an exceptional amount of trophic flexibility and omnivory across faunas, particularly phytophagous species. The goal of my dissertation is to understand how ecological forces shape niche occupancy among diverse communities of bats, and to better understand how trophic flexibility enables niche …
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Stable Carbon and Nitrogen Isotopes of Shell Bound organic Matter, Implications for Modern and Ancient Food Web Dynamics
… on spatial and temporal scales and 2) trophic omnivory, where an organism feeds at multiple trophic levels. As a result, the δ15N signature of an organism's tissue can incorporate these temporal changes in its isotopic composition and complicates the process of extracting trophic information …
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Bacterioplankton dynamics in the Southern Benguela upwelling region
… conditions herbivorous copepods may switch to omnivory, ingesting microzooplankton of the microbial food web, and stimulating enhanced remineralisation to further sustain primary production. A generic size-based simulation model of the dynamics of the plankton community indicated that bacteria …
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Feeding Ecology of Invasive Catfishes in Chesapeake Bay Subestuaries
Blue Catfish Ictalurus furcatus are native to tributaries of the Mississippi River but are now invasive in several Atlantic slope drainages. This includes subestuaries of the Chesapeake Bay, where their feeding ecology and potential impact on native species was largely unknown. We collected stomach …