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oai:www.ideals.illinois.edu:2142/26166 2023-07-10 col_2142_5131 col_2142_16341 com_2142_5130 com_2142_8913 com_2142_8903

Cáceres, Carla E. Bertram, Christopher R. 2011-08-25T22:17:06Z 2011-08-25T22:17:06Z 2011-08-25T22:17:06Z 2011-08 Predators directly interact with their prey. These direct interactions can indirectly alter the interactions between prey and other community members. For example, predators can alter prey life history, behavior, or morphology resulting in an indirect change in the interaction between their prey and another species (Trait-mediated indirect effects). We used two dominant predators of the zooplankter Daphnia, Bluegill sunfish (Lepomis macrochirus) and larvae of the phantom midge fly Chaoborus punctipennis, to observe how predator presence altered Daphnia traits. These trait changes were predicted to influence the interaction between Daphnia and Metschnikowia bicuspidata, a virulent and common (>40% prevalence in some lakes) fungal endo-parasitoid. In a series of susceptibility and life history assays, we determined that predators altered prey susceptibility in a genotype specific manner, they influenced parasite fitness, and affected prey life history. All of these effects have important implications in disease dynamics. This study highlights the importance of predator-induced trait-mediated indirect effects on host-parasite interactions and more generally of examining species interactions in the context of the community in which they occur. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-06-07T12:45:03Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Bertram_Christopher.pdf: 1282678 bytes, checksum: a794a89d54b1d5909824186e8cac25de (MD5) Made available in DSpace on 2011-08-25T22:17:06Z (GMT). No. of bitstreams: 2 Bertram_Christopher.pdf: 1282678 bytes, checksum: a794a89d54b1d5909824186e8cac25de (MD5) license.txt: 4069 bytes, checksum: b82f6067fef056aed663de4e0f200b97 (MD5) http://hdl.handle.net/2142/26166 en Copyright 2011 Christopher R. Bertram Community interactions host-parasite predator-prey indirect effects trait-variation Predators alter host-parasite interactions via trait-mediated indirect effects School of Integrative Biology 1383 Ecol, Evol, Conservation Biol 5107 University of Illinois at Urbana-Champaign Thesis M.S. MS: Ecol, Evol, Cons Bio -UIUC 10KS5107MS