Revenge of the host: cannibalism, ontogenetic niche shifts, and the evolution of life-history strategies in host-parasitoid systems

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dc.citation.firstpage31en_US
dc.citation.journalTitleEvolutionary Ecology Researchen_US
dc.citation.lastpage49en_US
dc.citation.volumeNumber14en_US
dc.contributor.authorRudolf, Volker H.W.en_US
dc.contributor.authorSorrell, Ianen_US
dc.contributor.authorPederson, Amy B.en_US
dc.date.accessioned2013-01-30T16:31:25Zen_US
dc.date.available2014-01-31T06:10:03Zen_US
dc.date.issued2012en_US
dc.description.abstractQuestion: How does cannibalism in the host alter the evolution of a parasitoid’s oviposition strategy? Can differences in cannibalism risk between parasitized and healthy hosts alter the stage-specific foraging of parasitoids? Can host-specific differences in cannibalistic behaviour explain why parasitoids vary in what host stages they attack? Mathematical methods: We examined the evolutionary dynamics of a stage-structured host–parasitoid model using two complementary approaches: (1) individual-based numerical simulations of evolutionary dynamics, and (2) the theory of adaptive dynamics focusing on evolutionarily stable strategies (ESSs). Assumptions: Cannibalism in the host is assumed to be stage structured, with larger stages consuming smaller stages. The consumption of parasitized hosts also results in killing of the parasitoid’s offspring. Vulnerability to cannibalism of parasitized versus healthy hosts was allowed to vary. The parasitoid’s preference for attacking early versus late host stages was the trait under selection and allowed to evolve. Results: When cannibalism rates increase relative to the parasitoid’s attack rates, the ESS of the parasitoid shifts from attacking only early host stages to attacking only late host stages. This shift occurs at lower cannibalism rates when parasitized hosts are more susceptible to cannibalism than healthy hosts. Under equilibrium conditions, a small boundary area exists between these two regions where attacking only early or only late host stages are alternative ESSs. The threshold and alternative stable ESSs are the result of cannibalism, which creates a positive feedback between the parasitoid’s oviposition rate and its own mortality. Intermediate strategies, where parasitoids evolve to attack both stages, occur only when host populations exhibit large population oscillations or when generalist parasitoids that attack both stages have a foraging advantageen_US
dc.embargo.terms1 yearen_US
dc.identifier.citationRudolf, Volker H.W., Sorrell, Ian and Pederson, Amy B.. "Revenge of the host: cannibalism, ontogenetic niche shifts, and the evolution of life-history strategies in host-parasitoid systems." <i>Evolutionary Ecology Research,</i> 14, (2012) Evolutionary Ecology, Ltd.: 31-49. <a href="https://hdl.handle.net/1911/69883">https://hdl.handle.net/1911/69883</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/69883en_US
dc.language.isoengen_US
dc.publisherEvolutionary Ecology, Ltd.en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.subject.keywordcannibalismen_US
dc.subject.keywordlife-history evolutionen_US
dc.subject.keywordmutual predationen_US
dc.subject.keywordontogenetic niche shiften_US
dc.subject.keywordrole reversalen_US
dc.subject.keywordsize structureen_US
dc.titleRevenge of the host: cannibalism, ontogenetic niche shifts, and the evolution of life-history strategies in host-parasitoid systemsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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