Partitioning the relative fitness effects of diet and trophic morphology in the threespine stickleback

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dc.contributor.authorBolnick, Daniel I.
dc.contributor.authorAraujo, Marcio S. [UNESP]
dc.contributor.institutionUniv Texas Austin
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2013-09-30T18:48:15Z
dc.date.accessioned2014-05-20T13:57:35Z
dc.date.available2013-09-30T18:48:15Z
dc.date.available2014-05-20T13:57:35Z
dc.date.issued2011-07-01
dc.description.abstractBackground: Numerous models show that if morphology and diet are correlated, frequency-dependent competition will lead to fitness differences among phenotypically dissimilar individuals within a species.Hypothesis: Selection acts primarily on diet, and only indirectly on morphology via its correlation with diet.Field sites and organism: British Columbia, Canada; 340 individual threespine stickleback (Gasterosteus aculeatus) from McNair Lake and 430 individuals from First Lake.Measurements: Stable isotopes (delta C-13 and delta N-15; a proxy for diet); trophic morphology (quantitative traits and geometric shape variables); and growth rates (RNA/DNA ratios; a proxy for the component of fitness arising from competitive or foraging ability).Analysis: Linear and quadratic regression of growth rate on stable isotopes and morphological variables to calculate the relationship between growth (a fitness proxy) and diet and/or morphology. When both morphology and isotopes affected growth rates, we used a path analysis to separate their effects.Conclusions: In the McNair Lake population, growth was dependent primarily on diet type and only indirectly on trophic morphology. In a second population, path analysis found that isotopes and body shape separately explain variation in growth rates. We infer that, in stickleback, selection on trophic morphology is often a correlated side-effect of selection on diet composition, rather than direct fitness effects of morphology per se.en
dc.description.affiliationUniv Texas Austin, Sect Integrat Biol, Howard Hughes Med Inst, Austin, TX 78712 USA
dc.description.affiliationUniv Estadual Paulista, Inst Biociencias, Dept Ecol, Rio Claro, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Biociencias, Dept Ecol, Rio Claro, SP, Brazil
dc.description.sponsorshipDavid and Lucille Packard Foundation
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipNSF
dc.format.extent439-459
dc.identifierhttp://www.evolutionary-ecology.com/abstracts/v13/2657.html
dc.identifier.citationEvolutionary Ecology Research. Tucson: Evolutionary Ecology Ltd, v. 13, n. 5, p. 439-459, 2011.
dc.identifier.issn1522-0613
dc.identifier.urihttp://hdl.handle.net/11449/20521
dc.identifier.wosWOS:000301681500001
dc.language.isoeng
dc.publisherEvolutionary Ecology Ltd
dc.relation.ispartofEvolutionary Ecology Research
dc.relation.ispartofjcr0.612
dc.relation.ispartofsjr0,511
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectdirectional selectionen
dc.subjectfrequency-dependent selectionen
dc.subjectfitness landscapeen
dc.subjectfunction-valued traiten
dc.subjectGasterosteus aculeatusen
dc.subjectstabilizing selectionen
dc.subjectstable isotopesen
dc.subjecttrophic morphologyen
dc.titlePartitioning the relative fitness effects of diet and trophic morphology in the threespine sticklebacken
dc.typeArtigo
dcterms.rightsHolderEvolutionary Ecology Ltd
unesp.author.orcid0000-0003-3148-6296[1]
unesp.author.orcid0000-0003-3533-744X[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Rio Claropt

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Artigos - Ecologia - IBRC