Annual variation in predation risk is related to the direction of selection for brain size in the wild

Show simple item record Jaatinen, Kim Moller, Anders P. Ost, Markus 2020-11-13T09:09:01Z 2020-11-13T09:09:01Z 2019-08-14
dc.identifier.citation Jaatinen , K , Moller , A P & Ost , M 2019 , ' Annual variation in predation risk is related to the direction of selection for brain size in the wild ' , Scientific Reports , vol. 9 , 11847 .
dc.identifier.other PURE: 129915862
dc.identifier.other PURE UUID: 4495f0bb-85b9-4df3-b495-380fa0f63be3
dc.identifier.other WOS: 000480678100046
dc.description.abstract The direction of predator-mediated selection on brain size is debated. However, the speed and the accuracy of performing a task cannot be simultaneously maximized. Large-brained individuals may be predisposed to accurate but slow decision-making, beneficial under high predation risk, but costly under low risk. This creates the possibility of temporally fluctuating selection on brain size depending on overall predation risk. We test this idea in nesting wild eider females (Somateria mollissima), in which head volume is tightly linked to brain mass (r(2) = 0.73). We determined how female relative head volume relates to survival, and characterized the seasonal timing of predation. Previous work suggests that relatively large-brained and small-brained females make slow versus fast nest-site decisions, respectively, and that predation events occur seasonally earlier when predation is severe. Large-brained, late-breeding females may therefore have higher survival during high-predation years, but lower survival during safe years, assuming that predation disproportionately affects late breeders in such years. Relatively large-headed females outsurvived smaller-headed females during dangerous years, whereas the opposite was true in safer years. Predation events occurred relatively later during safe years. Fluctuations in the direction of survival selection on relative brain size may therefore arise due to brain-size dependent breeding phenology. en
dc.format.extent 7
dc.language.iso eng
dc.relation.ispartof Scientific Reports
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject EVOLUTION
dc.subject HYPOTHESIS
dc.subject STRATEGIES
dc.subject COGNITION
dc.subject ECOLOGY
dc.subject MODELS
dc.subject FEMALE
dc.subject 1181 Ecology, evolutionary biology
dc.title Annual variation in predation risk is related to the direction of selection for brain size in the wild en
dc.type Article
dc.contributor.organization Tvärminne Zoological Station
dc.description.reviewstatus Peer reviewed
dc.relation.issn 2045-2322
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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