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dc.contributor.authorKendall, Neala W.eng
dc.contributor.authorDieckmann, Ulfeng
dc.contributor.authorHeino, Mikko Petterieng
dc.contributor.authorPunt, André E.eng
dc.contributor.authorQuinn, Thomas P.eng
dc.description.abstractSpatial and temporal trends and variation in life-history traits, including age and length at maturation, can be influenced by environmental and anthropogenic processes, including size-selective exploitation. Spawning adults in many wild Alaskan sockeye salmon populations have become shorter at a given age over the past half-century, but their age composition has not changed. These fish have been exploited by a gillnet fishery since the late 1800s that has tended to remove the larger fish. Using a rare, long-term dataset, we estimated probabilistic maturation reaction norms (PMRNs) for males and females in nine populations in two basins and correlated these changes with fishery size selection and intensity to determine whether such selection contributed to microevolutionary changes in maturation length. PMRN midpoints decreased in six of nine populations for both sexes, consistent with the harvest. These results support the hypothesis that environmental changes in the ocean (likely from competition) combined with adaptive microevolution (decreased PMRNs) have produced the observed life-history patterns. PMRNs did not decrease in all populations, and we documented differences in magnitude and consistency of size selection and exploitation rates among populations. Incorporating evolutionary considerations and tracking further changes in life-history traits can support continued sustainable exploitation and productivity in these and other exploited natural resources.en_US
dc.rightsAttribution CC BYeng
dc.subjectfishery selectioneng
dc.subjectharvest-induced evolutioneng
dc.subjectOncorhynchus nerkaeng
dc.subjectphenotypic plasticityeng
dc.subjectprobabilistic maturation reaction normseng
dc.titleEvolution of age and length at maturation of Alaskan salmon under size-selective harvesteng
dc.typeJournal articleeng
dc.subject.nsiVDP::Landbruks- og fiskerifag: 900::Fiskerifag: 920::Fiskeriteknologi: 924nob
dc.subject.nsiVDP::Landbruks- og fiskerifag: 900::Fiskerifag: 920::Ressursbiologi: 921nob
dc.subject.nsiVDP::Matematikk og naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488nob
dc.subject.nsiVDP::Agriculture and fisheries science: 900::Fisheries science: 920::Fisheries technology: 924eng
dc.subject.nsiVDP::Agriculture and fisheries science: 900::Fisheries science: 920::Resource biology: 921eng
dc.subject.nsiVDP::Mathematics and natural scienses: 400::Zoology and botany: 480::Ecology: 488eng
dc.rights.holderCopyright 2013 The Authors
bora.peerreviewedPeer reviewedeng
bora.journalTitleEvolutionary Applicationseng

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