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dc.contributor.authorSalvanes, Anne Gro Veaeng
dc.contributor.authorSkjæraasen, Jon Egileng
dc.contributor.authorNilsen, Trygveeng
dc.date.accessioned2009-10-01T07:49:44Z
dc.date.available2009-10-01T07:49:44Z
dc.date.issued2004-02-19eng
dc.PublishedMarine Ecology Progress Series 267: 241–251en
dc.identifier.issn0171-8630en_US
dc.identifier.urihttps://hdl.handle.net/1956/3507
dc.description.abstractThis study provides evidence of countergradient variations in life-history traits among coastal cod Gadus morhua off the Norwegian coast, suggesting the existence of sub-populations. One-yr-old wild-caught individuals from 70°N were smaller, grew slower, weighed less, and had a lower condition factor (CF) than southern cod from 60°N during the sampling period from June to February. In contrast, both a higher growth potential and an increase in CF were found in northern cod when offspring of northern and southern cod from the same area and of the same age as the wild cod were housed together in a ‘common-garden’ experiment. The rapid growth in northern cod was achieved by higher success in food competition when given a restricted amount of food. Active feeding behaviour and larger energy allocation to storage tissues, as suggested by the higher increase in condition, represents adaptations to the high-latitude environment for northern cod and countergradient variation. These differences suggest the existence of genetically distinct sub-populations along the Norwegian coast. Development of sub-populations that differ in behaviour and life-history strategies are discussed in relation to mechanisms for local retention of early life stages and local adaptation of older stages. Sub-populations with different life histories may respond differently to fisheries, and attention to this could be beneficial for improving fisheries management.en_US
dc.language.isoengeng
dc.publisherInter-Researchen_US
dc.subjectCoastal codeng
dc.subjectCountergradient variationeng
dc.subjectBehavioureng
dc.subjectFisheries managementeng
dc.subjectLocal adaptationeng
dc.subjectSub-populationseng
dc.titleSub-populations of coastal cod with different behaviour and life-history strategiesen_US
dc.typePeer reviewed
dc.typeJournal article
dc.identifier.doihttps://doi.org/10.3354/meps267241
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497nob


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