Show simple item record

dc.contributor.authorBouchard, Caroline
dc.contributor.authorGeoffroy, Maxime
dc.contributor.authorLeBlanc, Mathieu
dc.contributor.authorMajewski, Andrew
dc.contributor.authorGauthier, Stéphane
dc.contributor.authorWalkusz, Wojciech
dc.contributor.authorReist, James D.
dc.contributor.authorFortier, Louis
dc.date.accessioned2018-02-07T09:45:51Z
dc.date.available2018-02-07T09:45:51Z
dc.date.issued2017-06-27
dc.description.abstractPolar cod (Boreogadus saida) is the dominant forage fish in Arctic seas and the main prey of the ringed seal (Pusa hispida), the beluga (Delphinapterus leucas) and several seabird species. Changes in the abundance of polar cod will have cascading effects on arctic marine ecosystems. We tested the hypothesis that an earlier sea ice breakup and warmer sea surface temperatures (SST) in spring-summer result in the higher recruitment of juvenile polar cod in late summer. The density (number m 2) and biomass (mg m 2) of age-0 polar cod in August and September, estimated by hydroacoustics over 9 years in 9 areas of the Canadian Arctic, were negatively correlated to ice breakup week and positively correlated to SST. The timing of the ice breakup was the main determinant of recruitment, with mean juvenile biomass in September up to 11 times greater for early breakup (late May) than for late breakup (early September). Early ice breakup in spring increased juvenile biomass in August and September by allowing the survival of larvae hatched in winter and spring. Since 1979, ice breakup has occurred earlier by as much as 9.3 days per decade in some areas. We thus forecast a transient increase in polar cod biomass over the first part of the present century. Thereafter, the relaxation of extreme climatic conditions in Arctic seas should harbinger the replacement of the hyper-specialized polar cod by subarctic and boreal forage fish.en_US
dc.identifier.citationBouchard, C., Geoffroy, M., LeBlanc, M., Majewski, A., Gauthier, S., Walkusz, W., ... Fortier, L. Climate warming enhances polar cod recruitment, at least transiently. Progress in Oceanography. 2017;156:121-129en_US
dc.identifier.cristinIDFRIDAID 1545775
dc.identifier.doi10.1016/j.pocean.2017.06.008
dc.identifier.issn0079-6611
dc.identifier.issn1873-4472
dc.identifier.urihttps://hdl.handle.net/10037/12097
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalProgress in Oceanography
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497en_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497en_US
dc.titleClimate warming enhances polar cod recruitment, at least transientlyen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


File(s) in this item

Thumbnail

This item appears in the following collection(s)

Show simple item record