Hide metadata

dc.date.accessioned2018-10-11T13:38:46Z
dc.date.available2018-10-11T13:38:46Z
dc.date.created2018-01-02T08:31:23Z
dc.date.issued2017
dc.identifier.citationLaidre, K.L. Stern, H. Born, E.W. Atkinson, S.N. Wiig, Øystein Andersen, L.W. Lunn, N.J. Regehr, E.V. McGovern, R. Dyck, M. Heagerty, P. . Range contraction and increasing isolation of a polar bear subpopulation in an era of sea ice loss.. Ecology and Evolution. 2017
dc.identifier.urihttp://hdl.handle.net/10852/65138
dc.description.abstractClimate change is expected to result in range shifts and habitat fragmentation for many species. In the Arctic, loss of sea ice will reduce barriers to dispersal or eliminate movement corridors, resulting in increased connectivity or geographic isolation with sweeping implications for conservation. We used satellite telemetry, data from individually marked animals (research and harvest), and microsatellite genetic data to examine changes in geographic range, emigration, and interpopulation connectivity of the Baffin Bay (BB) polar bear (Ursus maritimus) subpopulation over a 25‐year period of sea‐ice loss. Satellite telemetry collected from n = 43 (1991–1995) and 38 (2009–2015) adult females revealed a significant contraction in subpopulation range size (95% bivariate normal kernel range) in most months and seasons, with the most marked reduction being a 70% decline in summer from 716,000 km2 (SE 58,000) to 211,000 km2 (SE 23,000) (p < .001). Between the 1990s and 2000s, there was a significant shift northward during the on‐ice seasons (2.6° shift in winter median latitude, 1.1° shift in spring median latitude) and a significant range contraction in the ice‐free summers. Bears in the 2000s were less likely to leave BB, with significant reductions in the numbers of bears moving into Davis Strait (DS) in winter and Lancaster Sound (LS) in summer. Harvest recoveries suggested both short and long‐term fidelity to BB remained high over both periods (83–99% of marked bears remained in BB). Genetic analyses using eight polymorphic microsatellites confirmed a previously documented differentiation between BB, DS, and LS; yet weakly differentiated BB from Kane Basin (KB) for the first time. Our results provide the first multiple lines of evidence for an increasingly geographically and functionally isolated subpopulation of polar bears in the context of long‐term sea‐ice loss. This may be indicative of future patterns for other polar bear subpopulations under climate change.en_US
dc.languageEN
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleRange contraction and increasing isolation of a polar bear subpopulation in an era of sea ice loss.en_US
dc.typeJournal articleen_US
dc.creator.authorLaidre, K.L.
dc.creator.authorStern, H.
dc.creator.authorBorn, E.W.
dc.creator.authorAtkinson, S.N.
dc.creator.authorWiig, Øystein
dc.creator.authorAndersen, L.W.
dc.creator.authorLunn, N.J.
dc.creator.authorRegehr, E.V.
dc.creator.authorMcGovern, R.
dc.creator.authorDyck, M.
dc.creator.authorHeagerty, P.
cristin.unitcode185,28,8,0
cristin.unitnameSeksjon for forskning og samlinger
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1
dc.identifier.cristin1533389
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Ecology and Evolution&rft.volume=&rft.spage=&rft.date=2017
dc.identifier.jtitleEcology and Evolution
dc.identifier.doi10.1002/ece3.3809
dc.identifier.urnURN:NBN:no-67666
dc.type.documentTidsskriftartikkelen_US
dc.type.peerreviewedPeer reviewed
dc.source.issn2045-7758
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/65138/1/2018%2BLaidre_et_al-Ecology_and_Evolution%2BRange%2BContraction.pdf
dc.type.versionPublishedVersion


Files in this item

Appears in the following Collection

Hide metadata

Attribution 4.0 International
This item's license is: Attribution 4.0 International