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hal.structure.identifierUniversity of Illinois
dc.contributor.authorANDERSON, Lynn L.
hal.structure.identifierUniversity of Illinois
dc.contributor.authorHU, Feng Sheng
hal.structure.identifierUniversity of Illinois
dc.contributor.authorNELSON, David M.
hal.structure.identifierBiodiversité, Gènes et Ecosystèmes [BioGeCo]
dc.contributor.authorPETIT, Remy
hal.structure.identifierUniversity of Illinois
dc.contributor.authorPAIGE, Ken N.
dc.date.issued2006
dc.identifier.issn0027-8424
dc.description.abstractEnPaleorecords offer key information for evaluating model simulations of species migration in response to forecast climatic change. However, their utility can be greatly compromised by the existence of glacial refugia that are undetectable in fossil records (cryptic refugia). Despite several decades of investigation, it remains controversial whether Beringia, the largely unglaciated area extending from northeastern Siberia to the Yukon Territory, harbored small populations of certain boreal tree species during the last glaciation. Here, we present genetic evidence for the existence of a glacial refuge in Alaska that helps to resolve this long-standing controversy. We sequenced chloroplast DNA (cpDNA) of white spruce (Picea glauca), a dominant boreal tree species, in 24 forest stands across northwestern North America. The majority of cpDNA haplotypes are unique, and haplotype diversity is relatively high in Alaska, arguing against the possibility that this species migrated into the region from areas south of the Laurentide Ice Sheet after the end of the last glaciation. Thus, white spruce apparently survived long glacial episodes under climatic extremes in a heterogeneous landscape matrix. These results suggest that estimated rates of tree migration from fossil records may be too high and that the ability of trees to track anthropogenic warming may be more limited than previously thought
dc.language.isoen
dc.publisherNational Academy of Sciences
dc.subjectPICEA GLAUCA
dc.subjectADN CHLOROPLASTIQUE
dc.subject.enREFUGIA
dc.subject.enCHLOROPLAST
dc.subject.enCLIMATIC CHANGE
dc.subject.enBERINGIA
dc.subject.enEPICEA
dc.title.enIce-age endurance: DNA evidence of a white spruce refugium in Alaska
dc.typeArticle de revue
dc.identifier.doi10.1073/pnas.0605310103
dc.subject.halSciences du Vivant [q-bio]/Biologie cellulaire
bordeaux.journalProceedings of the National Academy of Sciences of the United States of America
bordeaux.page12447-12450
bordeaux.volume103
bordeaux.issue33
bordeaux.peerReviewedoui
hal.identifierhal-02667187
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02667187v1
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