气候变化领域集成服务门户(CCPortal): Ice-age endurance: DNA evidence of a white spruce refugium in Alaska

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DOI	10.1073/pnas.0605310103
	Ice-age endurance: DNA evidence of a white spruce refugium in Alaska
	Anderson L.L.; Hu F.S.; Nelson D.M.; Petit R.J.; Paige K.N.
发表日期	2006
ISSN	0027-8424
起始页码	12447
结束页码	12450
卷号	103 期号:33
英文摘要	Paleorecords 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. © 2006 by The National Academy of Sciences of the USA.
英文关键词	Beringia; Chloroplast; Climate change; Picea glauca; Refugia
语种	英语
scopus关键词	chloroplast DNA; article; Canada; climate change; fossil; glacier; haplotype; landscape; nonhuman; North America; nucleotide sequence; priority journal; Russian Federation; sequence analysis; species refuge; United States; white spruce; Alaska; Chloroplasts; DNA, Plant; Fossils; Genetics, Population; Haplotypes; Ice; Molecular Sequence Data; North America; Picea; Variation (Genetics); Picea glauca
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159186
作者单位	Anderson, L.L., Program in Ecology and Evolutionary Biology, University of Illinois, Urbana, IL 61801, United States; Hu, F.S., Program in Ecology and Evolutionary Biology, University of Illinois, Urbana, IL 61801, United States, Department of Plant Biology, University of Illinois, Urbana, IL 61801, United States, Department of Geology, University of Illinois, Urbana, IL 61801, United States, University of Illinois, 265 Morrill Hall, 505 South Goodwin Avenue, Urbana, IL 61801, United States; Nelson, D.M., Program in Ecology and Evolutionary Biology, University of Illinois, Urbana, IL 61801, United States; Petit, R.J., Institut National de la Recherche Agronomique, Unité Mixte de Recherche Biodiversité, Gènes et Ecosystèmes, 69 Route d'Arcachon, F-33612 Cestas Cedex, France; Paige, K.N., Program in Ecology and Evolutionary Biology, University of Illinois, Urbana, IL 61801, United States, Department of Animal Biology, University of Illinois, Urbana, IL 61801, United States
推荐引用方式 GB/T 7714	Anderson L.L.,Hu F.S.,Nelson D.M.,et al. Ice-age endurance: DNA evidence of a white spruce refugium in Alaska[J],2006,103(33).
APA	Anderson L.L.,Hu F.S.,Nelson D.M.,Petit R.J.,&Paige K.N..(2006).Ice-age endurance: DNA evidence of a white spruce refugium in Alaska.Proceedings of the National Academy of Sciences of the United States of America,103(33).
MLA	Anderson L.L.,et al."Ice-age endurance: DNA evidence of a white spruce refugium in Alaska".Proceedings of the National Academy of Sciences of the United States of America 103.33(2006).