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https://hdl.handle.net/2440/34234
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Type: | Journal article |
Title: | Dynamics of pleistocene population extinctions in beringian brown bears |
Author: | Barnes, I. Matheus, P. Shapiro, B. Jensen, D. Cooper, A. |
Citation: | Science, 2002; 295(5563):2267-2270 |
Publisher: | Amer Assoc Advancement Science |
Issue Date: | 2002 |
ISSN: | 0036-8075 1095-9203 |
Statement of Responsibility: | I. Barnes, P. Matheus, B. Shapiro, D. Jensen, A. Cooper |
Abstract: | The climatic and environmental changes associated with the last glaciation (90,000 to 10,000 years before the present; 90 to 10 ka B.P.) are an important example of the effects of global climate change on biological diversity. These effects were particularly marked in Beringia (northeastern Siberia, northwestern North America, and the exposed Bering Strait) during the late Pleistocene. To investigate the evolutionary impact of these events, we studied genetic change in the brown bear, Ursus arctos, in eastern Beringia over the past 60,000 years using DNA preserved in permafrost remains. A marked degree of genetic structure is observed in populations throughout this period despite local extinctions, reinvasions, and potential interspecies competition with the short-faced bear, Arctodus simus. The major phylogeographic changes occurred 35 to 21 ka B.P., before the glacial maximum, and little change is observed after this time. Late Pleistocene histories of mammalian taxa may be more complex than those that might be inferred from the fossil record or contemporary DNA sequences alone. |
Keywords: | Animals Ursidae DNA, Mitochondrial Diet Ecosystem Climate Ice Evolution, Molecular Phylogeny Species Specificity Base Sequence Founder Effect Haplotypes Time Factors Fossils Molecular Sequence Data Siberia |
Description: | Copyright © 2002 by the American Association for the Advancement of Science |
DOI: | 10.1126/science.1067814 |
Published version: | http://www.sciencemag.org/cgi/content/abstract/295/5563/2267 |
Appears in Collections: | Aurora harvest Earth and Environmental Sciences publications Environment Institute Leaders publications |
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