Dynamics of Pleistocene Population Extinctions in Beringian Brown Bears
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,...
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craaas:10.1126/science.1067814 2024-09-15T17:59:43+00:00 Dynamics of Pleistocene Population Extinctions in Beringian Brown Bears Barnes, I. Matheus, P. Shapiro, B. Jensen, D. Cooper, A. 2002 http://dx.doi.org/10.1126/science.1067814 https://www.science.org/doi/pdf/10.1126/science.1067814 en eng American Association for the Advancement of Science (AAAS) Science volume 295, issue 5563, page 2267-2270 ISSN 0036-8075 1095-9203 journal-article 2002 craaas https://doi.org/10.1126/science.1067814 2024-08-08T04:01:39Z 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. Article in Journal/Newspaper Bering Strait permafrost Ursus arctos Beringia Siberia AAAS Resource Center (American Association for the Advancement of Science) Science 295 5563 2267 2270 |
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Open Polar |
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AAAS Resource Center (American Association for the Advancement of Science) |
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craaas |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Barnes, I. Matheus, P. Shapiro, B. Jensen, D. Cooper, A. |
spellingShingle |
Barnes, I. Matheus, P. Shapiro, B. Jensen, D. Cooper, A. Dynamics of Pleistocene Population Extinctions in Beringian Brown Bears |
author_facet |
Barnes, I. Matheus, P. Shapiro, B. Jensen, D. Cooper, A. |
author_sort |
Barnes, I. |
title |
Dynamics of Pleistocene Population Extinctions in Beringian Brown Bears |
title_short |
Dynamics of Pleistocene Population Extinctions in Beringian Brown Bears |
title_full |
Dynamics of Pleistocene Population Extinctions in Beringian Brown Bears |
title_fullStr |
Dynamics of Pleistocene Population Extinctions in Beringian Brown Bears |
title_full_unstemmed |
Dynamics of Pleistocene Population Extinctions in Beringian Brown Bears |
title_sort |
dynamics of pleistocene population extinctions in beringian brown bears |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2002 |
url |
http://dx.doi.org/10.1126/science.1067814 https://www.science.org/doi/pdf/10.1126/science.1067814 |
genre |
Bering Strait permafrost Ursus arctos Beringia Siberia |
genre_facet |
Bering Strait permafrost Ursus arctos Beringia Siberia |
op_source |
Science volume 295, issue 5563, page 2267-2270 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.1067814 |
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Science |
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295 |
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5563 |
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2267 |
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2270 |
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1810436816206036992 |