Life and extinction of megafauna in the ice-age Arctic
Life and extinction of megafauna in the ice-age Arctic
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冰河时代北极巨型动物的生命和灭绝
DOI:
10.1073/pnas.1516573112
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Shapiro, Beth
中科院分区:
文献类型:
--
作者:
Mann, Daniel H.;Groves, Pamela;Reanier, Richard E.;Gaglioti, Benjamin V.;Kunz, Michael L.;Shapiro, Beth
Understanding the population dynamics of megafauna that inhabited the mammoth steppe provides insights into the causes of extinctions during both the terminal Pleistocene and today. Our study area is Alaska's North Slope, a place where humans were rare when these extinctions occurred. After developing a statistical approach to remove the age artifacts caused by radiocarbon calibration from a large series of dated megafaunal bones, we compare the temporal patterns of bone abundance with climate records. Megafaunal abundance tracked ice age climate, peaking during transitions from cold to warm periods. These results suggest that a defining characteristic of the mammoth steppe was its temporal instability and imply that regional extinctions followed by population reestablishment from distant refugia were characteristic features of ice-age biogeography at high latitudes. It follows that long-distance dispersal was crucial for the long-term persistence of megafaunal species living in the Arctic. Such dispersal was only possible when their rapidly shifting range lands were geographically interconnected. The end of the last ice age was fatally unique because the geographic ranges of arctic megafauna became permanently fragmented after stable, interglacial climate engendered the spread of peatlands at the same time that rising sea level severed former dispersal routes.
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DOI:
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发表时间:
2004
期刊:
影响因子:
--
作者:
J. BrighamGrette;A. Lozhkin;P. Anderson;O. Glushkova
通讯作者:
O. Glushkova
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
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DOI:
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1994
期刊:
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作者:
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DOI:
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发表时间:
2009
期刊:
Radiocarbon: An International Journal of Cosmogenic Isotope Research
影响因子:
--
作者:
I. Hajdas;A. Michczyński;G. Bonani;L. Wacker;H. Furrer
通讯作者:
H. Furrer
影响因子:
4
作者:
D. Mann;D. Peteet;R. Reanier;M. Kunz
通讯作者:
M. Kunz