Författare Ämne: Nya DNA-studier tyder på att de sista mammutarna dog ut snabbt  (läst 1137 gånger)

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Nya DNA-studier tyder på att Wrangel-öns mammutar dog ut snabbt. De kan ha blivit utrotade av människan eller fallit offer för sjukdomar eller någon väderkatastrof. De sista av dessa mammutar dog troligen ut så sent som för 3700 år sedan:

Citera
The last known population of woolly mammoths, roaming a remote Arctic island long after humans invented writing, were wiped out quickly, reports a study released Wednesday.

The culprit might have been disease, humans or a catastrophic weather event, but was almost certainly not climate change, suggests the study, published in the Proceedings of the Royal Society B.

http://sg.news.yahoo.com/afp/20100331/tts-science-archaeology-mammoth-genetics-c1b2fc3.html


Citera
During the Late Pleistocene, the woolly mammoth (Mammuthus primigenius) experienced a series of local extinctions generally attributed to human predation or environmental change. Some small and isolated populations did however survive far into the Holocene. Here, we investigated the genetic consequences of the isolation of the last remaining mammoth population on Wrangel Island. We analysed 741 bp of the mitochondrial DNA and found a loss of genetic variation in relation to the isolation event, probably caused by a demographic bottleneck or a founder event. However, in spite of ca 5000 years of isolation, we did not detect any further loss of genetic variation. Together with the relatively high number of mitochondrial haplotypes on Wrangel Island near the final disappearance, this suggests a sudden extinction of a rather stable population.

http://rspb.royalsocietypublishing.org/content/early/2010/03/24/rspb.2010.0301.abstract?sid=650ac283-86d7-41eb-b09e-a934755f73bd