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Deprecated: Implicit conversion from float 263.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Proc+Natl+Acad+Sci+U+S+A 2014 ; 111 (52): 18460-5 Nephropedia Template TP
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American mastodon extirpation in the Arctic and Subarctic predates human colonization and terminal Pleistocene climate change #MMPMID25453065
Proc Natl Acad Sci U S A 2014[Dec]; 111 (52): 18460-5 PMID25453065show ga
New radiocarbon (14C) dates on American mastodon (Mammut americanum) fossils in Alaska and Yukon suggest this species suffered local extirpation before terminal Pleistocene climate changes or human colonization. Mastodons occupied high latitudes during the Last Interglacial (?125,000?75,000 y ago) when forests were established. Ecological changes during the Wisconsinan glaciation (?75,000 y ago) led to habitat loss and population collapse. Thereafter, mastodons were limited to areas south of the continental ice sheets, where they ultimately died out ?10,000 14C years B.P. Extirpation of mastodons and some other megafaunal species in high latitudes was thus independent of their later extinction south of the ice. Rigorous pretreatment was crucial to removing contamination from fossils that originally yielded erroneously ?young? 14C dates.