, two megafaunal carnivorans that dispersed from Eurasia into North America during the Pleistocene, to better understand the timing and drivers of their past movement between the continents across the Bering Land Bridge. Their results reveal striking synchronicity in the population dynamics of Beringian lions and brown bears, with multiple waves of dispersal across the Bering Land Bridge.
“There’s a common perception that outside of mass extinctions or direct human interference, ecosystems tend to remain stable over thousands or even millions of years,” added Dr. Kieren Mitchell, also from the Australian Centre for Ancient DNA at the University of Adelaide.“Previous research has shown that brown bears disappeared from some parts of North America for thousands of years prior to the latest Ice Age.
Among the team’s key findings is that cave lions from the same area became extinct more than once — before their final extinction they also disappeared and reappeared thousands of years later, around the same time as bears. The timing of lions and bear extinction from parts of North America — specifically Alaska and the Yukon Territory — coincides with evidence of widespread vegetation change in the region.
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