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Humans exonerated of killing off the American giant animals

Humans exonerated of killing off the American giant animals
haaretz.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from haaretz.com Daily Mail and Mail on Sunday newspapers.

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Extinction of North America's largest animals likely caused by ancient climate change

Extinction of North America’s largest animals likely caused by ancient climate change
Louise Boyle
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The Independent launches Independent Climate
Ancient climate change was likely behind the extinction of North America’s largest pre-historic animals, according to new research.
Earlier studies have suggested that growing numbers of “big-game” hunting humans in the Americas some 14,000 years ago led to large mammals being wiped out.
But the new study, from the Max Planck “Extreme Events” research group in Jena, Germany, proposes that populations of megafauna fluctuated due to climate change.
Around 13,000 years ago populations of creatures such as mammoths, massive ground-dwelling sloths, giant beavers, and a huge armadillo-like species called glyptodons began to drop off. By around 10,000 years ago these creatures, classed as megafauna because they weighed more than 44kg, had vanished. ....

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Climate Change Likely Drove Extinction of North America's Largest Animals

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Climate Change Likely Drove Extinction of North America’s Largest Animals
New research suggests that overhunting by humans was not responsible for the extinction of mammoths, ground sloths, and other North American megafauna.
A new study published in Nature Communications suggests that the extinction of North America’s largest mammals was not driven by overhunting by rapidly expanding human populations following their entrance into the Americas. Instead, the findings, based on a new statistical modelling approach, suggest that populations of large mammals fluctuated in response to climate change, with drastic decreases of temperatures around 13,000 years ago initiating the decline and extinction of these massive creatures. Still, humans may have been involved in more complex and indirect ways than simple models of overhunting suggest. ....

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Climate change likely drove the extinction of North America's largest animals

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IMAGE: The study s findings suggest that decreasing hemispheric temperatures and associated ecological changes were the primary drivers of the Late Quaternary megafauna extinctions in North America.
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Credit: Hans Sell
A new study published in
Nature Communications suggests that the extinction of North America s largest mammals was not driven by overhunting by rapidly expanding human populations following their entrance into the Americas. Instead, the findings, based on a new statistical modelling approach, suggest that populations of large mammals fluctuated in response to climate change, with drastic decreases of temperatures around 13,000 years ago initiating the decline and extinction of these massive creatures. Still, humans may have been involved in more complex and indirect ways than simple models of overhunting suggest. ....

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North American extinctions, including horses, were likely climate driven, say researchers

Horsetalk.co.nz
North American extinctions, including horses, were likely climate driven, say researchers
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The Max Planck Extreme Events Research Group, from left, W. Christopher Carleton, Mathew Stewart, Huw Groucutt and Angela Kiesewetter. Photo: MPI-CE
Overhunting by humans was not responsible for the extinction of horses, mammoths, ground sloths, and other North American megafauna, the findings of fresh research suggest.
Scientists say the latest evidence supports the view that climate change was behind the loss of some 37 species of megafauna a little over 10,000 years ago, near the end of the Pleistocene epoch.
Their findings, reported in the journal
Nature Communications, do not support a hypothesis, first discussed as far back as the late 18th century, that the extinctions arose by overhunting by expanding human populations following their entrance into the Americas. ....

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