Evidence contradicts idea that starvation caused saber-tooth cat extinction

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In the period just before they went extinct, the American lions and saber-toothed cats that roamed North America in the late Pleistocene were living well off the fat of the land. That is the conclusion of the latest study of the microscopic wear patterns on the teeth of these great cats recovered from the La Brea tar pits in southern California. Contrary to previous studies, the analysis did not find any indications that the giant carnivores were having increased trouble finding prey in the period before they went extinct 12,000 years ago.


The results, published on Dec. 26 in the scientific journal PLOS ONE, contradicts previous dental studies and presents a problem for the most popular explanations for the Megafaunal (or Quaternary) extinction when the great cats, mammoths and a number of the largest mammals that existed around the world disappeared.

“The popular theory for the Megafaunal extinction is that either the changing climate at the end of the last Ice Age or human activity — or some combination of the two — killed off most of the large mammals,” said Larisa DeSantis, assistant professor of earth and environmental sciences at Vanderbilt, who headed the study. “In the case of the great cats, we expect that it would have been increasingly difficult for them to find prey, especially if had to compete with humans. We know that when food becomes scarce, carnivores like the great cats tend to consume more of the carcasses they kill. If they spent more time chomping on bones, it should cause detectable changes in the wear patterns on their teeth.”

In 1993, Blaire Van Valkenburgh at UCLA published a paper on tooth breakage in large carnivores in the late Pleistocene. Analyzing teeth of American lions, saber-tooth cats, dire wolves and coyotes from La Brea, she found that they had approximately three times the number of broken teeth of contemporary predators and concluded, .” ..these findings suggest that these species utilized carcasses more fully and likely competed more intensely for food than present-day large carnivores.”

Written By: e! Science News
continue to source article at esciencenews.com

7 COMMENTS

  1. “… their teeth tell us that these cats were not desperately consuming entire carcasses, as we had expected, and instead seemed to be living the ‘good life’ during the late Pleistocene, at least up until the very end.”

    And just how do they know that the specimens they collected were the very last of their kind? The remains were recovered from the LaBrea Tar Pits, flypaper central for Pleistocene megafauna. The sabertooth cats didn’t go there to die after gnawing the last bone. They got stuck while chowing down on some previous unfortunate. If there were no prey stuck in the tar, the cats wouldn’t have been there. Bones sink in tar and wouldn’t have been available for gnawing anyway.

  2. They’re implying that if the megafuana predators disappeared owing to starvation in response to the disappearance of megafauna prey then it must have happened quite quickly. Creating less opportunity to capture a trail of carcass evidence accumulating in tar pits over hundreds or thousands of years.
    Climate changes might be relatively slow.

    Continent-wide geological catastrophes would likely leave some kind of trace. So you’re left with human technology and intention as the cause of mass extermination.

    Humans are capable of extremely rapid megafauna exterminations of a massive scale. They have the means, opportunity, and motive. Sufficient to convict on the balance of probabilities, but not sufficiently certain to be beyond reasonable doubt.

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