People, not the climate, found to have caused the decline of the giant mammals
Phys.org ^ | December 14, 2023 | Aarhus University
Posted on 12/19/2024 3:50:53 PM PST by marktwain
For years, scientists have debated whether humans or the climate have caused the population of large mammals to decline dramatically over the past several thousand years. A new study from Aarhus University confirms that climate cannot be the explanation.
About 100,000 years ago, the first modern humans migrated out of Africa in large numbers. They were eminent at adapting to new habitats, and they settled in virtually every kind of landscape—from deserts to jungles to the icy taiga in the far north.
Part of the success was human's ability to hunt large animals. With clever hunting techniques and specially built weapons, they perfected the art of killing even the most dangerous mammals.
But unfortunately, the great success of our ancestors came at the expense of the other large mammals.
It is well-known that numerous large species went extinct during the time of worldwide colonization by modern humans. Now, new research from Aarhus University reveals that those large mammals that survived also experienced a dramatic decline.
By studying the DNA of 139 living species of large mammals, scientists have been able to show that the abundances of almost all species fell dramatically about 50,000 years ago.
This is according to Jens-Christian Svenning, a professor and head of the Danish National Research Foundation's Center for Ecological Dynamics in a Novel Biosphere (ECONOVO) at Aarhus University and the initiator of the study.
"We've studied the evolution of large mammalian populations over the past 750,000 years. For the first 700,000 years, the populations were fairly stable, but 50,000 years ago, the curve broke, and populations fell dramatically and never recovered," he says, and continues:
"For the past 800,000 years, the globe has fluctuated between ice ages and interglacial periods about every 100,000 years.
(Excerpt) Read more at phys.org ...
TOPICS: Culture/Society; Philosophy
KEYWORDS: biology; extinction; humans
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Good evidence humans killed off the megafauna, not climate change.
1 posted on 12/19/2024 3:50:53 PM PST by marktwain
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