species in South America, the jaguar and giant saber-toothed cat, and huge one ton of short-faced bear (the largest terrestrial carnivore mammal) is widely found throughout the country in South America Patagonia, but seemed to disappear shortly after humans arrived. Researchers have found that a perfect storm of rapid climate warming and human activities killed these giant species of ice age.
human activities and climate change Addressed to the extinction of the giant Ice Age species
Human activity that gradually lead to climate warming caused the extinction of megafauna around 12,300 years ago, researchers say.
“A perfect storm of rapid climate warming and human activities killed species of giant ice age sloth including size of an elephant and powerful saber-toothed tiger. “
“The study shows that human colonization did not immediately result in extinctions, but only time that remained cold,” said lead researcher Alan Cooper, a professor at the University of Adelaide in Australia.
The pattern of rapid human colonization through the Americas, coinciding with contrasting temperature trends on every continent, enabled researchers to unravel the relative impact of human arrival and climate change.
“More than 1,000 years of human occupation passed before it occurred an event of rapid heating, and then the megafauna became extinct within a hundred years,” added Cooper at work in the journal Science advances .
The only large species to survive were the ancestors of the present day llama and alpaca, according to the researchers.
“The ancient genetic data show that only the late arrival in Patagonia guanaco population of northern saved the species, all other populations are extinct,” said Jessica Metcalf, University of Colorado-Boulder, in the US ..
“In the cave 1936 Fell, a small stone shelter in Patagonia, was the first place in the world to prove that humans had hunted megafauna ice age. Therefore, it seems appropriate that we are now using bones the area to reveal the key role of global warming, and humans in the extinctions of megafauna, “said Fabiana Martin of the University of Magallanes in Chile.
The team studied the ancient DNA extracted from bones and teeth radiocarbon dated found in caves in Patagonia and Tierra del Fuego, to trace the genetic history of populations
Source :. IANS
This article was originally published on medindia.net
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