Cause the extinction of mammoths

Researchers have found evidence that a major factor in prompting mammoth extinction is climate change rather than humans.

 

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That the mammoth is strong, prolific species will change the traditional view

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Researchers 300 mammoth DNA samples for analysis

A DNA analysis showed that when the world’s climate changes, the number of mammoths earlier than we previously thought there was a decrease. Many researchers believe that the mammoth is a strong and prolific species. But according to the study’s chief scientist, the Swedish Museum of Natural History, Dr. Love Dalen said the study changed this view. Dr. Dalen researchers analyzed DNA samples from 300 mammoth, these samples are their own and earlier studies collected from other teams. They are able to analyze samples from any given time the number of surviving mammoths, and track their migration patterns. They analyzed the genetic diversity of the sample, the less change in population size is lower.

They found that when global warming 120,000 years ago, when this species is almost extinct, population dropped from a few million to tens of thousands. But when the Earth into another ice age, the population began to recover them. The researchers also found that lead to the extinction of populations to reduce their start in the Ice Age 20,000 years ago, the peak period, but not before that 1.4 million years ago when the Earth is heating up again.They conclude that the climate is so cold causes them to become less grass survival. When the end of the Ice Age, the acceleration of population decline, perhaps because their survival grasslands are replaced by forests and tundra.

Mammoth extinction has always been more than science to argue the issue. Some people think that human hunting led to their extinction, while others believe that climate change is a major factor. Recent research results show that during the Ice Age mammoth indeed almost extinct, and support for climate change is their main point of extinction. Swedish Museum of Natural History Professor Adrian Lister, including humans, other animals become more active after the Ice Age, so compete with other species, and hunting and perhaps also their extinction factor, but not the main reason. He said: “Around 20,000 years ago, mammoth populations decreased, first in continental regions, and finally some of the remote Arctic archipelago. This pattern seems to coincide with climate change, but the process of human The role has not yet been confirmed. ”

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