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Scientists have recreated a 1985 study of birds in Peru that shows climate change is pushing them from their natural environment.
Thirty years ago, researchers studied more than 400 kinds of birds living on a mountainside in Peru.
In 2017, researchers looked again at the bird populations.
They found that almost all had moved to higher places in the mountain. Almost all had decreased in size.
And, the scientists say at least eight bird groups that started at the higher elevations had died out completely.
John W. Fitzpatrick is director of the Cornell Laboratory of Ornithology and a co-writer of the study.
He said, Once you move up as far as you can go, there's nowhere else left.
The researchers say the birds might have moved up the mountain because of temperature changes.
Or, they say, changes to food sources may have forced them to go higher.
The findings were published in the Proceedings of the National Academy of Sciences.
Past research has documented birds and other animals moving up in elevation in reaction to warming temperatures.
数位科学家重新进行了1985年在秘鲁的鸟类研究。该研究表明,气候变化正在迫使鸟类从大自然灭绝。
30年前,多位科学家研究了400多种生活在秘鲁山坡的鸟类。
2017年,科学家回顾了这些鸟类的数据。
他们发现,几乎所有鸟类都迁徙到了山上更高的地方。几乎鸟类体型都变小了。
此外,该研究的科学家还表示,至少8种鸟类原本生活在更高的海拔上,但现在已经彻底灭绝了。
约翰是康奈尔鸟类学实验室的负责人,也是该研究的一位署名作者。
他表示,越往上看,越了无生趣。
研究人员表示,这些鸟类之所以往上迁徙是因为气温变化。
也就是说,食物来源的变化可能迫使它们向上迁徙。
他们的发现成果发表在了《美国国家科学院院刊》上。
以前有研究发现鸟类等动物会随着气温的升高而向上迁徙。
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