英语资讯
News

科学美国人60秒:Earlier Springs May Mean Mistimed Bird Migrations

Source: scientificamerican    2018-09-14  我要投稿   论坛   Favorite  

Climate change means springtime's arriving earlier across North America. But the season's onset isn't changing at the same rate across the nation.

"Spring is not advancing as quickly in southern regions as it is in northern regions." Eric Waller, a biogeographer at the U.S. Geological Survey. 

He and his team analyzed more than a hundred years of data on when the first leaves and flowers emerge across North America. And they found that although spring has sprung earlier nearly everywhere, in certain wildlife refuges, the season hits extremely early. 

And that mismatch could be a problem for migratory birds, who might leave their temperate overwintering grounds down south at the usual time, only to find they've arrived up north too late. "Their food resources might be withering and they might not have as much food available to them. And that could affect their reproduction, their breeding."

The analysis is in the journal PLOS ONE. [Eric K. Waller et al., Differential changes in the onset of spring across US National Wildlife Refuges and North American migratory bird flyways] 

The upshot: it may be more difficult than we thought to predict the effects of climate change on migratory birds. But the data might help land managers decide which plots of land to acquire, to augment existing reserves—and in doing so, ensure that even later birds still get the worm.

—Christopher Intagliata


将本页收藏到:
上一篇:科学美国人60秒:Survey the Wildlife of the "Great Indoors"
下一篇:返回列表

最新更新
论坛精彩内容
网站地图 - 学习交流 - 恒星英语论坛 - 关于我们 - 广告服务 - 帮助中心 - 联系我们
Copyright ©2006-2007 www.Hxen.com All Rights Reserved