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美国科技网站The Verge 5月22日文章,原题:中国大雁太乖反倒于己不利面临死亡 中国大雁太乖,反倒于己不利,导致野生大雁的数量不断下降。不管自己栖身的湿地有没有足够的吃的,野生的大雁就是不离开湿地去附近的农田找吃的。
众所周知,大雁秋天会迁徙去温暖的地方过冬。一些大雁冬天飞去欧洲和北美,这些迁徙的鸟儿日子过得都不错。不过冬天从寒冷的蒙古国和俄罗斯高原地区飞到中国南部气候较温和的长江流域的大雁可就没有这么潇洒了。有科学家在飞往中国过冬的67只大雁身上安装了跟踪设备,在整个冬季跟踪观察它们。观察发现,这67只大雁属于5个不同的种群。其中两个种群的大雁冬天过得不错,有时会飞到稻田里去找吃的。有50只大雁属于其他种群,这些种群的大雁数量都在下降,因为它们从不离开自己栖息的湿地。这让它们生存完全受制于自然环境,这并不是好消息,因为中国的湿地环境质量正变得越来越糟糕。该报告也发表在《当代生物学》期刊上。
当然,飞到附近稻田找吃的也有不利的一面。稻田里有人类活动,人总是喜欢抓捕或猎杀大雁。此外,农民家里也会养鹅,这也导致大雁即便飞出去也可能找不到什么吃的。不过,飞出去找吃的显然是值得一试的,可我们不知道为什么某些种群的大雁就是宁愿把自己囚死在食物不够的地方。(甄翔译)
责任编辑:杨晓晨 CN067
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