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    【濒临灭绝的兔子】濒临灭绝的鼠类

    时间:2019-02-02 04:28:27 来源:达达文档网 本文已影响 达达文档网手机站

      海伦 菲尔兹   合肥工业大学 常韦娜 译       Eight years ago the smallest rabbits in North America were nearly extinct in Washington State. While pygmy rabbits live in several western states, the population in the Columbia River Basin has been isolated for thousands of years and is on the endangered species list. As the rabbits’ sagebrush steppe habitat was converted to agriculture, their numbers fell; in 2001, fewer than 30 were known to live in the state. Biologists trapped 16 rabbits and began a captive-breeding program. But the one-pound pygmies couldn’t make healthy babies, so Idaho relatives were imported to broaden the gene pool. Today about 80 live in captivity. On March 13, 2007, scientists released 20 rabbits, which scampered into drainage pipes that serve as temporary burrows. But by September, predators had eaten all except one. Biologists are thinking of ways to make a second release go better: for example, placing the rabbits in a fenced-off area or even getting rid of some of those wily coyotes.
      
       8年前,北美身材最小的兔子在华盛顿州几近灭绝了。侏儒兔生活在西部几个州,而哥伦比亚河盆地的种群与外界隔离了几千年,已经濒临灭绝。随着兔子赖以存活的大草原被开垦成农业耕地,兔子的数量下降了。到2001年,这个州只有不到30只兔子。生物学家带走16只兔子,开始了圈养计划。但是,一磅重的侏儒兔没法产下健康的小兔子,所以爱达荷州同属兔子被引进以扩大基因库。现在大约有80只兔子被圈养。2007年3月13日,科学家放生了20只,惊惶的兔子把下水管道当做暂时的栖身之穴。但是不到9月份,其中19只兔子被它的天敌吃光了。生物学家想方设法改善第二次放生情况:比如说,让兔子生活在没有篱笆的开放地区,或者赶走那些野生的郊狼。(责编:张雯)

    相关热词搜索: 濒临 灭绝 兔子

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