美国东南地区濒危海龟筑巢数量大幅上升
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分类: 环境与能源 |
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自然资源保护人士说,濒危海龟正在美国东南沿海以创纪录的数量筑巢——这是30年联邦保护工作的结果,但是它们的长期前景仍然令人堪忧。
自然资源保护人士说,濒危海龟正在美国东南沿海以创纪录的数量筑巢——这是30年联邦保护工作的结果。但是根据来自美国鱼类和野生动植物管理局的消息,海龟专家们担心该物种的长期前景可能不佳,原因是海洋污染和上升的海平面造成了威胁。
佛罗里达州(Florida)霍布湾国家野生动物保护区(Hobe Sound National Wildlife Refuge)经理比尔•米勒说:“绿海龟的巢穴数量已达到超高的水平。”在该保护区2013年8月中旬发现有1,147个巢穴,比2011年的543个的记录增加了一倍以上。在佛罗里达州阿奇•卡尔国家野生动物保护区(Archie Carr National Wildlife Refuge),到8月21日为止,绿海龟共筑巢10,420个,超出了2011年的6,023个的记录。筑巢季节于11月份结束。
如上图所示的红海龟筑巢数量也在上升。经理莎拉•道西(Sarah Dawsey)说,到8月中旬为止,在南卡罗来纳州(South Carolina)罗曼角国家野生动物保护区(Cape Romain National Wildlife Refuge),红海龟筑巢1,878个——比2012年多了至少200个,创1978年以来数量之最,当年该物种被列为国家保护动物。
1978年,绿海龟被列入《濒临灭绝物种法》(Endangered Species Act)保护名单,受联邦政府保护,捕杀和钓捕都属非法。海龟需要20至30年时间才能到达性成熟,这说明2013年海龟筑巢数量有可能反映了几十年前开始的过程。
但是筑巢数量的增加需要多长时间才能抵消威胁造成的损失,依然不得而知。米勒说:“如果我们不采取行动应对海洋垃圾、因水土流失而损毁的栖息地、海平面的上升、澈泻湖的污染和支流水位的上涨等问题,那么巢穴的增加就会被环境的恶化所抵消。”
野生动物保护在美国已有很长的历史,美国处在国际保护野生动物工作的前沿。
Read more: http://iipdigital.usembassy.gov/st/chinese/inbrief/2013/09/20130906282346.html#ixzz2eeuUs6yb
Nesting of Endangered Turtles Up Dramatically in U.S. Southeast
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Along the U.S. southeast coast, endangered sea turtles are nesting in record numbers — the result of 30 years of federal protection efforts, say conservationists, but their long-term outlook remains problematic.
Along the U.S. southeast coast, endangered sea turtles are nesting in record numbers — the result of 30 years of federal protection efforts, say conservationists. But turtle experts worry about a poor long-term outlook for the animals because of threats such as ocean pollution and rising sea levels, according to the U.S. Fish and Wildlife Service.
“Green turtle nest numbers are through the roof,” says Bill Miller, manager of Hobe Sound National Wildlife Refuge in Florida, where a mid-August 2013 count of 1,147 more than doubled the 2011 record of 543. At Archie Carr National Wildlife Refuge in Florida, green turtles had built 10,420 nests by August 21, topping the 2011 record of 6,023. Nesting season ends in November.
Loggerheads, such as the one shown above, are also posting nest gains. By mid-August, loggerheads had built 1,878 nests at Cape Romain National Wildlife Refuge in South Carolina — 200 more than in 2012 and the highest count since 1978, when the species won national protection, says manager Sarah Dawsey.
The listing of green sea turtles under the Endangered Species Act in 1978 provided federal protections, including making it illegal to hunt or fish them. Turtles take 20 to 30 years to reach sexual maturity, which is why the 2013 nesting gains may reflect actions begun decades earlier.
But how long nesting gains will offset threats is unknown. Says Miller, “If we don’t do something about ocean debris, loss of habitat to erosion and sea level rise, and the pollution of lagoons and estuaries from runoff, nesting gains will be outweighed by environmental degradations.”
Wildlife conservation has a long history in the United States, and the United States is at the forefront of international efforts to protect wildlife.
Read more: http://iipdigital.usembassy.gov/st/english/inbrief/2013/09/20130901282103.html#ixzz2eeuXyQtI

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