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保护海洋哺乳动物-英语科普

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既然海洋中有如此丰富的食物,一些原本在陆地生存的高效率的,适应性强的暖血型动物返回海洋生存是不难理解的。那些曾经繁荣的国家。在大约5000万年的时间里——这在地质学上不过是弹指一段时间——返回海洋的四种浦乳动物之一的鲸已成为体积最大的动物。第二种,海豹,可能是地球上最大的食肉哺乳动物种群。这表明这些海洋中的“领头狗”正在繁荣繁殖。然而,至少在过去的150年里,情况并非如此。这些哺乳动物同样是温血动物,甚至是更高效、适应性更强的捕食者——人类,它们的麻烦已经逼近。在海洋上,就像在陆地上一样,人类现在把自己置于整个生命金字塔的顶端,这给海洋哺乳动物带来了严重的问题。原因很简单。不幸的是,海洋哺乳动物是人类想要的商品的海洋集合体:皮毛、石油和肉类。即便如此,如果它们不像人类那样繁殖如此缓慢,它们也不会如此容易受到人类的掠夺。每年,人类从海洋中捕捞超过5000万吨的鱼类,却没有严重消耗任何物种的数量。但是繁殖缓慢的海洋哺乳动物已经被人类为了满足他们的需求和奇想而灭绝。


Since there is such an abundance of food in the sea,it is understandable that some of the efficient, highly adaptable, warm-blooded mammals that evolved on land should have returned to the sea.Those that did have flourished. Within about 50 million years -- no time at all, geologically speaking -- one of the four kinds of mammals that has returned to a marine environment has developed into the largest of all animal forms, the whale. A second kind, the seal,has produced what is probably the greatest population of large carnivorous mammals on Earth. This suggests that these "top dogs" of the ocean are prospering and multiplying. However, such has not been the case,at least not for the last 150 years.Trouble has closed in on these mammals in the form of equally warm-blooded and even more efficient and adaptable predators, humans. At sea, as on land, humans have now positioned themselves on the top of the whole great pyramid of life, and they have caused serious problems for the mammals of the sea. There is a simple reason for this. Marine mammals have the misfortune to be swimming aggregates of commodities that humans want: fur, oil and meat. Even so, they might not be so vulnerable to human depredation if they did not,like humans, reproduce so slowly. Every year humans take more than 50 million tons of fish from the oceans without critically depleting the population of any species. But the slow-breeding mammals of the sea have been all but wiped out by humans seeking to satisfy their wants and whims.
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