一条鱼从畅游在开阔水面进化成洞穴寄居者需要多长时间?一项新研究显示,只要几千年。科学家曾认为冰河时代,北欧被冰川覆盖,从而阻止鱼类“殖民”该大陆的洞穴。因此,人们曾认为这些洞穴鱼物种的栖息地北部边缘不会超过宾夕法尼亚州的尼珀诺斯山谷。但2年前,科学家在德国南部新发现了一种洞穴鱼打破了这一界限。这种苍白的小鱼头部有长长的胡须状倒刺,是泥鳅的一个新物种。这种鱼还是在欧洲首次发现的洞穴鱼,栖息范围比宾夕法 How long does it take for a fish to swim in open caverns to open up a cave? A new study shows that it takes only a few thousand years. Scientists have argued that during the Ice Age, northern Europe was covered by glaciers, thereby preventing fish from “colonizing” the caves of the continent. Therefore, it has been thought that the northern edge of the habitat of these cavefish species does not surpass the Pennine Valley in Pennsylvania. But two years ago scientists discovered a new type of cave fish in southern Germany that broke that line. This pale fish head has long bearded barb, is a new species of loach. This fish is still the first cave fish found in Europe, habitat than Pennsylvania