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小小的蜗牛也可以很惊艳

所属:时尚界 作者:国家地理 来源:国家地理 阅读:5031 次 评论:6 条 [我要评论]  [+我要收藏]

小编摘要:普通的小动物也可以有惊艳的魅力!蜗牛通常给人的印象是不太好的,或者是法国大餐中的一道美食,今天跟随国家地理杂志来看看蜗牛的另一面

 

Jellyfish Dinner

Photograph by David Fleetham, Alamy

蜗牛是陆地上最常见的软体动物之一,它主要以植物为食,特别喜欢吃作物的细芽和嫩叶,所以野生的蜗牛对农作物危害较大。随着科学的发展,人们变害为利,把蜗牛进行人工饲养,让蜗牛为人类提供营养价值很高的蜗牛肉。

A bubble-rafting violet snail feeds on a Portuguese man-of-war in Hawaii.

Churchill and colleagues have a theory for how the snails' bottom-dwelling ancestors took to rafting.

They hypothesize that at some point, a female living near the coast may have been briefly carried—along with her egg mass—by waves. This led to temporary periods of rafting. Eventually this ancestor lineage evolved the ability to create bubbles with their mucus and make rafts on purpose.

"Obviously, the ability to add bubbles probably didn't evolve overnight," Churchill emphasized. "It would have been over some period of time, and eventually that lineage became successful at adding many bubbles together to create a float."

The evolutionary transition from bottom-dwelling to bubble-rafting gave snails access to new food sources at the surface, where they are relatively free from competition, Churchill said.

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2011-10-20 15:16 编辑:Fionafyy
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