英語聽力文摘495 魚兒如何相親

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Fish Blind Dates

There are plenty of examples in nature of females being attracted to the biggest males. This is especially true for a species of fish called the Atlantic Mollie.

The Mollie wants to be as big a fish as possible, because the females show more interest in big fellows than little ones. What’s interesting, though, is what happens with Mollies that live in caves.

Why should they be any different?

Because the caves in question are pitch black. None of the female Mollies can see any of the male Mollies. That could be Arnold Schwarzen-Mollie swimming up next to you, or it could be Mini-Me Mollie; you can’t tell by looking. So which males do you think the female Mollies spent most time around?

I guess they will be random.

That's surprise. When researchers at Hamburg University in Germany studied sexual preference in Mollies that lived in caves, they found the same pattern as in Mollies living outside caves–the females preferred the larger males.

But how did the fish know?

Researchers aren’t sure yet. A good guess, though, is that the cave-dwelling Mollies use organs that sense water displacement. Possibly first involve help them find food. Arnold Schwartzen-Mollie displaces more water than Bill Gates-e-Mollie, so he’ll do better–even on blind dates.

自然界中有很多雌性動物被體積最大的雄性動物吸引的例子。這真實體現(xiàn)在一種叫做大西洋摩利的魚身上。

摩利魚想變得盡可能龐大，因為雌性摩利魚對大的雄性魚比小的更感興趣。然而，有趣的是穴居的摩利魚身上所發(fā)生的事。

為什么他們會與眾不同呢?

因為所談及的洞穴是漆黑一片。沒有一只雌性摩利魚能看見任何雄性摩利魚。游到你身邊的可能是阿諾德.施瓦岑摩利魚，也可能是迷你小魚，你不可能通過視覺辨認。所以你認為雌性摩利會花更多時間在哪只雄性摩利身邊呢?

我猜它們會隨機選吧。

真讓人吃驚!當?shù)聡鴿h堡大學(xué)的研究者們研究穴居的摩利魚的性偏好時，他們發(fā)現(xiàn)這些摩利魚和洞外的摩利魚有相同的取向——雌性摩利偏愛體積更大的雄性魚。

但魚是怎么知道(哪只魚更大)的呢?

研究者還不確定。但是有一種較好的猜測認為穴居的摩利魚是使用器官來感知排出的水。也許還包括幫它們找到食物。阿諾德.施瓦岑摩利能比比爾.蓋茨摩利排出更多的水。所以它們能做的更好，即使是相親。