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鳥喙的形狀進化 不僅僅取決于食物

kira86 于2019-06-03發布 l 已有人瀏覽
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科學家之前一直認為鳥喙的形狀與鳥類的食物以及進食方式有關,而研究改變了這一假說,或許有多中因素決定了鳥嘴的進化。
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广东36选7好彩3开奖奖金多少 www.oabxa.com Bird Beak Shapes Depend on More Than Diet

鳥喙的形狀不僅僅取決于食物

The shape of the beaks of different species of Galapagos finches played an important part in Darwin's conception of natural selection.“In our field there is this presumption that the beak shape…in birds is quite correlated with what they eat and how they eat it. So, their feeding ecologies.”

加拉帕戈斯群島不同雀類的鳥嘴(喙)形狀,在達爾文的物競天擇構想中扮演著重要的角色。“在我們的研究領域,有這樣一種假說:鳥類的喙形與它們所吃的食物以及進食方式息息相關,即與它們的覓食生態學有關。”

Guillermo Navalón, a PhD student at the University of Bristol in the U.K., and a co-author of a new study that found that the connection between beak shape and diet isn't as tight as we thought. The study is in the journal Evolution.

吉爾莫·納瓦隆是英國布里斯托爾大學的博士生,也是一項發現喙的形狀和飲食之間的聯系并不像我們想象的那么緊密的新研究的共同作者。這項研究發表在《進化》雜志上。

Navalón and his colleagues analyzed photographs of museum specimens of 176 bird skulls. They looked at beak shape and size in almost all of the orders of modern birds, and compared the beaks with other factors, such as feeding behavior and body size. And they found that the beak shape was indeed somewhat tied to what birds feed on and how they eat it - but the relationship was actually surprisingly weak, accounting for just 12 percent of beak shape variation.

納瓦隆和他的同事分析了博物館176個鳥類頭骨標本的照片。他們研究了幾乎所有現代鳥類的喙的形狀和大小,并將喙與比如進食行為與體型等其它因素進行了比較。他們發現,鳥喙的形狀確實在某種程度上與鳥以什么為食以及它們如何進食有關,但這種關聯實際上出奇的微弱,只占鳥喙形狀變化因素的12%。

“The explanation that we extract from there is that the beaks are basically surrogate hands in the birds. They are used for a plethora of different functions beyond feeding ecology. Like the beak in general in birds have many other functions. So they use it for display, nest construction, singing, thermoregulation in some cases like toucans or like hornbills…so there is like a lot of factors that probably have intervened in the evolution of beaks in birds.”

“我們從中得出的解釋是,喙基本上是鳥類的手。手除了被用來進食以外,還有許多其它不同的作用,就如鳥類的喙還有很多其它的功能一般。鳥喙可以用來炫耀筑巢、唱歌,某些鳥類如犀鳥(或稱巨嘴鳥)還可以用喙來調節體溫,所以可能有很多因素影響了鳥喙的進化。”

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