Evolution of bite force in Darwin's finches: a key role for head width
Evolution of bite force in Darwin's finches: a key role for head width
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DOI：
10.1111/j.1420-9101.2004.00857.x
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发表时间：
2005-05-01
影响因子：
2.1
通讯作者：
Hendry, AP
中科院分区：
文献类型：
--
作者：
Herrel, A;Podos, J;Hendry, AP
对加拉帕戈斯群岛达尔文雀的研究为生态变异、自然选择和形态进化之间的相互作用提供了关键的见解。在这里，我们记录了九种达尔文雀物种的形态变异和咬合力之间的相关性。我们发现咬合力与喙的深度和宽度密切相关，但与喙的长度只有微弱的相关性或根本没有相关性，这一结果与先前对雀鸟喙形态的自然选择的论证是一致的。我们还发现，头部宽度对咬合力的预测能力更强，其预测强度超过了所有喙尺寸。为了解释这个结果，我们认为头部宽度决定了雀科下颌内收肌的最大尺寸，从而决定了最大的发力能力。我们认为头部宽度与功能相关，并且可能是这些鸟类以前未被识别的自然选择位点，因为它与咬合力能力密切相关。
Studies of Darwin's finches of the Galapagos Islands have provided pivotal insights into the interplay of ecological variation, natural selection, and morphological evolution. Here we document, across nine Darwin's finch species, correlations between morphological variation and bite force capacity. We find that bite force correlates strongly with beak depth and width but only weakly or not at all with beak length, a result that is consistent with prior demonstrations of natural selection on finch beak morphology. We also find that bite force is predicted even more strongly by head width, which exceeds all beak dimensions in predictive strength. To explain this result we suggest that head width determines the maximum size, and thus maximum force generation capacity of finch jaw adductor muscles. We suggest that head width is functionally relevant and may be a previously unrecognized locus of natural selection in these birds, because of its close relationship to bite force capacity.