The consequences of craniofacial integration for the adaptive radiations of Darwin's finches and Hawaiian honeycreepers.
The consequences of craniofacial integration for the adaptive radiations of Darwin's finches and Hawaiian honeycreepers.
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颅面整合对达尔文雀和夏威夷蜜旋雀适应性辐射的影响。
DOI：
10.1038/s41559-019-1092-y
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发表时间：
2020
影响因子：
16.8
通讯作者：
Navalón G
中科院分区：
文献类型：
--
作者：
Navalón G
达尔文雀和夏威夷蜜雀的多样化是鸟类适应辐射的两个教科书例子。为什么这两个鸟类群体辐射，而在这两个群岛的其余特有鸟类表现出相对较低的多样性和差异仍然无法解释。生态因素未能提供一个令人信服的答案，这一现象，和一些内在的原因连接到颅面进化已被假设。在白天活动的猛禽和鹦鹉的喙和头骨的其余部分的紧密的共同进化表明，整合可能是陆生鸟类（Inopinaves）的普遍条件。这与达尔文的雀类和夏威夷蜜雀的喙形和生态之间的原型关系形成对比，这表明喙可以作为这些鸟类的一个独特模块进行适应。因此，模块化被提出来支持这些群体的适应性辐射，使喙能够更快、更自由地进化以应对生态机会。在这里，使用几何形态测量学和系统发育的比较方法在广泛的样本中的陆生鸟类头骨，我们表明，颅面进化在达尔文的雀和夏威夷的蜜雀似乎是一个更紧密的共同进化的喙和其他头骨（颅整合）比大多数陆生鸟类血统的特点，与快速和极端的形态进化的两个头骨区域沿着约束方向的表型空间。这些模式在陆地鸟类中是独一无二的，包括其他同域岛屿辐射，因此，通过显示更紧密的颅整合，不仅模块化，可以促进进化沿着适应方向，从而反驳了以前的假设。
The diversifications of Darwin’s finches and Hawaiian honeycreepers are two text-book examples of adaptive radiation in birds. Why these two bird groups radiated while the remaining endemic birds in these two archipelagos exhibit relatively low diversity and disparity remains unexplained. Ecological factors have failed to provide a convincing answer to this phenomenon, and some intrinsic causes connected to craniofacial evolution have been hypothesized. The tight coevolution of the beak and the remainder of the skull in diurnal raptors and parrots suggests that integration may be the prevalent condition in landbirds (Inopinaves). This is in contrast with the archetypal relationship between beak shape and ecology in Darwin’s finches and Hawaiian honeycreepers, which suggests that the beak can adapt as a distinct module in these birds. Modularity has therefore been proposed to underpin the adaptive radiation of these groups, allowing the beak to evolve more rapidly and freely in response to ecological opportunity. Here, using geometric morphometrics and phylogenetic comparative methods in a broad sample of landbird skulls, we show that craniofacial evolution in Darwin’s finches and Hawaiian honeycreepers seems to be characterized by a tighter coevolution of the beak and the rest of the skull (cranial integration) than in most landbird lineages, with rapid and extreme morphological evolution of both skull regions along constrained directions of phenotypic space. These patterns are unique among landbirds, including other sympatric island radiations, and therefore counter previous hypotheses by showing that tighter cranial integration, not only modularity, can facilitate evolution along adaptive directions.