Bentho-pelagic divergence of cichlid feeding architecture was prodigious and consistent during multiple adaptive radiations within African rift-lakes.
Bentho-pelagic divergence of cichlid feeding architecture was prodigious and consistent during multiple adaptive radiations within African rift-lakes.
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DOI：
10.1371/journal.pone.0009551
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发表时间：
2010-03-08
期刊：
影响因子：
3.7
通讯作者：
Albertson RC
中科院分区：
文献类型：
--
作者：
Cooper WJ;Parsons K;McIntyre A;Kern B;McGee-Moore A;Albertson RC
功能形态的特殊变化如何能够反复促进生态多样化是进化研究的一个活跃领域。非洲裂谷湖慈鲷提供了一个校准的时间序列的脊椎动物营养形态尚未描述的最显着的适应性辐射，这些事件的复制性质提供了一个独特的机会，以测试是否共同的变化功能形态一再促进其生态成功。对坦噶尼喀湖、马拉维湖和维多利亚湖特有的87个属的慈鲷科鱼类进行了解剖，以研究慈鲷科鱼类摄食的功能形态。我们量化的形状，使用几何形态测量学和形态多样性的模式，使用一系列的分析测试进行比较。在所有三种辐射中，发散的主轴是保守的，最普遍的变化涉及头骨眶前区的大小。即使是来自这些湖泊中最年轻的湖泊（维多利亚）的鱼类，其头骨形状差异最小，也经历了相对于其他颅面特征的广泛的眶前进化。这种变化对摄食生物力学有很大的影响，并可促进沿沿着一条底栖-远洋生态形态轴向扩展成一系列广泛的生态位。在这里，我们表明，在营养解剖的具体变化已经反复在非洲裂谷湖，我们的研究结果表明，简单的形态改变，有很大的生态后果可能构成适应辐射功能形态的关键组成部分。这样的转变可能先于更复杂的形状变化，因为谱系多样化到未占用的壁龛。这里提出的数据，结合其他鱼类谱系的观察，表明眶前区代表了一个进化模块，可以快速响应自然选择时，鱼类殖民新的湖泊。描述慈鲷营养形态的变化，有助于他们非凡的适应辐射具有广泛的进化意义，这样的研究是必要的，指导未来的调查近机制，塑造了这些壮观的现象。
How particular changes in functional morphology can repeatedly promote ecological diversification is an active area of evolutionary investigation. The African rift-lake cichlids offer a calibrated time series of the most dramatic adaptive radiations of vertebrate trophic morphology yet described, and the replicate nature of these events provides a unique opportunity to test whether common changes in functional morphology have repeatedly facilitated their ecological success. Specimens from 87 genera of cichlid fishes endemic to Lakes Tanganyka, Malawi and Victoria were dissected in order to examine the functional morphology of cichlid feeding. We quantified shape using geometric morphometrics and compared patterns of morphological diversity using a series of analytical tests. The primary axes of divergence were conserved among all three radiations, and the most prevalent changes involved the size of the preorbital region of the skull. Even the fishes from the youngest of these lakes (Victoria), which exhibit the lowest amount of skull shape disparity, have undergone extensive preorbital evolution relative to other craniofacial traits. Such changes have large effects on feeding biomechanics, and can promote expansion into a wide array of niches along a bentho-pelagic ecomorphological axis. Here we show that specific changes in trophic anatomy have evolved repeatedly in the African rift lakes, and our results suggest that simple morphological alterations that have large ecological consequences are likely to constitute critical components of adaptive radiations in functional morphology. Such shifts may precede more complex shape changes as lineages diversify into unoccupied niches. The data presented here, combined with observations of other fish lineages, suggest that the preorbital region represents an evolutionary module that can respond quickly to natural selection when fishes colonize new lakes. Characterizing the changes in cichlid trophic morphology that have contributed to their extraordinary adaptive radiations has broad evolutionary implications, and such studies are necessary for directing future investigations into the proximate mechanisms that have shaped these spectacular phenomena.
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影响因子：
3.3
作者：
Collar, DC;Near, TJ;Wainwright, PC
通讯作者：
Wainwright, PC
影响因子：
3.1
作者：
Albertson, RC;Streelman, JT;Kocher, TD
通讯作者：
Kocher, TD
DOI：
10.1073/pnas.96.9.5107
发表时间：
1999-04-27
影响因子：
11.1
作者：
Albertson, RC;Markert, JA;Kocher, TD
通讯作者：
Kocher, TD
DOI：
10.1073/pnas.0308479101
发表时间：
2004-03-09
影响因子：
11.1
作者：
Wexler, NS
通讯作者：
Wexler, NS
影响因子：
1.9
作者：
Bernatchez, L;Chouinard, A;Lu, GQ
通讯作者：
Lu, GQ