Ecological and evolutionary determinants for the adaptive radiation of the Madagascan vangas
Ecological and evolutionary determinants for the adaptive radiation of the Madagascan vangas
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DOI：
10.1073/pnas.1115835109
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发表时间：
2012-04-24
影响因子：
11.1
通讯作者：
Irestedt, Martin
中科院分区：
文献类型：
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作者：
Jonsson, Knud A.;Fabre, Pierre-Henri;Irestedt, Martin
适应性辐射是一个单一的谱系迅速多样化为许多物种，居住在各种环境或使用各种资源，并在利用这些资源所需的性状不同。为什么有些谱系会经历适应性辐射还不清楚，但填充未被占用的生态空间似乎是一个共同的特征。我们构建了一个完整的，过时的，物种水平的马达加斯加特有的Vangidae的genomy。雀形目鸟类辐射代表了一种经典的，但鲜为人知的，鸟类适应性辐射。我们的研究结果揭示了最初的快速增长的进化谱系和多样化的形态空间殖民马达加斯加后，在渐新世晚期约25万年。随后的关键创新涉及独特的法案形态与第二次增加的多样化率约10Mya。现代马达加斯加万格鸟所占据的形态空间在许多方面与其他更知名的适应性辐射生物（包括更年轻的加拉帕戈斯达尔文雀和夏威夷蜜雀）一样大（形状变化），甚至更大（大小变化）。形态空间承担密切的关系，饮食，基板的使用，和觅食运动，因此，我们的研究结果表明，在很大程度上的进化多样化的马达加斯加vangas。
Adaptive radiation is the rapid diversification of a single lineage into many species that inhabit a variety of environments or use a variety of resources and differ in traits required to exploit these. Why some lineages undergo adaptive radiation is notwell-understood, but filling unoccupied ecological space appears to be a common feature. We construct a complete, dated, species-level phylogeny of the endemic Vangidae of Madagascar. This passerine bird radiation represents a classic, but poorly known, avian adaptive radiation. Our results reveal an initial rapid increase in evolutionary lineages and diversification in morphospace after colonizing Madagascar in the late Oligocene some 25 Mya. A subsequent key innovation involving unique bill morphology was associated with a second increase in diversification rates about 10Mya. The volume of morphospace occupied by contemporary Madagascan vangas is in many aspects as large (shapevariation)-or even larger (sizevariation)-as that of other better-knownavian adaptive radiations, including the much younger Galapagos Darwin's finches and Hawaiian honeycreepers. Morphological space bears a close relationship to diet, substrate use, and foraging movements, and thus our results demonstrate the great extent of the evolutionary diversification of the Madagascan vangas.