Biogeographic evolution of Madagascar's microendemic biota
Biogeographic evolution of Madagascar's microendemic biota
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DOI：
10.1126/science.1122806
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发表时间：
2006-05-19
期刊：
影响因子：
56.9
通讯作者：
Ganzhorn, JU
中科院分区：
文献类型：
--
作者：
Wilmé, L;Goodman, SM;Ganzhorn, JU
马达加斯加的特有物种丰富度，相对于陆地面积，是世界上无与伦比的。岛上的许多生物都有有限的地理范围。一个全面的假说解释这种微特有的演变还有待发展。使用流域的第四纪气候变化的背景下进行分析，我们提供了一个新的机制模型来解释岛上的爆炸性物种形成的过程。河流流域的来源在相对低海拔地区的隔离，从而导致当地特有的类群的物种形成，而那些在较高海拔地区的撤退和分散，因此包含比例较低水平的微特有。这些结果提供了一个框架，地理学和地理学的研究，以及优先考虑在岛上的剩余的天然森林栖息地的保护行动的基础。
The endemic species richness on Madagascar, relative to landmass area, is unparalleled in the world. Many organisms on the island have restricted geographical ranges. A comprehensive hypothesis explaining the evolution of this microendemism has yet to be developed. Using an analysis of watersheds in the context of Quaternary climatic shifts, we provide a new mechanistic model to explain the process of explosive speciation on the island. River catchments with sources at relatively low elevations were zones of isolation and hence led to the speciation of locally endemic taxa, whereas those at higher elevations were zones of retreat and dispersion and hence contain proportionately lower levels of microendemism. These results provide a framework for biogeographic and phylogeographic studies, as well as a basis for prioritizing conservation actions of the remaining natural forest habitats on the island.