Species diversity can drive speciation
Species diversity can drive speciation
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DOI：
10.1038/nature03450
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发表时间：
2005-04-21
期刊：
影响因子：
64.8
通讯作者：
Kolm, N
中科院分区：
文献类型：
--
作者：
Emerson, BC;Kolm, N
进化生态学和保护生物学的一个基本问题是：为什么某些地区比其他地区拥有更多的物种多样性？岛屿生物地理学理论已经确定了移民和灭绝的作用与面积大小和距源区的距离有关(1,2)，并且物种形成的作用也被认为是一个重要因素(3-6)。然而，一种尚未探索的可能性是，物种多样性本身可能有助于促进物种形成，事实上，岛屿生物地理学理论的中心原则支持这一预测。在这里，我们使用加那利群岛和夏威夷群岛火山群岛的植物和节肢动物的数据来解决物种多样性和多样化率之间是否存在正相关关系。我们对每个岛屿的多样化指数是特有物种的比例，并且我们测试了我们的预测，即该指数随着物种数量的增加而增加。我们表明，即使在控制了岛屿的几个重要物理特征之后，多样性仍与物种数量密切相关。
A fundamental question in evolutionary ecology and conservation biology is: why do some areas contain greater species diversity than others? Island biogeographic theory has identified the roles of immigration and extinction in relation to area size and proximity to source areas(1,2), and the role of speciation is also recognized as an important factor(3-6). However, one as yet unexplored possibility is that species diversity itself might help to promote speciation, and indeed the central tenets of island biogeographic theory support such a prediction. Here we use data for plants and arthropods of the volcanic archipelagos of the Canary and Hawaiian Islands to address whether there is a positive relationship between species diversity and rate of diversification. Our index of diversification for each island is the proportion of species that are endemic, and we test our prediction that this increases with increasing species number. We show that even after controlling for several important physical features of islands, diversification is strongly related to species number.