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首页> 外文期刊>Ecology letters >Evolutionary constraints on regional faunas: whom, but not how many
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Evolutionary constraints on regional faunas: whom, but not how many

机译：区域动物的进化限制：谁，但不是多少

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摘要

The latitudinal diversity gradient has been hypothesized to reflect past evolutionary dynamics driven by climatic niche conservation during cladogenesis, i.e. the tropical conservatism hypothesis. Here we show that the species diversity of treefrogs (Hylidae) across the western hemisphere is actually independent of evolutionary niche dynamics. We evaluated three key predictions of the tropical conservatism hypothesis that relate to the relationships between climate, species richness and the phylogenetic structure of regional treefrog faunas across the continental Americas. Species composition was dependent on the inability of some lineages to evolve cold tolerance, but the actual number of species in a region was strongly predicted by precipitation, not temperature. Moreover, phylogenetic structure was independent of precipitation. Thus, species in low-richness areas were no more closely related than species in highly diverse regions. These results provide no support for the tropical conservatism hypothesis. Instead, they show that regional species composition and richness are constrained by different climatic components, demonstrating that global biodiversity gradients can be independent of niche stasis during cladogenesis.
机译：假设纬度多样性梯度反映了成岩过程中由生态位守恒驱动的过去进化动力学，即热带保守主义假说。在这里，我们显示了西半球树蛙（Hylidae）的物种多样性实际上与进化生态位动力学无关。我们评估了热带保守主义假设的三个关键预测，这些预测与气候，物种丰富度以及整个美洲大陆区域树蛙动物群的系统发育结构之间的关系有关。物种组成取决于某些谱系不能进化出耐寒性，但是该区域中物种的实际数量是由降水而非温度强烈预测的。此外，系统发育结构与降水无关。因此，低丰度地区的物种没有比高度多样化地区的物种更紧密相关。这些结果不支持热带保守主义假设。相反，他们表明，区域物种的组成和丰富度受到不同气候成分的限制，表明全球生物多样性梯度可以独立于成枝过程中的生态位。

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