Relationships of diversity, disparity, and their evolutionary rates in squirrels (Sciuridae)
Relationships of diversity, disparity, and their evolutionary rates in squirrels (Sciuridae)
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DOI：
10.1111/evo.12642
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发表时间：
2015-05
期刊：
影响因子：
3.3
通讯作者：
M. Zelditch;Jingchun Li;Lucy A. P. Tran;D. L. Swiderski
中科院分区：
文献类型：
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作者：
M. Zelditch;Jingchun Li;Lucy A. P. Tran;D. L. Swiderski
一些理论预测，迅速多样化的分支也将迅速分化的表型;然而，也有理由怀疑，多样化和分歧可能不相关。在广泛分布的松鼠分支（松鼠科）中，我们测试了每个谱系物种形成率，物种丰富度，差异和差异的时不变度量之间的相关性，该度量允许在进化模式不同时比较比率，就像松鼠一样。我们发现，物种丰富度和物种形成率不相关的分支年龄或彼此。差异似乎是正相关的分支年龄，因为年轻的，迅速多样化的新北草原分支强烈拉到一个单一的稳定的最佳，但老，缓慢多样化的古热带森林分支包含谱系，分歧沿着多个生态和形态线。这种对比可能是由于它们所居住的环境和它们的系统发育群落结构。我们的研究结果反对赞成地理介导的物种形成模式和生态介导的表型进化模式的多样性和差异的共同解释。
Several theories predict that rapidly diversifying clades will also rapidly diverge phenotypically; yet, there are also reasons for suspecting that diversification and divergence might not be correlated. In the widely distributed squirrel clade (Sciuridae), we test for correlations between per lineage speciation rates, species richness, disparity, and a time‐invariant measure of disparity that allows for comparing rates when evolutionary modes differ, as they do in squirrels. We find that species richness and speciation rates are not correlated with clade age or with each other. Disparity appears to be positively correlated with clade age because young, rapidly diversifying Nearctic grassland clades are strongly pulled to a single stable optimum but older, slowly diversifying Paleotropical forest clades contain lineages that diverge along multiple ecological and morphological lines. That contrast is likely due to both the environments they inhabit and their phylogenetic community structure. Our results argue against a shared explanation for diversity and disparity in favor of geographically mediated modes of speciation and ecologically mediated modes of phenotypic evolution.