Ecomorphological diversification following continental colonization in muroid rodents (Rodentia: Muroidea)
Ecomorphological diversification following continental colonization in muroid rodents (Rodentia: Muroidea)
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DOI：
10.1111/bij.12695
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发表时间：
2016-03-01
影响因子：
1.9
通讯作者：
Steppan, Scott J.
中科院分区：
文献类型：
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作者：
Alhajeri, Bader H.;Schenk, John J.;Steppan, Scott J.
异常多样的分支的出现通常归因于生态机会。例如，哺乳动物中最具多样性的啮齿类动物超家族的异常多样性，已经被解释为多个独立的适应辐射。如果多个生态机会事件负责产生muroid多样性，我们希望找到这些谱系的生态多样化的证据，分散到新的地理区域。在本研究中，我们测试了基于特征的预测的生态机会，身体大小，附属物和海拔的数据与先前发表的数据相结合的地理过渡和时间校准的分子生物学。我们确定了弱到没有支持早期生态多样化的所有大陆地区的初始殖民化，基于多个测试，包括节点高度测试，通过时间图的差异，进化模型比较，和贝叶斯分析macroevolutionary混合物。分支确定增加多样化率，不与地理过渡，也没有表现出模式的生态机会，这表明系统发育多样性和表型差异预测的表型分歧可能是脱钩的muroids。这些结果表明，多样化率和地理学介导的生态机会的变化是在muroids的表型多样性模式的预测差。
The emergence of exceptionally diverse clades is often attributed to ecological opportunity. For example, the exceptional diversity in the most diverse superfamily of mammals, muroid rodents, has been explained in terms of multiple independent adaptive radiations. If multiple ecological opportunity events are responsible for generating muroid diversity, we expect to find evidence of these lineages ecologically diversifying following dispersal into new biogeographical areas. In the present study, we tested the trait-based predictions of ecological opportunity using data on body size, appendages, and elevation in combination with previously published data on biogeographical transitions and a time-calibrated molecular phylogeny. We identified weak to no support of early ecological diversification following the initial colonizations of all continental regions, based on multiple tests, including node height tests, disparity through time plots, evolutionary model comparison, and Bayesian analysis of macroevolutionary mixtures. Clades identified with increased diversification rates, not associated with geographical transitions, also did not show patterns of phenotypic divergence predicted by ecological opportunity, which suggests that phylogenetic diversity and phenotypic disparity may be decoupled in muroids. These results indicate that shifts in diversification rates and biogeographically-mediated ecological opportunity are poor predictors of phenotypic diversity patterns in muroids.