Diversification rates and phenotypic evolution in venomous snakes (Elapidae).
Diversification rates and phenotypic evolution in venomous snakes (Elapidae).
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DOI：
10.1098/rsos.150277
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发表时间：
2016-01
影响因子：
3.5
通讯作者：
Palci A
中科院分区：
文献类型：
--
作者：
Lee MS;Sanders KL;King B;Palci A
在眼镜蛇科，最大的辐射高度毒蛇的多样化和身体大小的变化（表型进化的共同代理）之间的关系进行了调查。利用7个线粒体和核基因构建了175种眼镜蛇（占已知类群的50%以上）的时间校准系统发育树。使用这些树木进行的分析显示，没有证据表明物种形成率与体型变化之间存在联系。两个分支（Hydrophis，Micrurus）在Elapidae内表现出非常高的多样化率，但表现出身体大小的进化率几乎相同的一般眼镜蛇的“背景”率。虽然物种形成率和身体大小的变化率之间的相关性存在于某些群体（如射线鳍鱼，雀形目鸟类），这两个过程似乎是解耦的眼镜蛇。与澳大拉西亚殖民化相关的多样化动态也没有明显的变化，这是令人惊讶的，因为眼镜蛇似乎是到达该大陆的第一个毒蛇分支。
The relationship between rates of diversification and of body size change (a common proxy for phenotypic evolution) was investigated across Elapidae, the largest radiation of highly venomous snakes. Time-calibrated phylogenetic trees for 175 species of elapids (more than 50% of known taxa) were constructed using seven mitochondrial and nuclear genes. Analyses using these trees revealed no evidence for a link between speciation rates and changes in body size. Two clades (Hydrophis, Micrurus) show anomalously high rates of diversification within Elapidae, yet exhibit rates of body size evolution almost identical to the general elapid ‘background’ rate. Although correlations between speciation rates and rates of body size change exist in certain groups (e.g. ray-finned fishes, passerine birds), the two processes appear to be uncoupled in elapid snakes. There is also no detectable shift in diversification dynamics associated with the colonization of Australasia, which is surprising given that elapids appear to be the first clade of venomous snakes to reach the continent.