Correlates of rate heterogeneity in avian ecomorphological traits.

Correlates of rate heterogeneity in avian ecomorphological traits.
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DOI:
10.1111/ele.13131
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发表时间:
2018-10
期刊:
影响因子:
8.8
通讯作者:
Thomas GH
Thomas GH
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
Chira AM;Cooney CR;Bright JA;Capp EJR;Hughes EC;Moody CJA;Nouri LO;Varley ZK;Thomas GH

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性状进化的异质性是普遍存在的,但目前还不清楚是哪些过程驱动了全球辐射范围内的快速和缓慢的性状分化。在这里,我们测试多个假设解释率变化的生态形态特征(喙形)在全球分布的群体(鸟类)。我们发现低的支持,物种的进化速率的变化与生活史,环境诱变因素,范围大小,竞争对手的数量,或生活在岛屿上。事实上,在控制了物种年龄的负面影响之后,物种特异性进化速率的80%的变化仍然无法解释。在分支水平上,高进化率与不寻常的表型或高物种丰富度有关。两者合计,这些结果意味着宏观进化速率的生态形态特征的生态机会,在不同的适应区和生态位分化密切相关的物种。
Heterogeneity in rates of trait evolution is widespread, but it remains unclear which processes drive fast and slow character divergence across global radiations. Here, we test multiple hypotheses for explaining rate variation in an ecomorphological trait (beak shape) across a globally distributed group (birds). We find low support that variation in evolutionary rates of species is correlated with life history, environmental mutagenic factors, range size, number of competitors, or living on islands. Indeed, after controlling for the negative effect of species' age, 80% of variation in species‐specific evolutionary rates remains unexplained. At the clade level, high evolutionary rates are associated with unusual phenotypes or high species richness. Taken together, these results imply that macroevolutionary rates of ecomorphological traits are governed by both ecological opportunity in distinct adaptive zones and niche differentiation among closely related species.
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