Rate of evolutionary change in cranial morphology of the marsupial genus Monodelphis is constrained by the availability of additive genetic variation.

Rate of evolutionary change in cranial morphology of the marsupial genus Monodelphis is constrained by the availability of additive genetic variation.
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有袋动物属 Monodelphis 颅骨形态的进化变化率受到附加遗传变异可用性的限制。

DOI:
10.1111/jeb.12628
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发表时间:
2015
影响因子:
2.1
通讯作者:
Cheverud,JM
Cheverud,JM
中科院分区:
生物学3区
文献类型:
--
作者:
Porto,A;Sebastião,H;Pavan,SE;VandeBerg,JL;Marroig,G;Cheverud,JM

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我们测试的假设,有袋动物的颅骨进化的速度是依赖于多变量空间中的遗传变异的分布。要做到这一点,我们进行了遗传分析的颅形态变异的实验室菌株的Monodelphis domesticaand使用估计的遗传协变来分析的形态多样性的monodelphis brevicauvis物种组。我们发现,种内遗传变异集中在形态空间的少数几个轴上,这种强烈的遗传共变影响了短尾类形态多样化的速度,当发生在沿着抗性最小的遗传线上时,种间分歧发生得最快。考虑到遗传变异的几何分布,也提高了我们检测物种多样化背后的选择方案的能力,只有考虑到遗传协方差时,才能检测到几个选择的实例。因此,这项工作直接联系的遗传性状之间的协变模式的形态分歧的宏观进化模式。我们的研究结果还表明,有限的分布ofMonodelphis物种在形态空间是一个复杂的相互作用的结果之间的有限维度的可用的遗传变异和强大的稳定选择沿着两个主轴的遗传变异。
We tested the hypothesis that the rate of marsupial cranial evolution is dependent on the distribution of genetic variation in multivariate space. To do so, we carried out a genetic analysis of cranial morphological variation in laboratory strains ofMonodelphis domesticaand used estimates of genetic covariation to analyse the morphological diversification of theMonodelphis brevicaudataspecies group. We found that within‐species genetic variation is concentrated in only a few axes of the morphospace and that this strong genetic covariation influenced the rate of morphological diversification of thebrevicaudatagroup, with between‐species divergence occurring fastest when occurring along the genetic line of least resistance. Accounting for the geometric distribution of genetic variation also increased our ability to detect the selective regimen underlying species diversification, with several instances of selection only being detected when genetic covariances were taken into account. Therefore, this work directly links patterns of genetic covariation among traits to macroevolutionary patterns of morphological divergence. Our findings also suggest that the limited distribution ofMonodelphisspecies in morphospace is the result of a complex interplay between the limited dimensionality of available genetic variation and strong stabilizing selection along two major axes of genetic variation.
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