Genetic and environmental contributions to variation in baboon cranial morphology.
Genetic and environmental contributions to variation in baboon cranial morphology.
复制标题
遗传和环境对狒狒颅骨形态变化的贡献。
DOI：
10.1002/ajpa.21341
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发表时间：
2010
影响因子：
2.8
通讯作者：
Cheverud,JamesM
中科院分区：
文献类型：
--
作者：
Roseman,CharlesC;Willmore,KatherineE;Rogers,Jeffrey;Hildebolt,Charles;Sadler,BrookeE;Richtsmeier,JoanT;Cheverud,JamesM
形态特征的发展、功能和整合都被假设为通过影响形态特征进化的方式来影响性状在系统发育重建中的效用。我们使用狒狒模型来检验有关颅骨特征的表型和数量遗传变异的假设，这些变异与表型的进化倾向有关。我们测试以下假设：1）颅骨不同功能和发育定义区域的个体特征在环境、遗传和表型方面存在差异； 2）与其他性状的遗传协方差对颅骨某一区域的性状的限制大于其他区域的性状； 3) 受到不同程度机械应变的颅骨区域在个体性状的变化幅度上有所不同。我们发现个体性状的环境和遗传变异水平是随机分布在颅骨的各个区域，而不是由发育起源或暴露于压力的程度来构建。与其他区域的个体特征相比，颅顶中的个体特征往往更容易受到与其他特征的协方差的限制。咀嚼过程中受到高度压力的区域的性状在任何水平上都不会比其他性状有更多的变化。如果这些结果可以推广到其他人群，则表明没有理由假设来自颅骨任何部分的个体特征本质上比来自任何其他部分的个体特征对于重建进化模式的作用更小。 Am J Phys Anthropol 143:1–12, 2010。© 2010 Wiley-Liss, Inc.
The development, function, and integration of morphological characteristics are all hypothesized to influence the utility of traits for phylogenetic reconstruction by affecting the way in which morphological characteristics evolve. We use a baboon model to test the hypotheses about phenotypic and quantitative genetic variation of traits in the cranium that bear on a phenotype's propensity to evolve. We test the hypotheses that: 1) individual traits in different functionally and developmentally defined regions of the cranium are differentially environmentally, genetically, and phenotypically variable; 2) genetic covariance with other traits constrains traits in one region of the cranium more than those in others; 3) and regions of the cranium subject to different levels of mechanical strain differ in the magnitude of variation in individual traits. We find that the levels of environmental and genetic variation in individual traits are randomly distributed across regions of the cranium rather than being structured by developmental origin or degree of exposure to strain. Individual traits in the cranial vault tend to be more constrained by covariance with other traits than those in other regions. Traits in regions subject to high degrees of strain during mastication are not any more variable at any level than other traits. If these results are generalizable to other populations, they indicate that there is no reason to suppose that individual traits from any one part of the cranium are intrinsically less useful for reconstructing patterns of evolution than those from any other part. Am J Phys Anthropol 143:1–12, 2010. © 2010 Wiley‐Liss, Inc.