Intraspecific variation in Anolis sagrei mirrors the adaptive radiation of Greater Antillean anoles
Intraspecific variation in Anolis sagrei mirrors the adaptive radiation of Greater Antillean anoles
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DOI：
10.1111/j.1095-8312.2007.00700.x
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发表时间：
2007-02-01
影响因子：
1.9
通讯作者：
Bardeleben, Carolyne
中科院分区：
文献类型：
--
作者：
Calsbeek, Ryan;Smith, Thomas B.;Bardeleben, Carolyne
大安的列斯群岛的阿诺利斯蜥蜴是脊椎动物适应性辐射的经典例子之一。相同的形态类型（“生态形态”）在不同岛屿上重复进化，以应对类似的生态压力。我们测试了物种内的多样化模式是否是一致的物种之间的模式和过程，导致适应性辐射的大安的列斯群岛变色龙通过测量的变化，在棕色变色龙，Anolis sagrei的性能相关的形态特征。我们测量了巴哈马群岛五个岛屿上两种不同生境类型的形态和遗传变异。我们估计人口结构和基因流率内和岛屿之间使用8个微卫星标记。在性能相关的形态特征的种内变化是类似的模式，种间变化的特点，适应性辐射这一组在大安的列斯群岛。例如，在A. Sagrei，这在变色龙物种中也已显示。尽管岛屿内部和岛屿之间的基因流动水平相对较高，但仍发生了性状的形态分歧。这些结果进行了讨论的背景下的分歧与基因流模型的物种形成。研究结果提供了重要的种内证据表明，变色龙的多样化是由自然选择形成的，并显示了基于生态的选择压力如何解释种群和物种水平的多样化。(c)2007年，伦敦林奈学会。
Anolis lizards of the Greater Antilles represent one of the classic examples of vertebrate adaptive radiation. The same morphological types ('ecomorphs') have evolved repeatedly in response to similar ecological pressures on different islands. We tested whether patterns of within species diversification were congruent with between species patterns and the processes leading to the adaptive radiation of Greater Antillean anoles by measuring variation in performance-related morphological characters in the brown anole, Anolis sagrei. We measured morphological and genetic variation in two different habitat types on each of five islands in the Bahamas. We estimated population structure and rates of gene flow within and among islands using eight microsatellite markers. Intraspecific variation in performance-related morphological characters was similar to the pattern of interspecific variation that characterizes the adaptive radiation of this group in the Greater Antilles. For example, limb length was correlated with perch diameter within A. sagrei as has also been shown among species of anole. Morphological divergence in traits has occurred despite relatively high levels of gene flow both within and among islands. These results are discussed in the context of the divergence-with-gene-flow model of speciation. The results provide important intraspecific evidence that the diversification of anoles has been shaped by natural selection and show how ecologically-based selection pressures explain diversification at both the population and species levels. (c) 2007 The Linnean Society of London.