Interspecific relationships and the evolution of sexual dimorphism in pygmy sunfishes (Centrarchidae: Elassoma).
Interspecific relationships and the evolution of sexual dimorphism in pygmy sunfishes (Centrarchidae: Elassoma).
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侏儒翻车鱼的种间关系和性二态性的进化（Centrarchidae：Elassoma）。
DOI：
10.1016/j.ympev.2014.04.018
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发表时间：
2014
影响因子：
4.1
通讯作者：
Harris,PhillipM
中科院分区：
文献类型：
--
作者：
Sandel,Michael;Rohde,FritzC;Harris,PhillipM
埃拉索马属代表了北美东南部水生生物多样性热点地区的一个小而独特的组成部分。我们提出了所描述的七个物种的第一个系统发育，并通过线粒体和核蛋白编码基因的序列数据得到证实。这项分析揭示了沿海平原分支与地理上孤立且受联邦保护的阿拉巴马埃拉索马的姐妹。沿海平原进化枝包含广泛分布的E. zonatum，它是主要局限于新近纪低地亚省的一个分支的姐妹。我们分析了系统发育背景下的形态测量数据，以说明该属内性形状二态性的进化。对每个物种的十六个单变量和三个多变量性状进行了显着性二态性测试，并从时间树推断出相对转化率。一个简单的种间性别二态性指数显示，同域物种比较之间的差异比异域物种比较之间的差异更大。结果表明地质是影响生态多样化的主要因素，性选择是加强二次接触地区生殖隔离的机制。我们讨论了地质历史和性选择在北美东南部水生生物多样性梯度的生成和维持中的假定作用。
The genusElassomarepresents a small but unique component of the aquatic biodiversity hotspot in southeastern North America. We present the first phylogeny of the seven described species, corroborated by sequence data from mitochondrial and nuclear protein coding genes. This analysis reveals a Coastal Plain clade sister to the geographically isolated, and federally protected,Elassoma alabamae. The Coastal Plain clade contains the widespreadE. zonatum, which is sister to a clade primarily restricted to lowland Neogene subprovinces. We analyzed morphometric data in a phylogenetic context to illustrate the evolution of sexual shape dimorphism within the genus. Sixteen univariate and three multivariate traits were tested for significant sexual dimorphism for each species, and relative transformation rates were inferred from the time tree. A simple index of interspecific sexual dimorphism revealed greater disparity among sympatric species comparisons than among allopatric comparisons. Results implicate geology as a primary factor influencing ecological diversification, and sexual selection as a mechanism reinforcing reproductive isolation in areas of secondary contact. We discuss putative roles of geological history and sexual selection in the generation and maintenance of the aquatic biodiversity gradient in southeastern North America.