A phylogeny of the high-elevation Tibetan megophryid frogs and evidence for the multiple origins of reversed sexual size dimorphism
A phylogeny of the high-elevation Tibetan megophryid frogs and evidence for the multiple origins of reversed sexual size dimorphism
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DOI：
10.1111/j.1469-7998.2007.00330.x
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发表时间：
2007-11-01
影响因子：
2
通讯作者：
Bi, K.
中科院分区：
文献类型：
--
作者：
Fu, J.;Weadick, C. J.;Bi, K.
利用线粒体和核基因序列重建了高海拔地区藏蟾科蛙类的分子系统发育。简约和贝叶斯分析产生了类似的树拓扑结构，确定属Leptobrachium作为姐妹组Vibrissaphora，属Oreolalax和Scutiger作为单系群。在后两个属，几个物种组也清楚地认识到。至少有13只巨蛤显示出性别大小二型性（RSSD），即雄性等于或大于雌性。根据我们的系统发育假说，RSSD可能已经独立进化至少五次或多达七次在这个组。在这个群体中的RSSD的多个起源提供了一个很好的机会，研究身体大小，性二型性和其他生活史特征之间的关系，并确定RSSD的成本和效益。
A molecular phylogeny of the high-elevation Tibetan megophryid frogs was reconstructed using mitochondrial and nuclear gene sequences. Both parsimony and Bayesian analysis produced similar tree topologies, which identified the genus Leptobrachium as a sister group to Vibrissaphora, and the genera Oreolalax and Scutiger as monophyletic groups. Within the latter two genera, several species groups were also clearly recognized. At least 13 megophryids display reversed sexual size dimorphism (RSSD), where males are equal to or larger than females. According to our phylogenetic hypothesis, RSSD may have independently evolved at least five times or as many as seven times in this group. The multiple origins of RSSD within this group provide an excellent opportunity for studying the relationship between body size sexual dimorphism and other life-history traits and for determining the costs and benefits of RSSD.