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Marine species formation along the rise of Central America: The anomuran crab Megalobrachium.
Molecular Ecology ( IF 4.5 ) Pub Date : 2019-12-02 , DOI: 10.1111/mec.15323
Alexandra Hiller 1 , Harilaos A Lessios 1
Affiliation  

The evolution of marine neotropical shallow water species is expected to have been greatly affected by physical events related to the emergence of the Central American Isthmus. The anomuran crab Megalobrachium, a strictly neotropical porcellanid genus, consists of four species in the West Atlantic (WA) and nine in the East Pacific (EP). Dispersal is limited to a relatively short planktonic phase, which lasts approximately two weeks. We obtained DNA sequences of three mitochondrial and two nuclear genes of all but one species of Megalobrachium to construct a time-calibrated phylogeny of the genus and its historical phylogeography, based on the reconstruction of ancestral areas. The topology of the phylogenetic trees of Megalobrachium produced by Bayesian Inference (BI) and Maximum Likelihood (ML) were virtually congruent. The genus is monophyletic with respect to other porcellanids. Ancestral area reconstruction indicates that it arose in the eastern Pacific 18 million years ago and diversified into at least 13 species that are currently formally recognized and three additional species indicated by our data. Most morphological variation appears to have followed phylogenetic differentiation, though some cryptic speciation has also occurred. Four geminate clades in this genus implicate the gradual emergence of the Central American Isthmus in this diversification, but events preceding the final separation of the oceans as well as within-ocean events after the cessation of water connections were also important.

中文翻译:

沿中美洲兴起的海洋物种形成:anomuran蟹Megalobrachium。

预计海洋新热带浅水物种的演变将受到与中美洲地峡出现有关的物理事件的极大影响。严格意义上的新潮性porcellanid属的无头蟹Megalobrachium,由西大西洋(WA)的四种和东太平洋(EP)的九种组成。分散仅限于相对较短的浮游阶段,持续约两周。我们获得了三个物种的线粒体和两个核基因的DNA序列,除了一个物种的支气管轮虫,以祖先区域的重建为基础,构建了该属的时间校准的系统发育及其历史系统地理学。贝叶斯推断(BI)和最大似然(ML)产生的巨型支气管球菌的系统树的拓扑实际上是一致的。该属相对于其他porcellanids是单系的。祖先地区重建表明它起源于1800万年前的东太平洋,并已多样化为至少13种目前已被正式承认的物种,以及我们数据显示的另外3个物种。尽管也发生了一些隐性物种形成,但大多数形态变异似乎都遵循了系统发育分化。该属中的四个双枝进化枝表明中美洲地峡在这种多样化中的逐渐出现,但最后分离海洋之前的事件以及停止水系连接后的海洋内部事件也很重要。祖先地区重建表明它起源于1800万年前的东太平洋,并已多样化为至少13种目前已被正式承认的物种,以及我们数据显示的另外3个物种。尽管也发生了一些隐性物种形成,但大多数形态变异似乎都遵循了系统发育分化。该属中的四个双枝进化枝表明中美洲地峡在这种多样化中的逐渐出现,但最后分离海洋之前的事件以及停止水系连接后的海洋内部事件也很重要。祖先地区重建表明它起源于1800万年前的东太平洋,并已多样化为至少13种目前已被正式承认的物种,以及我们数据显示的另外3个物种。尽管也发生了一些隐性物种形成,但大多数形态变异似乎都遵循了系统发育分化。该属中的四个双枝进化枝表明中美洲地峡在这种多样化中的逐渐出现,但最后分离海洋之前的事件以及停止水系连接后的海洋内部事件也很重要。尽管也发生了一些神秘的物种形成。该属中的四个双枝进化枝暗示中美洲地峡在这种多样化中的逐渐出现,但最后分离海洋之前的事件以及停止水系连接后的海洋内部事件也很重要。尽管也发生了一些神秘的物种形成。该属中的四个双枝进化枝表明中美洲地峡在这种多样化中的逐渐出现,但最后分离海洋之前的事件以及停止水系连接后的海洋内部事件也很重要。
更新日期:2019-12-25
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