Molecular phylogeny and historical biogeography of Nacella (Patellogastropoda: Nacellidae) in the Southern Ocean
Molecular phylogeny and historical biogeography of Nacella (Patellogastropoda: Nacellidae) in the Southern Ocean
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DOI：
10.1016/j.ympev.2010.02.001
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发表时间：
2010-07-01
影响因子：
4.1
通讯作者：
Poulin, Elie
中科院分区：
文献类型：
--
作者：
Gonzalez-Wevar, Claudio A.;Nakano, Tomoyuki;Poulin, Elie
南大洋海洋底栖动物群的演变和历史地理与过去5 500万年（Ma）期间该区域发生的主要构造和气候变化密切相关。一些科，属，甚至物种的海洋生物之间共享遥远的地理省份在这一地区。海洋底栖无脊椎动物的这种分布模式通常被解释为板块构造造成的替代物种形成。然而，最近的分子研究提供了新的证据，证明长距离扩散是南大洋生物地理模式的合理解释。真正的帽贝目前分布在南大洋的不同地理区域，如南极洲、凯尔盖朗省、新西兰南部、智利中北部和南美洲麦哲伦省。在这里，我们提出了系统发育重建使用两个线粒体DNA标记（细胞色素氧化酶I和细胞色素B），以了解Nocella物种之间的关系，并确定属的起源和多样化。系统发育重建使用两种方法，最大简约和贝叶斯推理，而Nacella物种之间的分歧时间估计后，一个宽松的贝叶斯方法。为此，我们收集了属于四个海洋地理区域在南大洋：南极洲，Kerguelen省，智利中部，麦哲伦Provincials.Our分子的结果与以前的形态和分子研究支持的单系Nacella和它的姐妹关系Cellana的潮间和潮下带种。Nacella的发展经历了两轮多元化。第一次发生在中新世末，并产生了主要的谱系，目前分布在南极洲，南美洲或凯尔盖朗省。大的遗传分化Nacella物种从这些遥远的地理省份强调跨洋不连续性的意义，并建议长距离传播是相对不重要的。第二轮多样化包括麦哲伦区域更新世辐射。在这个省，不同形态的Nacella物种表现出极低的遗传分化水平，它们之间没有相互的单系性。根据我们的时间估计，Nacella在南大洋的起源和多样化是最近的（
The evolution and the historical biogeography of the Southern Ocean marine benthic fauna are closely related to major tectonic and climatic changes that occurred in this region during the last 55 million years (Ma). Several families, genera and even species of marine organisms are shared between distant biogeographic provinces in this region. This pattern of distribution in marine benthic invertebrates has been commonly explained by vicariant speciation due to plate tectonics. However, recent molecular studies have provided new evidence for long-distance dispersion as a plausible explanation of biogeographical patterns in the Southern Ocean. True limpets of the genus Nacella are currently distributed in different biogeographic regions of the Southern Ocean such as Antarctica, Kerguelen Province, southern New Zealand Antipodean Province, North-Central Chile and South American Magellanic Province. Here, we present phylogenetic reconstructions using two mitochondrial DNA markers (Cytochrome Oxidase I and Cytochrome b) to look into the relationships among Nocella species and to determine the origin and diversification of the genus. Phylogenies were reconstructed using two methods, Maximum Parsimony and Bayesian Inference, while divergence time among Nacella species was estimated following a relaxed Bayesian approach. For this purpose, we collected inter- and subtidal species belonging to four biogeographic regions in the Southern Ocean: Antarctica, Kerguelen Province, Central Chile, and Magellanic Province.Our molecular results agree with previous morphological and molecular studies supporting the monophyly of Nacella and its sister relationship with Cellana. Two rounds of diversification are recognized in the evolution of Nacella. The first one occurred at the end of the Miocene and gave rise to the main lineages, currently distributed in Antarctica, South America or Kerguelen Province. Large genetic divergence was detected among Nacella species from these distant biogeographic provinces emphasizing the significance of trans-oceanic discontinuities and suggesting long-distance dispersal was relatively unimportant. The second diversification round consisted of a more recent Pleistocene radiation in the Magellanic region. In this province, different morphological species of Nacella exhibit extreme low levels of genetic divergence with absence of reciprocal monophyly among them.According to our time estimation, the origin and diversification of Nacella in the Southern Ocean is more recent (