Independent adaptation to riverine habitats allowed survival of ancient cetacean lineages
Independent adaptation to riverine habitats allowed survival of ancient cetacean lineages
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DOI：
10.1073/pnas.97.21.11343
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发表时间：
2000-10-10
影响因子：
11.1
通讯作者：
Milinkovitch, MC
中科院分区：
文献类型：
--
作者：
Cassens, I;Vicario, S;Milinkovitch, MC
这四种河豚与三个次大陆上的六个不同的大水系联系在一起，根据它们相似的外表，一个多世纪以来一直被归类为一个单一的分类群。然而，几位形态学者最近对这一群体的单一性提出了质疑。通过对三个线粒体和两个核基因的核苷酸序列的系统发育分析，我们以统计学意义证明了现存的河豚不是单系进化的，并表明它们是残存物种，它们对河流生境的适应偶然地确保了它们的生存，使其免受海洋生态系统的重大环境变化或Delphinidae的出现。
The four species of "river dolphins" are associated with six separate great river systems on three subcontinents and have been grouped for more than a century into a single taxon based on their similar appearance. However, several morphologists recently questioned the monophyly of that group. By using phylogenetic analyses of nucleotide sequences from three mitochondrial and two nuclear genes, we demonstrate with statistical significance that extant river dolphins are not monophyletic and suggest that they are relict species whose adaptation to riverine habitats incidentally insured their survival against major environmental changes in the marine ecosystem or the emergence of Delphinidae.