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The evolutionary history of two species of Orthocladiinae (Diptera: Chironomidae) from Lake Baikal (Eastern Siberia)

机译:贝加尔湖(东西伯利亚)的两种直翅类(双翅目:Chironomidae)的进化史

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摘要

The evolutionary history of two species belonging to the genus Orthocladius van der Wulp, 1874 (Diptera: Chironomidae) from Lake Baikal was investigated using the mitochondrial gene coding the first subunit of the cytochrome c oxidase (CO1 mtDNA). The phylogenetic analysis indicated that the Baikal Orthocladius species were divided into two well-defined clades where O. (Orthocladius) gregarius Linevitsh, 1970 was a sister species to Palaearctic O. (Orthocladius) nitidoscutellatus Lundstrom, 1915 and the O. (Eudactylocladius) sp. was a sister species to Nearctic O. (Eudactylocladius) subletteorum Cranston, 1998. Divergence time estimates indicated that these species had been evolving independently for about 18 Ma (Neogene, Early Miocene), while emergence of the most recent common ancestors of the modern O. (Orthocladius) gregarius and O. (Eudactylocladius) sp. was dated to about 3.5 Ma (Neogene, Pliocene). The evolution of Baikal orthoclads occurred from the rheophilic fauna under conditions of global climate change during the geological history of the Baikal Depression in the Tertiary Period.
机译:使用编码细胞色素C氧化酶第一个亚基(CO1 mtDNA)的线粒体基因,研究了贝加尔湖(Orthocladius van der Wulp)属两个物种(1874年)(双翅目:Chironomidae)的进化史。系统发育分析表明,贝加尔湖的Orthocladius物种被分为两个明确的进化枝,其中O.(Orthocladius)gregarius Linevitsh,1970是Palaearctic O.(Orthocladius)nitidoscutellatus Lundstrom,1915和O.(Eudactylocladius)sp。的姊妹物种。 。是近邻O.(Eudactylocladius)亚属Cranston的姊妹物种,1998年。发散时间估计表明,这些物种在大约18 Ma(新近纪,中新世)中独立进化,而现代O的最近共同祖先则出现了。 (Orthocladius)gregarius和O.(Eudactylocladius)sp。大约是3.5 Ma(新近纪,新世)。在第三纪贝加尔湖De陷的地质史中,全球气候变化条件下,嗜水动物群是贝加尔湖原附子的进化所致。

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