Cryptic speciation at organic-rich marine habitats: a new bacteriovore annelid from whale-fall and fish farms in the North-East Atlantic
Cryptic speciation at organic-rich marine habitats: a new bacteriovore annelid from whale-fall and fish farms in the North-East Atlantic
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DOI：
10.1111/j.1096-3642.2008.00469.x
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发表时间：
2009-04-01
影响因子：
2.8
通讯作者：
Dahlgren, Thomas G.
中科院分区：
文献类型：
--
作者：
Wiklund, Helena;Glover, Adrian G.;Dahlgren, Thomas G.
阿德维氏维氏杆菌11月，在瑞典的一次鲸鱼坠落和挪威渔场下采集的沉积物样本中描述了一种新的黄足目环节动物。虽然来自四个基因的分子证据表明它们是不同的物种，但新的Vigtorniella物种在形态上与太平洋鲸鱼瀑布中的Vigtorniella flkati几乎完全相同。弧菌种群遗传结构及系统发育关系研究。11月利用核基因18S和28S以及线粒体16S和细胞色素C氧化酶亚基I(COI)的分子数据进行了评估。据报道，在北大西洋不同的富含有机物质的环境(养鱼场和鲸鱼下落)之间，存在高水平的基因流动。对摄食生物学和栖息地的观察表明，阿氏弧菌专门捕食细菌垫，而不是鲸鱼坠落，尽管有数据的两种维格托尼亚氏菌表现出非常不同的摄食行为。我们的结果进一步显示维氏杆菌对线粒体标记的分歧率出人意料地低，这表明选择是稳定的。根据简约分析、极大似然法和贝斯先生的分析，都将维格托尼氏菌归类为Dyspenus的姊妹群，这表明它们在进化上与沉积物动物有密切的联系。(C)《伦敦林尼安学会》，《林尼安学会动物学刊》，2009年，155,774-785。
Vigtorniella ardabilia sp. nov., a new chrysopetalid annelid, is described from a whale-fall in Sweden and from sediment samples collected beneath fish farms in Norway. The new Vigtorniella species is morphologically almost identical to Vigtorniella flokati from whale-falls in the Pacific Ocean, although molecular evidence from four genes shows that they are different species. Population genetic structure and phylogenetic relationships of V. ardabilia sp. nov. were assessed using molecular data from the nuclear genes 18S and 28S, and the mitochondrial 16S and cytochrome c oxidase subunit I (COI). High levels of gene flow are reported between contrasting organic-rich environments in the North Atlantic (fish farms and whale-fall). Observations of feeding biology and habitat suggest that V. ardabilia specializes on bacterial mats, rather than on whale-falls, although the two species of Vigtorniella for which data were available show very different feeding behaviours. Our results further showed an unexpectedly low divergence rate in Vigtorniella for the mitochondrial markers, suggesting stabilizing selection. Analyses carried out with parsimony, maximum likelihood, and MrBayes all placed the genus Vigtorniella as sister group to Dysponetus, suggesting a close evolutionary link to sediment-dwelling fauna. (C) 2009 The Linnean Society of London, Zoological Journal of the Linnean Society, 2009, 155, 774-785.