Evidence for isolated evolution of deep-sea ciliate communities through geological separation and environmental selection.
Evidence for isolated evolution of deep-sea ciliate communities through geological separation and environmental selection.
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DOI：
10.1186/1471-2180-13-150
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发表时间：
2013-07-08
期刊：
影响因子：
4.2
通讯作者：
Stoeck T
中科院分区：
文献类型：
--
作者：
Stock A;Edgcomb V;Orsi W;Filker S;Breiner HW;Yakimov MM;Stoeck T
深高盐缺氧盆地（DHAB）是位于地中海东部海底的孤立生境，起源于古老的墨西拿海碳酸盐溶解。不同的盆地从同一来源招募其原始生物群，但它们的地质演化最终构成了尖锐的环境障碍，限制了单个盆地之间的遗传交流。因此，DHAB是评估地质事件和环境条件对原生生物浮游生物进化和多样性影响的独特模式系统。在这里，我们研究的单细胞真核生物原生浮游生物群落的地理分离和环境选择驱动的孤立进化的证据。我们专门专注于纤毛虫原生生物作为一个主要组成部分的原生生物DHAB浮游生物的小亚基核糖体RNA的高变V4片段的焦磷酸测序。海洋纤毛虫的地理空间分布和响应差异水化学表明强大的物理和化学障碍扩散，影响这一浮游生物群的演变。在四个调查DHAB的盐水中的纤毛虫群落是显着不同的界面（盐跃层）紧接在盐水之上的纤毛虫群落。虽然界面纤毛虫群落从不同的网站是相对相似的，彼此之间的盐水纤毛虫群落显着不同的网站。我们没有发现距离衰减的关系，和典型的对应分析确定氧和钠作为最重要的水化学参数解释界面和盐水纤毛虫群落之间的多样性分区。然而，没有分析的水化学参数解释了显着差异，在不同的盆地之间的盐水纤毛虫群落。我们的数据表明，在盐水之上的深海水中有频繁的基因交换。不同卤水的“孤岛特征”，导致地质事件和当代环境条件，创造选择性的压力驱动进化过程，并随着时间的推移，导致物种形成和形状原生生物群落组成。我们的结论是，在DHAB的社区大会是一个混合物的孤立的进化（证明了一些类群的V4初级结构的小变化）和物种分类（如区域的个别分类群的存在/不存在的高层次的分类层次）。
Deep hypersaline anoxic basins (DHABs) are isolated habitats at the bottom of the eastern Mediterranean Sea, which originate from the ancient dissolution of Messinian evaporites. The different basins have recruited their original biota from the same source, but their geological evolution eventually constituted sharp environmental barriers, restricting genetic exchange between the individual basins. Therefore, DHABs are unique model systems to assess the effect of geological events and environmental conditions on the evolution and diversification of protistan plankton. Here, we examine evidence for isolated evolution of unicellular eukaryote protistan plankton communities driven by geological separation and environmental selection. We specifically focused on ciliated protists as a major component of protistan DHAB plankton by pyrosequencing the hypervariable V4 fragment of the small subunit ribosomal RNA. Geospatial distributions and responses of marine ciliates to differential hydrochemistries suggest strong physical and chemical barriers to dispersal that influence the evolution of this plankton group. Ciliate communities in the brines of four investigated DHABs are distinctively different from ciliate communities in the interfaces (haloclines) immediately above the brines. While the interface ciliate communities from different sites are relatively similar to each other, the brine ciliate communities are significantly different between sites. We found no distance-decay relationship, and canonical correspondence analyses identified oxygen and sodium as most important hydrochemical parameters explaining the partitioning of diversity between interface and brine ciliate communities. However, none of the analyzed hydrochemical parameters explained the significant differences between brine ciliate communities in different basins. Our data indicate a frequent genetic exchange in the deep-sea water above the brines. The “isolated island character” of the different brines, that resulted from geological events and contemporary environmental conditions, create selective pressures driving evolutionary processes, and with time, lead to speciation and shape protistan community composition. We conclude that community assembly in DHABs is a mixture of isolated evolution (as evidenced by small changes in V4 primary structure in some taxa) and species sorting (as indicated by the regional absence/presence of individual taxon groups on high levels in taxonomic hierarchy).
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影响因子：
3.4
作者：
Epstein, Slava;Lopez-Garcia, Purificacion
通讯作者：
Lopez-Garcia, Purificacion
影响因子：
64.8
作者：
Boxma, B;de Graaf, RM;Hackstein, JHP
通讯作者：
Hackstein, JHP
影响因子：
2.2
作者：
Dunthorn, Micah;Klier, Julia;Stoeck, Thorsten
通讯作者：
Stoeck, Thorsten
影响因子：
3.4
作者：
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通讯作者：
Finlay, BJ
DOI：
10.1016/j.dsr.2011.07.003
发表时间：
2011-10-01
影响因子：
2.4
作者：
Edgcomb, V. P.;Orsi, W.;Stoeck, T.
通讯作者：
Stoeck, T.