A globally distributed Syndiniales parasite dominates the Southern Ocean micro-eukaryote community near the sea-ice edge.,The ISME Journal

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A globally distributed Syndiniales parasite dominates the Southern Ocean micro-eukaryote community near the sea-ice edge.
The ISME Journal ( IF 10.8 ) Pub Date : 2018-10-26 , DOI: 10.1038/s41396-018-0306-7
Laurence J Clarke ₁ , Sophie Bestley _{2,

3} , Andrew Bissett _{3,

4} , Bruce E Deagle ₅

Affiliation

Syndiniales (Dinophyceae, Alveolata) are a diverse parasitic group common in all marine environments, but their ecological role remains poorly understood. Here we show an unprecedented dominance of a single Syndiniales group I operational taxonomic unit (OTU) across 3000 km of Southern Ocean transects near the sea-ice edge. This super-abundant OTU consistently represented >20%, and in some locations >50%, of eukaryote 18S rDNA sequences. Identical 18S V4 sequences have been isolated from seven Northern Hemisphere locations, and the OTU's putative V9 rDNA sequence was detected at every station of the global Tara Oceans voyage. Although Syndiniales taxa display some host specificity, our identification of candidate Southern Ocean hosts suggests this OTU associates with distinct phyla in different parts of the world. Our results indicate Syndiniales are key players in surface waters near the vast and dynamic sea-ice edge in the world's most biologically productive ocean.

中文翻译：

全球分布的Syndiniales寄生虫在海冰边缘附近的南洋微真核生物群落中占主导地位。

Syndiniales（Dinophyceae，Alveolata）是在所有海洋环境中常见的多种寄生虫，但对其生态作用的了解仍然很少。在这里，我们展示了一个单一的Syndiniales I组操作分类单位（OTU）在海冰边缘附近3000公里的南大洋样带上的空前优势。这种超丰富的OTU始终代表真核生物18S rDNA序列的> 20％，在某些位置> 50％。已从北半球的七个地点分离出相同的18S V4序列，并且在全球塔拉海洋航行的每个站点都检测到OTU的假定V9 rDNA序列。尽管Syndiniales类群显示出某些寄主特异性，但我们对候选南洋寄主的鉴定表明，该OTU与世界不同地区的不同种群有关。

更新日期：2019-01-25

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