一种在全球范围内分布的 Syndiniales 寄生虫在靠近海冰边缘的南大洋微型真核生物群落中占据主导地位。
A globally distributed Syndiniales parasite dominates the Southern Ocean micro-eukaryote community near the sea-ice edge.
机构信息
Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, Hobart, Tasmania, 7001, Australia.
Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania, 7001, Australia.
出版信息
ISME J. 2019 Mar;13(3):734-737. doi: 10.1038/s41396-018-0306-7. Epub 2018 Oct 26.
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.
Syndiniales（甲藻门，有孔虫类）是一类广泛存在于所有海洋环境中的寄生生物，但其生态作用仍知之甚少。本研究表明，在南大洋海冰边缘的 3000 公里横断面上，单一 Syndiniales 组 I 分类单元（OTU）占据了空前的主导地位。该超丰富的 OTU 始终代表着超过 20%，在某些位置甚至超过 50%的真核生物 18S rDNA 序列。在七个北半球地点分离到了相同的 18S V4 序列，并且在全球 Tara Oceans 航行的每个站点都检测到了 OTU 的假定 V9 rDNA 序列。尽管 Syndiniales 类群表现出一定的宿主特异性，但我们对南大洋宿主的鉴定表明，该 OTU 与世界不同地区不同门的宿主相关。我们的研究结果表明，Syndiniales 是世界上最具生物生产力的海洋中广阔而动态的海冰边缘附近表层水域的关键参与者。
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