Vertical community patterns of Labyrinthulomycetes protists reveal their potential importance in the oceanic biological pump
Vertical community patterns of Labyrinthulomycetes protists reveal their potential importance in the oceanic biological pump
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DOI：
10.1111/1462-2920.15709
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发表时间：
2021-08-16
影响因子：
5.1
通讯作者：
Wang, Guangyi
中科院分区：
文献类型：
--
作者：
Bai, Mohan;Xie, Ningdong;Wang, Guangyi
生物泵在将有机颗粒输出到深海进行长期碳封存方面起着至关重要的作用。然而，其中一些关键的微生物角色仍不为人所知。本研究以迷路菌原生生物（labyrinth omycetes protists， LP）为研究对象，探讨了异养微真核生物在微粒性有机物从表层向暗海洋运输中的作用。与原核生物生物量垂直方向的急剧下降不同，浅层生物量随深度的增加而略有下降，最终超过了深海层的原核生物生物量。测序发现LP群落具有高度多样性，在所有深度均以单胞藻为优势。值得注意的是，在表层观测到的asv约占20%，而在每个深层（包括深海）层中观测到的asv约占60%，这表明LP种群可能垂直出口到深海。进一步分析了50个最丰富的asv的垂直格局，揭示了中上层海洋LP种型的生态位划分，包括那些可以分解有机碎屑和/或促进快速下沉颗粒形成的物种。总的来说，本研究提出了几条证据，表明LP可以通过其多种生态类型在远洋中成为生物泵的重要组成部分。
The biological pump plays a vital role in exporting organic particles into the deep ocean for long-term carbon sequestration. However, much remains unknown about some of its key microbial players. In this study, Labyrinthulomycetes protists (LP) were used to understand the significance of heterotrophic microeukaryotes in the transport of particulate organic matter from the surface to the dark ocean. Unlike the sharp vertical decrease of prokaryotic biomass, the LP biomass only slightly decreased with depth and eventually exceeded prokaryotic biomass in the bathypelagic layer. Sequencing identified high diversity of the LP communities with a dominance of Aplanochytrium at all depths. Notably, ASVs that were observed in the surface layer comprised similar to 20% of ASVs and similar to 60% of sequences in each of the deeper (including bathypelagic) layers, suggesting potential vertical export of the LP populations to the deep ocean. Further analyses of the vertical patterns of the 50 most abundant ASVs revealed niche partitioning of LP phylotypes in the pelagic ocean, including those that could decompose organic detritus and/or facilitate the formation of fast-sinking particles. Overall, this study presents several lines of evidence that the LP can be an important component of the biological pump through their multiple ecotypes in the pelagic ocean.