古细菌
微生物
海洋学
有机质
塔玛丘塔
冰架
环境科学
海冰
大陆架
微生物种群生物学
总有机碳
溶解有机碳
深海
生态学
环境化学
生物
细菌
地质学
化学
冰层
古生物学
作者
Clara Martínez-Pérez,Chris Greening,Sean K. Bay,Rachael Lappan,Zihao Zhao,Daniele De Corte,Christina L. Hulbe,Christian Ohneiser,Craig L. Stevens,Blair Thomson,Ramunas Stepanauskas,José M. González,Ramiro Logares,Gerhard J. Herndl,Sergio E. Morales,Federico Baltar
标识
DOI:10.1038/s41467-021-27769-5
摘要
Abstract Throughout coastal Antarctica, ice shelves separate oceanic waters from sunlight by hundreds of meters of ice. Historical studies have detected activity of nitrifying microorganisms in oceanic cavities below permanent ice shelves. However, little is known about the microbial composition and pathways that mediate these activities. In this study, we profiled the microbial communities beneath the Ross Ice Shelf using a multi-omics approach. Overall, beneath-shelf microorganisms are of comparable abundance and diversity, though distinct composition, relative to those in the open meso- and bathypelagic ocean. Production of new organic carbon is likely driven by aerobic lithoautotrophic archaea and bacteria that can use ammonium, nitrite, and sulfur compounds as electron donors. Also enriched were aerobic organoheterotrophic bacteria capable of degrading complex organic carbon substrates, likely derived from in situ fixed carbon and potentially refractory organic matter laterally advected by the below-shelf waters. Altogether, these findings uncover a taxonomically distinct microbial community potentially adapted to a highly oligotrophic marine environment and suggest that ocean cavity waters are primarily chemosynthetically-driven systems.
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