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Transitions in microbial communities along two sediment cores collected from the landward walls of the New Britain trench

机译：沿着来自新英国沟渠的陆地墙壁收集的两个沉积物核心的微生物社区过渡

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摘要

The landward wall of the New Britain Trench (NBT) is an active continental margin. Unlike passive margins, it lacks a continental rise and the abyssal plain, and has a steep continental slope ending in an oceanic trench. Although the trench systems are receiving more and more attentions, our understanding of the microbiology of the NBT and its trench walls is limited. In this study, we collected a 70 cm gravity core (4524 m depth) and a 30 cm box core (4130 m depth) from the western and eastern landward walls of the NBT, respectively. Diversity and composition of microbial communities were investigated at high resolution in 2 cm depth intervals. In two cores, obvious vertical transitions from the aerobic to anaerobic but distinct dominant anaerobic microbes were observed. In the eastern trench wall, anaerobic fermenters, such as Anaerolineales and Alphaproteobacteria, were dominant, but the western contained abundant Dehalococcoidia, and Gammaproteobacteria, such as Alteromonadales and Oceanospirillales. Combined with the results of higher bacteria abundance and probable shallower aerobic active zone in the eastern core, such patterns of species composition might be related with richer input of labile allochthonous terrestrial organic matter by mass wasting processes in the steeper eastern wall. Our analysis also revealed highly diversified Dehalococcoidia including some new phylotypes, extending the current understandings on Dehalococcoidia diversity. This study fills the gap of benthic microbial study in the NBT, and highlights the need of multi-point sampling in trench studies for the great geographical variations along the trench wall.
机译：新英国沟槽（NBT）的陆地墙是一个活跃的大陆边缘。与被动边距不同，它缺乏大陆崛起和深渊平原，并在海洋沟渠中陡峭的大陆坡。尽管沟槽系统正在接受越来越多的关注，但我们对NBT的微生物学及其沟槽壁的理解有限。在这项研究中，我们分别从NBT的西部和东部陆地墙上收集了70厘米的重心核心（4524米深度）和30厘米的盒式核心（4130米深度）。以2cm深度间隔高分辨率研究微生物群落的多样性和组成。在两个核心中，观察到从有氧的垂直过渡到厌氧但不同的优势厌氧微生物。在东部沟渠墙上，厌氧发酵罐，如厌氧和α-α-α，但西方含有丰富的脱卤，以及altomonodales和Opeanomirlales等丙屈曲的脱卤。结合较高细菌丰富和可能的浅薄弱的有氧活性区在东部核心，这种物种组成模式可能与陡峭的东部墙体中的大规模浪费过程中的不稳定性交陆地有机物的更丰富输入。我们的分析还揭示了高度多元化的脱卤，包括一些新的植物，延长了对脱卤素多样性的当前谅解。本研究填补了底特底特微生物研究的差距，突出了沟槽研究中的多点采样的需求，沿着沟槽墙的巨大地理变量。

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  • 来源
    《Marine biology》 |2020年第11期|172.1-172.13|共13页
  • 作者

    Wang Li; Liu Rulong; Wei Xing; Wang Zixuan; Shen Ziyi; Cao Junwei; Wei Yuli; Xie Zhe; Chen Liangbiao; Fang Jiasong;

  • 作者单位

    Shanghai Ocean Univ Coll Marine Sci Shanghai Engn Res Ctr Hadal Sci & Technol Room 530 3 Bldg Ocean Hitech Pk Lane 218 Shanghai 201306 Peoples R China;

    Shanghai Ocean Univ Coll Marine Sci Shanghai Engn Res Ctr Hadal Sci & Technol Room 530 3 Bldg Ocean Hitech Pk Lane 218 Shanghai 201306 Peoples R China;

    Shanghai Ocean Univ Coll Marine Sci Shanghai Engn Res Ctr Hadal Sci & Technol Room 530 3 Bldg Ocean Hitech Pk Lane 218 Shanghai 201306 Peoples R China;

    Shanghai Ocean Univ Coll Marine Sci Shanghai Engn Res Ctr Hadal Sci & Technol Room 530 3 Bldg Ocean Hitech Pk Lane 218 Shanghai 201306 Peoples R China;

    Shanghai Ocean Univ Coll Marine Sci Shanghai Engn Res Ctr Hadal Sci & Technol Room 530 3 Bldg Ocean Hitech Pk Lane 218 Shanghai 201306 Peoples R China;

    Shanghai Ocean Univ Coll Marine Sci Shanghai Engn Res Ctr Hadal Sci & Technol Room 530 3 Bldg Ocean Hitech Pk Lane 218 Shanghai 201306 Peoples R China;

    Shanghai Ocean Univ Coll Marine Sci Shanghai Engn Res Ctr Hadal Sci & Technol Room 530 3 Bldg Ocean Hitech Pk Lane 218 Shanghai 201306 Peoples R China;

    Shanghai Ocean Univ Coll Marine Sci Shanghai Engn Res Ctr Hadal Sci & Technol Room 530 3 Bldg Ocean Hitech Pk Lane 218 Shanghai 201306 Peoples R China;

    Shanghai Ocean Univ Coll Fisheries & Life Sci Minist Educ Key Lab Aquaculture Resources & Utilizat Shanghai 201306 Peoples R China;

    Shanghai Ocean Univ Coll Marine Sci Shanghai Engn Res Ctr Hadal Sci & Technol Room 530 3 Bldg Ocean Hitech Pk Lane 218 Shanghai 201306 Peoples R China|Qingdao Natl Lab Marine Sci & Technol Marine Biol & Biotechnol Lab Qingdao 266071 Peoples R China;

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