Microbial community and geochemical analyses of trans-trench sediments for understanding the roles of hadal environments
| Autor: | Manabu Nishizawa, Akiko Makabe, Hidetaka Nomaki, Eiji Tasumi, Roberto Danovaro, Hiroaki Minegishi, Eugenio Rastelli, Ken Takai, Yohei Matsui, Miwako Tsuda, Satoshi Hiraoka, Miho Hirai, Cinzia Corinaldesi, Juliarni, Takuro Nunoura, Tomo Kitahashi |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Geologic Sediments
Biology Microbiology Deposition (geology) Article Abyssal zone Microbial ecology 03 medical and health sciences Japan Sedimentary organic matter 14. Life underwater Ecology Evolution Behavior and Systematics 030304 developmental biology 0303 health sciences geography geography.geographical_feature_category Nitrates Pacific Ocean Bacteria 030306 microbiology Microbiota Abyssal plain Sediment Hadal zone 15. Life on land Biogeochemistry Environmental sciences Oceanography Benthic zone Trench Geology |
| Zdroj: | The ISME Journal |
| ISSN: | 1751-7370 1751-7362 |
| Popis: | Hadal trench bottom (>6000 m below sea level) sediments harbor higher microbial cell abundance compared with adjacent abyssal plain sediments. This is supported by the accumulation of sedimentary organic matter (OM), facilitated by trench topography. However, the distribution of benthic microbes in different trench systems has not been well explored yet. Here, we carried out small subunit ribosomal RNA gene tag sequencing for 92 sediment subsamples of seven abyssal and seven hadal sediment cores collected from three trench regions in the northwest Pacific Ocean: the Japan, Izu-Ogasawara, and Mariana Trenches. Tag-sequencing analyses showed specific distribution patterns of several phyla associated with oxygen and nitrate. The community structure was distinct between abyssal and hadal sediments, following geographic locations and factors represented by sediment depth. Co-occurrence network revealed six potential prokaryotic consortia that covaried across regions. Our results further support that the OM cycle is driven by hadal currents and/or rapid burial shapes microbial community structures at trench bottom sites, in addition to vertical deposition from the surface ocean. Ourtrans-trench analysis highlights intra- and inter-trench distributions of microbial assemblages and geochemistry in surface seafloor sediments, providing novel insights into ultradeep-sea microbial ecology, one of the last frontiers on our planet. |
| Databáze: | OpenAIRE |
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