期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 112, 期 11, 页码 E1230-E1236出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1421816112
关键词
hadal; trench; niche separation; nitrification; Challenger Deep
资金
- Japan Society for the Promotion of Science [24370015]
- Grants-in-Aid for Scientific Research [23224013, 24654160, 26252020] Funding Source: KAKEN
Hadal oceans at water depths below 6,000 m are the least-explored aquatic biosphere. The Challenger Deep, located in the western equatorial Pacific, with a water depth of similar to 11 km, is the deepest ocean on Earth. Microbial communities associated with waters from the sea surface to the trench bottom (0 similar to 10,257 m) in the Challenger Deep were analyzed, and unprecedented trench microbial communities were identified in the hadal waters (6,000 similar to 10,257 m) that were distinct from the abyssal microbial communities. The potentially chemolithotrophic populations were less abundant in the hadal water than those in the upper abyssal waters. The emerging members of chemolithotrophic nitrifiers in the hadal water that likely adapt to the higher flux of electron donors were also different from those in the abyssal waters that adapt to the lower flux of electron donors. Species-level niche separation in most of the dominant taxa was also found between the hadal and abyssal microbial communities. Considering the geomorphology and the isolated hydrotopographical nature of the Mariana Trench, we hypothesized that the distinct hadal microbial ecosystem was driven by the endogenous recycling of organic matter in the hadal waters associated with the trench geomorphology.
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