Sedimentary supply of humic-like fluorescent dissolved organic matter and its implication for chemoautotrophic microbial activity in the Izu-Ogasawara Trench.

ABSTRACT: Microbial community structure in the hadal water is reported to be different from that in the upper abyssal water. However, the mechanism governing the difference has not been fully understood. In this study, we investigate the vertical distributions of humic-like fluorescent dissolved organic matter (FDOM_H), chemoautotrophic production, apparent oxygen utilization (AOU), and N* in the Izu-Ogasawara Trench. In the upper abyssal waters (< 6000 m), FDOM_H has a significantly positive correlation with AOU; FDOM_H deviates from the relationship and increases with depth without involving the increment of AOU in the hadal waters. This suggests that FDOM_H is transferred from the sediments to the hadal waters through pore water, while the FDOM_H

SUBMITTER: Shigemitsu M 

PROVIDER: S-EPMC8463680 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature