Response of Bacterial Metabolic Activity to the River Discharge in the Pearl River Estuary: Implication for CO₂ Degassing Fluxes.

ABSTRACT: Bacterial production (BP), respiration (BR) and growth efficiency (BGE) were simultaneously determined along an environmental gradient in the Pearl River Estuary (PRE) in the wet season (May 2015) and the dry season (January 2016), in order to examine bacterial responses to the riverine dissolved organic carbon (DOC) in the PRE. The Pearl River discharge delivered labile dissolved organic matters (DOM) with low DOC:DON ratio, resulting in a clear gradient in DOC concentrations and DOC:DON ratios. BP (3.93-144 μg C L^-1 d^-1) was more variable than BR (64.6-567 μg C L^-1 d^-1) in terms of the percentage, along an environmental gradient in the PRE. In response to riverine DOC input, BP and the cell-specific BP increased; in contrast, the cell-specific

SUBMITTER: Li X 

PROVIDER: S-EPMC6548906 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature