Organic Matter Composition at Ocean Station Papa Affects Its Bioavailability, Bacterioplankton Growth Efficiency and the Responding Taxa.

ABSTRACT: The bioavailability of organic matter (OM) to marine heterotrophic bacterioplankton is determined by both the chemical composition of OM and the microbial community composition. In the current study, changes in OM bioavailability were identified at Ocean Station Papa as part of the 2018 Export Processes in the Ocean from Remote Sensing (EXPORTS) field study. Removal rates of carbon (C) in controlled experiments were significantly correlated with the initial composition of total hydrolyzable amino acids, and C removal rates were high when the amino acid degradation index suggested a more labile composition. Carbon remineralization rates averaged 0.19 ± 0.08 μmol C L^-1 d^-1 over 6-10 days while bacterial growth efficiencies averaged 31 ± 7%. Amino acid composition and ta

SUBMITTER: Stephens BM 

PROVIDER: S-EPMC8740527 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature