Combined Carbohydrates Support Rich Communities of Particle-Associated Marine Bacterioplankton.

Sperling, Martin, Piontek, Judith, Engel, Anja , Wiltshire, Karen H., Niggemann, Jutta, Gerdts, Gunnar and Wichels, Antje (2017) Combined Carbohydrates Support Rich Communities of Particle-Associated Marine Bacterioplankton. Open Access Frontiers in Microbiology, 8 . Art.Nr. 65. DOI 10.3389/fmicb.2017.00065.

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Carbohydrates represent an important fraction of labile and semi-labile marine organic matter that is mainly comprised of exopolymeric substances derived from phytoplankton exudation and decay. This study investigates the composition of total combined carbohydrates (tCCHO; >1 kDa) and the community development of free-living (0.2–3 μm) and particle-associated (PA) (3–10 μm) bacterioplankton during a spring phytoplankton bloom in the southern North Sea. Furthermore, rates were determined for the extracellular enzymatic hydrolysis that catalyzes the initial step in bacterial organic matter remineralization. Concentrations of tCCHO greatly increased during bloom development, while the composition showed only minor changes over time. The combined concentration of glucose, galactose, fucose, rhamnose, galactosamine, glucosamine, and glucuronic acid in tCCHO was a significant factor shaping the community composition of the PA bacteria. The richness of PA bacteria greatly increased in the post-bloom phase. At the same time, the increase in extracellular β-glucosidase activity was sufficient to explain the observed decrease in tCCHO, indicating the efficient utilization of carbohydrates by the bacterioplankton community during the post-bloom phase. Our results suggest that carbohydrate concentration and composition are important factors in the multifactorial environmental control of bacterioplankton succession and the enzymatic hydrolysis of organic matter during phytoplankton blooms.

Document Type: Article
Keywords: bacterioplankton community, remineralization, extracellular enzymes, phytoplankton bloom, North Sea, Helgoland Roads, organic matter, spring bloom
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.3389/fmicb.2017.00065
ISSN: 1664-302X
Date Deposited: 31 Jan 2017 09:55
Last Modified: 06 Feb 2020 09:10

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