Publication
Title
Production and consumption of extracellular polymeric substances in an intertidal diatom mat
Author
Abstract
We investigated seasonal changes in the production of extracellular polymeric substances (EPS) and short-chain organic acids (SCOA) exuded by benthic diatoms, and the use of these exudates as a carbon source by heterotrophic bacteria. An in situ C-13 pulse-chase method was used to follow the fate of EPS for 5 consecutive days. These experiments were done at 2 mo intervals for 1 yr. The EPS were recovered from the sediment as 2 operationally defined fractions (i.e. water-extractable and EDTA-extractable EPS). Seasonal differences in EPS production correlated to light intensity and temperature. From February until June the biomass and production of diatoms and bacteria were closely coupled. It was concluded that SCOA were the most important substrates for the bacteria. Sulfate-reducing bacteria (SRB) in particular benefited from SCOA released by diatoms. From August on, the coupling of biomass and production of diatoms and bacteria weakened and was almost lost in December. During the period from August to December, EPS produced by diatoms promoted the growth of other bacterial taxa rather than SRB, and the production of SCOA was low. Thus, it appears that the seasonal variation in exudates produced by diatoms plays an important role in shaping community composition and maintaining the diversity of the associated bacteria.
Language
English
Source (journal)
Marine ecology progress series. - Halstenbek
Publication
Halstenbek : Inter-research , 2018
ISSN
0171-8630
Volume/pages
592 (2018) , p. 77-95
ISI
000428818700005
Full text (Publisher's DOI)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 04.05.2018
Last edited 20.09.2021
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