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understanding benthic, pelagic and air-borne ecosystem interactions in shallow coastal seas

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Production and consumption of extracellular polymeric substances in an intertidal diatom mat
Moerdijk-Poortvliet, T.C.W.; Beauchard, O.; Stal, L.J.; Boschker, H.T.S. (2018). Production and consumption of extracellular polymeric substances in an intertidal diatom mat. Mar. Ecol. Prog. Ser. 592: 77-95. https://dx.doi.org/10.3354/meps12481
In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630; e-ISSN 1616-1599
Peer reviewed article  

Beschikbaar in  Auteurs 
  • VLIZ: Non-open access 316998 [ aanvragen ]
  • NIOZ: NIOZ Open Repository - Accepted Manuscripts 316993 [ download pdf ]
  • NIOZ: NIOZ files 317000

Trefwoord
    Marien/Kust
Author keywords
    Microphytobenthos; In situ C-13-labeling; Extracellular polymericsubstances

Auteurs  Top 
  • Moerdijk-Poortvliet, T.C.W.
  • Beauchard, O.
  • Stal, L.J.
  • Boschker, H.T.S.

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 13C 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.

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Westbanks is a project Supported by the Belgian Science Policy (BELSPO): SSD Science for sustainable Development
General coordination: Magda Vincx & Jan Vanaverbeke
Hosted by the Flanders Marine Institute VLIZ