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Community structure and seasonal dynamics of diatom biofilms and associated grazers in intertidal mudflats Sahan, E.; Sabbe, K.; Creach, V.; Hernandez-Raquet, G.; Vyverman, W.; Stal, L.J.; Muyzer, G. (2007). Community structure and seasonal dynamics of diatom biofilms and associated grazers in intertidal mudflats. Aquat. Microb. Ecol. 47(3): 253-266. https://dx.doi.org/10.3354/ame047253 In: Aquatic Microbial Ecology. Inter-Research: Oldendorf/Luhe. ISSN 0948-3055; e-ISSN 1616-1564

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Beschikbaar in	Auteurs
VLIZ: Open access 339258 [ download pdf ]

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Trefwoorden

Algae > Diatoms Behaviour > Feeding behaviour > Grazing Biofilms Gradients > Salinity gradients Population dynamics Sedimentary structures > Mud flats Topographic features > Landforms > Coastal landforms > Tidal flats Bacillariophyceae [WoRMS] ANE, Nederland, Westerschelde, Biezelingse Ham Mud Flat [Marine Regions]; ANE, Nederland, Westerschelde, PaulinaSchor [Marine Regions]; ANE, Netherlands, Westerschelde, Appelzak [Marine Regions] Marien/Kust; Brak water

Author keywords

epipelic diatoms; eukaryotes; intertidal mudflat; salinity gradient; seasonal dynamics

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Auteurs		Top
Sahan, E. Sabbe, K. Creach, V. Hernandez-Raquet, G.	Vyverman, W. Stal, L.J. Muyzer, G.

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Abstract

The composition and seasonal dynamics of biofilm-associated eukaryotic communities were analysed at the metre and kilometre scale along a salinity gradient in the Westerschelde estuary (The Netherlands), using microscopy and a genetic fingerprinting technique (PCR-DGGE). Microphytobenthic biomass, measured as chlorophyll a (chl a), varied seasonally over 2 orders of magnitude, being highest in spring. Communities were dominated by epipelic diatoms, in particular by members of the genus Navicula. In spring, a few smaller epipelic diatom species dominated during biomass peaks, while during the rest of the year, communities were more diverse and were characterised by larger species. The microphytobenthic community collapsed when grazers appeared, which happened concomitantly with a rise in temperature. Spring biomass development was associated with marked changes in porewater nutrient concentrations, especially towards the estuary mouth. In the DGGE data, diatoms, ciliates, amoebae, copepods, nematodes, annelids and platyhelminthes were detected. Ordination analysis of the species counts and DGGE data were largely congruent and indicated that on the scale of the whole estuary (i.e. km scale), taxonomic turnover in microphytobenthos composition was mainly associated with the salinity gradient. At smaller spatial scales, the position of sampling localities along the tidal exposure gradient appeared to be the main determinant of species turnover, in particular in the brackish reaches of the estuary.

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