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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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one publication added to basket [55409]
Observations of resuspended diatoms in the turbid tidal edge Lucas, C.H. (2003). Observations of resuspended diatoms in the turbid tidal edge. J. Sea Res. 50(4): 301-308. http://dx.doi.org/10.1016/j.seares.2003.04.001 In: Journal of Sea Research. Elsevier/Netherlands Institute for Sea Research: Amsterdam; Den Burg. ISSN 1385-1101; e-ISSN 1873-1414, meer

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Beschikbaar in	Auteur
VLIZ: Open access 56831 [ download pdf ]

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Trefwoorden

Algae > Diatoms Motion > Sediment movement > Sediment gravity flows > Turbidity currents Suspended organic matter Suspension > Resuspension Topographic features > Landforms > Coastal landforms > Tidal flats Coscinodiscus C.G. Ehrenberg, 1839 [WoRMS] ANE, Ems-Dollard estuarium [Marine Regions]; ANE, Nederland, Westerschelde, Molenplaat [Marine Regions] Marien/Kust

Author keywords

resuspension; benthic diatoms; tidal flats; HPLC; Westerschelde;Ems-Dollard

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Auteur		Top
Lucas, C.H., meer

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Abstract

Observations of resuspended diatoms in the shallow waters (<60 cm) of the turbid tidal edge are described for single sites on two tidal flats-the Molenplaat in the Westerschelde estuary, and the Hond in the Ems-Dollard estuary, The Netherlands. High concentrations of chlorophyll-a (chl-a) were observed in the trailing edge of the ebbing tide in water depths of <20 cm, after which concentrations decreased markedly. Peak mean values were 19 µg chl-a l-1 in 10 cm of water at the Molenplaat, and 45 µg chl-a l-1 in 5 cm of water at the Hond. Similar trends were observed on the flooding tide, although peak values were far less pronounced (6 and 30 µg chl-a l-1 respectively). Microscopic examination of the diatom community within the turbid tidal edge at the Molenplaat revealed that peaks in biomass were caused by suspended benthic diatoms, as well as the large centric diatom Coscinodiscus sp., particularly on the ebb tide. Planktonic diatoms other than Coscinodiscus sp. were more randomly distributed and did not appear to follow any particular trend. It would seem that as the tide recedes, resuspended benthic diatoms and large Coscinodiscus sp. cells become concentrated in the shallow water. However, the virtual absence of Coscinodiscus sp. from the leading edge of the flooding tide suggests that most of the resuspended cells do not settle to the seabed, but are washed away into the channels. The small peak of benthic diatoms at the leading edge of the flood tide is most likely resuspended locally from the sediment, along with large numbers of diatom frustules.

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