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Observations of resuspended diatoms in the turbid tidal edge

Record type: Article

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 ? g chl-a l-1 in 10 cm of water at the Molenplaat, and 45 ? g 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 ? g 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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Citation

Lucas, C.H. (2003) Observations of resuspended diatoms in the turbid tidal edge Journal of Sea Research, 50, (4), pp. 301-308. (doi:10.1016/j.seares.2003.04.001).

More information

Published date: 2003
Keywords: Resuspension, Benthic diatoms, Tidal flats, HPLC, Westerschelde, Ems-Dollard

Identifiers

Local EPrints ID: 1323
URI: http://eprints.soton.ac.uk/id/eprint/1323
ISSN: 1385-1101
PURE UUID: e7c03d25-0f55-4389-bdec-c0853ed1c8b5
ORCID for C.H. Lucas: ORCID iD orcid.org/0000-0002-5929-7481

Catalogue record

Date deposited: 16 Apr 2004
Last modified: 17 Jul 2017 17:16

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