The University of Southampton
University of Southampton Institutional Repository

Benthic-pelagic exchange of microalgae at a tidal flat. 2: taxonomic analysis

Record type: Article

Benthic-pelagic exchange of diatoms over a tidal cycle has been examined using a combination of field measurements and annular flume experiments. The relative contribution of benthic and planktonic species to water-column abundance and biomass has been estimated using taxonomic counts, and cell volume to carbon conversions. In June, peaks in chlorophyll a (chl a) biomass occurred either side of the high-water slack period, which corresponded with increased abundance of benthic diatoms, as well as the large centric diatom Coscinodiscus spp. In numerical terms, benthic diatoms accounted for, on average, 15 to 42% of total diatom abundance over the flood-ebb period, while Coscinodiscus spp. accounted for 12 to 17% in June and 3% in late August.
Because of the large size of planktonic forms (e.g., Coscinodiscus spp., Rhizosolenia spp., Biddulphia spp.) compared with the small benthic Nitzschia and Navicula species, the contribution of benthic diatoms was significantly lower in terms of biomass. The average contribution of benthic diatoms to total diatom carbon was <1% in June, but up to 25% in late August. In contrast, the relative contribution of Coscinodiscus spp. was ~90% in June and 73 to 80% in late August. The flume experiments confirmed that, in addition to increased benthic abundance in response to stepwise increases in current velocity, the large centric diatom Coscinodiscus spp. was also resuspended from sediments at high current velocities. At low current velocities, these cells rapidly sank to the seabed, the rate probably enhanced by deposition of sand grains out of the water column. Ecological implications related to water-column biomass and production, macro-infauna diet, and composition of benthic chl a are discussed.

Full text not available from this repository.

Citation

Lucas, Cathy H., Banham, Clare and Holligan, Patrick M. (2001) Benthic-pelagic exchange of microalgae at a tidal flat. 2: taxonomic analysis Marine Ecology Progress Series, 212, pp. 39-52. (doi:10.3354/meps212039).

More information

Published date: 8 March 2001
Keywords: resuspension, sinking, benthic diatoms, phytoplankton, coscinodiscus spp, annular flume, diatoms, flumes, biology

Identifiers

Local EPrints ID: 7857
URI: http://eprints.soton.ac.uk/id/eprint/7857
ISSN: 0171-8630
PURE UUID: 9d33ea29-4a24-4b79-9157-7f687f8fe648
ORCID for Cathy H. Lucas: ORCID iD orcid.org/0000-0002-5929-7481

Catalogue record

Date deposited: 08 Jul 2004
Last modified: 17 Jul 2017 17:14

Export record

Altmetrics

Contributors

Author: Cathy H. Lucas ORCID iD
Author: Clare Banham
Author: Patrick M. Holligan

University divisions


Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×