The University of Southampton
University of Southampton Institutional Repository

Influence of biota on spatial and temporal variation in sediment erodability and material flux on a tidal flat (Westerschelde, The Netherlands)

Widdows, J., Brinsley, M.D., Salkeld, P.N. and Lucas, C.H. (2001) Influence of biota on spatial and temporal variation in sediment erodability and material flux on a tidal flat (Westerschelde, The Netherlands) Marine Ecology Progress Series, 194, pp. 23-27. (doi:10.3354/meps194203).

Record type: Article

Abstract

Annular flumes were used to quantlfy benthic-pelaqc exchanges in relation to changes in
current velocity and sediment biota. Various physical, chemical and biological parameters were determined
for 4 sites on the Molenplaat tidal flat in the Westerschelde (The Netherlands) during 2 field
campaigns in May-June and August-September 1996. These Pcluded: the mass of sediment eroded,
maximum and mean erosion rates, critical erosion velocity (Ucfi,), suspension feeding/biodeposition
rate, oxygen and ammonium fluxes, density of macrofauna species, chlorophyll a (chl a), colloidal carbohydrate,
and physical properties of the sediment. The study showed marked and statistically significant
spatial and temporal differences in the potential for sediment erosion. Sites in the centre of
the tidal flat were less erodable than those on the edge. All sites on the tidal flat had a significantly (p <
0.001) lower erosion potential in June (i.e. higher U,,, and lower erosion rates) compared to September.
The presence of a well-developed microphytobenthos community in June resulted in a statistically significant
relationship between U,,, and chl a/colloidal carbohydrate (r = +0.85, p = 0.01). There was a
significant relationship (r = +0.88, p = 0.005) between sediment erodab~lity (mass of sediment eroded
and erosion rate) and the density of the clam Macoma balthica, a major bioturbator of the surface sediment~.
Analysis of the data also demonstrated significant relationships between clearance rate and
Cerastoderma edule biomass (r = +0.91, p < 0.001), and between sedment chl a/colloidal carbohydrate
and C. edule biomass (r = +0.92; p < 0.001), reflecting the influence of suspension feeders on both the
water column and the sediment, through their biodeposits. The significant increase in sediment erodability
between June and September reflected the shift in the overall balance between the major 'biostabilisers'
(microphytobenthos) and 'bio-destabilisers' (bioturbating bivalves). Ths interpretation of
field-derived correlations is consistent with previously established relationships and mechanistic
understanding derived from controlled flume experiments.

Full text not available from this repository.

More information

Published date: 2001
Additional Information: Deposited by Jane Conquer

Identifiers

Local EPrints ID: 63123
URI: http://eprints.soton.ac.uk/id/eprint/63123
ISSN: 0171-8630
PURE UUID: 3fd2325f-4bc6-42c5-aee9-b19132aa082d
ORCID for C.H. Lucas: ORCID iD orcid.org/0000-0002-5929-7481

Catalogue record

Date deposited: 11 Sep 2008
Last modified: 17 Jul 2017 14:19

Export record

Altmetrics

Contributors

Author: J. Widdows
Author: M.D. Brinsley
Author: P.N. Salkeld
Author: C.H. Lucas ORCID iD

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.

×