Influence of oyster culture practices and environmental conditions on the ecological status of intertidal mudflats in the Pertuis Charentais (SW France): A multi-index approach

Type Article
Date 2008-11
Language English
Author(s) Bouchet Vincent, Sauriau Pierre-Guy
Affiliation(s) Univ Angers, BIAF, F-49045 Angers, France.
IFREMER, CNRS, ELA, F-17137 Charente Maritime, Lhoumeau, France.
Univ La Rochelle, CNRS, LIENSs, F-17000 La Rochelle, France.
Source Marine Pollution Bulletin (0025-326X) (Elsevier), 2008-11 , Vol. 56 , N. 11 , P. 1898-1912
DOI 10.1016/j.marpolbul.2008.07.010
WOS© Times Cited 41
Keyword(s) Exposed/sheltered, Seasonal variations, Benthic macrofauna, Biotic index, Intertidal mudflats, Oyster farming practices
Abstract The ecological quality status (EcoQ) of intertidal mudflats constrained by Pacific oyster farming was assessed by single (H', AMBI, BENTIX and BOPA) and multimetric (M-AMBI and average score) index approaches in the Pertuis Charentais (SW France). Fifteen sampling stations were monitored seasonally for sedimentological features and macrozoobenthos in 2004. Sediments affected by oyster biodeposits showed organic matter enrichment, and sediments from off-bottom culture sites had higher organic matter contents and lower redox potentials than sediments from on-bottom culture sites. Biotic indices consistently registered responses of macrozoobenthos to organic enrichment but there was only partial agreement between single index-derived EcoQs. The average score was better than M-AMBI and single indices for determining EcoQs. Accordingly, oyster farming alters intertidal macrozoobenthic assemblages moderately, and off-bottom cultures cause more disturbance than on-bottom cultures. Hydrodynamics and seasons may interact with culture practices in smothering/strengthening biodeposition-mediated effects through dispersal/accumulation of biodeposits.
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