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 |
| |
Authors: | Bouchet Vincent M P Sauriau Pierre-Guy |
| |
Affiliation: | a BIAF, Université d’Angers, 2 Bd Lavoisier, 49045 Angers Cedex, France b ELA, CNRS, Ifremer, Place Gaby Coll, B.P. 5, Charente-Maritime, 17137 L’Houmeau, France c LIENSs, CNRS, Université de La Rochelle, Bâtiment ILE, 2 rue Olympe de Gouges, 17000 La Rochelle, France |
| |
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. |
| |
Keywords: | Oyster farming practices Intertidal mudflats Biotic index Benthic macrofauna Seasonal variations Exposed/sheltered |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|