Bouchet Vincent M P, Sauriau Pierre-Guy
BIAF, Université d'Angers, 2 Bd Lavoisier, 49045 Angers Cedex, France.
Mar Pollut Bull. 2008 Nov;56(11):1898-912. doi: 10.1016/j.marpolbul.2008.07.010. Epub 2008 Aug 26.
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.
在法国西南部的夏朗德河河口湾，采用单一指标（H'、AMBI、BENTIX和BOPA）和多指标（M-AMBI和平均得分）方法，评估了受太平洋牡蛎养殖影响的潮间带泥滩的生态质量状况（EcoQ）。2004年，对15个采样站进行了季节性监测，以了解沉积学特征和大型底栖动物情况。受牡蛎生物沉积物影响的沉积物显示出有机质富集，与底部养殖场地的沉积物相比，离底养殖场地的沉积物有机质含量更高，氧化还原电位更低。生物指数一致记录了大型底栖动物对有机富集的响应，但单一指数得出的EcoQ之间只有部分一致。在确定EcoQ方面，平均得分优于M-AMBI和单一指数。因此，牡蛎养殖对潮间带大型底栖动物群落有适度影响，离底养殖比底部养殖造成的干扰更大。水动力和季节可能通过生物沉积物的扩散/积累，在抑制/增强生物沉积介导的影响方面与养殖活动相互作用。
