In the English Channel, the eastern Bay of Seine is exposed to numerous anthropogenic disturbances, in particular major changes in sediment dynamics, which are expected to greatly impact benthic communities. To assess the long-term effects of these stressors on the muddy fine sand benthic community, an original long-term monitoring program has been implemented since 1988. It is based on the sampling of a network of 60 stations during seven surveys over 28 years from 1988 to 2016. We investigate changes of species density, species composition and species diversity at different scales (α-diversity, β-diversity and γ-diversity). Contrary to results obtained in many coastal areas, our results showed a long-term persistence of the community in terms of species composition and structure although a general shift towards muddy sediment has resulted in increased colonisation by species associated with muddy habitats and a decrease in spatial beta diversity.

在英吉利海峡，塞纳河东部湾受到许多人为干扰，尤其是沉积物动力学的重大变化，预计将极大地影响底栖生物群落。为了评估这些压力源对细沙底泥社区的长期影响，从1988年开始实施了一项原始的长期监测计划。该计划基于在28年以来的七次调查中对60个台站的网络采样1988年至2016年。我们研究了不同尺度（α多样性，β多样性和γ多样性）的物种密度，物种组成和物种多样性的变化。与许多沿海地区取得的结果相反，