AI Article Synopsis
- The study compared the impact of sediment dredging on benthic communities using two sampling methods: grab (1-mm mesh) and dredge (1-cm mesh), at nine sites in Arcachon Bay.
- Significant changes in abundance and community structure were observed for fauna sampled with the dredge method, while grab sampling showed minimal effects from dredging activities.
- The research indicates that dredge sampling may be a more effective method for monitoring ecological changes in sandy shallow channels post-dredging.
Article Abstract
The effect of sediment dredging and disposal work on benthic communities was compared according to two sampling strategies, grab (1-mm mesh) and dredge (1-cm mesh). Nine subtidal, sandy sites were selected in Arcachon Bay (French Atlantic coast), where these operations were performed during winter. Fauna was sampled several months before and one year after the dredging or disposal work. The sediments were fine to medium sands and their characteristics were not modified. In dredging sites, abundance, diversity and community structure of grab sampled fauna were minimally affected by the activities, while abundance and community structure displayed significant changes for dredge sampled fauna. In disposal sites, there was no work effect on fauna, although environmental conditions changed, especially when initial sediments were covered by mussels or seagrass. This study suggests that dredge sampling can be an alternative to grab sampling for monitoring changes related to dredging in sandy shallow channels.
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| http://dx.doi.org/10.1016/j.marpolbul.2023.115278 | DOI Listing |
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