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de Montaudouin X, Blanchet H, Gouillieux B, Humbert S, Latry L, Crovetto L, Lavesque N. Benthic community impacts from sediment dredging and disposal: A comparison of sampling gear. Mar Pollut Bull 2023; 194:115278. [PMID: 37453288 DOI: 10.1016/j.marpolbul.2023.115278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 07/05/2023] [Accepted: 07/06/2023] [Indexed: 07/18/2023]
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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Affiliation(s)
- Xavier de Montaudouin
- Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, Station Marine d'Arcachon, F-33600 Pessac, France.
| | - Hugues Blanchet
- Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, Station Marine d'Arcachon, F-33600 Pessac, France
| | - Benoît Gouillieux
- Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, Station Marine d'Arcachon, F-33600 Pessac, France
| | - Suzie Humbert
- Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, Station Marine d'Arcachon, F-33600 Pessac, France; PATRINAT, OFB-MNHN-CNRS-IRD, F-75005 Paris, France
| | - Lise Latry
- Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, Station Marine d'Arcachon, F-33600 Pessac, France
| | - Lucas Crovetto
- Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, Station Marine d'Arcachon, F-33600 Pessac, France
| | - Nicolas Lavesque
- Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, Station Marine d'Arcachon, F-33600 Pessac, France
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Gamain P, Feurtet-Mazel A, Maury-Brachet R, Auby I, Pierron F, Belles A, Budzinski H, Daffe G, Gonzalez P. Can pesticides, copper and seasonal water temperature explain the seagrass Zostera noltei decline in the Arcachon bay? Mar Pollut Bull 2018; 134:66-74. [PMID: 29106936 DOI: 10.1016/j.marpolbul.2017.10.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 10/03/2017] [Accepted: 10/10/2017] [Indexed: 06/07/2023]
Abstract
Dwarf eelgrasses (Zostera noltei) populations have decreased since 2005 in Arcachon Bay (southwest France). Various stressors have been pointed out, however the role of xenobiotics like pesticides or copper (Cu) and of parameters like water temperature warming have not yet been explored. To determine their impact, Z. noltei individuals were collected in a pollution-free site and transferred to the laboratory in seawater microcosms. This dwarf eelgrass was exposed to a pesticide cocktail and copper, alone or simultaneously, at temperatures (10°C, 20°C, 28°C) representative of different seasons. After a two-week contamination, leaf growth, leaf bioaccumulation of Cu, and differential expression of target genes were studied. Eelgrasses bioaccumulated Cu regardless of the temperature, with reduced efficiency in the presence of the Cu and pesticide cocktail at the two higher temperatures. High temperature also exacerbated the effect of contaminants, leading to growth inhibition and differential gene expression. Mitochondrial activity was strongly impacted and higher mortality rates occurred. Experimental results have been confirmed during field survey. This is the first report on the impacts on Z. noltei of pesticides and Cu associate to temperature.
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Affiliation(s)
- Perrine Gamain
- Univ. Bordeaux, UMR EPOC CNRS 5805, Aquatic ecotoxicology team, 33120 Arcachon, France
| | - Agnès Feurtet-Mazel
- Univ. Bordeaux, UMR EPOC CNRS 5805, Aquatic ecotoxicology team, 33120 Arcachon, France
| | - Régine Maury-Brachet
- Univ. Bordeaux, UMR EPOC CNRS 5805, Aquatic ecotoxicology team, 33120 Arcachon, France
| | - Isabelle Auby
- IFREMER Arcachon, Laboratoire Environnement Ressources, Quai du Cdt Silhouette, 33120 Arcachon, France
| | - Fabien Pierron
- Univ. Bordeaux, UMR EPOC CNRS 5805, Aquatic ecotoxicology team, 33120 Arcachon, France
| | - Angel Belles
- Univ. Bordeaux, UMR EPOC CNRS 5805, LPTC team, 33615 Pessac, France
| | - Hélène Budzinski
- Univ. Bordeaux, UMR EPOC CNRS 5805, LPTC team, 33615 Pessac, France
| | - Guillemine Daffe
- Univ. Bordeaux, UMR EPOC CNRS 5805, Aquatic ecotoxicology team, 33120 Arcachon, France
| | - Patrice Gonzalez
- Univ. Bordeaux, UMR EPOC CNRS 5805, Aquatic ecotoxicology team, 33120 Arcachon, France.
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