| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
In-situ microcosms, a tool for assessment of pesticide impacts on oyster spat (Crassostrea gigas)
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| Autores: |
Stachowski Haberkorn, S
Quiniou, Francoise
Nedelec, M
Robert, Rene
Limon, G
De La Broise, D
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| Data: |
2008-05
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| Ano: |
2008
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| Palavras-chave: |
Epoxiconazole
Bentazon
Pesticide
Toxicity
Oyster
Microcosm
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| Resumo: |
Effects of the herbicide Basamais (bentazon) and the fungicide Opus (epoxiconazole) on oyster spat (Crassostrea gigas) were assessed using in-situ microcosms in a field experiment lasting 13 days. Six-week-old hatchery spat (mean size 1.1 mm), previously collected on PVC plates, was immersed in glass bottles filled with 200 mu m filtered seawater. Bottles were maintained underwater at 6 m depth and their water content changed every other day. Growth, measured as shell area index increase, was 126 +/- 4% in the control bottles. While no growth differences were observed between control and individual pesticide treatments at 10 mu g l(-1), oysters treated with a mix of 10 mu g l(-1) Opus and 10 mu g l(-1) Basamais showed a 50% growth reduction compared with the control (P < 0.0001), suggesting a synergistic effect of these contaminants. Laboratory controls in microcosms maintained in a water bath with filtered natural light, were not significantly different from in-situ microcosm controls in the field, for organic weight content or growth. This in-situ experiment in microcosms allowed us to conclude that: (1) oyster spat can achieve significant growth in bottles immersed in situ without supplementary food; (2) this microcosm system is reliable and easy to use for environmental toxicity tests with C. gigas spat; (3) such microcosm systems can also be run in a laboratory water bath instead of more technically difficult immersed field experiments; (4) the synergistic effect observed here, at a concentration simulating a peak agricultural runoff event, suggests that the impacts of pesticides could be a real threat for oysters in estuarine areas.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/2008/publication-4134.pdf
DOI:10.1007/s10646-007-0190-9
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| Editor: |
Springer
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| Relação: |
http://archimer.ifremer.fr/doc/00000/4134/
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| Formato: |
application/pdf
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| Fonte: |
Ecotoxicology (0963-9292) (Springer), 2008-05 , Vol. 17 , N. 4 , P. 235-245
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| Direitos: |
2008 Springer. Part of Springer Science+Business Media
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