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Auteur (up) Geffard, O.; Xuereb, B.; Chaumot, A.; Geffard, A.; Biagianti, S.; Noel, C.; Abbaci, K.; Garric, J.; Charmantier, G.; Charmantier-Daures, M. url  doi
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  Titre Ovarian cycle and embryonic development in gammarus fossarum: Application for reproductive toxicity assessment Type Article scientifique
  Année 2010 Publication Revue Abrégée Environ. Toxicol. Chem.  
  Volume 29 Numéro 10 Pages 2249-2259  
  Mots-Clés Endocrine disruption; Gammarus fossarum; Molt cycle; Reproductive cycle; Reproductive toxicity; acetylcholinesterase activity; amphipod monoporeia-affinis; aquatic environment; behavioral-responses; crustacea-amphipoda; estuarine sediments; melita-plumulosa zeidler; multilevel assessment; pulex crustacea; test  
  Résumé Among freshwater invertebrates, Gammarus fossarum is an important test organism and is currently used in ecotoxicology for acute and chronic assays; nevertheless, reproductive toxicity test methods are not yet available for these species. In the present study, the reproductive cycle in Gammarus fossarum was characterized in order to propose a reproductive toxicity test encompassing molting, follicle growth, and embryonic development that will provide a better understanding of the mode of action of chemicals disrupting these hormone-regulated processes. A detailed description of the reproductive cycle in Gammarus fossarum was obtained. As in some amphipods, molt and reproductive cycles of G. fossarum females occur concurrently, lasting 30 d at 12 C. Each molt stage is characterized by a specific marsupial embryonic development stage and the size of developing follicles visible on the ovarian membrane. Based on these results, a 21 -d reproductive toxicity test is proposed for this species. This new bioassay was applied to identify the specific impact of different stressors: cadmium, methomyl, nonylphenol, and a starvation diet. Good reproducibility was obtained for different endpoints under control conditions and throughout the experiments. Preliminary robust reference values or benchmarks were proposed for these endpoints. Cadmium was found to specially inhibit secondary vitellogenesis. Nonylphenol had a specific concentration-dependent effect on embryonic development, with an increase in the percent abnormality from a concentration of 0.05 mu g/L. A restricted food diet led to a significant delay in the molt cycle, which in turn induced inhibition of secondary vitellogenesis. Environ Toxicol. Chem. 2010;29:2249-2259. (C) 2010 SETAC  
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  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0730-7268 ISBN Médium  
  Région Expédition Conférence  
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  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 758  
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