NDLI: Ovarian cycle and embryonic development in Gammarus fossarum: application for reproductive toxicity assessment.

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Ovarian cycle and embryonic development in Gammarus fossarum: application for reproductive toxicity assessment.

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Ovarian cycle and embryonic development in Gammarus fossarum: application for reproductive toxicity assessment.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Geffard, Olivier Xuereb, Benoit Chaumot, Arnaud Geffard, Alain Biagianti, Sylvie Noël, Claire Abbaci, Khedidja Garric, Jeanne Charmantier, Guy Charmantier-Daures, Mireille
Description	Country affiliation: France Author Affiliation: Geffard O ( Cemagref, Unité de Recherche des Milieux Aquatiques (UR MALY), 3 bis quai Chauveau-CP 220, F-69336 Lyon, France. olivier.geffard@cemagref.fr)
Abstract	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 µg/L. A restricted food diet led to a significant delay in the molt cycle, which in turn induced inhibition of secondary vitellogenesis.
File Format	HTM / HTML
ISSN	07307268
Issue Number	10
Volume Number	29
e-ISSN	15528618
Journal	Environmental Toxicology and Chemistry
Language	English
Publisher	Wiley
Publisher Date	2010-10-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Water Pollutants, Chemical Research Support, Non-u.s. Gov't Toxicity Discipline Environmental Health Discipline Toxicology Drug Effects Journal Article Reproducibility Of Results Embryology Reproduction Animals Embryo, Nonmammalian Discipline Chemistry Female Physiology Invertebrates
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis

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