| Phenylpyrazole insecticide fipronil induces male infertility in the estuarine meiobenthic crustacean Amphiascus tenuiremis. | |
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MedLine Citation:
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PMID: 14750729 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Copepods are the most abundant arthropods on earth and are often the most important secondary producers in estuarine/marine food webs. The new GABA (gamma-aminobutyric acid)-disrupting insecticide fipronil (FP) induces unique sex-specific reproductive dysfunction in male meiobenthic copepods, leading to trans-generational population depression at environmentally realistic concentrations (0.63 microg/L). Using a newly developed 96-well microplate lifecycle bioassay, more than 700 individual Stage-I juveniles were reared to adulthood in as short as 12 days in only 200 microL of control (CTL) or 0.63 microg-FP/L seawater solution. Individual virgin male: female pairs were then cross-mated for all possible combinations within and across rearing treatments and allowed to mate for an additional 12 days in CTL or 0.63 microg-FP/L solution. FP at 0.63 microg/L caused no significant lethality to any mating combinations but evoked 73% or 89% inhibition of reproduction when FP-reared males were mated with either a control- or FP-reared female in FP solution, respectively. In contrast, when CTL-reared males were mated with FP-reared females in FP solution, there was no difference in reproductive success compared to FP-free controls. When FP-reared males were mated with either female group in FP-free solution, these mating pairs displayed a 3-day delay in time to brood sac extrusion but ultimately did reproduce. As fipronil (1) has a high K(ow), (2) is persistent in sediments where meiobenthic copepods live, and (3) has been detected in estuarine waters >0.7 microg/L, it may pose high risk to copepod production in estuarine systems. |
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Authors:
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Tawnya L Cary; G Thomas Chandler; David C Volz; Spencer S Walse; John L Ferry |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Environmental science & technology Volume: 38 ISSN: 0013-936X ISO Abbreviation: Environ. Sci. Technol. Publication Date: 2004 Jan |
Date Detail:
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Created Date: 2004-01-30 Completed Date: 2004-04-22 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0213155 Medline TA: Environ Sci Technol Country: United States |
Other Details:
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Languages: eng Pagination: 522-8 Citation Subset: IM |
Affiliation:
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Department of Environmental Health Sciences, Norman J. Arnold School of Public Health, University of South Carolina, Columbia, South Carolina 29208, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Biological Assay Copepoda / physiology* Female Infertility, Male / chemically induced*, veterinary* Insecticides / toxicity* Male Population Dynamics Pyrazoles / toxicity* Risk Assessment Water Pollutants, Chemical / toxicity* |
| Chemical | |
Reg. No./Substance:
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0/Insecticides; 0/Pyrazoles; 0/Water Pollutants, Chemical; 120068-37-3/fipronil |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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