| Fipronil effects on estuarine copepod (Amphiascus tenuiremis) development, fertility, and reproduction: a rapid life-cycle assay in 96-well microplate format. | |
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MedLine Citation:
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PMID: 14768875 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Fipronil is a novel gamma-aminobutyric acid receptor-specific phenylpyrazole insecticide commonly used near estuarine environments for rice production, turf-grass management, and residential insect control. In this study, we evaluated the acute, developmental, and reproductive toxicity of fipronil to the estuarine harpacticoid copepod Amphiascus tenuiremis. Fipronil was highly toxic to A. tenuiremis (adult 96-h median lethal concentration [LC50] = 6.8 microg/L) and was more toxic to male copepods (96-h LC50 = 3.5 microg/L) than to nongravid female copepods (96-h LC50 = 13.0 microg/L). By using a newly developed 96-well microplate-based life-cycle toxicity test, we successfully reared single individuals of A. tenuiremis to adulthood in 200-microl microwells and concurrently assessed developmental and reproductive effects (after paired virginal matings) of environmentally relevant aqueous fipronil concentrations (0.16, 0.22, and 0.42 microg/L measured). Throughout the entire life cycle, copepod survival in all treatments was >90%. However, fipronil at 0.22 microg/L and higher significantly delayed male and female development from stage 1 copepodite to adult by approximately 2 d. More importantly, fipronil significantly halted female egg extrusion by 71% in the 0.22-microg/L fipronil treatment, and nearly eliminated reproduction (94% failure) in the 0.42-microg/L fipronil treatment. A three-generation Leslie matrix-based population growth model of fipronil reproductive and life-cycle impacts predicted a 62% decline in population size of A. tenuiremis relative to controls at only 0.16 microg/L. |
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Authors:
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G Thomas Chandler; Tawnya L Cary; David C Volz; Spencer S Walse; John L Ferry; Susan L Klosterhaus |
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Publication Detail:
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Type: Historical Article; Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Environmental toxicology and chemistry / SETAC Volume: 23 ISSN: 0730-7268 ISO Abbreviation: Environ. Toxicol. Chem. Publication Date: 2004 Jan |
Date Detail:
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Created Date: 2004-02-10 Completed Date: 2004-05-13 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8308958 Medline TA: Environ Toxicol Chem Country: United States |
Other Details:
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Languages: eng Pagination: 117-24 Citation Subset: IM |
Affiliation:
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Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, Columbia, South Carolina 29208, USA. chandlgt@gwm.sc.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Copepoda / growth & development, physiology* Environmental Exposure* Female Fertility / drug effects* History, 15th Century Insecticides / toxicity* Larva / growth & development Lethal Dose 50 Male Population Dynamics Pyrazoles / toxicity* 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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