| Effects of food availability on the acute and chronic toxicity of the insecticide methomyl to Daphnia spp. | |
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MedLine Citation:
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PMID: 17727918 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The widespread increase of pesticides application in crops threats vicinal freshwater lentic ecosystems, frequently leading to their contamination. Due to their position in the aquatic food web, the responses to these pesticide inputs of freshwater filter-feeding zooplankters, as daphnids, provide relevant information the general risk to the ecosystem of xenobiotics. Moreover, cladoceran grazers often face fluctuations in food availability due to the phytoplankton dynamics in lentic water bodies, and food acquisition naturally conditions their fitness. In this study, the responses of Daphnia magna, and of three genotypes within the Daphnia longispina complex, to acute and chronic exposures of methomyl, were assessed. In addition, we focused on whether the food level can model the Daphnia life-history responses to the insecticide. Results showed that methomyl was acutely and chronically toxic to both D. magna and the D. cf longispina populations at very low concentrations, and remarkable differences in sensitivity were noticed when comparing the responses to the toxic among taxa/genotypes. Furthermore, food availability conditioned the overall fitness of the species although not interacting specifically on the response to the toxicant stress. |
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Authors:
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Joana Luísa Pereira; Fernando Gonçalves |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2007-08-28 |
Journal Detail:
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Title: The Science of the total environment Volume: 386 ISSN: 0048-9697 ISO Abbreviation: Sci. Total Environ. Publication Date: 2007 Nov |
Date Detail:
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Created Date: 2007-09-11 Completed Date: 2007-11-13 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0330500 Medline TA: Sci Total Environ Country: Netherlands |
Other Details:
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Languages: eng Pagination: 9-20 Citation Subset: IM |
Affiliation:
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CESAM & Department of Biology, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal. jpereira@ua.pt |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animal Feed* Animals Daphnia / drug effects*, genetics, growth & development Dose-Response Relationship, Drug Feeding Behavior / drug effects* Insecticides / toxicity* Life Cycle Stages / drug effects Methomyl / toxicity* Reproduction / drug effects Species Specificity Toxicity Tests |
| Chemical | |
Reg. No./Substance:
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0/Insecticides; 16752-77-5/Methomyl |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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