Document Detail

Effects of food availability on the acute and chronic toxicity of the insecticide methomyl to Daphnia spp.
MedLine Citation:
PMID:  17727918     Owner:  NLM     Status:  MEDLINE    
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.
Joana Luísa Pereira; Fernando Gonçalves
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-08-28
Journal Detail:
Title:  The Science of the total environment     Volume:  386     ISSN:  0048-9697     ISO Abbreviation:  Sci. Total Environ.     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2007-09-11     Completed Date:  2007-11-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0330500     Medline TA:  Sci Total Environ     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  9-20     Citation Subset:  IM    
CESAM & Department of Biology, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
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MeSH Terms
Animal Feed*
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
Reg. No./Substance:
0/Insecticides; 16752-77-5/Methomyl

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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