Document Detail

Daphnia magna feeding behavior after exposure to tetradifon and recovery from intoxication.
MedLine Citation:
PMID:  10499987     Owner:  NLM     Status:  MEDLINE    
The feeding behavior of the cladocera Daphnia magna subjected to a short-term exposure to the acaricide tetradifon (4-chlorophenyl 2,4, 5-trichlorophenyl sulfone) was studied. The experiments were performed using the unicellular algae Nannochloris oculata at a density of 5x10(5) cells/ml as food for the organisms. In a first experiment, three generations (F0, F1, and F3) of the daphnids were exposed to sublethal levels of tetradifon (0.1, 0.18, 0.22, and 0.44 mg/l) and the effect of the toxicant on filtration and ingestion rates was determined. Rates of filtration and ingestion of D. magna declined in the three generations studied with increasing toxicant concentrations; however, toxicant effect was greater in daphnids from generations F1 and F3 than in those from the parental generation F0. A second experiment was conducted in order to evaluate whether animals of a first (1) or third (F3) generation coming from parental daphnids (F0) previously exposed to those pesticide concentrations exhibited any alteration in feeding behavior when transferred to clean water (recovery period). The results indicated that the feeding rates of D. magna generations F1 and F3 were still affected during the recovery period but to a less degree. The effective tetradifon concentrations D. magna at which feeding rates were reduced to 50% that of controls (EC(50)) were also calculated.
M J Villarroel; M D Ferrando; E Sancho; E Andreu
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ecotoxicology and environmental safety     Volume:  44     ISSN:  0147-6513     ISO Abbreviation:  Ecotoxicol. Environ. Saf.     Publication Date:  1999 Sep 
Date Detail:
Created Date:  1999-10-26     Completed Date:  1999-10-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7805381     Medline TA:  Ecotoxicol Environ Saf     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  40-6     Citation Subset:  IM    
Copyright Information:
Copyright 1999 Academic Press.
Department of Animal Biology (Animal Physiology), Faculty of Biological Sciences, University of Valencia, Dr. Moliner 50, Burjasot, Valencia, E-46100, Spain.
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MeSH Terms
Biological Assay
Daphnia / physiology*
Feeding Behavior*
Hydrocarbons, Chlorinated / toxicity*
Insecticides / toxicity*
Water Pollutants, Chemical / toxicity
Reg. No./Substance:
0/Hydrocarbons, Chlorinated; 0/Insecticides; 0/Water Pollutants, Chemical; 116-29-0/tetradifon

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