Document Detail

Toxicity and bioconcentration potential of the agricultural pesticide endosulfan in phytoplankton and zooplankton.
MedLine Citation:
PMID:  11815808     Owner:  NLM     Status:  MEDLINE    
Agricultural pesticide runoff in southeastern coastal regions of the United States is a critical issue. Bioconcentration of pesticides by phytoplankton and zooplankton at the base of the aquatic food web may increase the persistence of pesticides in aquatic ecosystems and cause effects at higher trophic levels. This study examined the toxicity of a widely used agricultural pesticide, endosulfan, to Pseudokirchneriella subcapitatum (freshwater green alga) and Daphnia magna (freshwater cladoceran). We then investigated the potential of both plankton species to sequester endosulfan from their surrounding media. We also assessed the degree to which endosulfan is accumulated by D. magna via food (endosulfan-contaminated P. subcapitatum). A 96-h growth rate EC50 of 427.80 microg/L endosulfan was determined for P. subcapitatum, whereas a 24-h immobilization EC50 of 366.33 microg/L endosulfan was determined for D. magna. The 5-h EC50s for filtration and ingestion in D. magna were 165.57 microg/L and 166.44 microg/L, respectively. An average bioconcentration factor (BCF) of 2,682 was determined for P. subcapitatum exposed to 100 microg/L endosulfan for 16 h. An average BCF of 3,278 was determined for D. magna in a 100 microg/L endosulfan water-only exposure. There was negligible uptake of endosulfan by D. magna feeding on contaminated algae in clean water (BCF approximately 0). Different proportions of parent isomers (endosulfan I and II) and the primary degradation product (endosulfan sulfate) were detected among treatments. Endosulfan was rapidly accumulated and concentrated from water by P. subcapitatum and D. magna neonates. Endosulfan contained in phytoplankton, however, was not bioaccumulated by zooplankton. These findings may prove useful in assessing ecosystem risk, because uptake from the water column appears to be the dominant route for bioconcentration of endosulfan by zooplankton.
M E DeLorenzo; L A Taylor; S A Lund; P L Pennington; E D Strozier; M H Fulton
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Archives of environmental contamination and toxicology     Volume:  42     ISSN:  0090-4341     ISO Abbreviation:  Arch. Environ. Contam. Toxicol.     Publication Date:  2002 Feb 
Date Detail:
Created Date:  2002-01-29     Completed Date:  2002-03-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0357245     Medline TA:  Arch Environ Contam Toxicol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  173-81     Citation Subset:  IM    
U.S. Department of Commerce/NOAA, National Ocean Service, Center for Coastal Environmental Health and Biomolecular Research, 219 Fort Johnson Road, Charleston, South Carolina 29412, USA.
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MeSH Terms
Algae, Green*
Biological Availability
Endosulfan / metabolism,  pharmacokinetics*,  toxicity*
Food Chain
Hydrocarbons, Chlorinated*
Insecticides / metabolism,  pharmacokinetics*,  toxicity*
Lethal Dose 50
Risk Assessment
Tissue Distribution
Water Pollutants, Chemical / metabolism,  pharmacokinetics*,  toxicity*
Reg. No./Substance:
0/Hydrocarbons, Chlorinated; 0/Insecticides; 0/Water Pollutants, Chemical; 115-29-7/Endosulfan

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

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