Document Detail

Relationship between biochemical biomarkers and pre-copulatory behaviour and mortality in Gammarus pulex following pulse-exposure to lambda-cyhalothrin.
MedLine Citation:
PMID:  15825219     Owner:  NLM     Status:  MEDLINE    
The impact of the pyrethroid lambda-cyhalothrin was studied in an in-stream mesocosm placed in a natural riffle of a Danish stream. Twice during summer 2002, the natural macroinvertebrate community was exposed in situ to a 30-min pulse of lambda-cyhalothrin. During exposure, nets caught macroinvertebrates in drift. Exposed and unexposed individuals of the amphipod Gammarus pulex (L) were transferred to aquaria in the laboratory and monitored for biochemical changes (ie biomarkers), pre-copulatory behaviour and mortality. Biochemical biomarkers were identified by screening extracts of exposed and unexposed G pulex using high-performance planar chromatography (HPPC). Biochemical biomarkers were detected 3 h after pulse-exposure, and one biomarker was persistent up to 7 days after exposure. Pre-copulatory behaviour (ie pair formation) was significantly impaired up to 5 days after exposure, and had not fully recovered at the end of the observation period. EC10(0.5 h) and EC50(0.5 h) values for pre-copulatory behaviour were 0.04 and 0.20 microg litre(-1), respectively. Mortality was significant at 0.35 microg litre(-1) with an LC50(0.5 h) of 5.69 microg litre(-1). There was a significant relationship between two biomarkers and mortality. The study demonstrated that pulse-exposure at expected environmental concentrations can reduce local populations of G pulex, resulting in severe impact on populations with limited possibilities of re-colonisation.
Lars-Henrik Heckmann; Nikolai Friberg; Helle W Ravn
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Pest management science     Volume:  61     ISSN:  1526-498X     ISO Abbreviation:  Pest Manag. Sci.     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-06-14     Completed Date:  2005-09-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100898744     Medline TA:  Pest Manag Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  627-35     Citation Subset:  IM    
National Environmental Research Institute, Vejlsøvej 25, PO Box 314, DK-8600 Silkeborg, Denmark.
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MeSH Terms
Amphipoda / drug effects*
Biological Markers
Insecticides / pharmacology*
Nitriles / pharmacology*
Pyrethrins / pharmacology*
Sexual Behavior, Animal / drug effects*
Reg. No./Substance:
0/Biological Markers; 0/Insecticides; 0/Nitriles; 0/Pyrethrins; 68085-85-8/cyhalothrin

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

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