Document Detail

A field experiment to determine the relative importance of prey and water as sources of As, Cd, Co, Cu, Pb, and Zn for the aquatic invertebrate Sialis velata.
MedLine Citation:
PMID:  16509331     Owner:  NLM     Status:  MEDLINE    
We measured the relative importance of water and food as sources of the trace elements As, Cd, Co, Cu, Pb, and Zn for larvae of the benthic insect Sialis velata. To achieve this end, we first exposed its prey, the midge Chironomus riparius, to trace elements in a contaminated lake located near a nonferrous metal smelter in northwestern Quebec. Concentrations of five of the six trace elements reached a steady state in prey within one week. When predators were exposed to these contaminated prey, their trace element concentrations increased markedly for all of the trace elements studied. In contrast, exposure of S. velata to contaminated lake water led to no significant increase in their concentrations of five of the six trace elements ([Pb] increased only slightly). Additional treatments in which the predator was exposed to these trace elements in both food and water or in a combination of food and water and sediment did not lead to further increases in its contaminant concentrations beyond those measured in the food-only treatment. We conclude that food (prey) is the almost exclusive source of As, Cd, Co, Cu, and Zn for S. velata and that it is the source of 94% of its Pb. Model curves for trace element accumulation over time by the predator fit our measured data well, and trace element concentrations in food alone are sufficient to model the exchange of these contaminants in this insect.
Louis Croisetière; Landis Hare; André Tessier
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  40     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-03-02     Completed Date:  2006-06-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  873-9     Citation Subset:  IM    
Institut National de la Recherche Scientifique-Eau, Terre et Environnement (INRS-ETE), Université du Quebec, 490 rue de la Couronne, Québec, Canada.
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MeSH Terms
Food Chain*
Insects / chemistry*
Metals, Heavy / pharmacokinetics*
Predatory Behavior
Water / chemistry
Water Pollutants / pharmacokinetics
Reg. No./Substance:
0/Metals, Heavy; 0/Water Pollutants; 7732-18-5/Water

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