Document Detail

Behavioral responses to sublethal cadmium exposure within an experimental aquatic food web.
MedLine Citation:
PMID:  15720005     Owner:  NLM     Status:  MEDLINE    
The foraging and predator-avoidance behaviors of mayfly (Baetis tricaudatus) nymphs and predator-prey interactions were investigated under differing combinations of cadmium concentration and predation risk. Predators consisted of stonefly (Kogotus nonus) nymphs, juvenile brook trout (Salvelinus fontinalis), and longnose dace (Rhinichthys cataractae), either alone or in combination. Organisms were exposed to 0, 0.5, or 5.0 microg/L Cd for 7 d (invertebrates) or 30 d (vertebrates) prior to observation in artificial stream channels. Behavioral observations (20-min duration) were made both day and night over a 24-h period. Mayfly feeding rate was assessed by image analysis of grazed diatom mats cultured on ceramic tiles. Both predators and cadmium produced significant effects on the behavior of B. tricaudatus and K. nonus nymphs, with mayflies showing a hierarchical response in the presence of multiple predators. A significant increase in activity was observed in S. fontinalis exposed to 5.0 microg/L Cd, with significant decreases in capture efficiency of prey items apparent at 0.5 microg/L Cd. Conversely, the foraging behavior of R. cataractae was unaffected by cadmium, possibly as a result of species-specific cadmium tolerance. Such sublethal effects of a contaminant on the energy budgets of individuals and the interactions between species have implications for community structure in aquatic food webs.
David J Riddell; Joseph M Culp; Donald J Baird
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental toxicology and chemistry / SETAC     Volume:  24     ISSN:  0730-7268     ISO Abbreviation:  Environ. Toxicol. Chem.     Publication Date:  2005 Feb 
Date Detail:
Created Date:  2005-02-21     Completed Date:  2005-05-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8308958     Medline TA:  Environ Toxicol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  431-41     Citation Subset:  IM    
National Water Research Institute/Canadian Rivers Institute, Department of Biology, University of New Brunswick, Fredericton, New Brunswick E3B 6E1, Canada.
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MeSH Terms
Behavior, Animal / drug effects*
Cadmium / toxicity*
Dose-Response Relationship, Drug
Fishes / metabolism*
Food Chain
Fresh Water
Insects / drug effects*,  metabolism
Nymph / drug effects*,  metabolism
Species Specificity
Time Factors
Water Pollutants, Chemical / toxicity*
Reg. No./Substance:
0/Water Pollutants, Chemical; 7440-43-9/Cadmium

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

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