Document Detail

Trophic transfer of Cd from natural periphyton to the grazing mayfly Centroptilum triangulifer in a life cycle test.
MedLine Citation:
PMID:  19647355     Owner:  NLM     Status:  MEDLINE    
In streams, periphyton biofilms are important sinks for trace metals such as cadmium and are primary food sources of many invertebrate consumers. To study Cd trophic transfer, we produced differentially contaminated diets by exposing natural periphyton to environmentally relevant dissolved Cd ranging from 0 to 10 microg L(-1) for 6-7 days using a radiotracer approach. On average, periphyton grown during three different seasons bioconcentrated Cd similarly--approximately 1315 (+/-442) -fold above dissolved concentrations. However, mayfly larvae (Centroptilum triangulifer) raised on these differentially contaminated diets (first instar through adulthood) had significantly higher trophic transfer factors from periphyton grown in Aug and Nov 2008 (4.30 +/- 1.55) than from periphyton grown in Jan 2009 (0.85 +/- 0.21). This Cd bioaccumulation difference is only partially explained by apparent food quality and subsequent growth differences. Taken together, these results suggest that primary producers at the base of food webs drive metal bioaccumulation by invertebrate grazers.
Lingtian Xie; David H Funk; David B Buchwalter
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-07-31
Journal Detail:
Title:  Environmental pollution (Barking, Essex : 1987)     Volume:  158     ISSN:  1873-6424     ISO Abbreviation:  Environ. Pollut.     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2009-11-30     Completed Date:  2010-02-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804476     Medline TA:  Environ Pollut     Country:  England    
Other Details:
Languages:  eng     Pagination:  272-7     Citation Subset:  IM    
Department of Environmental and Molecular Toxicology, North Carolina State University, Raleigh, NC 27695, USA.
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MeSH Terms
Algae / metabolism*
Cadmium / metabolism*
Environmental Monitoring / methods*
Food Chain
Insects / metabolism*
Reg. No./Substance:

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