Document Detail

Grit ingestion as a source of metal exposure in the spruce grouse, Dendragapus canadensis.
MedLine Citation:
PMID:  15093036     Owner:  NLM     Status:  PubMed-not-MEDLINE    
The objective of this study was to determine if ingestion of grit was a source of metal exposure to the spruce grouse, Dendragapus canadensis. A secondary objective was to assess whether grit could provide a supplemental source of essential minerals to their diet. Ca, P, Mg, S, Zn, Cu, Ni, Co, Cr, Fe, Mn, Al, Pb and Cd of liver (adult, yearling, chicks), crop and gizzard contents (adults) were determined for grouse collected from a relatively pristine boreal forest region of north-central Ontario, Canada. With the exception of Cd liver, concentrations were independent of age [one-way analysis of variance (ANOVA); p>0.004). Zn liver concentrations tended to be greater in adults than yearlings and chicks (one-way ANOVA; p=0.02). Liver concentrations of Cd increased with age (r=0.99; p<0.001). The contribution of crop items to total gizzard elemental content was element specific; crop contents contributed 90-100% of Mn and Zn, 70% for P and Ca, 60% for Pb, 50% for S, and 0-25% for Cu, Mg, Ni, Al, Fe, Co, Cr and Cd to the total elemental concentration of gizzard contents (crop plus grit). Incorporation of grit by grouse could, therefore, constitute an important source of essential macro-(Ca, P, Mg, S) and trace elements (Cu, Fe) but not for Mn or Zn. However, in addition to providing nutrients to the bird, ingestion of grit results in exposure to toxic trace metals such as Cd which in turn is accumulating in the liver. Research directed at determining grit turnover time, and hence metal exposure rates, in bird species which ingest grit to aid in food digestion is required. The toxicological significance of Cd exposure to grit-ingesting birds needs attention.
L I Bendell-Young; J F Bendell
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Environmental pollution (Barking, Essex : 1987)     Volume:  106     ISSN:  0269-7491     ISO Abbreviation:  Environ. Pollut.     Publication Date:  1999 Sep 
Date Detail:
Created Date:  2004-04-19     Completed Date:  2004-05-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804476     Medline TA:  Environ Pollut     Country:  England    
Other Details:
Languages:  eng     Pagination:  405-12     Citation Subset:  -    
Department of Biological Sciences, Simon Fraser University, 8888 University Ave., Burnaby, BC, Canada V5A 1S6.
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