Document Detail

Food web implications of delta13C and delta15N variability over 370 km of the regulated Colorado River USA.
MedLine Citation:
PMID:  11924849     Owner:  NLM     Status:  MEDLINE    
Dual stable isotope analysis in the regulated Colorado River through Grand Canyon National Park, USA, revealed a food web that varied spatially through this arid biome. Down-river enrichment of delta13C data was detected across three trophic levels resulting in shifted food webs. Humpack chub delta13C and delta15N values from muscle plugs and fin clips did not differ significantly. Humpback chub and rainbow trout trophic position is positively correlated with standard length indicating an increase in piscivory by larger fishes. Recovery of the aquatic community from impoundment by Glen Canyon Dam and collecting refinements for stable isotope analysis within large rivers are discussed.
J P Shannon; D W Blinn; G A Haden; E P Benenati; K P Wilson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Isotopes in environmental and health studies     Volume:  37     ISSN:  1025-6016     ISO Abbreviation:  Isotopes Environ Health Stud     Publication Date:  2001  
Date Detail:
Created Date:  2002-04-01     Completed Date:  2002-08-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9602611     Medline TA:  Isotopes Environ Health Stud     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  179-91     Citation Subset:  IM    
Northern Arizona University, Department of Biological Sciences, Flagstaff 86011, USA.
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MeSH Terms
Carbon / analysis,  metabolism*
Carbon Isotopes / pharmacokinetics
Environmental Monitoring
Food Chain*
Nitrogen / analysis,  metabolism*
Nitrogen Isotopes / pharmacokinetics
Reg. No./Substance:
0/Carbon Isotopes; 0/Nitrogen Isotopes; 7440-44-0/Carbon; 7727-37-9/Nitrogen

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

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