Document Detail


Ecological tracers can quantify food web structure and change.
MedLine Citation:
PMID:  17007117     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Disruption of natural food webs is becoming a commonplace occurrence as a result of human activities. Considering this, there is a need to improve our ability to define food web structure as well as to detect and understand the implications of trophodynamic change. This requires the development, validation, and application of ecologicaltracers that can provide insights into the movement of energy, nutrients, and contaminants through food webs. In this study, we examine the utility of two groups of naturally occurring intrinsic tracers (stable nitrogen isotopes and fatty acids) to provide such information in a predatory seabird, the herring gull (Larus argentatus). Spatial and temporal patterns in gull trophic position (inferred from egg stable nitrogen isotope values) were related to gull diet composition (inferred from egg fatty acid concentrations). These two independent groups of ecological tracers provided corroborating evidence that gull trophic position was related to the degree to which aquatic foods, namely fish, were consumed. The use of these tracers in concert led to a better understanding of routes of energy flow and contaminant transfer in food webs and how these pathways may be affected by ecosystem change.
Authors:
Craig E Hebert; Michael T Arts; D V Chip Weseloh
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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 Sep 
Date Detail:
Created Date:  2006-09-29     Completed Date:  2006-12-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5618-23     Citation Subset:  IM    
Affiliation:
Environment Canada, Canadian Wildlife Service, National Wildlife Research Centre, 1125 Colonel By Drive, Ottawa, Ontario, K1A 0H3, Canada. craig.hebert@ec.gc.ca
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MeSH Terms
Descriptor/Qualifier:
Animals
Charadriiformes
Ecosystem*
Eggs / analysis
Environmental Monitoring / methods*
Fatty Acids / analysis,  metabolism
Fishes
Food Chain*
Humans
Chemical
Reg. No./Substance:
0/Fatty Acids

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


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