Document Detail

Tracing carbon flow in an arctic marine food web using fatty acid-stable isotope analysis.
MedLine Citation:
PMID:  18481094     Owner:  NLM     Status:  MEDLINE    
Global warming and the loss of sea ice threaten to alter patterns of productivity in arctic marine ecosystems because of a likely decline in primary productivity by sea ice algae. Estimates of the contribution of ice algae to total primary production range widely, from just 3 to >50%, and the importance of ice algae to higher trophic levels remains unknown. To help answer this question, we investigated a novel approach to food web studies by combining the two established methods of stable isotope analysis and fatty acid (FA) analysis--we determined the C isotopic composition of individual diatom FA and traced these biomarkers in consumers. Samples were collected near Barrow, Alaska and included ice algae, pelagic phytoplankton, zooplankton, fish, seabirds, pinnipeds and cetaceans. Ice algae and pelagic phytoplankton had distinctive overall FA signatures and clear differences in delta(13)C for two specific diatom FA biomarkers: 16:4n-1 (-24.0+/-2.4 and -30.7+/-0.8 per thousand, respectively) and 20:5n-3 (-18.3+/-2.0 and -26.9+/-0.7 per thousand, respectively). Nearly all delta(13)C values of these two FA in consumers fell between the two stable isotopic end members. A mass balance equation indicated that FA material derived from ice algae, compared to pelagic diatoms, averaged 71% (44-107%) in consumers based on delta(13)C values of 16:4n-1, but only 24% (0-61%) based on 20:5n-3. Our estimates derived from 16:4n-1, which is produced only by diatoms, probably best represented the contribution of ice algae relative to pelagic diatoms. However, many types of algae produce 20:5n-3, so the lower value derived from it likely represented a more realistic estimate of the proportion of ice algae material relative to all other types of phytoplankton. These preliminary results demonstrate the potential value of compound-specific isotope analysis of marine lipids to trace C flow through marine food webs and provide a foundation for future work.
S M Budge; M J Wooller; A M Springer; S J Iverson; C P McRoy; G J Divoky
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-05-15
Journal Detail:
Title:  Oecologia     Volume:  157     ISSN:  0029-8549     ISO Abbreviation:  Oecologia     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-07-09     Completed Date:  2008-09-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0150372     Medline TA:  Oecologia     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  117-29     Citation Subset:  IM    
Department of Process Engineering and Applied Science, Dalhousie University, Halifax, NS B3J 2X4, Canada.
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MeSH Terms
Arctic Regions
Biological Markers
Carbon / analysis*
Carbon Isotopes
Diatoms / chemistry*
Fatty Acids / analysis*
Food Chain*
Ice Cover
Population Dynamics
Reg. No./Substance:
0/Biological Markers; 0/Carbon Isotopes; 0/Fatty Acids; 7440-44-0/Carbon

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

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