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Can amino acid carbon isotope ratios distinguish primary producers in a mangrove ecosystem?
MedLine Citation:
PMID:  22638971     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
RATIONALE: The relative contribution of carbon from terrestrial vs. marine primary producers to mangrove-based food webs can be challenging to resolve with bulk carbon isotope ratios (δ(13) C). In this study we explore whether patterns of δ(13) C values among amino acids (AAs) can provide an additional tool for resolving terrestrial and marine origins of carbon.
METHODS: Amino acid carbon isotope ratios (δ(13) C(AA) ) were measured for several terrestrial and marine primary producers in a mangrove ecosystem at Spanish Lookout Caye (SLC), Belize, using gas chromatography-combustion-isotope ratio mass spectrometry. The δ(13) C values of essential amino acids (δ(13) C(EAA) ) were measured to determine whether they could be used to differentiate terrestrial and marine producers using linear discriminant analysis.
RESULTS: Marine and terrestrial producers had distinct patterns of δ(13) C(EAA) values in addition to their differences in bulk δ(13) C values. Microbial mat samples and consumers (Crassostrea rhizophorae, Aratus pisonii, Littoraria sp., Lutjanus griseus) were most similar to marine producers. Patterns of δ(13) C(EAA) values for terrestrial producers were very similar to those described for other terrestrial plants.
CONCLUSIONS: The findings suggest that δ(13) C(EAA) values may provide another tool for estimating the contribution of terrestrial and marine sources to detrital foodwebs. Preliminary analyses of consumers indicate significant use of aquatic resources, consistent with other studies of mangrove foodwebs. Copyright © 2012 John Wiley & Sons, Ltd.
Authors:
Thomas Larsen; Matthew J Wooller; Marilyn L Fogel; Diane M O'Brien
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Rapid communications in mass spectrometry : RCM     Volume:  26     ISSN:  1097-0231     ISO Abbreviation:  Rapid Commun. Mass Spectrom.     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-05-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8802365     Medline TA:  Rapid Commun Mass Spectrom     Country:  England    
Other Details:
Languages:  eng     Pagination:  1541-8     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 John Wiley & Sons, Ltd.
Affiliation:
Leibniz-Laboratory for Radiometric Dating and Stable Isotope Research, Christian-Albrechts-Universität zu Kiel, 24118, Kiel, Germany; Biogeodynamics and Biodiversity Group, Centre for Advanced Studies of Blanes (CEAB), Spanish Research Council (CSIC), 17300, Blanes, Catalonia, Spain.
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