Document Detail


Global trophic position comparison of two dominant mesopelagic fish families (Myctophidae, Stomiidae) using amino acid nitrogen isotopic analyses.
MedLine Citation:
PMID:  23209656     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The δ(15)N values of organisms are commonly used across diverse ecosystems to estimate trophic position and infer trophic connectivity. We undertook a novel cross-basin comparison of trophic position in two ecologically well-characterized and different groups of dominant mid-water fish consumers using amino acid nitrogen isotope compositions. We found that trophic positions estimated from the δ(15)N values of individual amino acids are nearly uniform within both families of these fishes across five global regions despite great variability in bulk tissue δ(15)N values. Regional differences in the δ(15)N values of phenylalanine confirmed that bulk tissue δ(15)N values reflect region-specific water mass biogeochemistry controlling δ(15)N values at the base of the food web. Trophic positions calculated from amino acid isotopic analyses (AA-TP) for lanternfishes (family Myctophidae) (AA-TP ∼2.9) largely align with expectations from stomach content studies (TP ∼3.2), while AA-TPs for dragonfishes (family Stomiidae) (AA-TP ∼3.2) were lower than TPs derived from stomach content studies (TP∼4.1). We demonstrate that amino acid nitrogen isotope analysis can overcome shortcomings of bulk tissue isotope analysis across biogeochemically distinct systems to provide globally comparative information regarding marine food web structure.
Authors:
C Anela Choy; Peter C Davison; Jeffrey C Drazen; Adrian Flynn; Elizabeth J Gier; Joel C Hoffman; Jennifer P McClain-Counts; Todd W Miller; Brian N Popp; Steve W Ross; Tracey T Sutton
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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.     Date:  2012-11-28
Journal Detail:
Title:  PloS one     Volume:  7     ISSN:  1932-6203     ISO Abbreviation:  PLoS ONE     Publication Date:  2012  
Date Detail:
Created Date:  2012-12-04     Completed Date:  2013-06-24     Revised Date:  2013-07-11    
Medline Journal Info:
Nlm Unique ID:  101285081     Medline TA:  PLoS One     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e50133     Citation Subset:  IM    
Affiliation:
University of Hawaii, Department of Oceanography, Honolulu, Hawaii, United States of America. cachoy@hawaii.edu
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MeSH Terms
Descriptor/Qualifier:
Amino Acids / chemistry
Animals
Ecology
Ecosystem
Fishes / metabolism*
Food Chain
Gastrointestinal Contents / chemistry
Geography
Geology
Nitrogen / chemistry*
Nitrogen Isotopes / chemistry*
Phenylalanine / chemistry
Species Specificity
Stomach / metabolism
Chemical
Reg. No./Substance:
0/Amino Acids; 0/Nitrogen Isotopes; 63-91-2/Phenylalanine; 7727-37-9/Nitrogen
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