Global Trophic Position comparison of two dominant Mesopelagic Fish Families (Myctophidae, Stomiidae) using Amino Acid Nitrogen Isotopic Analyses

Choy, C. Anela, Davison, Peter C., Drazen, Jeffrey C., Flynn, Adrian, Gier, Elizabeth J., Hoffman, Joel C., McClain-Counts, Jennifer P., Miller, Todd W., Popp, Brian N., Ross, Steve W. and Sutton, Tracey T. (2012) Global Trophic Position comparison of two dominant Mesopelagic Fish Families (Myctophidae, Stomiidae) using Amino Acid Nitrogen Isotopic Analyses. Plos One, 7 11 Article No.e50133: e50133-1-e50133-7. doi:10.1371/journal.pone.0050133


Author Choy, C. Anela
Davison, Peter C.
Drazen, Jeffrey C.
Flynn, Adrian
Gier, Elizabeth J.
Hoffman, Joel C.
McClain-Counts, Jennifer P.
Miller, Todd W.
Popp, Brian N.
Ross, Steve W.
Sutton, Tracey T.
Title Global Trophic Position comparison of two dominant Mesopelagic Fish Families (Myctophidae, Stomiidae) using Amino Acid Nitrogen Isotopic Analyses
Journal name Plos One   Check publisher's open access policy
ISSN 1932-6203
Publication date 2012-11
Sub-type Article (original research)
DOI 10.1371/journal.pone.0050133
Open Access Status DOI
Volume 7
Issue 11 Article No.e50133
Start page e50133-1
End page e50133-7
Total pages 8
Place of publication San Francisco, CA, United States
Publisher Public Library of Science
Collection year 2013
Language eng
Formatted abstract
The δ15N 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 δ15N values of individual amino acids are nearly uniform within both families of these fishes across five global regions despite great variability in bulk tissue δ15N values. Regional differences in the δ15N values of phenylalanine confirmed that bulk tissue δ15N values reflect region-specific water mass biogeochemistry controlling δ15N 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.
Keyword North Pacific Ocean
Aquatic Food Web
Gulf of Mexico
Stomach Contents
Stable Isotopes
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
School of Biomedical Sciences Publications
 
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