Data from: Amino acid δ15N underestimation of cetacean trophic positions highlights poor understanding of isotopic fractionation in higher marine consumers
Compound specific stable isotope analysis (CSIA) of amino acids (AAs) has been rapidly incorporated in ecological studies to resolve consumer trophic position (TP). Differential 15 N fractionation of 'trophic' AAs, which undergo 15 N enrichment with each trophic step, and 'source'...
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ftzenodo:oai:zenodo.org:4532251 2024-09-15T17:59:04+00:00 Data from: Amino acid δ15N underestimation of cetacean trophic positions highlights poor understanding of isotopic fractionation in higher marine consumers Matthews, Cory Ruiz-Cooley, Iliana Pomerleau, Corinne Ferguson, Steven 2021-02-10 https://doi.org/10.5061/dryad.9kd51c5d3 unknown Zenodo https://doi.org/10.1017/S0025315413001379 https://doi.org/10.3354/meps11145 https://doi.org/10.1007/s00300-017-2136-x https://doi.org/10.3354/meps12281 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.9kd51c5d3 oai:zenodo.org:4532251 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode Amino acids isotopic fractionation marine consumers info:eu-repo/semantics/other 2021 ftzenodo https://doi.org/10.5061/dryad.9kd51c5d310.1017/S002531541300137910.3354/meps1114510.1007/s00300-017-2136-x10.3354/meps12281 2024-07-26T18:33:43Z Compound specific stable isotope analysis (CSIA) of amino acids (AAs) has been rapidly incorporated in ecological studies to resolve consumer trophic position (TP). Differential 15 N fractionation of 'trophic' AAs, which undergo 15 N enrichment with each trophic step, and 'source' AAs, which undergo minimal trophic 15 N enrichment and serve as a proxy for primary producer δ 15 N values, allows for internal calibration of TP. Recent studies, however, have shown the difference between source and trophic AA δ 15 N values in higher marine consumers is less than predicted from empirical studies of invertebrates and fish. To evaluate CSIA-AA for estimating TP of cetaceans, we compared source and trophic AA δ 15 N values of multiple tissues (skin, baleen, and dentine collagen) from five species representing a range of TPs: bowhead whales, beluga whales, short-beaked common dolphins, sperm whales, and fish-eating (FE) and marine mammal-eating (MME) killer whale ecotypes. TP estimates (TP CSIA ) using several empirically-derived equations and trophic discrimination factors (TDFs) were 1 to 2.5 trophic steps lower than stomach content-derived estimates (TP SC ) for all species. Although TP CSIA estimates using dual TDF equations were in better agreement with TP SC estimates for bowhead whales, belugas, and FE killer whales, our data do not support the application of a universal or currently available dual TDFs to estimate cetacean TPs. Discrepancies were not simply due to inaccurate TDFs, however, because the difference between consumer glutamic acid (Glu) and phenylalanine (Phe) δ 15 N values (δ 15 N Glu-Phe ) did not follow expected TP order, indicating it is not a reliable index of relative TP in these species. In contrast with pioneering studies on invertebrates and fish, our data suggest trophic 15 N enrichment of Phe is not negligible and should be examined among the potential mechanisms driving 'compressed' and variable δ 15 N Glu-Phe values at high TPs. We emphasize the need for controlled diet studies to clearly ... Other/Unknown Material Beluga Beluga* Killer Whale Killer whale Zenodo |
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Amino acids isotopic fractionation marine consumers |
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Amino acids isotopic fractionation marine consumers Matthews, Cory Ruiz-Cooley, Iliana Pomerleau, Corinne Ferguson, Steven Data from: Amino acid δ15N underestimation of cetacean trophic positions highlights poor understanding of isotopic fractionation in higher marine consumers |
topic_facet |
Amino acids isotopic fractionation marine consumers |
description |
Compound specific stable isotope analysis (CSIA) of amino acids (AAs) has been rapidly incorporated in ecological studies to resolve consumer trophic position (TP). Differential 15 N fractionation of 'trophic' AAs, which undergo 15 N enrichment with each trophic step, and 'source' AAs, which undergo minimal trophic 15 N enrichment and serve as a proxy for primary producer δ 15 N values, allows for internal calibration of TP. Recent studies, however, have shown the difference between source and trophic AA δ 15 N values in higher marine consumers is less than predicted from empirical studies of invertebrates and fish. To evaluate CSIA-AA for estimating TP of cetaceans, we compared source and trophic AA δ 15 N values of multiple tissues (skin, baleen, and dentine collagen) from five species representing a range of TPs: bowhead whales, beluga whales, short-beaked common dolphins, sperm whales, and fish-eating (FE) and marine mammal-eating (MME) killer whale ecotypes. TP estimates (TP CSIA ) using several empirically-derived equations and trophic discrimination factors (TDFs) were 1 to 2.5 trophic steps lower than stomach content-derived estimates (TP SC ) for all species. Although TP CSIA estimates using dual TDF equations were in better agreement with TP SC estimates for bowhead whales, belugas, and FE killer whales, our data do not support the application of a universal or currently available dual TDFs to estimate cetacean TPs. Discrepancies were not simply due to inaccurate TDFs, however, because the difference between consumer glutamic acid (Glu) and phenylalanine (Phe) δ 15 N values (δ 15 N Glu-Phe ) did not follow expected TP order, indicating it is not a reliable index of relative TP in these species. In contrast with pioneering studies on invertebrates and fish, our data suggest trophic 15 N enrichment of Phe is not negligible and should be examined among the potential mechanisms driving 'compressed' and variable δ 15 N Glu-Phe values at high TPs. We emphasize the need for controlled diet studies to clearly ... |
format |
Other/Unknown Material |
author |
Matthews, Cory Ruiz-Cooley, Iliana Pomerleau, Corinne Ferguson, Steven |
author_facet |
Matthews, Cory Ruiz-Cooley, Iliana Pomerleau, Corinne Ferguson, Steven |
author_sort |
Matthews, Cory |
title |
Data from: Amino acid δ15N underestimation of cetacean trophic positions highlights poor understanding of isotopic fractionation in higher marine consumers |
title_short |
Data from: Amino acid δ15N underestimation of cetacean trophic positions highlights poor understanding of isotopic fractionation in higher marine consumers |
title_full |
Data from: Amino acid δ15N underestimation of cetacean trophic positions highlights poor understanding of isotopic fractionation in higher marine consumers |
title_fullStr |
Data from: Amino acid δ15N underestimation of cetacean trophic positions highlights poor understanding of isotopic fractionation in higher marine consumers |
title_full_unstemmed |
Data from: Amino acid δ15N underestimation of cetacean trophic positions highlights poor understanding of isotopic fractionation in higher marine consumers |
title_sort |
data from: amino acid δ15n underestimation of cetacean trophic positions highlights poor understanding of isotopic fractionation in higher marine consumers |
publisher |
Zenodo |
publishDate |
2021 |
url |
https://doi.org/10.5061/dryad.9kd51c5d3 |
genre |
Beluga Beluga* Killer Whale Killer whale |
genre_facet |
Beluga Beluga* Killer Whale Killer whale |
op_relation |
https://doi.org/10.1017/S0025315413001379 https://doi.org/10.3354/meps11145 https://doi.org/10.1007/s00300-017-2136-x https://doi.org/10.3354/meps12281 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.9kd51c5d3 oai:zenodo.org:4532251 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5061/dryad.9kd51c5d310.1017/S002531541300137910.3354/meps1114510.1007/s00300-017-2136-x10.3354/meps12281 |
_version_ |
1810436005614845952 |