Dietary plasticity and broad North Atlantic origins inferred from bulk and amino acid-specific δ
Killer whales (Orcinus orca) occur seasonally in the eastern Canadian Arctic (ECA), where their range expansion associated with declining sea ice have raised questions about the impacts of increasing killer whale predation pressure on Arctic-endemic prey. We assessed diet and distribution of ECA kil...
Published in: | Journal of Animal Ecology |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2024
|
Subjects: | |
Online Access: | https://doi.org/10.1111/1365-2656.14123 https://pubmed.ncbi.nlm.nih.gov/38956826 |
id |
ftpubmed:38956826 |
---|---|
record_format |
openpolar |
spelling |
ftpubmed:38956826 2024-09-09T19:20:29+00:00 Dietary plasticity and broad North Atlantic origins inferred from bulk and amino acid-specific δ Matthews, Cory J D Yarnes, Chris T Lefort, Kyle J Edkins, Tera L Kiszka, Jeremy J Ferguson, Steven H 2024 Jul 02 https://doi.org/10.1111/1365-2656.14123 https://pubmed.ncbi.nlm.nih.gov/38956826 eng eng Wiley https://doi.org/10.1111/1365-2656.14123 https://pubmed.ncbi.nlm.nih.gov/38956826 © 2024 The Author(s). Journal of Animal Ecology published by John Wiley & Sons Ltd on behalf of British Ecological Society. J Anim Ecol ISSN:1365-2656 Orcinus orca compound‐specific stable isotope analysis of amino acids diet distribution essential source threonine trophic Journal Article 2024 ftpubmed https://doi.org/10.1111/1365-2656.14123 2024-07-03T16:02:00Z Killer whales (Orcinus orca) occur seasonally in the eastern Canadian Arctic (ECA), where their range expansion associated with declining sea ice have raised questions about the impacts of increasing killer whale predation pressure on Arctic-endemic prey. We assessed diet and distribution of ECA killer whales using bulk and compound-specific stable isotope analysis (CSIA) of amino acids (AA) of 54 skin biopsies collected from 2009 to 2020 around Baffin Island, Canada. Bulk ECA killer whale skin δ15N and δ13C values did not overlap with potential Arctic prey after adjustment for trophic discrimination, and instead reflected foraging history in the North Atlantic prior to their arrival in the ECA. Adjusted killer whale stable isotope (SI) values primarily overlapped with several species of North Atlantic baleen whales or tuna. Amino acid (AA)-specific δ15N values indicated the ECA killer whales fed primarily on marine mammals, having similar glutamic acid δ15N-phenylalanine δ15N (δ15NGlx-Phe) and threonine δ15N (δ15NThr) as mammal-eating killer whales from the eastern North Pacific (ENP) that served as a comparative framework. However, one ECA whale grouped with the fish-eating ENP ecotype based δ15NThr. Distinctive essential AA δ13C of ECA killer whale groups, along with bulk SI similarity to killer whales from different regions of the North Atlantic, indicates different populations converge in Arctic waters from a broad source area. Generalist diet and long-distance dispersal capacity favour range expansions, and integration of these insights will be critical for assessing ecological impacts of increasing killer whale predation pressure on Arctic-endemic species. Article in Journal/Newspaper Arctic Baffin Island Baffin baleen whales Killer Whale North Atlantic Orca Orcinus orca Sea ice Killer whale PubMed Central (PMC) Arctic Baffin Island Canada Pacific Journal of Animal Ecology 93 8 1049 1064 |
institution |
Open Polar |
collection |
PubMed Central (PMC) |
op_collection_id |
ftpubmed |
language |
English |
topic |
Orcinus orca compound‐specific stable isotope analysis of amino acids diet distribution essential source threonine trophic |
spellingShingle |
Orcinus orca compound‐specific stable isotope analysis of amino acids diet distribution essential source threonine trophic Matthews, Cory J D Yarnes, Chris T Lefort, Kyle J Edkins, Tera L Kiszka, Jeremy J Ferguson, Steven H Dietary plasticity and broad North Atlantic origins inferred from bulk and amino acid-specific δ |
topic_facet |
Orcinus orca compound‐specific stable isotope analysis of amino acids diet distribution essential source threonine trophic |
description |
Killer whales (Orcinus orca) occur seasonally in the eastern Canadian Arctic (ECA), where their range expansion associated with declining sea ice have raised questions about the impacts of increasing killer whale predation pressure on Arctic-endemic prey. We assessed diet and distribution of ECA killer whales using bulk and compound-specific stable isotope analysis (CSIA) of amino acids (AA) of 54 skin biopsies collected from 2009 to 2020 around Baffin Island, Canada. Bulk ECA killer whale skin δ15N and δ13C values did not overlap with potential Arctic prey after adjustment for trophic discrimination, and instead reflected foraging history in the North Atlantic prior to their arrival in the ECA. Adjusted killer whale stable isotope (SI) values primarily overlapped with several species of North Atlantic baleen whales or tuna. Amino acid (AA)-specific δ15N values indicated the ECA killer whales fed primarily on marine mammals, having similar glutamic acid δ15N-phenylalanine δ15N (δ15NGlx-Phe) and threonine δ15N (δ15NThr) as mammal-eating killer whales from the eastern North Pacific (ENP) that served as a comparative framework. However, one ECA whale grouped with the fish-eating ENP ecotype based δ15NThr. Distinctive essential AA δ13C of ECA killer whale groups, along with bulk SI similarity to killer whales from different regions of the North Atlantic, indicates different populations converge in Arctic waters from a broad source area. Generalist diet and long-distance dispersal capacity favour range expansions, and integration of these insights will be critical for assessing ecological impacts of increasing killer whale predation pressure on Arctic-endemic species. |
format |
Article in Journal/Newspaper |
author |
Matthews, Cory J D Yarnes, Chris T Lefort, Kyle J Edkins, Tera L Kiszka, Jeremy J Ferguson, Steven H |
author_facet |
Matthews, Cory J D Yarnes, Chris T Lefort, Kyle J Edkins, Tera L Kiszka, Jeremy J Ferguson, Steven H |
author_sort |
Matthews, Cory J D |
title |
Dietary plasticity and broad North Atlantic origins inferred from bulk and amino acid-specific δ |
title_short |
Dietary plasticity and broad North Atlantic origins inferred from bulk and amino acid-specific δ |
title_full |
Dietary plasticity and broad North Atlantic origins inferred from bulk and amino acid-specific δ |
title_fullStr |
Dietary plasticity and broad North Atlantic origins inferred from bulk and amino acid-specific δ |
title_full_unstemmed |
Dietary plasticity and broad North Atlantic origins inferred from bulk and amino acid-specific δ |
title_sort |
dietary plasticity and broad north atlantic origins inferred from bulk and amino acid-specific δ |
publisher |
Wiley |
publishDate |
2024 |
url |
https://doi.org/10.1111/1365-2656.14123 https://pubmed.ncbi.nlm.nih.gov/38956826 |
geographic |
Arctic Baffin Island Canada Pacific |
geographic_facet |
Arctic Baffin Island Canada Pacific |
genre |
Arctic Baffin Island Baffin baleen whales Killer Whale North Atlantic Orca Orcinus orca Sea ice Killer whale |
genre_facet |
Arctic Baffin Island Baffin baleen whales Killer Whale North Atlantic Orca Orcinus orca Sea ice Killer whale |
op_source |
J Anim Ecol ISSN:1365-2656 |
op_relation |
https://doi.org/10.1111/1365-2656.14123 https://pubmed.ncbi.nlm.nih.gov/38956826 |
op_rights |
© 2024 The Author(s). Journal of Animal Ecology published by John Wiley & Sons Ltd on behalf of British Ecological Society. |
op_doi |
https://doi.org/10.1111/1365-2656.14123 |
container_title |
Journal of Animal Ecology |
container_volume |
93 |
container_issue |
8 |
container_start_page |
1049 |
op_container_end_page |
1064 |
_version_ |
1809760630751625216 |