Discriminating Canadian Arctic beluga management stocks using dentine oxygen and carbon isotopes
In the eastern Canadian Arctic, belugas Delphinapterus leucas exhibit genetic and ecological differentiation across their distribution that forms the basis of management stocks for traditional Inuit hunts. Using oxygen and stable carbon isotope ratios in dentine phosphate (δ18OP) and structural carb...
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ftdoajarticles:oai:doaj.org/article:34876c5a0b3043a8aed29c888697a115 2024-09-15T17:57:00+00:00 Discriminating Canadian Arctic beluga management stocks using dentine oxygen and carbon isotopes CJD Matthews FJ Longstaffe GJ Parent CA Hornby CA Watt 2024-05-01T00:00:00Z https://doi.org/10.3354/esr01333 https://doaj.org/article/34876c5a0b3043a8aed29c888697a115 EN eng Inter-Research https://www.int-res.com/abstracts/esr/v54/p93-104/ https://doaj.org/toc/1863-5407 https://doaj.org/toc/1613-4796 1863-5407 1613-4796 doi:10.3354/esr01333 https://doaj.org/article/34876c5a0b3043a8aed29c888697a115 Endangered Species Research, Vol 54, Pp 93-104 (2024) Zoology QL1-991 Botany QK1-989 article 2024 ftdoajarticles https://doi.org/10.3354/esr01333 2024-08-05T17:49:10Z In the eastern Canadian Arctic, belugas Delphinapterus leucas exhibit genetic and ecological differentiation across their distribution that forms the basis of management stocks for traditional Inuit hunts. Using oxygen and stable carbon isotope ratios in dentine phosphate (δ18OP) and structural carbonate (δ13CSC), respectively, we evaluated the spatial structure of 3 of these beluga stocks: Western Hudson Bay (WHB, n = 30), Cumberland Sound (CS, n = 44), and Eastern High Arctic-Baffin Bay (EHA-BB, n = 29). Pairwise comparisons revealed significant differences in δ18OP and Suess-adjusted δ13CSC among all stocks, with the exception of similar δ18OP between the WHB and CS stocks. A linear discriminant analysis (LDA) model fit to 60% of the data set (training data) successfully classified 84% of the remaining belugas (test data) to their respective stocks based on hunt location. Isotopic overlap among stocks could reflect (1) homogeneous baseline stable isotope (SI) composition between geographically adjacent stocks, (2) some degree of marginal geographic overlap in ranges or individual movements among stocks, perhaps during late spring, or (3) confounding dietary influences that increased within-stock SI variation. Some misclassifications consistent with individual movements among stocks were supported by limited genetic data, with a small number of belugas hunted from the CS stock exhibiting both isotopic and genetic similarity to WHB belugas. Geographic stock differentiation inferred from oxygen and carbon isotope proxies largely corroborates current eastern Canadian Arctic beluga stock definitions, which is relevant not only for management purposes but also for monitoring changing beluga distributions in response to ongoing climate-driven changes in Arctic marine ecosystems. Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin Beluga Beluga* Cumberland Sound Delphinapterus leucas Hudson Bay inuit Directory of Open Access Journals: DOAJ Articles Endangered Species Research 54 93 104 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Zoology QL1-991 Botany QK1-989 |
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Zoology QL1-991 Botany QK1-989 CJD Matthews FJ Longstaffe GJ Parent CA Hornby CA Watt Discriminating Canadian Arctic beluga management stocks using dentine oxygen and carbon isotopes |
topic_facet |
Zoology QL1-991 Botany QK1-989 |
description |
In the eastern Canadian Arctic, belugas Delphinapterus leucas exhibit genetic and ecological differentiation across their distribution that forms the basis of management stocks for traditional Inuit hunts. Using oxygen and stable carbon isotope ratios in dentine phosphate (δ18OP) and structural carbonate (δ13CSC), respectively, we evaluated the spatial structure of 3 of these beluga stocks: Western Hudson Bay (WHB, n = 30), Cumberland Sound (CS, n = 44), and Eastern High Arctic-Baffin Bay (EHA-BB, n = 29). Pairwise comparisons revealed significant differences in δ18OP and Suess-adjusted δ13CSC among all stocks, with the exception of similar δ18OP between the WHB and CS stocks. A linear discriminant analysis (LDA) model fit to 60% of the data set (training data) successfully classified 84% of the remaining belugas (test data) to their respective stocks based on hunt location. Isotopic overlap among stocks could reflect (1) homogeneous baseline stable isotope (SI) composition between geographically adjacent stocks, (2) some degree of marginal geographic overlap in ranges or individual movements among stocks, perhaps during late spring, or (3) confounding dietary influences that increased within-stock SI variation. Some misclassifications consistent with individual movements among stocks were supported by limited genetic data, with a small number of belugas hunted from the CS stock exhibiting both isotopic and genetic similarity to WHB belugas. Geographic stock differentiation inferred from oxygen and carbon isotope proxies largely corroborates current eastern Canadian Arctic beluga stock definitions, which is relevant not only for management purposes but also for monitoring changing beluga distributions in response to ongoing climate-driven changes in Arctic marine ecosystems. |
format |
Article in Journal/Newspaper |
author |
CJD Matthews FJ Longstaffe GJ Parent CA Hornby CA Watt |
author_facet |
CJD Matthews FJ Longstaffe GJ Parent CA Hornby CA Watt |
author_sort |
CJD Matthews |
title |
Discriminating Canadian Arctic beluga management stocks using dentine oxygen and carbon isotopes |
title_short |
Discriminating Canadian Arctic beluga management stocks using dentine oxygen and carbon isotopes |
title_full |
Discriminating Canadian Arctic beluga management stocks using dentine oxygen and carbon isotopes |
title_fullStr |
Discriminating Canadian Arctic beluga management stocks using dentine oxygen and carbon isotopes |
title_full_unstemmed |
Discriminating Canadian Arctic beluga management stocks using dentine oxygen and carbon isotopes |
title_sort |
discriminating canadian arctic beluga management stocks using dentine oxygen and carbon isotopes |
publisher |
Inter-Research |
publishDate |
2024 |
url |
https://doi.org/10.3354/esr01333 https://doaj.org/article/34876c5a0b3043a8aed29c888697a115 |
genre |
Baffin Bay Baffin Bay Baffin Beluga Beluga* Cumberland Sound Delphinapterus leucas Hudson Bay inuit |
genre_facet |
Baffin Bay Baffin Bay Baffin Beluga Beluga* Cumberland Sound Delphinapterus leucas Hudson Bay inuit |
op_source |
Endangered Species Research, Vol 54, Pp 93-104 (2024) |
op_relation |
https://www.int-res.com/abstracts/esr/v54/p93-104/ https://doaj.org/toc/1863-5407 https://doaj.org/toc/1613-4796 1863-5407 1613-4796 doi:10.3354/esr01333 https://doaj.org/article/34876c5a0b3043a8aed29c888697a115 |
op_doi |
https://doi.org/10.3354/esr01333 |
container_title |
Endangered Species Research |
container_volume |
54 |
container_start_page |
93 |
op_container_end_page |
104 |
_version_ |
1810433203595378688 |