Population structure and divergence time among East Greenland and West Greenland/Eastern Canadian Arctic narwhals, Monodon monoceros

The narwhal ( Monodon monoceros ) is an Arctic endemic odontocete that is particularly sensitive to climate change. Narwhals are also a key species in subsistence hunts in both Canada and Greenland. Understanding the genetic population structure is crucial to help management authorities set sustaina...

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Vydáno v:	Polar biology Ročník 48; číslo 4; s. 112
Hlavní autoři:	Lopes, Xênia M., Bérubé, Martine, Kovacs, Kit M., Dietz, Rune, Ferguson, Steven H., Heide-Jørgensen, Mads Peter, Lydersen, Christian, Palsbøll, Per J.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Berlin/Heidelberg Springer Berlin Heidelberg 01.12.2025 Springer Nature B.V
Témata:	Aquatic mammals Bar codes Biomedical and Life Sciences Carnivorous animals Climate change Clustering Confidence intervals Differentiation Divergence Dominant species Ecology Environmental changes Environmental effects Genomes Hunting Life Sciences Marine mammals Microbiology Mitochondrial DNA Monodon Monodon monoceros Nucleotides Oceanography Overexploitation Plant Sciences Population dynamics Population genetics Population statistics Population structure Quotas Single-nucleotide polymorphism Sustainable harvest Zoology Denmark Arctic region Greenland Monodon monoceros Climate change Divergence time Single-nucleotide polymorphisms Arctic marine mammals Monodontidae Population genetics
ISSN:	0722-4060, 1432-2056
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Abstract	The narwhal ( Monodon monoceros ) is an Arctic endemic odontocete that is particularly sensitive to climate change. Narwhals are also a key species in subsistence hunts in both Canada and Greenland. Understanding the genetic population structure is crucial to help management authorities set sustainable harvest quotas to avoid overexploitation of vulnerable narwhal groups. Additionally, estimates of population divergence times and their correlation with potential environmental drivers may be informative regarding the effects of environmental change. Herein, 2236 genome-wide single-nucleotide polymorphisms from 40 narwhals were used to infer population structure and divergence times. Samples were collected in six localities, one in East Greenland, four in West Greenland and one in the Eastern Canadian Arctic. The highest degree of genetic differentiation was observed between narwhals from Kangertittivaq (East Greenland) and Tasiujaq (Eastern Canadian Arctic), with a θ of 0.021 (95% confidence interval (CI): 0.014–0.028). While some locations in West Greenland also exhibited significant levels of differentiation (e.g., Uummannaq vs Qeqertarsuaq, θ = 0.011, 95% CI: 0.004–0.020), the East Greenland narwhals were most distinct based on both θ (varying from 0.01, 95% CI: 0–0.01 with Uummannaq to 0.021 95% CI: 0.014–0.028 with Tasiujaq) and clustering analyses. Our results are relevant to the management of narwhals in East Greenland, where current hunting levels are likely unsustainable. The divergence time estimated between East Greenland and West Greenland/Eastern Canadian Arctic suggests that narwhals in these two areas became separated during the Last Glacial Maximum, offering additional insight into the long-term population dynamics during climate change.
AbstractList	The narwhal ( Monodon monoceros ) is an Arctic endemic odontocete that is particularly sensitive to climate change. Narwhals are also a key species in subsistence hunts in both Canada and Greenland. Understanding the genetic population structure is crucial to help management authorities set sustainable harvest quotas to avoid overexploitation of vulnerable narwhal groups. Additionally, estimates of population divergence times and their correlation with potential environmental drivers may be informative regarding the effects of environmental change. Herein, 2236 genome-wide single-nucleotide polymorphisms from 40 narwhals were used to infer population structure and divergence times. Samples were collected in six localities, one in East Greenland, four in West Greenland and one in the Eastern Canadian Arctic. The highest degree of genetic differentiation was observed between narwhals from Kangertittivaq (East Greenland) and Tasiujaq (Eastern Canadian Arctic), with a θ of 0.021 (95% confidence interval (CI): 0.014–0.028). While some locations in West Greenland also exhibited significant levels of differentiation (e.g., Uummannaq vs Qeqertarsuaq, θ = 0.011, 95% CI: 0.004–0.020), the East Greenland narwhals were most distinct based on both θ (varying from 0.01, 95% CI: 0–0.01 with Uummannaq to 0.021 95% CI: 0.014–0.028 with Tasiujaq) and clustering analyses. Our results are relevant to the management of narwhals in East Greenland, where current hunting levels are likely unsustainable. The divergence time estimated between East Greenland and West Greenland/Eastern Canadian Arctic suggests that narwhals in these two areas became separated during the Last Glacial Maximum, offering additional insight into the long-term population dynamics during climate change. The narwhal (Monodon monoceros) is an Arctic endemic odontocete that is particularly sensitive to climate change. Narwhals are also a key species in subsistence hunts in both Canada and Greenland. Understanding the genetic population structure is crucial to help management authorities set sustainable harvest quotas to avoid overexploitation of vulnerable narwhal groups. Additionally, estimates of population divergence times and their correlation with potential environmental drivers may be informative regarding the effects of environmental change. Herein, 2236 genome-wide single-nucleotide polymorphisms from 40 narwhals were used to infer population structure and divergence times. Samples were collected in six localities, one in East Greenland, four in West Greenland and one in the Eastern Canadian Arctic. The highest degree of genetic differentiation was observed between narwhals from Kangertittivaq (East Greenland) and Tasiujaq (Eastern Canadian Arctic), with a θ of 0.021 (95% confidence interval (CI): 0.014–0.028). While some locations in West Greenland also exhibited significant levels of differentiation (e.g., Uummannaq vs Qeqertarsuaq, θ = 0.011, 95% CI: 0.004–0.020), the East Greenland narwhals were most distinct based on both θ (varying from 0.01, 95% CI: 0–0.01 with Uummannaq to 0.021 95% CI: 0.014–0.028 with Tasiujaq) and clustering analyses. Our results are relevant to the management of narwhals in East Greenland, where current hunting levels are likely unsustainable. The divergence time estimated between East Greenland and West Greenland/Eastern Canadian Arctic suggests that narwhals in these two areas became separated during the Last Glacial Maximum, offering additional insight into the long-term population dynamics during climate change. The narwhal ( Monodon monoceros ) is an Arctic endemic odontocete that is particularly sensitive to climate change. Narwhals are also a key species in subsistence hunts in both Canada and Greenland. Understanding the genetic population structure is crucial to help management authorities set sustainable harvest quotas to avoid overexploitation of vulnerable narwhal groups. Additionally, estimates of population divergence times and their correlation with potential environmental drivers may be informative regarding the effects of environmental change. Herein, 2236 genome-wide single-nucleotide polymorphisms from 40 narwhals were used to infer population structure and divergence times. Samples were collected in six localities, one in East Greenland, four in West Greenland and one in the Eastern Canadian Arctic. The highest degree of genetic differentiation was observed between narwhals from Kangertittivaq (East Greenland) and Tasiujaq (Eastern Canadian Arctic), with a θ of 0.021 (95% confidence interval (CI): 0.014–0.028). While some locations in West Greenland also exhibited significant levels of differentiation (e.g., Uummannaq vs Qeqertarsuaq, θ = 0.011, 95% CI: 0.004–0.020), the East Greenland narwhals were most distinct based on both θ (varying from 0.01, 95% CI: 0–0.01 with Uummannaq to 0.021 95% CI: 0.014–0.028 with Tasiujaq) and clustering analyses. Our results are relevant to the management of narwhals in East Greenland, where current hunting levels are likely unsustainable. The divergence time estimated between East Greenland and West Greenland/Eastern Canadian Arctic suggests that narwhals in these two areas became separated during the Last Glacial Maximum, offering additional insight into the long-term population dynamics during climate change.
ArticleNumber	112
Author	Bérubé, Martine Heide-Jørgensen, Mads Peter Kovacs, Kit M. Ferguson, Steven H. Lydersen, Christian Palsbøll, Per J. Dietz, Rune Lopes, Xênia M.
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Snippet	The narwhal ( Monodon monoceros ) is an Arctic endemic odontocete that is particularly sensitive to climate change. Narwhals are also a key species... The narwhal ( Monodon monoceros ) is an Arctic endemic odontocete that is particularly sensitive to climate change. Narwhals are also a key species... The narwhal (Monodon monoceros) is an Arctic endemic odontocete that is particularly sensitive to climate change. Narwhals are also a key species in...
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SubjectTerms	Aquatic mammals Bar codes Biomedical and Life Sciences Carnivorous animals Climate change Clustering Confidence intervals Differentiation Divergence Dominant species Ecology Environmental changes Environmental effects Genomes Hunting Life Sciences Marine mammals Microbiology Mitochondrial DNA Monodon Monodon monoceros Nucleotides Oceanography Overexploitation Plant Sciences Population dynamics Population genetics Population statistics Population structure Quotas Single-nucleotide polymorphism Sustainable harvest Zoology
Title	Population structure and divergence time among East Greenland and West Greenland/Eastern Canadian Arctic narwhals, Monodon monoceros
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