Abundance and distribution of narwhals ( Monodon monoceros ) on the summering grounds in Greenland between 2007-2019
Narwhal abundance in West Greenland (WG) and East Greenland (EG) was estimated from aerial surveys conducted between 2007 and 2019 at their summer grounds. Analyses were completed using Mark Recapture Distance Sampling and Hidden Markov Line Transect Models taking account of the stochastic availabil...
Published in: | Frontiers in Marine Science |
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Language: | English |
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2024
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/abundance-and-distribution-of-narwhals-monodon-monoceros-on-the-summering-grounds-in-greenland-between-20072019(dc9ea006-dcab-4b14-9a81-a0f224687218).html https://doi.org/10.3389/fmars.2024.1294262 https://research-repository.st-andrews.ac.uk/bitstream/10023/29259/1/Hansen_2024_FMS_Abundance-distribution_CC.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/dc9ea006-dcab-4b14-9a81-a0f224687218 2024-05-12T08:00:21+00:00 Abundance and distribution of narwhals ( Monodon monoceros ) on the summering grounds in Greenland between 2007-2019 Hansen, R. G. Borchers, D. L. Heide-Jørgensen, M. P. 2024-01-31 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/abundance-and-distribution-of-narwhals-monodon-monoceros-on-the-summering-grounds-in-greenland-between-20072019(dc9ea006-dcab-4b14-9a81-a0f224687218).html https://doi.org/10.3389/fmars.2024.1294262 https://research-repository.st-andrews.ac.uk/bitstream/10023/29259/1/Hansen_2024_FMS_Abundance-distribution_CC.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/abundance-and-distribution-of-narwhals-monodon-monoceros-on-the-summering-grounds-in-greenland-between-20072019(dc9ea006-dcab-4b14-9a81-a0f224687218).html info:eu-repo/semantics/openAccess Hansen , R G , Borchers , D L & Heide-Jørgensen , M P 2024 , ' Abundance and distribution of narwhals ( Monodon monoceros ) on the summering grounds in Greenland between 2007-2019 ' , Frontiers in Marine Science , vol. 11 , 1294262 . https://doi.org/10.3389/fmars.2024.1294262 Aerial survey Hidden-Markov models Over-exploitation Narwhal Abundance Arctic article 2024 ftunstandrewcris https://doi.org/10.3389/fmars.2024.1294262 2024-04-16T02:39:21Z Narwhal abundance in West Greenland (WG) and East Greenland (EG) was estimated from aerial surveys conducted between 2007 and 2019 at their summer grounds. Analyses were completed using Mark Recapture Distance Sampling and Hidden Markov Line Transect Models taking account of the stochastic availability of diving whales. No statistically significant difference in abundance of narwhals could be detected for the two summer grounds (Melville Bay and Inglefield Bredning) in WG between 2007 and 2019. The distribution of narwhals in Inglefield Bredning was similar between years but in Melville Bay, area usage has decreased >80% since the first survey in 2007. Few detections of narwhals were obtained during the surveys in EG and a common detection function was fitted from combining sightings from seven surveys. Narwhals were found in small aggregations distributed between Nordostrundingen and south to and including Tasiilaq. Abundance of narwhals was estimated for the first time in the relatively unexplored Northeast Greenland (Dove Bay and a restricted coastal area of the Greenland Sea). The abundance in these two areas was 2908 narwhals (CV=0.30; 95% CI:1639-5168) estimated in 2017 for the Greenland Sea and 2297 (0.38; 1123-4745) and 1395 (0.33; 744-2641) narwhals were estimated for Dove Bay in 2017 and 2018, respectively. Both abundance and distribution range of narwhals in Southeast Greenland, where narwhals are subject to subsistence harvest, has decreased significantly between 2008-2017 and narwhals have even disappeared at the southernmost area since the first surveys in 2008. Article in Journal/Newspaper Arctic Dove bay East Greenland Greenland Greenland Sea Monodon monoceros narwhal* Nordostrundingen Tasiilaq University of St Andrews: Research Portal Arctic Greenland Tasiilaq ENVELOPE(-37.637,-37.637,65.615,65.615) Inglefield Bredning ENVELOPE(-67.804,-67.804,77.454,77.454) Nordostrundingen ENVELOPE(-12.133,-12.133,81.517,81.517) Frontiers in Marine Science 11 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Aerial survey Hidden-Markov models Over-exploitation Narwhal Abundance Arctic |
spellingShingle |
Aerial survey Hidden-Markov models Over-exploitation Narwhal Abundance Arctic Hansen, R. G. Borchers, D. L. Heide-Jørgensen, M. P. Abundance and distribution of narwhals ( Monodon monoceros ) on the summering grounds in Greenland between 2007-2019 |
topic_facet |
Aerial survey Hidden-Markov models Over-exploitation Narwhal Abundance Arctic |
description |
Narwhal abundance in West Greenland (WG) and East Greenland (EG) was estimated from aerial surveys conducted between 2007 and 2019 at their summer grounds. Analyses were completed using Mark Recapture Distance Sampling and Hidden Markov Line Transect Models taking account of the stochastic availability of diving whales. No statistically significant difference in abundance of narwhals could be detected for the two summer grounds (Melville Bay and Inglefield Bredning) in WG between 2007 and 2019. The distribution of narwhals in Inglefield Bredning was similar between years but in Melville Bay, area usage has decreased >80% since the first survey in 2007. Few detections of narwhals were obtained during the surveys in EG and a common detection function was fitted from combining sightings from seven surveys. Narwhals were found in small aggregations distributed between Nordostrundingen and south to and including Tasiilaq. Abundance of narwhals was estimated for the first time in the relatively unexplored Northeast Greenland (Dove Bay and a restricted coastal area of the Greenland Sea). The abundance in these two areas was 2908 narwhals (CV=0.30; 95% CI:1639-5168) estimated in 2017 for the Greenland Sea and 2297 (0.38; 1123-4745) and 1395 (0.33; 744-2641) narwhals were estimated for Dove Bay in 2017 and 2018, respectively. Both abundance and distribution range of narwhals in Southeast Greenland, where narwhals are subject to subsistence harvest, has decreased significantly between 2008-2017 and narwhals have even disappeared at the southernmost area since the first surveys in 2008. |
format |
Article in Journal/Newspaper |
author |
Hansen, R. G. Borchers, D. L. Heide-Jørgensen, M. P. |
author_facet |
Hansen, R. G. Borchers, D. L. Heide-Jørgensen, M. P. |
author_sort |
Hansen, R. G. |
title |
Abundance and distribution of narwhals ( Monodon monoceros ) on the summering grounds in Greenland between 2007-2019 |
title_short |
Abundance and distribution of narwhals ( Monodon monoceros ) on the summering grounds in Greenland between 2007-2019 |
title_full |
Abundance and distribution of narwhals ( Monodon monoceros ) on the summering grounds in Greenland between 2007-2019 |
title_fullStr |
Abundance and distribution of narwhals ( Monodon monoceros ) on the summering grounds in Greenland between 2007-2019 |
title_full_unstemmed |
Abundance and distribution of narwhals ( Monodon monoceros ) on the summering grounds in Greenland between 2007-2019 |
title_sort |
abundance and distribution of narwhals ( monodon monoceros ) on the summering grounds in greenland between 2007-2019 |
publishDate |
2024 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/abundance-and-distribution-of-narwhals-monodon-monoceros-on-the-summering-grounds-in-greenland-between-20072019(dc9ea006-dcab-4b14-9a81-a0f224687218).html https://doi.org/10.3389/fmars.2024.1294262 https://research-repository.st-andrews.ac.uk/bitstream/10023/29259/1/Hansen_2024_FMS_Abundance-distribution_CC.pdf |
long_lat |
ENVELOPE(-37.637,-37.637,65.615,65.615) ENVELOPE(-67.804,-67.804,77.454,77.454) ENVELOPE(-12.133,-12.133,81.517,81.517) |
geographic |
Arctic Greenland Tasiilaq Inglefield Bredning Nordostrundingen |
geographic_facet |
Arctic Greenland Tasiilaq Inglefield Bredning Nordostrundingen |
genre |
Arctic Dove bay East Greenland Greenland Greenland Sea Monodon monoceros narwhal* Nordostrundingen Tasiilaq |
genre_facet |
Arctic Dove bay East Greenland Greenland Greenland Sea Monodon monoceros narwhal* Nordostrundingen Tasiilaq |
op_source |
Hansen , R G , Borchers , D L & Heide-Jørgensen , M P 2024 , ' Abundance and distribution of narwhals ( Monodon monoceros ) on the summering grounds in Greenland between 2007-2019 ' , Frontiers in Marine Science , vol. 11 , 1294262 . https://doi.org/10.3389/fmars.2024.1294262 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/abundance-and-distribution-of-narwhals-monodon-monoceros-on-the-summering-grounds-in-greenland-between-20072019(dc9ea006-dcab-4b14-9a81-a0f224687218).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/fmars.2024.1294262 |
container_title |
Frontiers in Marine Science |
container_volume |
11 |
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