Estimated abundances of cetacean species in the Northeast Atlantic from Norwegian shipboard surveys conducted in 2014-2018
A ship-based mosaic survey of Northeast Atlantic cetaceans was conducted over a 5-year period between 2014–2018. The area surveyed extends from the North Sea in the south (southern boundary at 53oN), to the ice edge of the Barents Sea and the Greenland Sea. Survey vessels were equipped with 2 indepe...
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Online Access: | https://hdl.handle.net/11250/2725758 https://doi.org/10.7557/3.4694 |
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ftimr:oai:imr.brage.unit.no:11250/2725758 2023-05-15T15:36:11+02:00 Estimated abundances of cetacean species in the Northeast Atlantic from Norwegian shipboard surveys conducted in 2014-2018 Leonard, Deanna Marie Øien, Nils Inge 2020 application/pdf https://hdl.handle.net/11250/2725758 https://doi.org/10.7557/3.4694 eng eng urn:issn:1560-2206 https://hdl.handle.net/11250/2725758 https://doi.org/10.7557/3.4694 cristin:1859213 NAMMCO scientific publications Peer reviewed Journal article 2020 ftimr https://doi.org/10.7557/3.4694 2021-09-23T20:16:09Z A ship-based mosaic survey of Northeast Atlantic cetaceans was conducted over a 5-year period between 2014–2018. The area surveyed extends from the North Sea in the south (southern boundary at 53oN), to the ice edge of the Barents Sea and the Greenland Sea. Survey vessels were equipped with 2 independent observer platforms that detected whales in passing mode and applied tracking procedures for the target species, common minke whales (Balaenoptera acutorostrata acutorostrata). Here we present abundance estimates for all non-target species for which there were sufficient sightings. We estimate the abundance of fin whales (Balaenoptera physalus) to be 11,387 (CV=0.17, 95% CI: 8,072–16,063), of humpback whales (Megaptera novaeangliae) to be 10,708 (CV=0.38, 95% CI: 4,906–23,370), of sperm whales (Physeter macrocephalus) to be 5,704 (CV=0.26, 95% CI: 3,374–9,643), of killer whales (Orcinus orca) to be 15,056 (CV=0.29, 95% CI: 8,423–26,914), of harbour porpoises (Phocoena phocoena) to be 255,929 (CV=0.20, 95% CI: 172,742–379,175), dolphins of genus Lagenorhynchus to be 192,767 (CV=0.25, 95% CI: 114,033–325,863), and finally of northern bottlenose whales (Hyperoodon ampullatus) to be 7,800 (CV=0.28, 95% CI: 4,373–13,913). Additionally, our survey effort in the Norwegian Sea in 2015 contributed to the 6th North Atlantic Sightings Survey (NASS) and the survey was extended into the waters north and east of Iceland around Jan Mayen island. This NASS extension, along with our Norwegian Sea survey in 2015, was used to estimate the abundance of fin whales, humpback whales, and sperm whales. All estimates presented used mark-recapture distance sampling techniques and were thus corrected for perception bias. Our estimates do not account for additional variance due to distributional shifts between years or biases due to availability or responsive movement. publishedVersion Article in Journal/Newspaper Balaenoptera acutorostrata Balaenoptera physalus Barents Sea Greenland Greenland Sea hyperoodon ampullatus Iceland Jan Mayen Jan Mayen Island Megaptera novaeangliae North Atlantic Northeast Atlantic Norwegian Sea Orca Orcinus orca Phocoena phocoena Physeter macrocephalus Institute for Marine Research: Brage IMR Barents Sea Greenland Jan Mayen Norwegian Sea NAMMCO Scientific Publications 11 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
description |
A ship-based mosaic survey of Northeast Atlantic cetaceans was conducted over a 5-year period between 2014–2018. The area surveyed extends from the North Sea in the south (southern boundary at 53oN), to the ice edge of the Barents Sea and the Greenland Sea. Survey vessels were equipped with 2 independent observer platforms that detected whales in passing mode and applied tracking procedures for the target species, common minke whales (Balaenoptera acutorostrata acutorostrata). Here we present abundance estimates for all non-target species for which there were sufficient sightings. We estimate the abundance of fin whales (Balaenoptera physalus) to be 11,387 (CV=0.17, 95% CI: 8,072–16,063), of humpback whales (Megaptera novaeangliae) to be 10,708 (CV=0.38, 95% CI: 4,906–23,370), of sperm whales (Physeter macrocephalus) to be 5,704 (CV=0.26, 95% CI: 3,374–9,643), of killer whales (Orcinus orca) to be 15,056 (CV=0.29, 95% CI: 8,423–26,914), of harbour porpoises (Phocoena phocoena) to be 255,929 (CV=0.20, 95% CI: 172,742–379,175), dolphins of genus Lagenorhynchus to be 192,767 (CV=0.25, 95% CI: 114,033–325,863), and finally of northern bottlenose whales (Hyperoodon ampullatus) to be 7,800 (CV=0.28, 95% CI: 4,373–13,913). Additionally, our survey effort in the Norwegian Sea in 2015 contributed to the 6th North Atlantic Sightings Survey (NASS) and the survey was extended into the waters north and east of Iceland around Jan Mayen island. This NASS extension, along with our Norwegian Sea survey in 2015, was used to estimate the abundance of fin whales, humpback whales, and sperm whales. All estimates presented used mark-recapture distance sampling techniques and were thus corrected for perception bias. Our estimates do not account for additional variance due to distributional shifts between years or biases due to availability or responsive movement. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Leonard, Deanna Marie Øien, Nils Inge |
spellingShingle |
Leonard, Deanna Marie Øien, Nils Inge Estimated abundances of cetacean species in the Northeast Atlantic from Norwegian shipboard surveys conducted in 2014-2018 |
author_facet |
Leonard, Deanna Marie Øien, Nils Inge |
author_sort |
Leonard, Deanna Marie |
title |
Estimated abundances of cetacean species in the Northeast Atlantic from Norwegian shipboard surveys conducted in 2014-2018 |
title_short |
Estimated abundances of cetacean species in the Northeast Atlantic from Norwegian shipboard surveys conducted in 2014-2018 |
title_full |
Estimated abundances of cetacean species in the Northeast Atlantic from Norwegian shipboard surveys conducted in 2014-2018 |
title_fullStr |
Estimated abundances of cetacean species in the Northeast Atlantic from Norwegian shipboard surveys conducted in 2014-2018 |
title_full_unstemmed |
Estimated abundances of cetacean species in the Northeast Atlantic from Norwegian shipboard surveys conducted in 2014-2018 |
title_sort |
estimated abundances of cetacean species in the northeast atlantic from norwegian shipboard surveys conducted in 2014-2018 |
publishDate |
2020 |
url |
https://hdl.handle.net/11250/2725758 https://doi.org/10.7557/3.4694 |
geographic |
Barents Sea Greenland Jan Mayen Norwegian Sea |
geographic_facet |
Barents Sea Greenland Jan Mayen Norwegian Sea |
genre |
Balaenoptera acutorostrata Balaenoptera physalus Barents Sea Greenland Greenland Sea hyperoodon ampullatus Iceland Jan Mayen Jan Mayen Island Megaptera novaeangliae North Atlantic Northeast Atlantic Norwegian Sea Orca Orcinus orca Phocoena phocoena Physeter macrocephalus |
genre_facet |
Balaenoptera acutorostrata Balaenoptera physalus Barents Sea Greenland Greenland Sea hyperoodon ampullatus Iceland Jan Mayen Jan Mayen Island Megaptera novaeangliae North Atlantic Northeast Atlantic Norwegian Sea Orca Orcinus orca Phocoena phocoena Physeter macrocephalus |
op_source |
NAMMCO scientific publications |
op_relation |
urn:issn:1560-2206 https://hdl.handle.net/11250/2725758 https://doi.org/10.7557/3.4694 cristin:1859213 |
op_doi |
https://doi.org/10.7557/3.4694 |
container_title |
NAMMCO Scientific Publications |
container_volume |
11 |
_version_ |
1766366514995265536 |