Estimated Abundances of Cetacean Species in the Northeast Atlantic from Two Multiyear Surveys Conducted by Norwegian Vessels between 2002–2013
Two shipboard line-transect surveys of the Northeast Atlantic were conducted between 2002–2007 and 2008–2013 to meet the ongoing requirements of the Revised Management Procedure (RMP) for common minke whales (Balaenoptera acutorostrata acutorostrata) developed by the International Whaling Commission...
Published in: | NAMMCO Scientific Publications |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Septentrio Academic Publishing
2020
|
Subjects: | |
Online Access: | https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695 https://doi.org/10.7557/3.4695 |
id |
ftunitroemsoe:oai:ojs.henry.ub.uit.no:article/4695 |
---|---|
record_format |
openpolar |
spelling |
ftunitroemsoe:oai:ojs.henry.ub.uit.no:article/4695 2023-10-09T21:50:06+02:00 Estimated Abundances of Cetacean Species in the Northeast Atlantic from Two Multiyear Surveys Conducted by Norwegian Vessels between 2002–2013 Leonard, Deanna Øien, Nils 2020-07-15 application/pdf image/tiff image/jpeg https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695 https://doi.org/10.7557/3.4695 eng eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5327 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5745 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5746 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5747 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5748 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5749 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5750 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5751 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5752 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5753 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5754 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5755 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5756 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5757 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695 doi:10.7557/3.4695 Copyright (c) 2020 Deanna Leonard, Nils Øien https://creativecommons.org/licenses/by/4.0 NAMMCO Scientific Publications; Vol. 11 (2019): Sightings Surveys in the North Atlantic: 30 years of counting whales 2309-2491 1560-2206 10.7557/3.11 North Atlantic cetacean abundance line-transect fin whales humpback whales sperm whales killer whales harbour porpoises dolphins info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftunitroemsoe https://doi.org/10.7557/3.469510.7557/3.11 2023-09-20T23:07:55Z Two shipboard line-transect surveys of the Northeast Atlantic were conducted between 2002–2007 and 2008–2013 to meet the ongoing requirements of the Revised Management Procedure (RMP) for common minke whales (Balaenoptera acutorostrata acutorostrata) developed by the International Whaling Commission’s Scientific Committee. Here we present estimated abundances for non-target species for which there were sufficient sightings, including fin whales (Balaenoptera physalus), humpback whales (Megaptera novaeangliae), sperm whales (Physeter macrocephalus), killer whales (Orcinus orca), harbour porpoises (Phocoena phocoena), and dolphins of genus Lagenorhynchus. The 2 surveys were conducted using a multiyear mosaic survey design with 2 independent observer platforms operating in passing mode, each with 2 observers. The abundances of Lagenorhynchus spp. from the 2002–2007 survey were estimated using single-platform standard distance sampling methods because of uncertainty in identifying duplicate sightings. All other estimates were derived using mark-recapture distance sampling techniques applied to a combined-platform dataset of observations, correcting for perception bias. Most notably, we find that the abundance of humpback whales, similar in both survey periods, has doubled since the 1990s with the most striking changes occurring in the Barents Sea. We also show that the pattern in distribution and abundance of fin whales and sperm whales is consistent with our earlier surveys, and that abundances of small odontocete species, which were not estimated in earlier surveys, show stable distributions with some variation in their estimates. Our estimates do not account for distributional shifts between years or correct for biases due to availability or responsive movement. Article in Journal/Newspaper Balaenoptera acutorostrata Balaenoptera physalus Barents Sea Megaptera novaeangliae North Atlantic Northeast Atlantic Orca Orcinus orca Phocoena phocoena Physeter macrocephalus University of Tromsø: Septentrio Academic Publishing Barents Sea NAMMCO Scientific Publications 11 |
institution |
Open Polar |
collection |
University of Tromsø: Septentrio Academic Publishing |
op_collection_id |
ftunitroemsoe |
language |
English |
topic |
North Atlantic cetacean abundance line-transect fin whales humpback whales sperm whales killer whales harbour porpoises dolphins |
spellingShingle |
North Atlantic cetacean abundance line-transect fin whales humpback whales sperm whales killer whales harbour porpoises dolphins Leonard, Deanna Øien, Nils Estimated Abundances of Cetacean Species in the Northeast Atlantic from Two Multiyear Surveys Conducted by Norwegian Vessels between 2002–2013 |
topic_facet |
North Atlantic cetacean abundance line-transect fin whales humpback whales sperm whales killer whales harbour porpoises dolphins |
description |
Two shipboard line-transect surveys of the Northeast Atlantic were conducted between 2002–2007 and 2008–2013 to meet the ongoing requirements of the Revised Management Procedure (RMP) for common minke whales (Balaenoptera acutorostrata acutorostrata) developed by the International Whaling Commission’s Scientific Committee. Here we present estimated abundances for non-target species for which there were sufficient sightings, including fin whales (Balaenoptera physalus), humpback whales (Megaptera novaeangliae), sperm whales (Physeter macrocephalus), killer whales (Orcinus orca), harbour porpoises (Phocoena phocoena), and dolphins of genus Lagenorhynchus. The 2 surveys were conducted using a multiyear mosaic survey design with 2 independent observer platforms operating in passing mode, each with 2 observers. The abundances of Lagenorhynchus spp. from the 2002–2007 survey were estimated using single-platform standard distance sampling methods because of uncertainty in identifying duplicate sightings. All other estimates were derived using mark-recapture distance sampling techniques applied to a combined-platform dataset of observations, correcting for perception bias. Most notably, we find that the abundance of humpback whales, similar in both survey periods, has doubled since the 1990s with the most striking changes occurring in the Barents Sea. We also show that the pattern in distribution and abundance of fin whales and sperm whales is consistent with our earlier surveys, and that abundances of small odontocete species, which were not estimated in earlier surveys, show stable distributions with some variation in their estimates. Our estimates do not account for distributional shifts between years or correct for biases due to availability or responsive movement. |
format |
Article in Journal/Newspaper |
author |
Leonard, Deanna Øien, Nils |
author_facet |
Leonard, Deanna Øien, Nils |
author_sort |
Leonard, Deanna |
title |
Estimated Abundances of Cetacean Species in the Northeast Atlantic from Two Multiyear Surveys Conducted by Norwegian Vessels between 2002–2013 |
title_short |
Estimated Abundances of Cetacean Species in the Northeast Atlantic from Two Multiyear Surveys Conducted by Norwegian Vessels between 2002–2013 |
title_full |
Estimated Abundances of Cetacean Species in the Northeast Atlantic from Two Multiyear Surveys Conducted by Norwegian Vessels between 2002–2013 |
title_fullStr |
Estimated Abundances of Cetacean Species in the Northeast Atlantic from Two Multiyear Surveys Conducted by Norwegian Vessels between 2002–2013 |
title_full_unstemmed |
Estimated Abundances of Cetacean Species in the Northeast Atlantic from Two Multiyear Surveys Conducted by Norwegian Vessels between 2002–2013 |
title_sort |
estimated abundances of cetacean species in the northeast atlantic from two multiyear surveys conducted by norwegian vessels between 2002–2013 |
publisher |
Septentrio Academic Publishing |
publishDate |
2020 |
url |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695 https://doi.org/10.7557/3.4695 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Balaenoptera acutorostrata Balaenoptera physalus Barents Sea Megaptera novaeangliae North Atlantic Northeast Atlantic Orca Orcinus orca Phocoena phocoena Physeter macrocephalus |
genre_facet |
Balaenoptera acutorostrata Balaenoptera physalus Barents Sea Megaptera novaeangliae North Atlantic Northeast Atlantic Orca Orcinus orca Phocoena phocoena Physeter macrocephalus |
op_source |
NAMMCO Scientific Publications; Vol. 11 (2019): Sightings Surveys in the North Atlantic: 30 years of counting whales 2309-2491 1560-2206 10.7557/3.11 |
op_relation |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5327 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5745 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5746 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5747 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5748 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5749 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5750 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5751 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5752 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5753 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5754 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5755 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5756 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695/5757 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4695 doi:10.7557/3.4695 |
op_rights |
Copyright (c) 2020 Deanna Leonard, Nils Øien https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.7557/3.469510.7557/3.11 |
container_title |
NAMMCO Scientific Publications |
container_volume |
11 |
_version_ |
1779313164157976576 |