Distribution and Abundance of Cetaceans in Icelandic Waters over 30 Years of Aerial Surveys
Beginning in 1986, 7 aerial surveys covering the coastal waters of Iceland have been conducted up to 2016. In addition, several partial surveys covering portions of the same area and at different times of the year have been flown in the same 30 year time span. We present previously unpublished abund...
Published in: | NAMMCO Scientific Publications |
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Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Septentrio Academic Publishing
2020
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Subjects: | |
Online Access: | https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805 https://doi.org/10.7557/3.4805 |
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ftunitroemsoe:oai:ojs.henry.ub.uit.no:article/4805 |
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openpolar |
institution |
Open Polar |
collection |
University of Tromsø: Septentrio Academic Publishing |
op_collection_id |
ftunitroemsoe |
language |
English |
topic |
abundance Iceland aerial survey population trend common minke whale humpback whale white-beaked dolphin harbour porpoise |
spellingShingle |
abundance Iceland aerial survey population trend common minke whale humpback whale white-beaked dolphin harbour porpoise Pike, Daniel G. Gunnlaugsson, Thorvaldur Sigurjónsson, Jóhann Víkingsson, Gísli Distribution and Abundance of Cetaceans in Icelandic Waters over 30 Years of Aerial Surveys |
topic_facet |
abundance Iceland aerial survey population trend common minke whale humpback whale white-beaked dolphin harbour porpoise |
description |
Beginning in 1986, 7 aerial surveys covering the coastal waters of Iceland have been conducted up to 2016. In addition, several partial surveys covering portions of the same area and at different times of the year have been flown in the same 30 year time span. We present previously unpublished abundance estimates, corrected to the extent feasible for known biases, for common minke whales (Balaenoptera acutorostrata), humpback whales (Megaptera novaeangliae), white-beaked dolphins (Lagenorhynchus albirostris) and harbour porpoises (Phocoena phocoena) from some or all of the 2007, 2009 and 2016 surveys. The relative abundance of most species was comparatively low in the spring and fall, and peaked June and July when all of the main surveys have been carried out. An analysis of changes in line transect density as an index of relative abundance from all surveys indicates that common minke whale abundance decreased by 75% after 2001 and has remained at a relatively low level since then. Relative abundance of humpback whales and white-beaked dolphins has increased over the period 1986-2016. We place these observed changes in context with oceanographic and ecosystem changes documented over the same period. |
format |
Article in Journal/Newspaper |
author |
Pike, Daniel G. Gunnlaugsson, Thorvaldur Sigurjónsson, Jóhann Víkingsson, Gísli |
author_facet |
Pike, Daniel G. Gunnlaugsson, Thorvaldur Sigurjónsson, Jóhann Víkingsson, Gísli |
author_sort |
Pike, Daniel G. |
title |
Distribution and Abundance of Cetaceans in Icelandic Waters over 30 Years of Aerial Surveys |
title_short |
Distribution and Abundance of Cetaceans in Icelandic Waters over 30 Years of Aerial Surveys |
title_full |
Distribution and Abundance of Cetaceans in Icelandic Waters over 30 Years of Aerial Surveys |
title_fullStr |
Distribution and Abundance of Cetaceans in Icelandic Waters over 30 Years of Aerial Surveys |
title_full_unstemmed |
Distribution and Abundance of Cetaceans in Icelandic Waters over 30 Years of Aerial Surveys |
title_sort |
distribution and abundance of cetaceans in icelandic waters over 30 years of aerial surveys |
publisher |
Septentrio Academic Publishing |
publishDate |
2020 |
url |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805 https://doi.org/10.7557/3.4805 |
genre |
Balaenoptera acutorostrata Harbour porpoise Humpback Whale Iceland Lagenorhynchus albirostris Megaptera novaeangliae minke whale Phocoena phocoena White-beaked dolphin |
genre_facet |
Balaenoptera acutorostrata Harbour porpoise Humpback Whale Iceland Lagenorhynchus albirostris Megaptera novaeangliae minke whale Phocoena phocoena White-beaked dolphin |
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 |
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op_rights |
Copyright (c) 2020 Daniel Pike, Gisli Vikingsson, Thorvaldur Gunnlaugsson, Johann Sigurjonsson https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.7557/3.480510.7557/3.11 |
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NAMMCO Scientific Publications |
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11 |
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ftunitroemsoe:oai:ojs.henry.ub.uit.no:article/4805 2023-10-09T21:50:06+02:00 Distribution and Abundance of Cetaceans in Icelandic Waters over 30 Years of Aerial Surveys Pike, Daniel G. Gunnlaugsson, Thorvaldur Sigurjónsson, Jóhann Víkingsson, Gísli 2020-05-29 application/pdf image/tiff https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805 https://doi.org/10.7557/3.4805 eng eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5283 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5662 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5663 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5664 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5665 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5666 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5667 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5668 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5669 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5670 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5671 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5672 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5281 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5270 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5271 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5272 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5273 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5274 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5275 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5276 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5277 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5278 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5279 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805/5280 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/4805 doi:10.7557/3.4805 Copyright (c) 2020 Daniel Pike, Gisli Vikingsson, Thorvaldur Gunnlaugsson, Johann Sigurjonsson 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 abundance Iceland aerial survey population trend common minke whale humpback whale white-beaked dolphin harbour porpoise info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftunitroemsoe https://doi.org/10.7557/3.480510.7557/3.11 2023-09-20T23:07:55Z Beginning in 1986, 7 aerial surveys covering the coastal waters of Iceland have been conducted up to 2016. In addition, several partial surveys covering portions of the same area and at different times of the year have been flown in the same 30 year time span. We present previously unpublished abundance estimates, corrected to the extent feasible for known biases, for common minke whales (Balaenoptera acutorostrata), humpback whales (Megaptera novaeangliae), white-beaked dolphins (Lagenorhynchus albirostris) and harbour porpoises (Phocoena phocoena) from some or all of the 2007, 2009 and 2016 surveys. The relative abundance of most species was comparatively low in the spring and fall, and peaked June and July when all of the main surveys have been carried out. An analysis of changes in line transect density as an index of relative abundance from all surveys indicates that common minke whale abundance decreased by 75% after 2001 and has remained at a relatively low level since then. Relative abundance of humpback whales and white-beaked dolphins has increased over the period 1986-2016. We place these observed changes in context with oceanographic and ecosystem changes documented over the same period. Article in Journal/Newspaper Balaenoptera acutorostrata Harbour porpoise Humpback Whale Iceland Lagenorhynchus albirostris Megaptera novaeangliae minke whale Phocoena phocoena White-beaked dolphin University of Tromsø: Septentrio Academic Publishing NAMMCO Scientific Publications 11 |