Distribution and abundance of fin whales (Balaenoptera physalus) in the Northeast and Central Atlantic as inferred from the North Atlantic Sightings Surveys 1987-2001
North Atlantic Sightings Surveys (NASS) is a series of large scale international cetacean line transect surveys, conducted in 1987, 1989, 1995 and 2001, that covered a large part of the central and eastern North Atlantic. Target species were fin (Balaenoptera physalus), common minke (B. acutorostrat...
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Online Access: | https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2705 https://doi.org/10.7557/3.2705 |
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ftunitroemsoe:oai:ojs.henry.ub.uit.no:article/2705 2023-05-15T15:36:33+02:00 Distribution and abundance of fin whales (Balaenoptera physalus) in the Northeast and Central Atlantic as inferred from the North Atlantic Sightings Surveys 1987-2001 Víkingsson, Gísli A Pike, Daniel G Desportes, Geneviève Øien, Nils Gunnlaugsson, Thorvaldur Bloch, Dorete 2013-10-22 application/pdf https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2705 https://doi.org/10.7557/3.2705 eng eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2705/2554 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2705 doi:10.7557/3.2705 Copyright (c) 2013 Gísli A Víkingsson, Daniel G Pike, Geneviève Desportes, Nils Øien, Thorvaldur Gunnlaugsson, Dorete Bloch http://creativecommons.org/licenses/by/3.0/ CC-BY NAMMCO Scientific Publications; Vol 7: North Atlantic Sightings Surveys: Counting whales in the North Atlantic, 1987-2001; 49-72 2309-2491 1560-2206 10.7557/3.7 distribution abundance fin whales Balaenoptera physalus North Atlantic surveys info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2013 ftunitroemsoe https://doi.org/10.7557/3.2705 https://doi.org/10.7557/3.7 2021-08-16T16:37:46Z North Atlantic Sightings Surveys (NASS) is a series of large scale international cetacean line transect surveys, conducted in 1987, 1989, 1995 and 2001, that covered a large part of the central and eastern North Atlantic. Target species were fin (Balaenoptera physalus), common minke (B. acutorostrata), pilot (Globicephala melas) and sei (B. borealis) whales. Here we present new estimates of abundance for fin whales from the 2 most recent surveys and analysis of trends throughout the survey period. Fin whales were found in highest densities in the Irminger Sea between Iceland and Greenland. Abundance of fin whales in the survey area of the Icelandic and Faroese vessels (Central North Atlantic) was estimated as 19,672 (95% C.I. 12,083-28,986) animals in 1995 and 24,887 (95% C.I. 18,186-30,214) in 2001. The estimates are negatively biased because of whales diving during the passage of vessels, and whales being missed by observers, but these and other potential biases are likely small for this species. The abundance of fin whales increased significantly over the survey period. For all areas combined the estimated annual growth rate was 4%. An estimated annual increase of 10% in the area between Iceland and Greenland was responsible for most of this overall increase in numbers of fin whales in the area. Although high, the estimated rates of increase are not out of bounds of biological plausibility and can thus be viewed as recovery of a depleted population. However, the apparent pattern of population growth and the whaling history in the area indicate that fin whales made a significant recovery during the first half of the 20th century and that the recent observed high growth rates cannot be explained solely by recovery after overexploitation. Article in Journal/Newspaper Balaenoptera physalus Greenland Iceland North Atlantic University of Tromsø: Septentrio Academic Publishing Greenland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) NAMMCO Scientific Publications 7 49 |
institution |
Open Polar |
collection |
University of Tromsø: Septentrio Academic Publishing |
op_collection_id |
ftunitroemsoe |
language |
English |
topic |
distribution abundance fin whales Balaenoptera physalus North Atlantic surveys |
spellingShingle |
distribution abundance fin whales Balaenoptera physalus North Atlantic surveys Víkingsson, Gísli A Pike, Daniel G Desportes, Geneviève Øien, Nils Gunnlaugsson, Thorvaldur Bloch, Dorete Distribution and abundance of fin whales (Balaenoptera physalus) in the Northeast and Central Atlantic as inferred from the North Atlantic Sightings Surveys 1987-2001 |
topic_facet |
distribution abundance fin whales Balaenoptera physalus North Atlantic surveys |
description |
North Atlantic Sightings Surveys (NASS) is a series of large scale international cetacean line transect surveys, conducted in 1987, 1989, 1995 and 2001, that covered a large part of the central and eastern North Atlantic. Target species were fin (Balaenoptera physalus), common minke (B. acutorostrata), pilot (Globicephala melas) and sei (B. borealis) whales. Here we present new estimates of abundance for fin whales from the 2 most recent surveys and analysis of trends throughout the survey period. Fin whales were found in highest densities in the Irminger Sea between Iceland and Greenland. Abundance of fin whales in the survey area of the Icelandic and Faroese vessels (Central North Atlantic) was estimated as 19,672 (95% C.I. 12,083-28,986) animals in 1995 and 24,887 (95% C.I. 18,186-30,214) in 2001. The estimates are negatively biased because of whales diving during the passage of vessels, and whales being missed by observers, but these and other potential biases are likely small for this species. The abundance of fin whales increased significantly over the survey period. For all areas combined the estimated annual growth rate was 4%. An estimated annual increase of 10% in the area between Iceland and Greenland was responsible for most of this overall increase in numbers of fin whales in the area. Although high, the estimated rates of increase are not out of bounds of biological plausibility and can thus be viewed as recovery of a depleted population. However, the apparent pattern of population growth and the whaling history in the area indicate that fin whales made a significant recovery during the first half of the 20th century and that the recent observed high growth rates cannot be explained solely by recovery after overexploitation. |
format |
Article in Journal/Newspaper |
author |
Víkingsson, Gísli A Pike, Daniel G Desportes, Geneviève Øien, Nils Gunnlaugsson, Thorvaldur Bloch, Dorete |
author_facet |
Víkingsson, Gísli A Pike, Daniel G Desportes, Geneviève Øien, Nils Gunnlaugsson, Thorvaldur Bloch, Dorete |
author_sort |
Víkingsson, Gísli A |
title |
Distribution and abundance of fin whales (Balaenoptera physalus) in the Northeast and Central Atlantic as inferred from the North Atlantic Sightings Surveys 1987-2001 |
title_short |
Distribution and abundance of fin whales (Balaenoptera physalus) in the Northeast and Central Atlantic as inferred from the North Atlantic Sightings Surveys 1987-2001 |
title_full |
Distribution and abundance of fin whales (Balaenoptera physalus) in the Northeast and Central Atlantic as inferred from the North Atlantic Sightings Surveys 1987-2001 |
title_fullStr |
Distribution and abundance of fin whales (Balaenoptera physalus) in the Northeast and Central Atlantic as inferred from the North Atlantic Sightings Surveys 1987-2001 |
title_full_unstemmed |
Distribution and abundance of fin whales (Balaenoptera physalus) in the Northeast and Central Atlantic as inferred from the North Atlantic Sightings Surveys 1987-2001 |
title_sort |
distribution and abundance of fin whales (balaenoptera physalus) in the northeast and central atlantic as inferred from the north atlantic sightings surveys 1987-2001 |
publisher |
Septentrio Academic Publishing |
publishDate |
2013 |
url |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2705 https://doi.org/10.7557/3.2705 |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Greenland Irminger Sea |
geographic_facet |
Greenland Irminger Sea |
genre |
Balaenoptera physalus Greenland Iceland North Atlantic |
genre_facet |
Balaenoptera physalus Greenland Iceland North Atlantic |
op_source |
NAMMCO Scientific Publications; Vol 7: North Atlantic Sightings Surveys: Counting whales in the North Atlantic, 1987-2001; 49-72 2309-2491 1560-2206 10.7557/3.7 |
op_relation |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2705/2554 https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2705 doi:10.7557/3.2705 |
op_rights |
Copyright (c) 2013 Gísli A Víkingsson, Daniel G Pike, Geneviève Desportes, Nils Øien, Thorvaldur Gunnlaugsson, Dorete Bloch http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.7557/3.2705 https://doi.org/10.7557/3.7 |
container_title |
NAMMCO Scientific Publications |
container_volume |
7 |
container_start_page |
49 |
_version_ |
1766366909474799616 |