Estimates of large whale abundance in West Greenland waters from an aerial survey in 2005
An aerial line transect and cue counting survey of large whales in West Greenland was conducted in August and September 2005. The survey covered the area between Cape Farewell and Disko Island on the West Greenland coast out to the 200m depth contour. The surveyed area covered 163,574km 2 and a tota...
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Language: | English |
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2008
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/estimates-of-large-whale-abundance-in-west-greenland-waters-from-an-aerial-survey-in-2005(a6a70c87-e821-4f96-ad54-4d89851de419).html http://www.scopus.com/inward/record.url?scp=67649516185&partnerID=8YFLogxK |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/a6a70c87-e821-4f96-ad54-4d89851de419 2023-05-15T15:36:43+02:00 Estimates of large whale abundance in West Greenland waters from an aerial survey in 2005 Heide-Jørgensen, M. P. Borchers, D. L. Witting, L. Laidre, K. L. Simon, M. J. Rosing-Asvid, A. Pike, D. G. 2008-09-01 https://risweb.st-andrews.ac.uk/portal/en/researchoutput/estimates-of-large-whale-abundance-in-west-greenland-waters-from-an-aerial-survey-in-2005(a6a70c87-e821-4f96-ad54-4d89851de419).html http://www.scopus.com/inward/record.url?scp=67649516185&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Heide-Jørgensen , M P , Borchers , D L , Witting , L , Laidre , K L , Simon , M J , Rosing-Asvid , A & Pike , D G 2008 , ' Estimates of large whale abundance in West Greenland waters from an aerial survey in 2005 ' , Journal of Cetacean Research and Management , vol. 10 , no. 2 , pp. 119-129 . Abundance estimate Common minke whale Cue counting Distribution Fin whale g(0) Humpback whale Northern hemisphere School size Survey-Aerial Survey-Vessel article 2008 ftunstandrewcris 2022-06-02T07:49:18Z An aerial line transect and cue counting survey of large whales in West Greenland was conducted in August and September 2005. The survey covered the area between Cape Farewell and Disko Island on the West Greenland coast out to the 200m depth contour. The surveyed area covered 163,574km 2 and a total of 246 sightings of 9 cetacean species were obtained. Abundance estimates were developed for humpback whales, Megaptera novaeangliae (21 sightings), fin whales, Balaenoptera physalus (78 sightings) and common minke whales, B. acutorostrata (42 sightings). The mean group size of humpback whales was 3.30 but groups as large as 95 animals were seen off effort. The mean group size of fin whales was 2.96 with groups as large as 50 seen. Common minke whale group size was 1.1 with only one sighting of a group of two whales. Humpback whales were found both in offshore and coastal areas of West Greenland with the exception of Store Hellefiske Bank and the Cape Farewell offshore area. The line transect abundance estimate of humpback whales was 1, 218 (CV=0.56), uncorrected for submerged whales (availability bias) and whales that were available to be seen but were missed by the observers (perception bias). Fin whales were observed in all areas of the survey and the uncorrected line transect estimate was 1, 660 (CV=0.38). When corrected for perception bias the estimates increases to 3,234 fin whales (CV=0.44). Common minke whales were found in almost equal densities in all strata except for the Cape Farewell offshore area, where none were seen. The cue-counting abundance estimate of common minke whales was 4, 856 (CV=0.49) for West Greenland using a cue rate of 46.3 cues per hour (CV=0.11). If the estimate is corrected for perception bias the common minke whale abundance is estimated to be 10,792 whales (CV=0.59). Low coverage was attained in the northern area of West Greenland and this should cause an especially large negative bias for the estimates of fin whale and humpback whale abundance because this area is believed to ... Article in Journal/Newspaper Balaenoptera physalus Cape Farewell Fin whale Greenland Humpback Whale Megaptera novaeangliae minke whale University of St Andrews: Research Portal Greenland Store Hellefiske Bank ENVELOPE(-55.000,-55.000,67.500,67.500) |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Abundance estimate Common minke whale Cue counting Distribution Fin whale g(0) Humpback whale Northern hemisphere School size Survey-Aerial Survey-Vessel |
spellingShingle |
Abundance estimate Common minke whale Cue counting Distribution Fin whale g(0) Humpback whale Northern hemisphere School size Survey-Aerial Survey-Vessel Heide-Jørgensen, M. P. Borchers, D. L. Witting, L. Laidre, K. L. Simon, M. J. Rosing-Asvid, A. Pike, D. G. Estimates of large whale abundance in West Greenland waters from an aerial survey in 2005 |
topic_facet |
Abundance estimate Common minke whale Cue counting Distribution Fin whale g(0) Humpback whale Northern hemisphere School size Survey-Aerial Survey-Vessel |
description |
An aerial line transect and cue counting survey of large whales in West Greenland was conducted in August and September 2005. The survey covered the area between Cape Farewell and Disko Island on the West Greenland coast out to the 200m depth contour. The surveyed area covered 163,574km 2 and a total of 246 sightings of 9 cetacean species were obtained. Abundance estimates were developed for humpback whales, Megaptera novaeangliae (21 sightings), fin whales, Balaenoptera physalus (78 sightings) and common minke whales, B. acutorostrata (42 sightings). The mean group size of humpback whales was 3.30 but groups as large as 95 animals were seen off effort. The mean group size of fin whales was 2.96 with groups as large as 50 seen. Common minke whale group size was 1.1 with only one sighting of a group of two whales. Humpback whales were found both in offshore and coastal areas of West Greenland with the exception of Store Hellefiske Bank and the Cape Farewell offshore area. The line transect abundance estimate of humpback whales was 1, 218 (CV=0.56), uncorrected for submerged whales (availability bias) and whales that were available to be seen but were missed by the observers (perception bias). Fin whales were observed in all areas of the survey and the uncorrected line transect estimate was 1, 660 (CV=0.38). When corrected for perception bias the estimates increases to 3,234 fin whales (CV=0.44). Common minke whales were found in almost equal densities in all strata except for the Cape Farewell offshore area, where none were seen. The cue-counting abundance estimate of common minke whales was 4, 856 (CV=0.49) for West Greenland using a cue rate of 46.3 cues per hour (CV=0.11). If the estimate is corrected for perception bias the common minke whale abundance is estimated to be 10,792 whales (CV=0.59). Low coverage was attained in the northern area of West Greenland and this should cause an especially large negative bias for the estimates of fin whale and humpback whale abundance because this area is believed to ... |
format |
Article in Journal/Newspaper |
author |
Heide-Jørgensen, M. P. Borchers, D. L. Witting, L. Laidre, K. L. Simon, M. J. Rosing-Asvid, A. Pike, D. G. |
author_facet |
Heide-Jørgensen, M. P. Borchers, D. L. Witting, L. Laidre, K. L. Simon, M. J. Rosing-Asvid, A. Pike, D. G. |
author_sort |
Heide-Jørgensen, M. P. |
title |
Estimates of large whale abundance in West Greenland waters from an aerial survey in 2005 |
title_short |
Estimates of large whale abundance in West Greenland waters from an aerial survey in 2005 |
title_full |
Estimates of large whale abundance in West Greenland waters from an aerial survey in 2005 |
title_fullStr |
Estimates of large whale abundance in West Greenland waters from an aerial survey in 2005 |
title_full_unstemmed |
Estimates of large whale abundance in West Greenland waters from an aerial survey in 2005 |
title_sort |
estimates of large whale abundance in west greenland waters from an aerial survey in 2005 |
publishDate |
2008 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/estimates-of-large-whale-abundance-in-west-greenland-waters-from-an-aerial-survey-in-2005(a6a70c87-e821-4f96-ad54-4d89851de419).html http://www.scopus.com/inward/record.url?scp=67649516185&partnerID=8YFLogxK |
long_lat |
ENVELOPE(-55.000,-55.000,67.500,67.500) |
geographic |
Greenland Store Hellefiske Bank |
geographic_facet |
Greenland Store Hellefiske Bank |
genre |
Balaenoptera physalus Cape Farewell Fin whale Greenland Humpback Whale Megaptera novaeangliae minke whale |
genre_facet |
Balaenoptera physalus Cape Farewell Fin whale Greenland Humpback Whale Megaptera novaeangliae minke whale |
op_source |
Heide-Jørgensen , M P , Borchers , D L , Witting , L , Laidre , K L , Simon , M J , Rosing-Asvid , A & Pike , D G 2008 , ' Estimates of large whale abundance in West Greenland waters from an aerial survey in 2005 ' , Journal of Cetacean Research and Management , vol. 10 , no. 2 , pp. 119-129 . |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1766367087424438272 |