Combined line-transect and cue-count estimate of sperm whale abundance in the North Atlantic, from Icelandic NASS-2001 shipboard survey
Sperm whales (Physeter macrocephalus) pose a particular problem to shipboard surveys as they dive for extended periods and are therefore likely to be missed (not available) even if they are right under the track line. To address these problems the NAMMCO planning committee for the NASS 2001 survey d...
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Septentrio Academic Publishing
2009
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Online Access: | https://doi.org/10.7557/3.2706 https://doaj.org/article/99a23ca2f0ae426faec2432551e83464 |
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ftdoajarticles:oai:doaj.org/article:99a23ca2f0ae426faec2432551e83464 2023-05-15T17:33:28+02:00 Combined line-transect and cue-count estimate of sperm whale abundance in the North Atlantic, from Icelandic NASS-2001 shipboard survey Thorvaldur Gunnlaugsson Gisli A Víkingsson Daniel G Pike 2009-09-01T00:00:00Z https://doi.org/10.7557/3.2706 https://doaj.org/article/99a23ca2f0ae426faec2432551e83464 EN eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2706 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2706 https://doaj.org/article/99a23ca2f0ae426faec2432551e83464 NAMMCO Scientific Publications, Vol 7, Iss 0, Pp 73-80 (2009) surveys sperm whales Physeter macrocephalus line-transect cue dive behaviour Ecology QH540-549.5 article 2009 ftdoajarticles https://doi.org/10.7557/3.2706 2022-12-30T22:14:40Z Sperm whales (Physeter macrocephalus) pose a particular problem to shipboard surveys as they dive for extended periods and are therefore likely to be missed (not available) even if they are right under the track line. To address these problems the NAMMCO planning committee for the NASS 2001 survey drew up guidelines to be followed when sperm whales were sighted. This required every deep dive to be recorded and considered to be a cue, from which a cue-count estimate is calculated if the cue rate is known. For those whales that did not dive before coming abeam, a conventional line-transect estimate is calculated, which gives an instantaneous surface estimate from which a total estimate can be obtained if the proportion of the time spent at the surface is known. These estimates are compared and combined. Precise dive cycle information is missing for the mostly single all male sperm whales in this area but a preliminary estimate of 11,185 (cv 0.34) is obtained for the surveyed area with an assumed surface time of 20% and two deep dives per hour. Article in Journal/Newspaper North Atlantic Physeter macrocephalus Sperm whale Directory of Open Access Journals: DOAJ Articles NAMMCO Scientific Publications 7 73 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
surveys sperm whales Physeter macrocephalus line-transect cue dive behaviour Ecology QH540-549.5 |
spellingShingle |
surveys sperm whales Physeter macrocephalus line-transect cue dive behaviour Ecology QH540-549.5 Thorvaldur Gunnlaugsson Gisli A Víkingsson Daniel G Pike Combined line-transect and cue-count estimate of sperm whale abundance in the North Atlantic, from Icelandic NASS-2001 shipboard survey |
topic_facet |
surveys sperm whales Physeter macrocephalus line-transect cue dive behaviour Ecology QH540-549.5 |
description |
Sperm whales (Physeter macrocephalus) pose a particular problem to shipboard surveys as they dive for extended periods and are therefore likely to be missed (not available) even if they are right under the track line. To address these problems the NAMMCO planning committee for the NASS 2001 survey drew up guidelines to be followed when sperm whales were sighted. This required every deep dive to be recorded and considered to be a cue, from which a cue-count estimate is calculated if the cue rate is known. For those whales that did not dive before coming abeam, a conventional line-transect estimate is calculated, which gives an instantaneous surface estimate from which a total estimate can be obtained if the proportion of the time spent at the surface is known. These estimates are compared and combined. Precise dive cycle information is missing for the mostly single all male sperm whales in this area but a preliminary estimate of 11,185 (cv 0.34) is obtained for the surveyed area with an assumed surface time of 20% and two deep dives per hour. |
format |
Article in Journal/Newspaper |
author |
Thorvaldur Gunnlaugsson Gisli A Víkingsson Daniel G Pike |
author_facet |
Thorvaldur Gunnlaugsson Gisli A Víkingsson Daniel G Pike |
author_sort |
Thorvaldur Gunnlaugsson |
title |
Combined line-transect and cue-count estimate of sperm whale abundance in the North Atlantic, from Icelandic NASS-2001 shipboard survey |
title_short |
Combined line-transect and cue-count estimate of sperm whale abundance in the North Atlantic, from Icelandic NASS-2001 shipboard survey |
title_full |
Combined line-transect and cue-count estimate of sperm whale abundance in the North Atlantic, from Icelandic NASS-2001 shipboard survey |
title_fullStr |
Combined line-transect and cue-count estimate of sperm whale abundance in the North Atlantic, from Icelandic NASS-2001 shipboard survey |
title_full_unstemmed |
Combined line-transect and cue-count estimate of sperm whale abundance in the North Atlantic, from Icelandic NASS-2001 shipboard survey |
title_sort |
combined line-transect and cue-count estimate of sperm whale abundance in the north atlantic, from icelandic nass-2001 shipboard survey |
publisher |
Septentrio Academic Publishing |
publishDate |
2009 |
url |
https://doi.org/10.7557/3.2706 https://doaj.org/article/99a23ca2f0ae426faec2432551e83464 |
genre |
North Atlantic Physeter macrocephalus Sperm whale |
genre_facet |
North Atlantic Physeter macrocephalus Sperm whale |
op_source |
NAMMCO Scientific Publications, Vol 7, Iss 0, Pp 73-80 (2009) |
op_relation |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2706 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2706 https://doaj.org/article/99a23ca2f0ae426faec2432551e83464 |
op_doi |
https://doi.org/10.7557/3.2706 |
container_title |
NAMMCO Scientific Publications |
container_volume |
7 |
container_start_page |
73 |
_version_ |
1766131988338573312 |