Distribution and abundance of West Greenland humpback whales ( Megaptera novaeangliae)
Abstract Photo‐identification surveys of humpback whales Megaptera novaeangliae were conducted at West Greenland during 1988–93, the last 2 years of which were part of the internationally coordinated humpback whale research programme YoNAH, with the primary aim of estimating abundance for the West G...
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crwiley:10.1017/s095283690400531x 2024-06-23T07:53:14+00:00 Distribution and abundance of West Greenland humpback whales ( Megaptera novaeangliae) Larsen, Finn Hammond, Philip S. 2004 http://dx.doi.org/10.1017/s095283690400531x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1017%2FS095283690400531X https://onlinelibrary.wiley.com/doi/pdf/10.1017/S095283690400531X https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1017/S095283690400531X en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Zoology volume 263, issue 4, page 343-358 ISSN 0952-8369 1469-7998 journal-article 2004 crwiley https://doi.org/10.1017/s095283690400531x 2024-05-31T08:15:58Z Abstract Photo‐identification surveys of humpback whales Megaptera novaeangliae were conducted at West Greenland during 1988–93, the last 2 years of which were part of the internationally coordinated humpback whale research programme YoNAH, with the primary aim of estimating abundance for the West Greenland feeding aggregation. The area studied stretched from the coast out to the offshore margin of the banks, determined approximately by the 200 m depth contours, between c . 61°70′N and c . 66°N. The surveys were conducted between early July and mid‐August and 993 h were expended on searching effort. A total of 670 groups of humpback whales was encountered leading to the identification of 348 individual animals. Three areas of concentration were identified: an area off Nuuk; an area at c . 63°30′N; and an area off Frederikshåb. Sequential Petersen capture–recapture estimates of abundance were calculated for five pairs of years at 357 (1988–89), 355 (1989–90), 566 (1990–91), 376 (1991–92), and 348 (1992–93). Excluding the anomalously high estimate in 1990–91, the simple mean is 359 ( se = 27.3, CV = 0.076) and the inverse CV‐squared weighted mean is 356 animals ( se = 24.9, CV = 0.070). These calculations lead us to conclude that between 1988 and 1993 there were 360 humpbacks (CV = 0.07) in the West Greenland feeding aggregation. Using the Cormack–Jolly–Seber model framework non‐calf survival rate was estimated at 0.957 ( se = 0.028). Our data have low power ( P < 0.3) to detect a trend of 3.1%, assuming the probability of a type I error was 0.05. Article in Journal/Newspaper Greenland Humpback Whale Megaptera novaeangliae Nuuk Wiley Online Library Greenland Nuuk ENVELOPE(-52.150,-52.150,68.717,68.717) Petersen ENVELOPE(-101.250,-101.250,-71.917,-71.917) Journal of Zoology 263 4 343 358 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Photo‐identification surveys of humpback whales Megaptera novaeangliae were conducted at West Greenland during 1988–93, the last 2 years of which were part of the internationally coordinated humpback whale research programme YoNAH, with the primary aim of estimating abundance for the West Greenland feeding aggregation. The area studied stretched from the coast out to the offshore margin of the banks, determined approximately by the 200 m depth contours, between c . 61°70′N and c . 66°N. The surveys were conducted between early July and mid‐August and 993 h were expended on searching effort. A total of 670 groups of humpback whales was encountered leading to the identification of 348 individual animals. Three areas of concentration were identified: an area off Nuuk; an area at c . 63°30′N; and an area off Frederikshåb. Sequential Petersen capture–recapture estimates of abundance were calculated for five pairs of years at 357 (1988–89), 355 (1989–90), 566 (1990–91), 376 (1991–92), and 348 (1992–93). Excluding the anomalously high estimate in 1990–91, the simple mean is 359 ( se = 27.3, CV = 0.076) and the inverse CV‐squared weighted mean is 356 animals ( se = 24.9, CV = 0.070). These calculations lead us to conclude that between 1988 and 1993 there were 360 humpbacks (CV = 0.07) in the West Greenland feeding aggregation. Using the Cormack–Jolly–Seber model framework non‐calf survival rate was estimated at 0.957 ( se = 0.028). Our data have low power ( P < 0.3) to detect a trend of 3.1%, assuming the probability of a type I error was 0.05. |
format |
Article in Journal/Newspaper |
author |
Larsen, Finn Hammond, Philip S. |
spellingShingle |
Larsen, Finn Hammond, Philip S. Distribution and abundance of West Greenland humpback whales ( Megaptera novaeangliae) |
author_facet |
Larsen, Finn Hammond, Philip S. |
author_sort |
Larsen, Finn |
title |
Distribution and abundance of West Greenland humpback whales ( Megaptera novaeangliae) |
title_short |
Distribution and abundance of West Greenland humpback whales ( Megaptera novaeangliae) |
title_full |
Distribution and abundance of West Greenland humpback whales ( Megaptera novaeangliae) |
title_fullStr |
Distribution and abundance of West Greenland humpback whales ( Megaptera novaeangliae) |
title_full_unstemmed |
Distribution and abundance of West Greenland humpback whales ( Megaptera novaeangliae) |
title_sort |
distribution and abundance of west greenland humpback whales ( megaptera novaeangliae) |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.1017/s095283690400531x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1017%2FS095283690400531X https://onlinelibrary.wiley.com/doi/pdf/10.1017/S095283690400531X https://zslpublications.onlinelibrary.wiley.com/doi/pdf/10.1017/S095283690400531X |
long_lat |
ENVELOPE(-52.150,-52.150,68.717,68.717) ENVELOPE(-101.250,-101.250,-71.917,-71.917) |
geographic |
Greenland Nuuk Petersen |
geographic_facet |
Greenland Nuuk Petersen |
genre |
Greenland Humpback Whale Megaptera novaeangliae Nuuk |
genre_facet |
Greenland Humpback Whale Megaptera novaeangliae Nuuk |
op_source |
Journal of Zoology volume 263, issue 4, page 343-358 ISSN 0952-8369 1469-7998 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1017/s095283690400531x |
container_title |
Journal of Zoology |
container_volume |
263 |
container_issue |
4 |
container_start_page |
343 |
op_container_end_page |
358 |
_version_ |
1802644797647749120 |