SIZE‐AND AGE‐CLASS SEGREGATION OF BOWHEAD WHALES SUMMERING IN NORTHERN FOXE BASIN: A PHOTOGRAMMETRIC ANALYSIS
A bstract To determine whether Hudson Bay‐Foxe Basin bowhead whales segregate on the basis of age, whales summering in northern Foxe Basin, were aerially photographed in August of 1996, 1997, and 1998. Image lengths on either the negatives or contact prints were measured and total body lengths were...
Published in: | Marine Mammal Science |
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Language: | English |
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Online Access: | http://dx.doi.org/10.1111/j.1748-7692.2003.tb01109.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2003.tb01109.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2003.tb01109.x |
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crwiley:10.1111/j.1748-7692.2003.tb01109.x 2024-09-30T14:35:12+00:00 SIZE‐AND AGE‐CLASS SEGREGATION OF BOWHEAD WHALES SUMMERING IN NORTHERN FOXE BASIN: A PHOTOGRAMMETRIC ANALYSIS Cosens, Susan E. Blouw, Andries 2003 http://dx.doi.org/10.1111/j.1748-7692.2003.tb01109.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2003.tb01109.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2003.tb01109.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 19, issue 2, page 284-296 ISSN 0824-0469 1748-7692 journal-article 2003 crwiley https://doi.org/10.1111/j.1748-7692.2003.tb01109.x 2024-09-03T04:23:47Z A bstract To determine whether Hudson Bay‐Foxe Basin bowhead whales segregate on the basis of age, whales summering in northern Foxe Basin, were aerially photographed in August of 1996, 1997, and 1998. Image lengths on either the negatives or contact prints were measured and total body lengths were estimated. In all three years the majority of whales photographed were ≤13.5 m long. Calves and juveniles made up 89.3%, 96.6%, and 79.3% of the total number of measured whales in 1996 (n = 28), 1997 (n = 30) and 1998 (n = 29) respectively. The number of bowheads >13.5 m, the approximate size at which females reach sexual maturity, that were photographed was directly proportional to the number of calves photographed. Our results indicate that northern Foxe Basin bowheads are part of a more widely distributed stock. Adult males and resting adult females apparently summer in another part of the range, probably northwestern Hudson Bay. Northern Foxe Basin appears to be used as a summer feeding area by cows with young‐of‐the‐year calves and by juveniles. Article in Journal/Newspaper Foxe Basin Hudson Bay Wiley Online Library Hudson Bay Hudson Foxe Basin ENVELOPE(-77.918,-77.918,65.931,65.931) Marine Mammal Science 19 2 284 296 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
A bstract To determine whether Hudson Bay‐Foxe Basin bowhead whales segregate on the basis of age, whales summering in northern Foxe Basin, were aerially photographed in August of 1996, 1997, and 1998. Image lengths on either the negatives or contact prints were measured and total body lengths were estimated. In all three years the majority of whales photographed were ≤13.5 m long. Calves and juveniles made up 89.3%, 96.6%, and 79.3% of the total number of measured whales in 1996 (n = 28), 1997 (n = 30) and 1998 (n = 29) respectively. The number of bowheads >13.5 m, the approximate size at which females reach sexual maturity, that were photographed was directly proportional to the number of calves photographed. Our results indicate that northern Foxe Basin bowheads are part of a more widely distributed stock. Adult males and resting adult females apparently summer in another part of the range, probably northwestern Hudson Bay. Northern Foxe Basin appears to be used as a summer feeding area by cows with young‐of‐the‐year calves and by juveniles. |
format |
Article in Journal/Newspaper |
author |
Cosens, Susan E. Blouw, Andries |
spellingShingle |
Cosens, Susan E. Blouw, Andries SIZE‐AND AGE‐CLASS SEGREGATION OF BOWHEAD WHALES SUMMERING IN NORTHERN FOXE BASIN: A PHOTOGRAMMETRIC ANALYSIS |
author_facet |
Cosens, Susan E. Blouw, Andries |
author_sort |
Cosens, Susan E. |
title |
SIZE‐AND AGE‐CLASS SEGREGATION OF BOWHEAD WHALES SUMMERING IN NORTHERN FOXE BASIN: A PHOTOGRAMMETRIC ANALYSIS |
title_short |
SIZE‐AND AGE‐CLASS SEGREGATION OF BOWHEAD WHALES SUMMERING IN NORTHERN FOXE BASIN: A PHOTOGRAMMETRIC ANALYSIS |
title_full |
SIZE‐AND AGE‐CLASS SEGREGATION OF BOWHEAD WHALES SUMMERING IN NORTHERN FOXE BASIN: A PHOTOGRAMMETRIC ANALYSIS |
title_fullStr |
SIZE‐AND AGE‐CLASS SEGREGATION OF BOWHEAD WHALES SUMMERING IN NORTHERN FOXE BASIN: A PHOTOGRAMMETRIC ANALYSIS |
title_full_unstemmed |
SIZE‐AND AGE‐CLASS SEGREGATION OF BOWHEAD WHALES SUMMERING IN NORTHERN FOXE BASIN: A PHOTOGRAMMETRIC ANALYSIS |
title_sort |
size‐and age‐class segregation of bowhead whales summering in northern foxe basin: a photogrammetric analysis |
publisher |
Wiley |
publishDate |
2003 |
url |
http://dx.doi.org/10.1111/j.1748-7692.2003.tb01109.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2003.tb01109.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2003.tb01109.x |
long_lat |
ENVELOPE(-77.918,-77.918,65.931,65.931) |
geographic |
Hudson Bay Hudson Foxe Basin |
geographic_facet |
Hudson Bay Hudson Foxe Basin |
genre |
Foxe Basin Hudson Bay |
genre_facet |
Foxe Basin Hudson Bay |
op_source |
Marine Mammal Science volume 19, issue 2, page 284-296 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.2003.tb01109.x |
container_title |
Marine Mammal Science |
container_volume |
19 |
container_issue |
2 |
container_start_page |
284 |
op_container_end_page |
296 |
_version_ |
1811638545560895488 |