Observations on gray whale ( Eschrichtius robustus) utilization patterns in the northeastern Chukchi Sea, July–October 1982–1987
A total of 821 gray whales were seen during aerial surveys in the northeastern Chukchi Sea from July through October 1982–1987. Gray whale distribution extended from south of Point Hope to northeast of Point Barrow, Alaska, between 0.5 and 166 km offshore. Monthly abundance estimates (number of whal...
Published in: | Canadian Journal of Zoology |
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Language: | English |
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Canadian Science Publishing
1989
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Online Access: | http://dx.doi.org/10.1139/z89-374 http://www.nrcresearchpress.com/doi/pdf/10.1139/z89-374 |
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crcansciencepubl:10.1139/z89-374 2024-06-23T07:51:39+00:00 Observations on gray whale ( Eschrichtius robustus) utilization patterns in the northeastern Chukchi Sea, July–October 1982–1987 Clarke, Janet T. Moore, Sue E. Ljungblad, Donald K. 1989 http://dx.doi.org/10.1139/z89-374 http://www.nrcresearchpress.com/doi/pdf/10.1139/z89-374 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 67, issue 11, page 2646-2654 ISSN 0008-4301 1480-3283 journal-article 1989 crcansciencepubl https://doi.org/10.1139/z89-374 2024-06-06T04:11:15Z A total of 821 gray whales were seen during aerial surveys in the northeastern Chukchi Sea from July through October 1982–1987. Gray whale distribution extended from south of Point Hope to northeast of Point Barrow, Alaska, between 0.5 and 166 km offshore. Monthly abundance estimates (number of whales/survey hour) were highest in July (6.81) and lowest in October (0.40). Gray whales were usually in open water (82%, n = 670) or in light ice (16%, n = 134) and were seldom associated with heavy ice (2%, n = 17). Most whales were feeding (63%, n = 514), with the majority of the others swimming and diving (24%, n = 193) or forming part of a cow–calf association (9%, n = 72). One group of three whales was involved in sexual activity. Feeding whales were seen most often within 40 km of the shore, but also occurred offshore. Thirty-six gray whale calves were seen. Calf abundance (number of calves/survey hour) was significantly higher (p < 0.001) in July, when 92% (n = 33) of all calves were seen, than in any other month. Most cow–calf pairs were seen nearshore between Point Hope and Point Barrow. Monthly calf ratios (number of calves/number of whales) ranged from 0.09 in July to 0.00 in October, with an overall rate of 0.04. Article in Journal/Newspaper Barrow Chukchi Chukchi Sea Point Barrow Alaska Canadian Science Publishing Chukchi Sea Point Hope ENVELOPE(173.306,173.306,52.911,52.911) Canadian Journal of Zoology 67 11 2646 2654 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
A total of 821 gray whales were seen during aerial surveys in the northeastern Chukchi Sea from July through October 1982–1987. Gray whale distribution extended from south of Point Hope to northeast of Point Barrow, Alaska, between 0.5 and 166 km offshore. Monthly abundance estimates (number of whales/survey hour) were highest in July (6.81) and lowest in October (0.40). Gray whales were usually in open water (82%, n = 670) or in light ice (16%, n = 134) and were seldom associated with heavy ice (2%, n = 17). Most whales were feeding (63%, n = 514), with the majority of the others swimming and diving (24%, n = 193) or forming part of a cow–calf association (9%, n = 72). One group of three whales was involved in sexual activity. Feeding whales were seen most often within 40 km of the shore, but also occurred offshore. Thirty-six gray whale calves were seen. Calf abundance (number of calves/survey hour) was significantly higher (p < 0.001) in July, when 92% (n = 33) of all calves were seen, than in any other month. Most cow–calf pairs were seen nearshore between Point Hope and Point Barrow. Monthly calf ratios (number of calves/number of whales) ranged from 0.09 in July to 0.00 in October, with an overall rate of 0.04. |
format |
Article in Journal/Newspaper |
author |
Clarke, Janet T. Moore, Sue E. Ljungblad, Donald K. |
spellingShingle |
Clarke, Janet T. Moore, Sue E. Ljungblad, Donald K. Observations on gray whale ( Eschrichtius robustus) utilization patterns in the northeastern Chukchi Sea, July–October 1982–1987 |
author_facet |
Clarke, Janet T. Moore, Sue E. Ljungblad, Donald K. |
author_sort |
Clarke, Janet T. |
title |
Observations on gray whale ( Eschrichtius robustus) utilization patterns in the northeastern Chukchi Sea, July–October 1982–1987 |
title_short |
Observations on gray whale ( Eschrichtius robustus) utilization patterns in the northeastern Chukchi Sea, July–October 1982–1987 |
title_full |
Observations on gray whale ( Eschrichtius robustus) utilization patterns in the northeastern Chukchi Sea, July–October 1982–1987 |
title_fullStr |
Observations on gray whale ( Eschrichtius robustus) utilization patterns in the northeastern Chukchi Sea, July–October 1982–1987 |
title_full_unstemmed |
Observations on gray whale ( Eschrichtius robustus) utilization patterns in the northeastern Chukchi Sea, July–October 1982–1987 |
title_sort |
observations on gray whale ( eschrichtius robustus) utilization patterns in the northeastern chukchi sea, july–october 1982–1987 |
publisher |
Canadian Science Publishing |
publishDate |
1989 |
url |
http://dx.doi.org/10.1139/z89-374 http://www.nrcresearchpress.com/doi/pdf/10.1139/z89-374 |
long_lat |
ENVELOPE(173.306,173.306,52.911,52.911) |
geographic |
Chukchi Sea Point Hope |
geographic_facet |
Chukchi Sea Point Hope |
genre |
Barrow Chukchi Chukchi Sea Point Barrow Alaska |
genre_facet |
Barrow Chukchi Chukchi Sea Point Barrow Alaska |
op_source |
Canadian Journal of Zoology volume 67, issue 11, page 2646-2654 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z89-374 |
container_title |
Canadian Journal of Zoology |
container_volume |
67 |
container_issue |
11 |
container_start_page |
2646 |
op_container_end_page |
2654 |
_version_ |
1802642777943572480 |