Changes in biological parameters of balaenopterid whales in the Antarctic, with special referece to southern minke whale
Historical changes in biological parameters of the southern balaenopterid whales were comparatively examined by reviewing the reports and information as well as on the new analyses for the minke whale (Balaenoptera acutorostrata) in the Antarctic region during the 1920's and the 1982/83 season....
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Whales Research Institute
1986
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ftnipr:oai:nipr.repo.nii.ac.jp:00001905 2023-05-15T13:47:59+02:00 Changes in biological parameters of balaenopterid whales in the Antarctic, with special referece to southern minke whale Hidehiro Kato 1986-02 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1905 http://id.nii.ac.jp/1291/00001905/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1905&item_no=1&attribute_id=18&file_no=1 en eng Whales Research Institute https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1905 http://id.nii.ac.jp/1291/00001905/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 40, 330-344(1986-02) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1905&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1986 ftnipr 2022-11-12T19:42:46Z Historical changes in biological parameters of the southern balaenopterid whales were comparatively examined by reviewing the reports and information as well as on the new analyses for the minke whale (Balaenoptera acutorostrata) in the Antarctic region during the 1920's and the 1982/83 season. Two types of density-dependent changes were identified; changes by catch intensity itself for the blue (B. musculus) and the fin (B. physalus) whales and changes by interspecific competition for the sei (B. borealis) and the minke whales. However, further considerations would be needed in the changes of the sei whale. Even though the recently proposed possible biases are considered, the following declining trend of age at sexual maturity for the minke whale is thought to be real; from 12-13 years in the mid-1940's to 7-8 years in the early 1970's and from 11-12 years in the late 1940's to 8 years in the mid-1970's, classified by the age of maturation which indicates cross sectional population (=year of catch). A change in pregnancy rate of the minke whale, from 0.55-0.59 in the 1940's to 0.78 in the 1970's was suggested by using a "balance equation". Report Antarc* Antarctic Balaenoptera acutorostrata Memoirs of National Institute of Polar Research minke whale Polar Research Sei Whale National Institute of Polar Research Repository, Japan Antarctic The Antarctic |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
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ftnipr |
language |
English |
description |
Historical changes in biological parameters of the southern balaenopterid whales were comparatively examined by reviewing the reports and information as well as on the new analyses for the minke whale (Balaenoptera acutorostrata) in the Antarctic region during the 1920's and the 1982/83 season. Two types of density-dependent changes were identified; changes by catch intensity itself for the blue (B. musculus) and the fin (B. physalus) whales and changes by interspecific competition for the sei (B. borealis) and the minke whales. However, further considerations would be needed in the changes of the sei whale. Even though the recently proposed possible biases are considered, the following declining trend of age at sexual maturity for the minke whale is thought to be real; from 12-13 years in the mid-1940's to 7-8 years in the early 1970's and from 11-12 years in the late 1940's to 8 years in the mid-1970's, classified by the age of maturation which indicates cross sectional population (=year of catch). A change in pregnancy rate of the minke whale, from 0.55-0.59 in the 1940's to 0.78 in the 1970's was suggested by using a "balance equation". |
format |
Report |
author |
Hidehiro Kato |
spellingShingle |
Hidehiro Kato Changes in biological parameters of balaenopterid whales in the Antarctic, with special referece to southern minke whale |
author_facet |
Hidehiro Kato |
author_sort |
Hidehiro Kato |
title |
Changes in biological parameters of balaenopterid whales in the Antarctic, with special referece to southern minke whale |
title_short |
Changes in biological parameters of balaenopterid whales in the Antarctic, with special referece to southern minke whale |
title_full |
Changes in biological parameters of balaenopterid whales in the Antarctic, with special referece to southern minke whale |
title_fullStr |
Changes in biological parameters of balaenopterid whales in the Antarctic, with special referece to southern minke whale |
title_full_unstemmed |
Changes in biological parameters of balaenopterid whales in the Antarctic, with special referece to southern minke whale |
title_sort |
changes in biological parameters of balaenopterid whales in the antarctic, with special referece to southern minke whale |
publisher |
Whales Research Institute |
publishDate |
1986 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1905 http://id.nii.ac.jp/1291/00001905/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1905&item_no=1&attribute_id=18&file_no=1 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Balaenoptera acutorostrata Memoirs of National Institute of Polar Research minke whale Polar Research Sei Whale |
genre_facet |
Antarc* Antarctic Balaenoptera acutorostrata Memoirs of National Institute of Polar Research minke whale Polar Research Sei Whale |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1905 http://id.nii.ac.jp/1291/00001905/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 40, 330-344(1986-02) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1905&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766248326472138752 |