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Changes in biological parameters of balaenopterid whales in the Antarctic, with special referece to southern minke whale
https://nipr.repo.nii.ac.jp/records/1905
https://nipr.repo.nii.ac.jp/records/19051f912fed-8642-41e9-a5e1-6a3f1e159db4
名前 / ファイル | ライセンス | アクション |
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||||
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公開日 | 1986-02-01 | |||||||
タイトル | ||||||||
言語 | en | |||||||
タイトル | Changes in biological parameters of balaenopterid whales in the Antarctic, with special referece to southern minke whale | |||||||
言語 | ||||||||
言語 | eng | |||||||
資源タイプ | ||||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||
資源タイプ | departmental bulletin paper | |||||||
ページ属性 | ||||||||
内容記述タイプ | Other | |||||||
内容記述 | P(論文) | |||||||
著者名(英) |
Kato, Hidehiro
× Kato, Hidehiro
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著者所属(英) | ||||||||
en | ||||||||
Whales Research Institute | ||||||||
抄録(英) | ||||||||
内容記述タイプ | Other | |||||||
内容記述 | 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". | |||||||
雑誌書誌ID | ||||||||
収録物識別子タイプ | NCID | |||||||
収録物識別子 | AA00733561 | |||||||
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue 巻 40, p. 330-344, 発行日 1986-02 |