著者

笠松 不二男

出版者

公益社団法人 日本アイソトープ協会

雑誌

RADIOISOTOPES (ISSN:00338303)

巻号頁・発行日

vol.48, no.4, pp.266-282, 1999-04-15 (Released:2011-03-10)

参考文献数

62

被引用文献数

32

著者

笠松 不二男

出版者

公益社団法人 日本アイソトープ協会

雑誌

Radioisotopes (ISSN:00338303)

巻号頁・発行日

vol.48, no.4, pp.266-282, 1999-04-15

被引用文献数

9 32

著者

笠松 不二男 田中 昌一

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.58, no.4, pp.637-651, 1992 (Released:2008-02-29)

参考文献数

19

被引用文献数

15 20

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A study was conducted on yearly changes of prey species of minke whales off Japan, using data recorded by whalers on the stomach contents of 10, 164 minke whales taken in coastal whaling operations from 1948-87. Clear changes in the diet were observed in three recognized whaling grounds off the Pacific coast of northern Japan in the southern Sea of Okhotsk after the mid-1970's, notably the emergence of Japanese pilchard as a major prey species. A clear upward trend in the incidence of whales having Japanese pilchard coincided with an increase in catch and index of abundance of this species in commercial fisheries. A pronounced change of prey species from chub mackerel to Japanese pilchard was observed off the Pacific coast of Hokkaido in 1977, while the dominant species taken by purse seine fisheries in the same area in 1976 also changed from chub mackerel to Japanese pilchard. The relationship between changes in the diet of minke whales and changes of dominant species in the pelagic biocenosis is discussed.

著者

笠松不二男 宮下富夫 吉岡基著 本山賢司イラストレーション

出版者

東京大学出版会

巻号頁・発行日

2009