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津軽海峡内におけるカマイルカの季節的・地理的分布について

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Title: 津軽海峡内におけるカマイルカの季節的・地理的分布について
Other Titles: Seasonal and geographical distribution of Pacific white-sided dolphin (Lagenorhynchus obliquidens) in the Tsugaru Strait
Authors: 柴田, 泰宙1 Browse this author
片平, 浩孝2 Browse this author
篠原, 沙和子3 Browse this author
鈴木, 初美4 Browse this author
岡田, 佑太5 Browse this author
上田, 茉莉6 Browse this author
鵜山, 貴史7 Browse this author
飯塚, 慧8 Browse this author
松石, 隆9 Browse this author →KAKEN DB
Authors(alt): Shibata, Yasutoki1
Katahira, Hirotaka2
Shinohara, Sawako3
Suzuki, Hatsumi4
Okada, Yuta5
Ueda, Mari6
Uyama, Takashi7
Iizuka, Satoshi8
Matsuishi, Takashi9
Issue Date: 7-Jul-2007
Publisher: 日本セトロジー研究会
Journal Title: 日本セトロジー研究
Journal Title(alt): Japan cetology
Volume: 17
Start Page: 11
End Page: 14
Abstract: カマイルカは津軽海峡において最も多く発見される鯨種である.本研究では2003年5月から2006年2月までのフェリーからの鯨類の目視発見記録を分析し,津軽海峡内でのカマイルカの季節的・地理的分布について考察した.発見記録から鯨類およびカマイルカの発見群数,遭遇率を算出し,津軽海峡-陸奥湾間を北からA,B,C,Dの4つの区域に分け,この区分を用いて月別発見群数を計数し分布推移を調べた.カマイルカの出現ピークは4~6月であった.また,区域B,C,Dでは5月に遭遇率が最高値をとり,6月は減少した. 津軽海峡での季節変化として,津軽海峡を通過するカマイルカの大多数が春季に来遊し,夏季以降には稀にしか来遊しないと考えられた.分布推移として,4月~5月に日本海から津軽海峡に入ってきたカマイルカの多くは,一端,陸奥湾入口付近~陸奥湾内に滞留した後,津軽暖流水に乗って太平洋へと移動するものと推察された.
Pacific white-sided dolphins (PWS) are the most frequently observed cetacean in the Tsugaru Strait. In this study, the data of sighting survey conducted from ferry vessels between Hakodate and Aomori from May 2003 to February 2006 was analyzed. Seasonal and geographical distributions of PWS in the strait were discussed. Four areas in the strait were defined according to the latitude, and the number of observations and encounter rate of PWS in each area was calculated monthly for the investigation of the difference of the distribution. The results indicated that PWS were frequently appeared only from April to June. The encounter rates in the southern 3 areas were peaked in May, and then declined in June. It suggests that they appeared frequently in spring in the strait, and appeared occasionally in the other seasons, and most of the PWS stayed once around the mouth or inside of the Mutsu bay, and then moved to Pacific Ocean following the Tsugaru warm current.
Type: article (author version)
URI: http://hdl.handle.net/2115/35487
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松石 隆

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