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長崎半島沿岸水域に出現するクラゲ類


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Title: 長崎半島沿岸水域に出現するクラゲ類
Other Titles: Jellyfishes Occurring in the Coastal Waters off Nagasaki Peninsula, Kyushu, Japan
Authors: 金城, 清昭 / 千田, 哲資
Authors (alternative): Kanashiro, Kiyoaki / Senta, Tetsushi
Issue Date: Feb-1985
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.57, pp.23-31; 1985
Abstract: Occurrences of jellyfishes in a shallow water off the southwestern extremity of the Nagasaki peninsula, Kyushu were studied by means of collections with a 71.4-cm plankton sampler, by scooping from a small boat, and by diving from May 1977 to January 1978. We collected 29 species belonging to 17 families of Coelenterata and seven species of seven families from Ctenophora. The annual dominant among coelenterates was Liriope tetraphylla, while that among ctenophores was Bolinopsis mikado. Both young and mature individuals of Liriope tetraphylla occurred throughout the study period. They tended to grow to a larger size in winter than in summer. Charybdea rastonii, which occurred in summer and autumn, were separated into two distinct size groups after late summer. Charybdea rastonii were distributed almost exclusively within 10 or 20 m of shore, while dense patches of ctenophores were often observed around the plankton net stations as well as close to the beach line. Abundances of siphonophores in the nearshore waters seemed to be correlated with fluctuations in the strength of the open sea water. The main species which stings and often gives severe pain and occasional mortalities to bathers in Nagasaki Prefecture are probably Olindias formosa during the early part of summer and Charybdea rastonii in the late summer. / 1977年5月~1978年1月に長崎半島突端附近の浅海域において,クラゲ類の採集をおこない,腔腸動物門17科22属29種,有櫛動物門7科7属7種を得た.年間を通じての優勢種は,腔腸動物門ではカラカサクラゲと幾つかの鐘泳亜目のクラゲ,有櫛動物門ではカブトクラゲであった. カラカサクラゲは研究期間を通じて極く若い小型個体と成熟個体が平行して出現し,低水温期には高水温期に比べより大きく生長するのがみられた.アンドンクラゲは夏~秋に出現し,晩夏以降はつきり分れた大小2型の群が認められた. アンドンクラゲは距岸20m以内の岸近くにのみ分布し,有櫛類は濃密なパツチを形成する.管水母目鐘泳亜目の岸近での出現量は,その水域に流入する外洋水の長期的および短期的消長を反映しているようだ.長崎県下の海水浴場で人を刺傷するクラゲの主体はシーズン初期においてはハナガサクラゲ,後半においてはアンドンクラゲであると考えられる.
URI: http://hdl.handle.net/10069/30386
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第57号

Citable URI : http://hdl.handle.net/10069/30386

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