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Title: カギノテクラゲの一種(刺胞動物門, ヒドロ虫綱, 淡水クラゲ目)の付着姿勢
Other Titles: Attachment posture of Gonionemus vertes (Cnidaria, Hydrozoa, Limnomedusae)
Authors: 久保田, 信  KAKEN_name
Author's alias: Kubota, Shin
Issue Date: 20-Jan-2018
Publisher: 日本生物地理学会
Journal title: 日本生物地理学会会報 = Bulletin of the Biogeographical Society of Japan
Volume: 72
Start page: 247
End page: 249
Abstract: The behavior of a mature medusa (12.2 mm in umbrella diameter) of Gonionemus vertens A. Agassiz, 1862 with 34 tentacles was observed for a week during a period from May 27th to June 2nd in 2017, paying attention to attachment posture, in running seawater (21-22℃) without food. Observations were conducted 38 times, mainly in the daytime on clear weather days at various intervals (25-267 minutes). The medusa attached to the bottom or side surface of the polypropylene rearing container and also on the silicon rubber tube by adhesive pads on tentacles: with the posture of oral side downwards (27 times) or oral side upwards (7 times), and swimming (4 times). Upside down attachment posture was observed 4 out of 7 days, and its opposite, normal posture, was observed 6 out of 7 days. Swimming was observed primarily in the dusk or early morning. G. vertens can attach to the substratum with a normal or opposite posture using the adhensive pads on the tentacles. The behavioural differences overlap with G. vertens and G. sp. recently described by Suehiro and Kubota (2015) from Toba, Mie Prefecture, Japan.
小型の海水かけ流し水槽内に収容したカギノテクラゲ(和歌山県産)の行動を、2017年5月末から6月初旬の1週間の期間中、主に晴天日の昼間に調査した。計38回の観察(一日の内での間隔は25-267分)で、口側を下にして付着する姿勢がほとんどであった(27回)が、逆の姿勢も示した(7回)。また、残り4回は遊泳で、早朝や薄暮時にみられた。今回の観察結果から、前報(末廣・久保田, 2015)で三重県鳥羽産のカギノテクラゲの一種が継続して見せた逆さでない付着姿勢を、本種もとれることが分かり、2種間の付着姿勢の仕方は重なった。
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