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Title: 放射能の影響下にある福島県と茨城県産ベニクラゲとニホンベニクラゲ(ヒドロ虫綱, 花クラゲ目)の奇形
Other Titles: Aberrant medusae of Turritopsis rubra and T.sp. (Hydrozoa, Anthomedusae) from Fukushima and lbaragi Prefectures, Japan where affected by radioactivity
Authors: 久保田, 信  KAKEN_name
北田, 博一  KAKEN_name
菅野, 和彦  KAKEN_name
Author's alias: Kubota, Shin
Kitada, Hirokazu
Kanno, Kazuhiko
Keywords: aberrant
oral lips
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: 219
End page: 222
Abstract: Aberrant female and male medusae of Turritopsis rubra and T. sp. (most frequently those with three oral lips and three gonads, but with normal four radial canals) were found (c 13% incidence in female of both species, n = 107, 85) in November, 2016 from Iwaki City, Fukushima Prefecture, Japan. In both species, parasitic trematoda was found; in T. sp. maximally eight individuals/normal medusa and five ones/aberrant medusa. Moreover, in the same place in Fukushima Prefecture and in the other place in Ibaragi Prefecture aberrant Turritopsis rubra mature medusae without oral lips or with 1, 2, 3, 5 oral lips, were also found (18.3 %, n = 142 in Otsu harbour in Ibaragi Prefecture) in October, 2017
放射能の影響下にある福島県いわき市で2016年11月に同時採集したベニクラゲとニホンベニクラゲの成熟クラゲの雌雄において, 放射管は4本で正常だが口唇や生殖巣が三つの奇形などが出現した(2種の雌で各々約13%の奇形率, n= 107, 85). 2種とも吸虫類の寄生があり, ニホンベニクラゲの正常個体に最多で8個体. 奇形個体には5個体が見られた. 加えて, 福島県の同地点と茨城県の別地点で2017年10月に採集したベニクラゲの成熟クラゲで, 口唇が無いもの, 一つ, 二つ, 三つ. 五つ持つ個体等の奇形個体が出現したので(茨城県大津港で18.3%の奇形率, n= 142), それらの形態も記載した.
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