日本産3種のベニクラゲ(ヒドロ虫綱, 花クラゲ目)の若返り率の相違

Abstract

Rejuvenation of very young medusa among three species of Turritopsis (Hydrozoa, Anthomedusae) induced by body damage by means of needle sticking is examined. As a result, rejuvenation rate of a small species from Okinawa Island, Okinawa Prefecture and another small species from Shirahama,Wakayama Prefecture in southern Japan is high (65.4, 87. 0%, respectively) in contrast to the rate of a large species from Ootsu harbour, Ibaragi Prefecture in northern Japan ( less than 10%). Rejuvenation rate of very young medusa between a small species from Okinawa and well-grown medusa of a large species from Ibaragi induced by exclusively starvation is also clearly different, and the former shows higher rate than that of the latter (31.6% vs 9.1%).