ニホンヒキガエルBufo japonicus japonicusの自然誌的研究 : V.変態後の生残率と寿命
1985 年 35 巻 1 号 p. 93-101
詳細
1985 年 35 巻 1 号 p. 93-101
OKUNO, Ryonosuke (Dept. Biol., Fac. Sci., Kanazawa Univ., Ishikawa). 1985. Studies on the natural history of the Japanese toad, Bufo japonicus japonicus. V. Post-metamorphic survival and longevity. Jap. J. Ecol., 35 : 93-101. Post-metamorphic survival rates of the Japanese toad, Bufo japonicus japonicus, inhabiting the Botanical Gardens of Kanazawa University were as follows : Survival rate between 1 and 2 years of age was about 40% ; between 2 and 3 years of age was 40-70% ; between 4 and 5 years of age was 65-80%. Survival rates were decreased gradually after age 5,although they were kept over 50% to age 8. Four out of 178 individuals, which had been marked at age 1 in the autumn of 1973,were still surviving in the spring of 1981 (9 years old). Longevity of the males was presumed to be 11 years, and that of the females was estimated at 8 or 9 years. Sex ratio (♂/♀) of matured toads was 2.71.
