- 著者
- 奥野 良之助
- 出版者
- 日本生態学会
- 雑誌
- 日本生態学会誌 (ISSN:00215007)
- 巻号頁・発行日
- vol.34, no.1, pp.113-121, 1984-03-30
About 1,500 individuals of the Japanese toad, Bufo japonicus japonicus, inhabiting the campus of Kanazawa University were studied by the toe-clipping marking method from 1973 to 1981. Investigations of the six breeding ponds on the campus revealed that toads belonging to each breeding group generally went to the same pond for breeding every spring throughout their life. The largest breeding group (pond H-group) had about 200 adult males and females, and the smallest one (pond N-group) had only 20 adults. Emigrations of toads among these breeding groups sometimes occurred. Twenty-five toads changed their breeding pond during the 8 years ; twenty-three of them moved from the largest pond H-group to the neighbouring smaller Y-and M-group ponds. Therefore, it was concluded that emigrations may occur from a larger group to a smaller one.
- 著者
- 奥野 良之助
- 出版者
- 日本生態学会
- 雑誌
- 日本生態学会誌 (ISSN:00215007)
- 巻号頁・発行日
- vol.38, no.1, pp.27-34, 1988-04-30
Life histories of 16 males and 3 females and survival records of 9 injured individuals of the Japanese toad, Bufo japonicus japonicus, are described. Sixteen males which lived from 8 to 11 years participated in the breeding ritual an average of 5.1 times, mated females an average of 1.3 times, and reached 119.7mm in snout-vent length throught their lives. Three females which lived from 7 to 9 years spawned 2.7 times and reached 117.0mm. Extensive data was provided by one male without a left hind leg which was recaptred 55 times during his 8 years life. The fact that this male participated in the breeding ritual 4 times, successfully copulated once, and reached 114mm in body length illustrates that intraspecific competition in the Japanese toad is not as severe as in other species.
- 著者
- 奥野 良之助
- 出版者
- 一般社団法人 日本生態学会
- 雑誌
- 日本生態学会誌 (ISSN:00215007)
- 巻号頁・発行日
- vol.35, no.1, pp.93-101, 1985-03-30 (Released:2017-05-23)
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.
- 著者
- 奥野 良之助
- 出版者
- 一般社団法人 日本生態学会
- 雑誌
- 日本生態学会誌 (ISSN:00215007)
- 巻号頁・発行日
- vol.38, no.1, pp.27-34, 1988-04-30 (Released:2017-05-24)
Life histories of 16 males and 3 females and survival records of 9 injured individuals of the Japanese toad, Bufo japonicus japonicus, are described. Sixteen males which lived from 8 to 11 years participated in the breeding ritual an average of 5.1 times, mated females an average of 1.3 times, and reached 119.7mm in snout-vent length throught their lives. Three females which lived from 7 to 9 years spawned 2.7 times and reached 117.0mm. Extensive data was provided by one male without a left hind leg which was recaptred 55 times during his 8 years life. The fact that this male participated in the breeding ritual 4 times, successfully copulated once, and reached 114mm in body length illustrates that intraspecific competition in the Japanese toad is not as severe as in other species.