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Survival and Growth of Brown Frog Juveniles Dispersing from Breeding Pondстатья
- Авторы: Lyapkov S.M., Cherdantsev V.G., Cherdantseva E.M., Severtsov A.S.
- Журнал: Entomological Review
- Том: 81
- Номер: S1
- Год издания: 2000
- Издательство: Scripta Technica
- Местоположение издательства: United States
- Первая страница: 167
- Последняя страница: 180
- Аннотация: In 1989 and 1990, the migration and survival rates and growth of Rana temporaria and R. arvalis ju-veniles were examined by means of the group marking method applied to recently metamorphosed individuals, and by recapture of juveniles along two different transects, each 700 m long. As compared with 1990, in 1989, ju-veniles of R. arvalis had smaller body size upon metamorphosis and higher density near the pond, with higher mortality rate in close proximity to it (up to 200 m) and higher survival rate at a considerable distance from the pond. In both years, the froglets that left the pond earlier had advantage of higher survival rate, but only at a dis-tance from the pond exceeding 200 m. Among the early metamorphosed juveniles, larger individuals better sur-vived in 1990, but not in 1989 (because of the higher density). Among the individuals that left the pond later, the survival rate was higher in large-sized juveniles in both years. Dispersing away from the pond, the juveniles at-tained larger average sizes in 1989, compared with 1990, and more completely compensated for the initial body size delay. The body sizes attained by the end of the season were the same for early small-sized and late large- and medium-sized individuals. In R. temporaria, the growth rate is higher than that in R. arvalis and compensation for the initially small body size of juveniles is practically complete.
- Добавил в систему: Ляпков Сергей Марленович