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Structure of Relationship between Fitness Components in Life History of Rana arvalis: 1. Dynamics of Reproductive Effort and Its Componentsстатья
- Авторы: Lyapkov S.M., Cherdantsev V.G., Cherdantseva E.M.
- Журнал: Entomological Review
- Том: 80
- Номер: S1
- Год издания: 2001
- Издательство: Scripta Technica
- Местоположение издательства: United States
- Первая страница: S161
- Последняя страница: S169
- Аннотация: The influence of dates of metamorphosis, size at metamorphosis, and number of emerged juveniles on the reproductive characteristics and female body size were studied by group-marking of ostmetamorphic Rana arvalis individuals of three generations. The frogs under study emerged after metamorphosis from the breeding pond and their adults were recaptured in the same pond after 3–7 years. The maximum body size, egg size, and reproductive effort were revealed in the females born in 1991. This generation is characterized by the maximum size at metamorphosis and the minimum number of emerged juveniles. At the same time, similar variations in the mean annual values of body length, fecundity, and egg diameter were revealed in females of different generations. The differences between the generations of 1989 and 1990 are less pronounced, despite the similar size at metamorphosis and about the same initial number of juveniles. An increase in the female fecundity and egg diameter (but not in reproductive effort) with age was the general trend for each generation. Mature females originating from early juveniles were, on the average, significantly younger than late juveniles of the same generation. Most of females from the group of late small-sized animals reproduced for the first time after 4th wintering, i.e. one year later than other groups. The groups distinguished within generation differed in reproductive characteristics only slightly. In the early-large female group, a positive correlation between the size at metamorphosis and rates of growth and maturation was revealed.
- Добавил в систему: Ляпков Сергей Марленович