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Structure of Relationship Between Fitness Components in Life History of Rana arvalis: 2. Dynamics of Fitness Componentsстатья
- Авторы: Lyapkov S.M., Cherdantsev V.G., Cherdantseva E.M.
- Журнал: Entomological Review
- Том: 81
- Номер: S1
- Год издания: 2001
- Издательство: Scripta Technica
- Местоположение издательства: United States
- Первая страница: S170
- Последняя страница: S179
- Аннотация: The influence of dates of metamorphosis (early and late), size at metamorphosis (small-, medium- and large-sized) and number of emerged juveniles on the survivorship and other fitness characteristics of females were studied by counting and group-marking of postmetamorphic Rana arvalis individuals of three generations. The females under study emerged after metamorphosis from the breeding pond and were recaptured in the same pond after 3–7 years as adults. Within the generation born in 1989, the survivorship of the group of early juveniles till first and each successive reproduction was higher than in late ones, but within the generation of 1990 this survivorship of early juveniles was lower than in late ones. The survivorship of females of 1990 was higher in comparison not only with the generation of 1989, characterized by smaller sizes at metamorphosis, also with the generation of 1991, characterized by maximum size at metamorphosis. The total number of eggs produced by a given generation was determined by premetamorphic survivorship, and correspondingly by the number of emerged juveniles of a given generation. The net rate of reproduction (calculated on the basis of life-tables) was determined by premetamorphic survivorship to a greater extent than by size at metamorphosis and survivorship till maturity. Within each generation, the net rate of reproduction of a given group was affected rather by its survivorship till each successive breeding than by fecundity. Therefore, in the generation of 1989, the early group had higher net rate of reproduction than the late one. Within the generation of 1990, the relationship between these two groups was inverse. Large-sized (both early and late) groups of 1989 had maximal net rate of reproduction, but these differences were not revealed within the generation of 1990.
- Добавил в систему: Ляпков Сергей Марленович