Fertilitatea și mortalitatea claselor de varstă ale speciei Microtus arvalis Rodentia, Cricetidae
The present paper analyses fertility and mortality of age classes of two species of microtine. The dominant number of the female population and the increase of the period of reproduction represents a strategic peculiarity of reproduction. It has been explained the importance of different age groups...
| Published in: | Actual problems of zoology and parasitology: achievements and prospects |
|---|---|
| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | Romanian |
| Published: |
2017
|
| Subjects: | |
| Online Access: | https://ibn.idsi.md/vizualizare_articol/65901 https://doi.org/10.53937/9789975665902.99 |
| Summary: | The present paper analyses fertility and mortality of age classes of two species of microtine. The dominant number of the female population and the increase of the period of reproduction represents a strategic peculiarity of reproduction. It has been explained the importance of different age groups in regulating the number of population. The year adverse conditions prevail, the number of individuals of the current year increases to maintain the number of population, while the year optimal conditions prevail, the number of individuals that wintered increases. A primary adaptive importance is the instability of the reproductive cycle which contributes to the survival of the potential producers in a short period of time and leads to their increase in number under favourable conditions. The maximal offspring is recorded only in physiologically mature individuals for whom the growth ended. Reproduction, which is mainly charactersitc of younger individuals, represents an adaptation in adverse conditions. |
|---|