【摘要】 <正> 繁殖生态学的研究,由于与种群动态和群落生产力等理论问题、和一系列利用有益资源、防治有害动物等实践问题有密切关系,因而受到普遍的重视。在啮卤类繁殖生态的研究中,由于雌性繁殖强度,如怀孕率、窝数、胎仔数等,直接与种群数量变动有密切联系,因此首先重视雌性繁殖生态的研究。可以认为,这是抓住了矛盾的主要方面。大量工作,深入阐明了雌性繁殖强度的变化与种群数量变动间的依赖关系,为分析种群动态和数量测报提供许多科学依据。对于雄性的繁殖强度,虽然也常测量精巢和储精囊,但因反映繁殖强度变化的指标不完全,文献中常有低估和忽视雄性繁殖的情况。更多还原

【Abstract】 In the ecological studies of the rodent reproduction,the male reproductive intensity has often been neglected,because it lacks reliable indexes as those realed in the females.A new method of study was presented here,which is based upon the analysis of the dynamics of male reproductive intensity by means of scattered diagrams of correlation between the testicular length (or seminal vesicle) and the body weight (Figs.1 & 2).These diagrams demonstrate that there are three different stages of testicular growth.(1) Rudimental stage:at this stage the testis length shows no significant change,though the body weight is rapidly increasing;(2) growth stage:testis length increases proportionally to the increase of the body weight and (3) mature stage.The results show that the distribution of testis-length from monthly samples of the population is spreaded and the process of testicular growth is well demonstrated.According to these diagrams,it is easy to calculate the percentage of matured animals as well as thaf of the juveniles with rudimental testes (or seminal vesicle).Comparatiori of these indexes (Table I),especially the monthly regression lines of the testis-length in the growth stage (Pigs.3 & 4),shows that there is a similar seasonal variation of male reproductive intensity as that found in the females (Tables 2-4).Prom the above results,it seems evident that the analysis of reproductive intensity in male is worth while for further investigations as a new approach of the study of population dynamics and prognosis.The significance of this study has been discussed.更多还原