关键词: 高原鼠兔, 繁殖成功, 繁殖策略

Abstract: From April to August of 2002, the population reproductive ecology of plateau pikas (Ochotona curzoniae) were studied in the Haibei Research Station of Alpine Meadow Ecosystem by mark－recapture method. The reproduction of the plateau pika had significant difference in different reproductive periods. From late of April to May, it was the breeding peak of pika, at that time, the testis weight and the rate of gestation are the biggest. The body weight and testis weights of male adult also had apparent difference in different reproductive periods. There was a positive correlations between body weight and testis weights during 11 April to 10 May and 11 June to 10 July. The litter size had apparent difference in different reproductive time. But the litter size had no apparent difference in early stage of pregnancy and parturient stage. The young pikas which were borned from May to August were marked as L₁, L₂, L₃ , L₄ by the method of cohort. The survival rates of L₁ and L₂ were much higher than that of L₃ and L₄ at 20 days after birth. The survival rate of L₁ was evident higher than that of L₂ at 80 days after birth. The growth of different gender young pikas were not synchronization maturation. The young female pikas were developing faster than young male pikas in sexual maturation. So some young female pikas could take part in reproductive activity directly but young male could not. These results indicated that the reproductive strategy of plateau pikas had changed with the habitats in Haibei area. The plateau pika had decreased the investment of every reproductive activity, increased the times of reproductive activity and extended the reproductive period.

Key words: Plateau pika ( Ochotona curzoniae), Reproductive success, Reproductive strategy