关键词: 高原鼠兔, 生命表, 自然寿命

Abstract: The natural longevity of plateau pika (Ochotona curzoniae) was investigated asa part of a long-term study of the behavicral ecology of the population of plateau pika near Qinghai Lake． During June 1984，April—July and October l985 and 1986 all adults and iuveniles totally 401 indiv ．were marked．All the marked animals alive within and nearthe study area were investigated by the author．The main results are as follows：
The mortality rate of plateau pika varied throughout the age．And of the young stage ( aged from the day of birth to 20 days) is low ，whereas subadult stage (2l-40days mortality rate is high。and of the adult Stage (from the age of 40 days on) declines． Mortality rate increases in the old pikas aging over 540 days．
The mortality rate varied throughout the season，being high in Summer． Another high rate of mortality occures at the beginning and the end of winter．
The mean mortality rate (q_x ) for all ages calculated from Table1 is 0.154． The mean mortality rates of pikas from three different litters during the 1986 to February 1987 are as follows: Litter_l， of the male is 0.169，and that of the female is 0.172．Litter₂，of the male 0.294，and of the female 0.261．Litter ₃，of the male 0.575， and of the female 0.786．
The greatest longevity of marked population of plateau pika in field is 957 days．The mean 119.9 days．
The mean longevities of pikas from the three litters during the 1986 to February 1987 are as follows: Litter₁，of the male is 108 days，and of the female 106 days．Litter₂，of the male 58 days，and of the female 86.3 days．Litter₃，of the male 24.8 days，and of the female 15.4 days．
The survivor curve of plateau pika is L type．