安徽淮北农区大仓鼠和黑线仓鼠种群动态的研究

1982一1988年在安徽淮北农区的调查结果表明:大仓鼠种群数量的季节消长特点是,数量高的年份出现3个波峰(即前峰、中峰和后峰),平常年份有2个波峰(中峰和后峰),数量低的年份仅1个波峰(后峰)。波峰峰度大都是后峰最高。黑线仓鼠的波峰数除个别数量高的年份有2个(前峰和中峰)外,多数年份只有1个前峰。两种仓鼠的年间数量变幅皆较明显,推测两鼠各自从一个高峰期到另一个高峰期之间需经历7—8年左右时间。繁殖期,大仓鼠为7个月(4—10月),黑线仓鼠为10个月(2—11月);两者均有两个繁殖盛期,即春峰和秋峰经相关分析,大仓鼠的年数量与年怀孕率存在密切的正相关关系,而黑线仓鼠则为年怀孕率对次年数量有明显的影响。

STUDIES ON THE PODULATION DYNAMICS OF RATLIKE HAMSTER AND STRIPED HAMSTER IN RURAL DISTRICTS OF NORTHERN HUAIHE RIVER, ANHUI

The population dynamics of ratlike hamster (Cricetulus triton) and striped hamster (Cricetulus barabensis) has been studied in Northern Huaihe River,Anhui, during 1982 to 1988. The results are as follows:The peaks of the seasonal numbers of ratlike hamster in the fluctuation curve varies from year to year. There were three peaks (Mar. , July, Oct.) in higher-number year, two (July, Oct.) in middle-number year and one (Oct., or Nov.) in lower-num ber year. For striped hamster, there were two (Apr., Aug.) in higher-number year and one (Mar. to May) in lower-number year. The annual number variations of the former and the latter in 8 yeats (from 1981-1988) are in figure 3 in the fluctuation curve respectively. The reproductive periods of ratlike hamster and striped hamster in this area last 7 months (Apr. to Oct.) and 10 months (Feb. to Nov.)respectively, and both of them have two peaks during reproduction (one in sprineg and the other in autumn). Analysis showed that the pregnancy rate of the former is remarkably positive correlated with the number in this year (correlation coefficient r value is 0.894 ) and that of the latter only affects the numbers of the next year (r value is 0.919).