关键词: 黑线姬鼠, 大仓鼠, 黑线仓鼠, 种群动态, 种群年龄组成

Abstract: This paper deals with the relatlonship of the population dynamics and the age composition of striped field mouse(Apodonus agrarius)，ratlike hamster (Cricetulus triton)and striped hamster (Cricetulus barabeasis).The specimens of three rodents were collected in Northern Huaihe River, Anhui Province during 1982 to 1988, and with the growth and the wear of upper molar as the age griteria, the specimens were divided into five age groups. juvenile(I), subadult(Ⅱ), adult I (Ⅱ) adult Ⅱ (Ⅳ)and senior (V ). Analyes showed that the age composition of each species in the differentseason varied regularly．The proportions of the adult Ⅱ (or the senior)in the age composition were very high before the beginning of the reproductive period of them,and after the reproductive period owing to the new members from breeding uninterrupted puting in the population, that of each group in the composition correspondingly varied with the thanchanges of age in the population. This propertions in the age composition varied from year to year too. In addition, the major colonies of reproduction in the population were the adult Ⅱ in striped field mouse and Mriptd hamster，and the adult I in ratlike hamster．As for the relationship between the population dynamies and the age composition of the population of three, the annual numbers was higher when the proportions of the age groups(I+Ⅱ+Ⅲ)was highar，and lower when that of the age groups (Ⅳ + Ⅴ)were higher.

Key words: Striped field mouse (Apodemus agrarius ), Ratlike hamster (Cricctulusiton), Striped hamster (CricetMus barabensis), Population dynamics, Populalion age composition