关键词: 棕色田鼠, 洞系, 社会组织

Abstract: The colonial structure of mandarin voles (Microtus mandarinus) varies from month to month. Mandarin vole had a large family size which consisted of several adult males and females and many offsprings in April and October. From June to September it consisted of one adult male and one adult female and had offsprings or not. So social organization of mandarin voles consisted of communal groups male-female pairs and single female breeding unit. Male-female pairs displayed behavioral traits associated with monogamy, including sharing a common nest and home range. In April and October, there are more communal groups (60%, 61.5 %). In June and September, there are more male-female pairs (80%, 75%). The percents of communal groups were positively correlated with the densities of the voles and the percents of male-female pairs were negatively correlated with the densities of the voles. The burrow index (number of voles /number of burrows) were different in different seasons. The burrow index were positively correlated with the density of voles. So it infers that the changes of the colonial structure of voles were caused mainly by reproduction and joining of new members.

Key words: Microtus mandarinus, Social organization, Burrow system