关键词: 肾脏指数, 相对髓质厚度, 布氏田鼠, 达乌尔黄鼠

Abstract: The relative medullary thickness(RMT)of Brandt's voles and ground squirrels are 7.38±0.48 and 5.76±0.56 respectively. There is significant difference between two mean body masses(BM) (P<0.01). We convert RMT to RMT/BM^-0.181 to decrease effect of body size. The converted RMTs of Brandt's voles and ground squirrels are 3.65±0.42 and 2.23±0.18 respectively. The converted RMT of voles is larger than that of ground squirrels significiantly (T=8.38, P<0.01). This indicates that the capacity of concentrating urine of Brandt's voles is greater than that of ground squirrels. But in fact ground squirrels could distribute the arid areas where Brandt's voles could not live. Author suggests that ground squirrels hiberate to avoid these water stress periods(late autumn and early spring).