光周期和高脂食物对横断山区高山姬鼠肥满度的影响

o investigate the roles of photoperiod and high fat diet on relative fatness in Apodemus chevrieri in Hengduan Mountain region, male Apodemus chevrieri were acclimatized to one of 4 regimens, 1) long day and low fat diet, LL; 2) long day and high fat diet, LH; 3) short day and low fat diet, SL; 4) short day and high fat diet, SH. After a 7-week acclimation period, we determined body mass and body size. The relative fatness in Apodemus chevrieri was calculate by empirical formula（K=100W/L3）. The results showed that there were no significant sexual differences with respect to relative fatness; the relative fatness showed no significant differences in the groups with different ages; but changes of relative fatness were significantly affected by photoperiod, but not by diet or the interaction of photoperiod and diet. The variation trend of relative fatness were short-day acclimation group greater than long day acclimation group, thereinto, highest in long day and low fat diet and lowest in short day and high fat diet. The changes pattern on relative fatness of Apodemus chevrieri in different photoperiod and diet were related to their microenvironment such as low latitude, high elevation, lower average ambient temperature and the big change of photoperiod and food resources in Hengduan mountains.