关键词: 中华姬鼠, 社鼠, 食性, 肠道

Abstract: We conducted a field survey on the sympatric Apodemus draco and Niviventer confucianus in 2008 in Fengtongzhai Nature Reserve,China to examine the annual diet composition of small rodents and its effects on their intestinal lengths. The results indicated that,for both rodents,seed was the primary component on their annual diet,and that their diet composition varied significantly across seasons. Of the four categories of diet components,percent of seed ingested had a significant positive influence upon the length of the small intestine,and the influence of the remaining diet components varied depending on the species. We believe that the difference of diet composition for the two species across seasons was
likely related to the availability of food resource in the reserve,and the change of digestive tract length perhaps play an important role in the adaptation to seasonal energy demand and food resources. Therefore,possible interspecific difference should be considered when investigating physiological strategies adaptive to different types of food resources for different species in future research.

Key words: Apodemus draco, Food habit, Intestine, Niviventer confucianus