Abstract: From April 2008 to May 2009, 155 individuals of geckoes (Teratoscincus roborowskii) were collected from the Turpan Eremophytes Botanic Garden of Chinese Academy of Sciences in Turpan Basin, Xinjiang Uygur Autonomous Region, aimed to study their sexual dimorphism and diet composition. The geckoes were maintained separately for a short time to collect their fecal samples for diet analysis, and their morphological characters were measured. All the geckoes were marked by toe clipping, and reintroduced to the collected locality after the fecal collection and morphological measurement. No significant differences were observed in the morphological characters between male and female juveniles. At mature stage, the males had wider head, while the females had larger venter size. An isometric growth pattern with the increase of snoutvent length was showed in the head length of all the individuals and in the head width of the males, but the growth rate of head width declined gradually with the ontogeny of the females. T. roborowskii  mostly ate arthropod and Capparis spinosa fruit. The food niche width was 4.15 in April-May, 4.23 in June-July, and 4.48 in August-September, and the food niche overlap was the highest between June-July and August-September.

Key words: Hexi oasis, Ecological footprints, Ecological capacity, Ecological surplus/deficit, Sustainable development