Abstract: In this study, the body-turning behaviors of Bradybaena ravida ravida were studied by recording the duration of the snails resuming their original posture after being put upside down. The effects of the factors such as snail body weight, environmental temperature, illumination intensity, and the time of feeding and starvation on the body-turning duration were also studied. The bodyturning duration increased with the increase of snail body weight, illumination intensity, and starvation time, but decreased with the increase of environmental temperature and feeding time. The durations of the bodyturning of groups Ⅳ and Ⅴ (snail body weight was 0.7-0.9 g and 0.9-1.2 g, respectively) were significantly longer than those of groups Ⅰ, Ⅱ, and Ⅲ (snail body weight was 0.1-0.3 g, 0.3-0.5 g and 0.5-0.7 g, respectively) (P<0.01), and the duration of body-turning of groupⅠ was significantly shorter than that of group Ⅲ (P<0.05). At higher temperature and weaker illumination intensity from electric incandescent lamp (204 lx), the body-turning durations of groups Ⅰ, Ⅲ, and Ⅴwere significantly shorter than those at lower temperature and stronger illumination intensity (493 lx). The body-turning durations of groups Ⅰ and Ⅴ that starved for longer time were significantly longer than those starved for shorter time. When fed for longer time, the body-turning durations of groups Ⅲ and Ⅴ were significantly shorter than those fed for shorter time.

Key words: water shortage, stomatal aperture, Kranz anatomy, water desorption., H₂O₂