Figure 2. Change of bacterial composition along the digestive tract of 5th-instar larvae of artificial food-feeding S. littoralis.

(a), The structure of the alimentary canal. The digestive tract was cut into three segments (I, II, and III) for sampling as indicated by the dotted lines. (b), Relative abundance of bacteria in the three segments revealed by cloning and sequencing. (c), Rarefaction curves of the bacterial diversity in gut section I and section III.