Fig. 7. Mean defecation cycle and residence time of P. pacificus and C. elegans. (A) Mean defecation time (seconds) of C. elegans and P. pacificus exposed to E. coli OP50, Xenorhabdus sp. and Bacillus sp. 2. Error bars represent ±1 s.e.m. (B) Mean residence time (seconds) of E. coli OP50 and Bacillus sp. 2 mixed with fluorescent beads, in C. elegans and P. pacificus. Bars represent ±1 s.e.m.