Variations in the number of C. elegans in the bacterial zone at different time points.

Results are shown as box plots. a, b, c, d, e, f, g, and h represent 1, 2, 4, 8, 12, 24, 36, and 48 hours, respectively. B. a, V. s, B. m, P. f, E. c denotes B. amyloliquefaciens JX1, Variovorax sp. JX14, B. megaterium JX15, P. fluorescens Y1 and E. coli OP50, respectively (these abbreviations used in the following figures show the same meaning).