Tree Species Diversity in Logged Rainforests

C. H. Cannon et al. report an increase in tree diversity 8 years after selective logging in Borneo (1). These results accord with theo-retical expectations (2) and with previous observations in Borneo and elsewhere (3); however, the significance of these findings is debatable. Cannon et al. detect increased stem diver-sity with the use of a “species-to-stems ” ratio. The comparisons between logged and un-logged forests are, however, confounded by differences in stem counts per sample be-cause species-individual ratios decline with increasing stem numbers in any community (4). Cannon et al. note the value of rarefac