3.3 Environmental responses of abundant and rare taxa
Environmental threshold analysis indicated that abundant taxa showed a broader range of environmental thresholds than rare taxa for almost all of the environmental and land use types examined (Fig. 3a). Further, Blomberg’s K statistic revealed that abundant taxa exhibited stronger phylogenetic signals for almost all tested variables compared with the corresponding rare taxa (Fig. 3b). In addition, we examined the potential ecological preferences for the top 30 abundant and rare OTUs, respectively, and found that abundant taxa exhibited stronger environmental associations than rare taxa (Fig. 3c). This suggests that closely correlated taxa in the abundant subcommunity exhibited more similar ecological preferences to the measured environmental factors than those in the rare subcommunity.