Results of Mantel tests examining the relationship between change in community composition of songbirds between sites on the gradient and change in either live biomass or detritus mass between sites for each of five years in which we did surveys.

Values represent the correlation, either negative or positive, between community change and environmental change. Values in parentheses are the p-value from significance tests.各数值用于表征群落变化与环境变化之间的正负相关关系。括号内的数值为显著性检验得到的P值（p-value）。