marginally significantP = 0.052
In addition, we found that the pure effect of vertical distance ([Dist|Env+BF]) is marginally significant ( adjusted R 2 = 8.9%, P = 0.052) ( Table 1 ), whereas the pure effect of stratification ([BF|Env+Dist]) is not significant ( adjusted R 2 = 25%, P = 0.15) ( Table 1 ).