Latitudinal trends in the amount of variation in American palm species richness locally explained by water and energy (OLS).

Values are slopes of ordinary least squares regressions on standardized variables. Positive signs indicate increase with absolute latitude. Bold: p<0.05.

所有数值均为经标准化处理变量的普通最小二乘回归（ordinary least squares）斜率。回归系数为正代表变量随绝对纬度升高而增大。加粗格式的数值对应的显著性水平p<0.05。