Results of the bivariate and multiple regression analysis.

The dependent variable was population density; the predictor(s)
of each case are listed in the first column. The analysis were
carried out at the FPU scale, for the whole globe, and then
separately for each climate zone (grouped by spatially dominant
climate zone in a FPU). Note: dwland
stands for land distance to water, prec for precipitation, and
temp for temperature.
*: p<0.05;
**: p<0.01;
***: p<0.001.