Bivariate correlations between independent variables and pathogen number and prevalence index, by latitude zone.

Note. Table shows Spearman's rank order correlation coefficients except for mean annual precipitation, where the correlation is based on the adjusted of a third-degree polynomial regression (no significance values are given for high latitudes because of poor fit diagnostics). Sample sizes for low/high latitudes: temperature 107/73, precipitation 111/75, precipitation dryest month 107/73, habitat diversity 97/75, density 109/75. Habitat diversity calculated at 150 miles radius; the correlation was slightly less at 100 miles.Bivariate correlations between independent variables and pathogen number and prevalence index, by latitude zone.