Figure 1.
Standard cross-cultural sample locations.
Figure 2.
Separate regression lines for mainland and island locations.
Figure 3.
Pathogens by natural log of mean annual temperature (c).
Regression lines in the upper graph are subset by mainland vs. island locations. Regression lines in the lower graph are subset by locations with frost-free climates vs. those with one or more frost months.
Figure 4.
Pathogen prevalence index by mean annual precipitation.
The regression line is a third-order polynomial.
Figure 5.
Pathogens by seasonal dry extremes, controlling for latitude.
Dry extremes are measured by the lowest precipitation in the dryest month, logged. Regression with 95% confidence limits.
Table 1.
Pathogen-specific correlations.
Figure 6.
Pathogen prevalence index by density and residential mobility.
Points have been jittered to avoid overlap. Population density is a nonlinear ordinal scale based on persons per sq. mi; see the methods section for density and mobility codes.
Table 2.
Final regression model for predictors of the pathogen prevalence index and number of pathogens.
Table 3.
Bivariate correlations between independent variables and pathogen number and prevalence index, by latitude zone.
Figure 7.
Pathogens by Island Area (tropical islands only), with loess curves.