The latitudinal diversity gradient in South American mammals revisited using a regional analysis approach: The importance of climate at extra-tropical latitudes and history towards the tropics
Fig 2
Plot of b values and overall effect sizes of environmental variables and phylogenetic diversity (AvPD) on taxonomic richness (TR), quantified in tropical and extra-tropical high R2 areas.
The box plot shows the distribution of mean b values in high R2 areas. For each high R2 area depicted in Fig 1 we calculated the mean b value as the average b values obtained in GWR for each high R2 110 km x 100 km cell. The complete list of mean b values is in S2 File. The red dots are the overall effect sizes and the red bars indicate their confidence interval. Overall effect sizes (Fisher´s Z-transfrom, Zr: [66]) took into account differences in the size of high R2 areas, and were estimated using MetaWin v.2 [67]. Beta coefficients greater than 1 were set at 0.99 for the calculations of effect sizes. TEMP = mean annual temperature, PREC = annual precipitation, ALTstd = standard deviation in elevation, TEMPr = temperature range, PRECcv = the coefficient of intra-annual variation in precipitation, AvPD = phylogenetic diversity.