Figure 1.
Distribution of the world's languages.
Each point represents the center of the range of one language.
Figure 2.
Language-range area distribution.
(A) Untransformed range areas (note: y-axis is log(frequency)). (B) Log-10 transformed range areas. (C) Deviation from normal following log-10 transformation.
Table 1.
Spearman rank correlations between language-range sizes and latitude and language richness.
Figure 3.
Global relationships between language range area, language range extent, language richness, and latitude.
(A) Changes in median language-range area (determined with mid-point method with 2 degree bands) at different latitudes (Correlation coefficient (using absolute latitude and Spearman's rank correlation): 0.63) (B) Changes in median range extent (determined with mid-point method and 2-degree lat bands) of language at different latitudes (Correlation coefficient (using absolute latitude and Spearman's rank correlation): 0.69) (C) Latitudinal gradient in language richness (number of languages per 2-degree latitude band) (D) Median language-range area versus log-language richness.