Fig. 2: Relationship between the distribution of high- and low-Si plant clades and temperature.
From: Convergent evidence for the temperature-dependent emergence of silicification in terrestrial plants
a Global distribution of sampling sites for high- (n = 9972 occurrences, red dots) and low-Si (n = 9990 occurrences, blue dots) plant clades. Data was obtained from GBIF using rgbif package in R. b Temperature range of high- (n = 9972 occurrences) and low-Si (n = 9990 occurrences) plants distributions. The mean annual air temperatures were obtained from CHELSA (chelsa-climate.org). Data are presented as the mean and standard deviation. Differences between groups are compared using two-sided Wilcoxon rank sum test (p < 2.2e−16). Significant differences between the low-Si and high-Si plants are indicated as follows: ***p < 0.001. c The mean ± SD, median, and mode of distribution temperature of high- and low-Si plants.
