Fig. 2

Abundance of streptomycetes and their phenotypic diversity related to precipitation level and soil type. Streptomycete abundance (a, c) at the level of mean value of colony forming units (× 105 / g soil) on humic acid agar and ISP2 agar, and Streptomyces phenotypic diversity (b, c) as related to annual precipitation and soil type, respectively. Precipitation levels 0–100 mm (very low), 101–400 mm (low), 401–600 mm (moderate) and 601–1000 mm (high). Streptomycete abundance was different between Arenosols and Yermosols (p = 0.048) and Vertisols and Yermosols (p = 0.012) according to one way ANOVA and Tukey test