Fig. 3

Genome-sequenced proportion of prokaryotic taxa from global or different environment types. a As the number of samples increases, the P_{OTU (100%)} shows an exponential declining trend and finally stabilizes at 2.1%. A random selection of 1000, 2000…, 9000 samples was performed 10 times for each group to calculate the mean value and standard deviation. b Significant difference of P_OTU among environment types. The red point is P_{OTU (100%)}, the blue point is P_{OTU (98.6%)}, and the orange point is P_{OTU (97%)}