Fig. 4
From: Gene flow and introgression are pervasive forces shaping the evolution of bacterial species
Introgression between species and MEPS. a Introgression scores (Si) between candidate and reference species that were not reclassified as part of the same species. Si represents the fraction of the core genome that shows evidence of introgression between the candidate species and at least one genome of the reference species. Introgressed regions were defined as 100bp fragments that were more similar to the candidate species than at least one of the genomes of the reference species. Only introgressed fragments with ≥95% sequence identity between the candidate and reference species were considered as introgressed. Coefficient correlation ρ and P-value were estimated with Spearman’s rank correlation test. b Simulated frequency of identical Minimal Efficient Processing Segments (MEPS) expected relative to sequence identity. Different lines represent MEPS ranging from 20 to 90bp. c Introgression scores (Si) computed for recent introgression events. Si was computed as described above between candidate and reference species that were not reclassified as part of the same species. Only introgressed fragments presenting 100% sequence identity between the candidate and reference species were considered as introgressed. The red line corresponds to a MEPS size of 40bp and the dashed blue line represents the expected number of 100bp identical fragments for a pair of genomes