Fig. 1.—

Relationship between δ values for whole-genome genetic distances (GD), genomic conservation (synteny, GC), and genomic rearrangements (GR). Rickettsia species were assigned to two categories depending on their host range: wide (with different insect vectors and vertebrate hosts; dark green circles) and narrow (with a single genus insect vector and few vertebrate host; dark red squares). The 24 taxa are projected on the first two PCA axes, which represent 68% and 16% of the total inertia.