Table 2. AICc scores and ω estimates for various branch-based models assessing heterogeneous selection pressures for rho using Contrast-FEL test.

Model	Descripción	AIC-c	ω estimates
Best-fitting model is in bold.
M0	Random sampling of the branches (null hypothesis)	2 894.19	Background=0.3316, Test=0.2314
M1	Two-ratio model with surface ω and a single ω for cave branches	2 893.46	Surface=0.0869, Caves=0.3481
M2	Four-ratio model considering a single ω for the surface and a different ω for each cave region	2 894.81	Sierra de El Abra=0.4161, Sierra de Guatemala=0.3466, Micos=0.0, Surface=0.1733
M3	Five-ratio model, with a different ω value for each surface lineage and three ω values for each cave region	2 896.02	Sierra de El Abra=0.4173, Sierra de Guatemala=0.3478, Micos=0.0, Surface new lineage=0.291, Surface old lineage=0.0