Table 2.

The eight models of chromosome number evolution implemented in the software of Mayrose et al. (2010), indicating the considered parameter estimates (δ, λ, ρ, μ, δ₁, λ₁), the number of parameters included, and, in the case of μ, with which condition

Model	δ	λ	ρ	μ	δ1	λ1	No. of parameters
Mc1	+	+	+	–	–	–	3
Mc2	+	+	+	ρ = μ	–	–	3
Mc3	+	+	+	ρ ≠ μ	–	–	4
Mc0	+	+	ρ = 0	μ = 0	–	–	2
Ml1	+	+	+	–	+	+	5
Ml2	+	+	+	ρ = μ	+	+	5
Ml3	+	+	+	ρ ≠ μ	+	+	6
Ml0	+	+	ρ = 0	μ = 0	+	+	4

Mc indicates models with constant rates, and Ml models that include linear rate parameters (δ₁, λ₁). Zero indicates the respective null model.