Table 4.

Results of the Likelihood-ratio test comparing models differentiating λ and μ to models with equal birth-death parameters

	Model	λ Background x 10 3	λ Sternorrhyncha x 10 3	μ Background x 10 3	μ Sternorrhyncha x 10 3	-ML	# Parameters	Likelihood ratio	p -value
APC	Single λ	1.2177	-	-	-	34.31	1	0.06	0.843
	Single λ + μ	1.2533	-	1.0615	-	34.28	2
AAAP	Multiple λ	0.3631	6.849	-	-	35.01	2	12.51	0.002
	Multiple λ + μ	2.88 x 10-9	1.110	0.6341	6.03 x 10-3	28.76	4

For APC, the estimated parameters are global across the phylogeny. For AAAP, the parameters were rates were allowed to shift in sternorrhynchan species. Data generated with CAFE. λ represents the probability of gene duplication/loss (Single/Multiple λ), or gene duplication only (Single/Multiple λ + μ) per gene per million years. μ represents the probability of gene loss per gene per million years.