Evidence for GC-biased gene conversion as a driver of between-lineage differences in avian base composition

Table 1 Correlations between standard deviation in GC and median GC and recombination

Correlation with recombination	Standard deviation of GC		Mean GC
Chicken
GC3	rho = 0.2432	P = 2.3e-09	rho = 0.3283	P = 3.0e-16
GC3 ‘homogenous’	rho = 0.2136	P = 0.0016	rho = 0.2665	P = 7.6e-05
GC i	rho = 0.2371	P = 2.0e-05	rho = 0.3761	P = 4.4e-12
Zebra finch
GC3	rho = 0.2915	P = 4.7e-11	rho = 0.2689	P = 1.4e-09
GC3 ‘homogenous’	rho = 0.2009	P = 0.0054	rho = 0.2027	P = 0.005
GC i	rho = 0.1663	P = 0.0121	rho = 0.3636	P = 1.6e-08

Intronic GC was calculated only for windows with a minimum of 10 introns present to avoid noise owing to low numbers of sites.

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