Table 2.

Results of Factorial Correspondence Analyses on Relative Codon Usage in Buchnera and in E. coli Orthologs

		Inertia	CAI_Eco	GC₁₂	CG₃	AT_s3	GC_s3
B-aps	z1	6.1	−0.11^*	−0.24^**	0.06	0.63^**	−0.56^**
	z2	4.3	0.14^**	0.16^**	0.29^**	−0.07	0.01
B-sgr	z1	7.9	−0.11^*	−0.21^**	0.01	0.71^**	−0.54^**
	z2	3.8	0.14^**	0.13^*	0.09	0.11^*	−0.31^**
B-bpi	z1	22.9	−0.09	−0.17^**	0.20^**	0.82^**	−0.91^**
	z2	3.3	−0.05	−0.11	0.05	−0.08	−0.08
E. coli	z1	24.0	−0.96^**	0.10	0.01	0.19^**	0.57^**
	z2	5.8	−0.05	0.10	−0.82^**	0.09	−0.08

For each of the first two axes of the FCA (z1 and z2), % of total inertia, and nonparametric (Spearman's) correlation coefficients between z-values and CAI-Eco (codon adaptive index of the E. coli ortholog), GC content, AT skew (ATs) and GC skew (GCs) indices indicating codon positions. Bold values are significant at the 0.05 level (^*) or at the 0.01 level (^**) after Bonferroni's correction for multiple tests (k = 5); Sokal and Rohlf (2003).

Mutational and Selective Pressures on Codon and Amino Acid Usage in Buchnera, Endosymbiotic Bacteria of Aphids