Recombination, cryptic clades and neutral molecular divergence of the microcystin synthetase (mcy) genes of toxic cyanobacterium Microcystis aeruginosa

Table 2 Analyses of interlocus recombination

		n ¹	I _A ^S2	Portion of significant congruence³
Total	All	118	0.656*
	ST	51	0.188*	6/6
Group A	All	84	0.680*
	ST	30	0.193*	6/6
Group B	All	29	0.359*
	ST	17	0.064	0/6

¹ Number of strains.
² Standardized index of association [26]. *, P < 0.01.
³ Maximum likelihood analysis of tree topology congruence based on Feil et al. [31]. The log-likelihoods of 200 random trees were calculated based on the sequence data of each locus, and compared to those of the ML tree topologies of the other two loci. Log likelihood scores higher than those of 99th percentile of 200 random tree topologies are "significantly congruent" (P < 0.01), suggesting the low rate or lack of recombination. Thus, the lower value of the portion of significant congruence indicates the higher rate of recombination.

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