Table 2. Polymorphism, linkage disequilibrium and recombination rate from re-analysis of various conifer gene data sets.

Species	Referencea	No. of genes	No. of sitesb	No. of segregating sites	No. of informative sites	No. of pairwise site comparisons	No. of significant pairwise site comparisons by Fisher's exact test (% frequency)c	Mean r2	Distance where expected r2 is half the initial value (nucleotides)	Distance where expected r2 is 0.20 (nucleotides)	Recombination rate RM per informative sited	Recombination rate ρ per sitee
Picea glauca	This study	105	68 894	1476	1007	8314	897 (10.8%)	0.19	65	87	0.070	0.0181
Picea abies	(1)	22	15 871	—	140	1 411	76 (5.4%)	0.24	75	99	—	0.0185
Pinus taeda	(2)	19	9 864	199	142	834	193 (23.1%)	0.30	411	586	—	0.0168
Pinus sylvestris	(3)	16	13 251	—	100	592	110 (18.6%)	0.21	68	91	—	0.0283
Pseudotsuga menziesii (var. menziesii)	(4)	121	59 173	933	—	2 837	866 (30.5%)	0.38	>1100f	∼700g	—	0.0039

^a(1) Heuertz et al. (2006); (2) González-Martínez et al. (2006b); (3) Pyhäjärvi et al. (2007); (4) Eckert et al. (2009a).

^bExcluding gaps and missing data.

^cNumber of tests after Bonferroni's correction.

^dR_M is the minimum number of recombination events (Hudson and Kaplan, 1985) divided by the number of informative sites.

^eρ is the maximum-likelihood estimator of the recombination parameter based on independent linked pairs of sites (Hudson, 2001).

^fData reported by Eckert et al. (2009a).

^gThe exact distance could not be re-estimated. However, based on the reported relationship between r² values and the distance between sites, the distance for r²=0.20 could be estimated from sliding windows of 50 bp. For pairs of sites separated by 700–750 bp, the average r² value was 0.20.