Evidence of past forest fragmentation in the Congo Basin from the phylogeography of a shade-tolerant tree with limited seed dispersal: Scorodophloeus zenkeri (Fabaceae, Detarioideae)

Table 1 Genetic diversity parameters of the six inferred genetic clusters and for the main bioregions (Lower Guinea and Congolia) in Scorodophloeus zenkeri populations

Cluster	n	NAe	AR (k = 26)	He	Ho	Fi	Sp (± SE)	SR (± SE)
LG northwest	22	2.32	4.53	0.43	0.36	0.16	/	0 ± 0.144
LG east	83	3.58	5.36	0.61	0.50	0.18	0.010 ± 0.002	0.001 ± 0.047
LG west	46	3.20	5.22	0.63	0.49	0.23	0.013 ± 0.005	0.112 ± 0.123
LG southwest	66	3.24	5.49	0.55	0.48	0.13	0.009 ± 0.002	0.050 ± 0.088
Congo west	18	3.87	4.83	0.58	0.54	0.07	/	0 ± 0
Congo east	131	2.71	4.42	0.52	0.48	0.09	0.003 ± 0.001	0 ± 0.006
All clusters	465	4.20	6.29	0.68	0.49	0.28	/	/

Bioregion	n	NAe	AR (k = 126)	He	Ho	Fi
Lower Guinea	204	3.99	10.06	0.66	0.47	0.29
Congolia	76	3.22	6.51	0.58	0.49	0.16

n number of individuals analysed, NAe effective number of alleles [26], AR (k = x) allelic richness or number of alleles among x gene copies, He expected heterozygosity, Ho observed heterozygosity, Fi individual inbreeding coefficient, Sp statistic used to quantify the decay of kinship-distance curves within the best represented clusters (minimum n = 46) based on the regression slope of pairwise kinship coefficients on the logarithm of geographic distances [27], SR selfing rate estimate [28], SE standard error. Fi was significantly larger than 0 for all clusters, except for ‘Congo west’. The selfing rate estimate was non-significant for all genetic clusters

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