Table 2.

Hierarchical F_ST analyses (AMOVA) by geographic region and ecotype.

		Number of		Variance component			Fixation indices (and probability of H0)
Geographic region*	Ecotype	drainages†ndrainage	sites‡npop	Within sites	Among sites (within drainage)	Among drainages	Sites (FSC)	Drainages (FCT)
Northern	Sea/river-type	5	16	0.281	0.019	0.015	0.06 (<0.001)	0.05 (0.04)
	Lake-type	5	23	0.233	0.070	0.046	0.23 (<0.001)	0.13 (<0.01)
Coastal	Sea/river-type	4	7	0.247	0.105	0.054	0.30 (<0.001)	0.13 (0.33)
	Lake-type	5	29	0.234	0.150	0.035	0.39 (<0.001)	0.08 (0.03)
	Kokanee	4	11	0.124	0.148	0.091	0.55 (<0.001)	0.25 (0.06)
Southern	Sea/river-type	2	4	0.326	−0.013	0.047	−0.04 (0.96)	0.13 (0.25)
	Lake-type	3	15	0.228	0.035	0.039	0.13 (<0.001)	0.13 (<0.01)
	Kokanee	3	13	0.263	0.074	−0.008	0.22 (<0.001)	−0.02 (0.61)

Bold font indicates that the fixation index is statistically > 0.

^*Regions putatively colonized from different glacial refuges (Wood 1995, Wood et al. unpublished data).

^†Drainages are defined as in Table 1 except that the Fraser River drainage was divided between regions 1 (upper) and 2 (lower).

^‡Samples refer to the individual populations in Supplementary Table 1.