Table 1 Genetic diversity indices for microsatellite data, mtDNA RFLP data and mtDNA RFLP haplotype frequencies

River	ID	N	Microsatellite diversity			mtDNA RFLP diversity		mtDNA RFLP haplotypes				Regional group
			A_r	H_o	H_e	Haplotype diversity	Nucleotide diversity	AAAA	AABA	BBBB	BBBA
Ulla	1	40	8.43	0.70	0.72	0.000	0.00000	0.00	0.00	1.00	0.00	Spain/Spain
Sella	2	41	11.87	0.81	0.81	0.337	0.00883	0.05	0.00	0.80	0.15	Spain/Spain
Scorff	3	30	11.26	0.80	0.79	0.646	0.01774	0.50	0.27	0.00	0.23	France/France
Ellé	4	46	11.64	0.82	0.78	0.684	0.01949	0.22	0.48	0.09	0.22	France/France
Léguer	5	28	12.62	0.81	0.79	0.577	0.01531	0.61	0.25	0.04	0.11	France/France
Sée	6	31	11.12	0.81	0.80	0.475	0.01368	0.71	0.16	0.03	0.10	France/France
Itchen	7	29	7.79	0.74	0.75	0.616	0.01336	0.00	0.14	0.34	0.52	UKSouth/UK
Avon	8	23	7.00	0.73	0.81	0.557	0.02841	0.61	0.04	0.30	0.04	UKSouth/France
Dart	9	38	10.96	0.83	0.88	0.495	0.01016	0.03	0.03	0.66	0.29	UKSw/Spain
Fowey	10	36	11.48	0.81	0.82	0.708	0.02697	0.19	0.31	0.42	0.08	UKSw/UK
Camel	11	30	12.68	0.83	0.84	0.690	0.02170	0.03	0.43	0.30	0.23	UKSw/UK
Taw	12	32	12.57	0.84	0.87	0.692	0.02186	0.13	0.13	0.47	0.28	UKSw/UK
Usk	13	30	12.58	0.84	0.86	0.632	0.01869	0.13	0.10	0.20	0.57	UKSw/UK
Teifi	14	27	13.38	0.84	0.85	0.732	0.02600	0.22	0.11	0.41	0.26	UKSw/UK
Ribble	15	25	11.29	0.82	0.84	0.530	0.01498	0.04	0.36	0.00	0.60	UKNw/UK
Ayr	16	32	11.36	0.83	0.83	0.627	0.02054	0.00	0.34	0.50	0.16	UKNw/UK
Creed	17	35	11.90	0.83	0.83	0.570	0.01402	0.00	0.14	0.60	0.26	UKNw/UK
Moy	18	29	11.74	0.82	0.85	0.680	0.02004	0.14	0.07	0.34	0.45	UKNw/UK
Laune	19	47	12.11	0.83	0.82	0.531	0.01144	0.02	0.09	0.26	0.64	UKNw/UK
Barrow	20	37	13.33	0.86	0.86	0.739	0.02261	0.14	0.22	0.27	0.38	UKNw/UK
Boyne	21	36	11.57	0.82	0.80	0.386	0.00526	0.00	0.00	0.75	0.25	UKNw/Spain

Abbreviations: A_r, allelic richness; H_e, expected heterozygosity; H_o, observed heterozygosity; ID, population ID for Figure 1; mtDNA, mitochondrial DNA; N, number of salmon; Nw, northwest; RFLP, restriction fragment length polymorphism; Sw, south west.
mtDNA RFLP composite haplotypes were derived from restriction enzymes AvaII, HaeIII, HinfI and RsaI. Two regional assignments are listed for each population: the first regional assignment classifies a population according to the microsatellite analysis, and the second is based on the mtDNA analysis.

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