Table 1.

Characteristics of 21 sampling locations of three-spined stickleback (Gasterosteus aculeatus) populations in Belgium, genotyped at six microsatellite loci.

Population	Code	Basin	Latitude	Longitude	HE	HO	AR
Mechelen	S4a	Nete	51°03.734′	4°27.588′	0.83	0.83	10.34
Werchter	S5a	Dijle	50°57.806′	4°43.276′	0.78	0.77	9.46
Vaalbeek	S5b	Dijle	50°49.466′	4°40.105′	0.65	0.63	6.22
Aarschot	S6a	Demer	50°58.831′	4°50.898′	0.79	0.76	8.20
Zelem	S9a	Demer	50°57.761′	5°05.431′	0.73	0.72	7.66
Boutersem	S9b	Demer	50°49.506′	4°49.405′	0.66	0.68	5.78
Zoutleeuw	S9c	Demer	50°51.310′	5°6.531′	0.78	0.75	8.89
Hoegaarden	S9d	Demer	50°47.355′	4°55.150′	0.79	0.77	9.471
Landen	S9e	Demer	50°46.613′	5°00.441′	0.74	0.76	6.50
Gingelom	S9f	Demer	50°45.882′	5°10.842′	0.69	0.74	5.35
Stevoort	S9g	Demer	50°55.393′	5°13.823′	0.78	0.80	7.02
Mechelen-Bovelingen	S9h	Demer	50°44.904′	5°16.350′	0.55	0.56	3.67
Borgloon	S9i	Demer	50°48.318′	5°24.287′	0.44	0.43	3.46
Kortenaken	S9j	Demer	50°52.513′	4°59.953′	0.75	0.74	7.74
St-Truiden	S9k	Demer	50°50.702′	5°10.900′	0.80	0.81	7.32
Wellen	S9l	Demer	50°50.312′	5°20.196′	0.77	0.78	7.28
Kermt	S11a	Demer	50°57.900′	5°14.043′	0.73	0.72	7.56
Diepenbeek	S12a	Demer	50°55.409′	5°27.509′	0.79	0.73	7.59
Bilzen	S13a	Demer	50°53.749′	5°29.290′	0.81	0.83	7.73
Zutendaal	S13b	Demer	50°54.539′	5°34.006′	0.64	0.66	4.37
Alt-Hoeselt	S14	Demer	50°50.479′	5°30.031′	0.79	0.71	7.39

H_E, expected (unbiased) heterozygosity; H_O, observed heterozygosity; AR, allelic richness standardized for 18 diploid individuals.