Table 1.

Sample sizes and genetic variation within study sites. (Sample size refers to the number of individuals genotyped at seven microsatellite loci. ‘Mean no. alleles’ refers to the observed number of alleles (including null allele), averaged over loci. Avg. H_e is the unbiased estimate of heterozygosity, averaged over loci.)

site	sample size	mean no. alleles	avg. He
D1	43	9.3	0.657
E	40	9.7	0.708
F	41	10.9	0.743
G1	40	11.3	0.698
g2	40	10.6	0.754
I	21	8.7	0.766
J	31	10.1	0.732
K	40	10.9	0.764
L	40	10	0.715
M	38	10.9	0.724
O	12	6.7	0.674
P	39	11	0.751
Q	40	10.6	0.727
R	24	9.3	0.734
S	14	6.9	0.643
Y	13	7.4	0.712
Z1	41	10.1	0.722