Table 2.

Analysis of molecular variance (AMOVA) for Santa Cruz G. fortis. Sampled birds represent two beak-size classes (small and large) from the three collection sites (Academy Bay, Borrero Bay and El Garrapatero). These analyses were based on 10 polymorphic microsatellite loci (i.e. excluding Gf10). Levels of significance were extracted after 10 000 permutations, as implemented by Arlequin v. 3.1.

source of variation	sum of squares	variance components	percentage of variation	p-value
sites nested within beak-size classes
between size classes	23.249	0.04373	1.11	0.096
among sites within size classes	19.734	0.00706	0.18	<0.001
within sites	3786.277	3.87145	98.70	<0.001
beak-size classes nested within sites
among sites	12.238	−0.01902	−0.49	0.793
between size classes within sites	30.745	0.04602	1.18	<0.001
within size classes	10244.091	3.89103	99.31	<0.001