Figure 3. Group membership coefficients derived using the program Structure for 162 zebra finch individuals sorted by stock for (a) K = 2 and (b) K = 5.

The first four stocks correspond to the wild type plumage morph and the second three stocks correspond to the white plumage morph. Each individual is represented by a vertical line partitioned into coloured segments, the lengths of which indicate the posterior probability of membership in each group.