Fig. 4. Probabilities for 448 fish from three NAFO Subareas (0, 1, 4) to be assigned to any of K = 2 clusters by STRUCTURE. Each individual is represented by a vertical line, which is partitioned into two coloured segments representing the estimated membership fraction of each sample in two clusters. Dark gray corresponds to Cluster 1 of Fig. 4, and light gray corresponds to Cluster 2. Black lines separate fish collected at different time or location (refer to Table 1 for sample abbreviations). Northern or Southern origin of the samples within the Northwest Atlantic is indicated by the Baffin Bay and Davis Strait labels.