Combined graphical representation of principal coordinates (scatter plot) and STRUCTURE (histogram) analyses of 561 shortnose sturgeon (<i>Acipenser brevirostrum</i>) from 17 locations along the North American coast, surveyed at 11 polysomic microsatellite DNA loci.

<p>For the STRUCTURE histograms, each individual is represented by a single vertical bar, broken into <i>k</i> colored segments, the length of which is proportional to the membership fraction in each of the <i>k</i> clusters. Black lines partition the river samples.