Genetic structure among populations based on microsatellites analysis in <i>N</i> = 272 individuals from 10 populations.

<p>The top panel is a bar plot showing the assignment scores of individuals by STRUCTURE with <i>K = 2</i> with yellow representing <i>P. thermalis</i> and <i>P. sulphuraria</i> as a cluster from the Puyacatengo and Pichucalco sulfidic drainages and blue representing <i>P. m. mexicana</i> from non-sulfidic sites in the same drainage. The bottom panel is a bar plot showing the assignment scores clustering at <i>K = 7</i>, the second most likely number of distinct groups.