Study area.

<p>The geographic sites where the sampling was performed are numbered from 1 to 10 (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0039223#pone-0039223-t001" target="_blank">Table 1</a>). The circles represent low (white), medium (light blue) and high (dark blue) degrees of urbanization.