Supplementary files S1, S2, S3 and S4

<p>Table S1: Summary of SIMPER results: average concentration of discriminating species in allopatric sites, their contribution (%) to dissimilarity between groups, and the accumulative total (%) of contribution (75% cut-off).</p> <p>Table S2: Table of compounds reported by CG-MS in the complex <em>Bursera bicolor</em> &times; <em>B. glabrifolia.&nbsp; </em></p> <p>Table S3: Summary of SIMPER results: average concentration of discriminating taxa in La Tigra sympatric zone, their contribution (%) to dissimilarity between groups, and the accumulative total (%) of contribution (75% cut-off).</p> <p>Table S4: Summary of SIMPER results: average concentration of discriminating taxa in Quilamula sympatric zone, their contribution (%) to dissimilarity between groups, and the accumulative total (%) of contribution (75% cut-off).</p>