16S inter- and intraspecific genetic variation in Malagasy frogs. Variation in the fragment of the 16S rRNA gene (ca. 550 bp) studied herein, (a) within populations, (b) among conspecific populations and (c) among sibling species of frogs in the family Mantellidae from Madagascar. The values are uncorrected p-distances from pairwise comparisons in the respective category. Only one (mean) value per species was used in (a) and (b), even when multiple individuals were compared. Grey bars in (a) and (b) show the mean values from all possible individual comparisons within a species, black bars are the maximum divergences encountered between two individual sequences.