Fig. 2.
Differentiation in odor bouquets between orchid mimics (squares) and their specific female bee models (circles) sampled in sympatry in southern France (filled symbols) and southern Italy (open symbols). CDF plot of biologically active odor compounds (relative proportions, in percentage of the total odor blend): the analysis shows that the relative proportions of the orchids' floral odor differs significantly from the female bees' sex pheromone sampled in sympatry. The discriminatory ability of the CDFs was high, as they explained 93.9% of the total odor variance among samples (63.2% and 30.7%, respectively; Wilks' λ values: Wλ1 = 0.002 and Wλ2 = 0.038, associated P1 and P2 < 0.0001; canonical correlation values: Cc1 = 0.973; Cc2 = 0.947). Overall, 97.5% of all cross-validated samples were assigned correctly to their species/population by the two CDFs.