Fig. 5From: Coevolution Between Food-Rewarding Flowers and Their PollinatorsCovariation in the length of the proboscis of the nemestrinid fly P. ganglbaueri and two plant species that it pollinates, Z. microsiphon, the main nectar source for the flies, and D. nivea, a nonrewarding orchid which tracks the evolution of the fly proboscis length. Values represent means for various populations in the Drakensberg Mountains of South Africa (see Fig. 3). Redrawn from Anderson and Johnson (2008, 2009)Back to article page