Fig. 3.

The geographical mosaic of selection that leads to divergence in floral traits that characterizes pollination ecotypes. (A) The fitness of ecotypes 1 and 2 depends on the area in which they occur. Ecotype 1 is adapted to the conditions in region B, while ecotype 2 is adapted to the conditions in region A. (B) Several factors may determine divergent selection regimes between regions A and B. While all factors ultimately affect the local availability and/or efficiency of pollinators, the distribution of pollinators is not the only determinant. The evolutionary response depends on the change that is caused by differences between regions A and B. In this scheme the evolution to self-pollination as a response to pollen limitation is not considered, although it is a potential outcome under each scenario.