Niche overlap between each pair of Amazonian and the Atlantic sister orchid-bee species obtained through Broennimann et al.'s (2012) framework.

A) Niche overlap between the Amazonian El. meriana (red) and the Atlantic El. atleticana (blue). B) Niche overlap between the Amazonian El. bombiformis (red) and the Atlantic El. niveofasciata (blue). C) Niche overlap between the Amazonian Ef. ornata (red) and the Atlantic Ef. atlantica (blue). D) Niche overlap between the sympatric but unrelated Amazonian Eulamea species, El. bombiformis (red) and El. meriana (blue). E) Niche overlap between the sympatric but Atlantic Eulaema species, El. atleticana (red) and El. niveofasciata (blue). F) Niche overlap between the allopatric and unrelated Amazonian El. meriana (red) and the Atlantic El. niveofascita (blue). G) Niche overlap between the allopatric and unrelated Amazonian El. bombiformis (red) and the Atlantic El. atleticana (blue). The solid red and blue thin lines correspond to 100% of the available (background) environment for each species considered in the analyses. Red and blue shadings surrounded by thick lines correspond to the density of occurrences of each species per grid cell.