Geographic mosaic of partnerships between Stegastes nigricans and Polysiphonia algae in the Indo-West Pacific. The circle graphs indicate the biomass composition of algal species in territories of S. nigricans at our study sites. Colors and patterns correspond to the clades and species of Polysiphonia shown in Fig. 1, and grey indicates the presence of algae other than Polysiphonia spp. Light blue dots and black closed circles indicate the areas of coral reefs and S. nigricans, respectively.