Figure 4: Lowland species abundance and richness across elevation. (a) Abundance of all lizard individuals in plots across elevations, evaluating only species that have maximum abundances <700m. When discounting the highland fauna, Hispaniola has fewer individuals at middle elevations, though total abundance is still equivalent between islands near sea level. Compare to Fig. 2a, analyzing all species and showing equivalent abundance profiles by elevation across islands. (b) Species richness in plots, evaluating only lowland species. Removing the highland species yields extremely similar alpha-diversity trajectories between islands, suggesting that differences in species richness trajectories across islands observed in Fig. 2b can be attributable to the presence of the highland fauna on Hispaniola. Definitions of lines, shaded regions, and points are the same as in Fig. 2. Note that both panels depict models with linear and quadratic effects of elevation and full interactions with island identify though only the effect of elevation was significant after backwards model selection for lowland species richness.