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The species richness of 500 m elevational bands versus the estimated date (Myr ago) when the elevational band was first colonized, for tropical bolitoglossine salamanders in MesoAmerica, using (a,c) the oldest colonization of each elevational band, (b,d) the summed ages of each colonization of each band, (a,b) the reconstructed elevational midpoint of each species, and (c,d) the reconstructed minimum elevation of each species. Both variables are natural log-transformed.
