Environmental data
To estimate the amount of light filtered through the forest canopy, we took hemispherical photos with a 180Âș fisheye lens at the location where each lizard was first observed. Canopy photos were analyzed in Hemispherical_2.0, a macro for ImageJ, which calculates the percentage of pixels that are open sky (BeckschĂ€fer, 2015).
We characterized environmental variation using Geographic Information System (GIS) climate layers interpolated from average monthly climate data from weather stations with a spatial resolution of about 1 km2 (WorldClim database; Hijmans et al., 2005). For each sampled locality, we extracted two bioclimatic variables that have been considered important for explaining dewlap color variation in anoles: annual precipitation and annual mean temperature (Williams, 1974; Ng et al., 2013a; Driessens et al., 2017).