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 (BeckschÀfer, 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).