Variation in underwater light environments between sampling locations and species-specific depth ranges. For each location, plotted values derive from fitting an exponential function to all measured orange ratios at that location. (a) The increase in orange ratio with depth for the five sampling locations. Ruti and Makobe show virtually identical curves. (b) The orange ratios at the species- and island-specific depth ranges. Each symbol represents the orange ratio at a specific water depth (in 0.5 m increments) where the species occur.