Fig. 2From: The consistent difference in red fluorescence in fishes across a 15 m depth gradient is triggered by ambient brightness, not by ambient spectrumIris fluorescence brightness at deep and shallow capture depths. Iris fluorescence brightness of Tripterygion delaisi measured as total photon radiance (photons s−1 sr−1 m−2) (n = 40) in the field. Boxplots show median (horizontal line), upper and lower quartiles (boxes) and ranges (whiskers)Back to article page