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Rod spectral sensitivity variation. (A) Maximum absorbance of rods from 20 individuals from sites with different underwater light spectra. (B) Proportion of vitamin A1 estimated from rod λmax in 20 individuals. Error bars denote 1 s.d. of all the recordings. Filled squares, circles and triangles denote samples from clear water, turbid water and the 6-month treatment, respectively. (C) Boxplots showing the rod spectral sensitivities of samples from different groups.
