Figure 1.
Light treatments. A) Overhead irradiance spectra of Lake Malawi (gray), Full Spectrum (blue), and Red (red) environments. To facilitate comparison, spectra were normalized to their values at 487 nm and y-axis was truncated. The Full Spectrum peaked at 9.6 at 546 nm and the Red peak was 8.8 at 611 nm. B) Absorbance spectra of M. zebra visual pigments. C) Computed quantum catch by visual pigments of Lake Malawi, Full Spectrum, Red, and Red Inverted spectra, taking M. zebra lens transmittance into account. Overhead irradiance was measured 3 m below the surface at Thumbi West Island, Lake Malawi.
