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Visual pigments and the acquisition of visual information

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Figure

Fig. 2. The spectral distribution of downwelling daylight at optically equivalent depthsin very clear water containing little chlorophyll or dissolved organic matter (CraterLake, Oregon) and fresh water containing significant amounts of chlorophyll anddiss
Fig. 3. The relationship between the visual pigments in the rod outer segments offishes and the spectral waveband available for vision in different aquatic environments.The hatched areas of the horizontal bars represent the absorption maxima of visualpigments which would give greatest sensitivity to fishes living in those waters.
Fig. 4. The visual pigments present in the rods and cones of various species of fishfish from fresh water, which is most transparent at longer wavelengths
Fig. 6. Comparison between the visual pigments of terrestrial animals and those livingin very shallow fresh water and very shallow coastal water
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