Abstract
The spectral sensitivity of the marine green turtle, Chelonia, peaks at 520 nm, with secondary peaks at 600 nm and 460 nm. The peaks remain unchanged under different adaptation conditions. When compared to the fresh-water turtle, Pseudemys, whose peak sensitivity is at 640–650 nm, the entire sensitivity spectrum for Chelonia is seen shifted to the shorter wavelengths. The results are discussed in relation to environmental demand and habitat.

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