Pigment Dispersion by Light in the Melanophores of the Fiddler Crab
Adaptive color changes in animals have been the subject of a large number of investigations. One genus that has been extensively studied is the fiddler crab, Uca (Fingerman, 1968). The effects of light, temperature, and hormones on the chromatophores of this animal have been successfully described and analyzed. However, incident radiation can elicit chromatophore responses in Uca in two ways (Brown and Sandeen, 1948). One is the direct action of light on the chromatophores (primary response). The other effect (secondary response) is an indirect one caused by light entering the eyes of the animal and ultimately resulting in secretion of neurohormones that affect the crab’s chromatophores. Background responses of Uca are typical secondary responses (Brown and Hines 1952).
KeywordsPrimary Response Secondary Response Fiddler Crab Pigment Dispersion Background Response
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