Light and Sexual Function
It has long been suspected that light conditions play a role in the annual cycle of the sexual function in animals. Rowan (1925–1928), for example, observed North American finches who migrate every fall to their far distant winter quarters in the south. In captured birds, artificial daylight approximating the length of days in summer induced premature activity of the gonads, which had already regressed to their winter minimum. This exposure to light interrupted the natural migratory rhythm. Upon being set free, the finches broke off their migration and returned north even though it was still winter.
KeywordsMigration Estrogen Retina Testosterone Fluores
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