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Photoperiodic Control of the Molt Cycle in the Chaffinch (Fringilla coelebs) by Dolnik, Victor R.; Gavrilov, Valery M. is a Environmental Science article available to read on EtoBox.

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## Abstract The molt cycle in Chaffinches (Fringilla coelebs) has a circannual periodicity under constant photoperiodic conditions (12:12LD, 20:4LD). The molt cycle and/or rate, however, can be modified by artificial alteration of daylength. The time of onset and completion of the post-nuptial molt in Chaffinches under natural conditions is a remote expression of vernal photostimulation. The timing of the molt is initiated at the end of the unifactorial phase of photoperiodic control. The onset of molt is induced after a latent period and its termination after another period, i.e. the molt begins and ends spontaneously. Under natural conditions, daylength immediately before and during the molt does not control either the time of onset or of termination of molt. The additional control system increases the rate of the molt in its early phase under short days, whereas under long days it decreases the rate of molt in its late phase. This system may play an adaptive role in synchronizing the end of the molt among birds that begin molt at different times. The postjuvenal molt begins and finishes spontaneously under control of a program of the individual development of juveniles. Short da

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Author

Dolnik, Victor R.; Gavrilov, Valery M.

Publisher

University of California Press; Oxford University Press; American Ornithologists' Union; Oxford University Press (OUP); JSTOR (ISSN 0004-8038)

Published

1980

Language

EN

Field

Environmental Science (Physical Sciences)