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Annual gonadal cycles in birds: modeling the effects of photoperiod on seasonal changes in GnRH-1 secretion

Dawson, Alistair. 2015 Annual gonadal cycles in birds: modeling the effects of photoperiod on seasonal changes in GnRH-1 secretion. Frontiers in Neuroendocrinology, 37. 52-64. 10.1016/j.yfrne.2014.08.004

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Abstract/Summary

This paper reviews current knowledge of photoperiod control of GnRH-1 secretion and proposes a model in which two processes act together to regulate GnRH1 secretion. Photo-induction controls GnRH1 secretion and is directly related to prevailing photoperiod. Photo-inhibition, a longer term process, acts through GnRH1 synthesis. It progresses each day during daylight hours, but reverses during darkness. Thus, photo-inhibition gradually increases when photoperiods exceed 12 hours, and reverses under shorter photoperiods. GnRH1 secretion on any particular day is the net result of these two processes acting in tandem. The only difference between species is their sensitivity to photo-inhibition. This can potentially explain differences in timing and duration of breeding seasons between species, why some species become absolutely photorefractory and others relatively photorefractory, why breeding seasons end at the same time at different latitudes within species, and why experimental protocols sometimes produce results that appear counter to what happens naturally.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.yfrne.2014.08.004
CEH Sections: Watt
ISSN: 0091-3022
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link
Additional Keywords: birds, GnRH1, seasonality, photoperiodism, photorefractoriness, starling, quail
NORA Subject Terms: Ecology and Environment
Zoology
Biology and Microbiology
Date made live: 23 Sep 2014 10:08 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/508454

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