PMID: 9554576Apr 29, 1998Paper

Decreased light intensity alters the perception of day length by male European starlings (Sturnus vulgaris)

Journal of Biological Rhythms
G E BentleyM Pemberton

Abstract

The breeding season of wild starlings is controlled by photoperiod. Full breeding condition is attained during exposure to lengthening days in the spring, and photorefractoriness ensues. The reproductive system of starlings will not subsequently be stimulated by long day lengths until photorefractoriness is dissipated by the short day lengths experienced in the autumn and winter. Unlike most studies on avian photoperiodism, this investigation involved manipulation of light intensity of a fixed photoperiod rather than of photoperiod itself. Photosensitive starlings transferred from short days to long days of different light intensities underwent graded reproductive responses according to the light intensity they experienced. Testes size in the group in the lowest intensity (3 lux) increased faster than that in controls on short days of normal intensity, but they did not become photorefractory. Testes size increased in the groups on 13, 45, and 108 lux and subsequently became photorefractory. However, the 13- and 45-lux groups required more time to become photorefractory than did the 108-lux group. The responses observed were similar to those seen in starlings exposed to different photoperiods (e.g., 11 h light:13 h dark [11L:13D...Continue Reading

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Citations

Dec 10, 2003·Current Opinion in Neurobiology·Eberhard Gwinner
Apr 30, 2004·British Poultry Science·P D LewisS Leeson
Jan 27, 2007·Proceedings. Biological Sciences·Alistair Dawson
Aug 10, 2007·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Matthew J PaulWilliam J Schwartz
Jul 20, 2007·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Martin WikelskiEberhard Gwinner
May 3, 2013·PeerJ·Nicola SainoLuca Gianfranceschi
Apr 29, 2015·Physiology & Behavior·Suneeta Yadav, Chandra Mohini Chaturvedi
Apr 7, 2009·General and Comparative Endocrinology·Thomas W Small, Ignacio T Moore
May 4, 2015·Hormones and Behavior·Nora H Prior, Kiran K Soma
Jun 10, 2005·Journal of Experimental Zoology. Part A, Comparative Experimental Biology·Sangeeta RaniVinod Kumar
Mar 18, 2015·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Davide M Dominoni, Jesko Partecke
Jun 28, 2016·Journal of Photochemistry and Photobiology. B, Biology·Suneeta Yadav, Chandra Mohini Chaturvedi
Mar 25, 2020·The Journal of Experimental Biology·Irene VerhagenMarcel E Visser

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