1976
DOI: 10.1016/0016-6480(76)90124-6
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Photoperiodic responses in bilaterally enucleated female white-crowned sparrows, Zonotrichia leucophrys gambelii

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Cited by 40 publications
(18 citation statements)
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“…Dawson, unpublished results). Similarly, ovaries did not fully develop in captive white-crowned sparrows (King, Follett, Farner & Morton, 1966) and this may be due to inhibition by visual stimuli (Yokoyama & Farner, 1976). Peak plasma concentrations of LH and prolactin were only approximately 50 and 30% respectively of those in wild birds.…”
Section: Discussionmentioning
confidence: 97%
“…Dawson, unpublished results). Similarly, ovaries did not fully develop in captive white-crowned sparrows (King, Follett, Farner & Morton, 1966) and this may be due to inhibition by visual stimuli (Yokoyama & Farner, 1976). Peak plasma concentrations of LH and prolactin were only approximately 50 and 30% respectively of those in wild birds.…”
Section: Discussionmentioning
confidence: 97%
“…The existence of extraretinal receptors for the mediation of the photoperiodic response in birds is supported by a number of different experimental findings: 1) the reproductive condition of blind birds can still be altered by changes in the light-dark environment ( Fig. 1; Benoit, 1964;Underwood and Menaker, 1970;Homma et al, 1972;McMillian et al, 1975;Yokoyama and Farner, 1976); 2) an alteration of the amount of light reaching the brain (but not the eyes) by various techniques can alter the photoperiodic gonadal response ( Fig. 1; Menaker et al, 1970;Gwinner et ai., 1971;Turek, 1975) and 3) directing illumination into the brain via light-conducting fibers or radioluminescent implants can induce gonadal development (Homma and Sakakibara, 1971;Oliver and Bayle, 1976; …”
Section: Perception and Transmission Of Photic Informationmentioning
confidence: 91%
“…Extraretinal receptors have been implicated in various stages of the avian reproductive cycle including photic-induced gonadal growth, gonadal regression and the photorefractory condition (Menaker and Keatts, 1968;Turek, 1975;Underwood, 1975). Thus, in birds, the eyes do not appear to play a major role in the perception of light involved in the photoperiodic control of reproduction, although there is some evidence to suggest that retinally perceived light does influence the reproductive system (Homma et al, 1972;Yokoyama and Farner, 1976).…”
Section: Perception and Transmission Of Photic Informationmentioning
confidence: 99%
“…For example, Yokoyama & Farner (1976) found that enucleation leads to an increase in gonadal activity in female white-crowned sparrows. This suggests the intriguing possibility that stimuli most commonly processed by the retinal pathway, i.e.…”
Section: Basics Of the Environmental Regulation Of Annual Cycles In Bmentioning
confidence: 99%