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Am J Physiol Regul Integr Comp Physiol 251: R1156-R1162, 1986;
0363-6119/86 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 251, Issue 6 1156-R1162, Copyright © 1986 by American Physiological Society

ARTICLES

Photoperiod modifies circadian resetting responses in sparrows

S. Binkley and K. Mosher

Circadian responses to photoperiod were studied in house sparrows (Passer domesticus) by subjecting them to 4-h light pulses and measuring the subsequent phases of their circadian rhythms. The direction and magnitude of phase shifts in response to 4-h light pulses following pretreatment with light-dark cycles (LD) 16:8 or LD 8:16 varied with time of day; advances (3.4 h) occurred when pulses were imposed in the late subjective night on both groups of birds; delays (-2.1 h) occurred when the pulses were imposed in the early subjective night on the LD 8:16 birds. The time profiles for responses to light pulses that scanned 24 h (phase-response curves) were modified by long and short photoperiod. Short photoperiod 1) increased amplitude (1.7 h), 2) increased time from the prior lights-out to the peak of advances (6 h), and 3) decreased the mean phase shift (0.9 h).


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J. A. Evans, J. A. Elliott, and M. R. Gorman
Photoperiod differentially modulates photic and nonphotic phase response curves of hamsters
Am J Physiol Regulatory Integrative Comp Physiol, March 1, 2004; 286(3): R539 - R546.
[Abstract] [Full Text] [PDF]


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