Formal properties of the circadian rhythm of locomotor activity in Japanese quail |
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Authors: | S M Simpson B K Follett |
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Institution: | (1) ARC Research Group on Photoperiodism and Reproduction, Department of Zoology, The University, Woodland Road, BS8 1UG Bristol, England |
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Abstract: | Summary Japanese quail have a circadian rhythm of locomotor activity whose free-run period ( ) in constant darkness (DD) was 22.5±0.1 h (45). A phase response curve of typical form was obtained by illuminating the free-running rhythm with single 1 h light pulses. Using entrainment theory a derived phase response curve was calculated from the phase relationships between the locomotor rhythm and 1 h light periods in light-dark cycles of various lengths (T). Although the limits of entrainment to theseT cycles differed slightly from those predicted, there was a close correlation between the two phase response curves. The phase relationships between the locomotor rhythm and 1–9 h photoperiods in 24 h cycles were in general accord with a prediction based on the short free-run period and the relative sizes of the delay and advance portions of the phase response curve for 1 h light pulses. |
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