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Involvement of circadian rhythm in response to ultrashort photoperiods in blackheaded bunting, Emberiza melanocephala

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Abstract

Groups of photosensitive adult female blackheaded buntings were exposed to various ultrashort days photoperiodic regimes for 60 days in which a fixed 3 h photo-phase was coupled with dark phases in cycles of 22 to 32 hours duration. One group of buntings was kept in long days (15L:9D) as control. Significant increase in ovarian weight and circulating plasma estradiol concentration was marked in the cycles of 30 h (3L:27D), and 32 h (3L:29D) photoperiodic schedules as well as in control group (15L:9D), whereas there was no response in the cycles of 22 h (3L:19D) and 24 h (3L:21D). It seems that the response to ultrashort day cycles is due to a phase advance or delay in photosensitivity of the response system repeatedly shows coincidence of the external photophase (3 h) with the photoinducible phase of an endogenous circadian rhythm. Therefore, the present result appears to be consistent with Bunning hypothesis suggesting the involvement of an endogenous circadian component in the female blackheaded bunting.

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Mishra, M.K., Tewary, P.D. Involvement of circadian rhythm in response to ultrashort photoperiods in blackheaded bunting, Emberiza melanocephala. BIOLOGIA FUTURA 48, 453–461 (1997). https://doi.org/10.1007/BF03542955

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