PMID: 8965259Jan 1, 1996Paper

The photoperiodic clock is blackheaded buntings (Emberiza melanocephala) is mediated by a self-sustaining circadian system

Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology
V KumarB K Follett

Abstract

Three experimental protocols were employed to clarify whether the circadian system is involved in photoperiodic time-measurement in the blackheaded bunting, Emberiza melanocephala. In a single-pulse paradigm, one 8-h light pulse was delivered at different times to groups of birds across three days of constant darkness (DD). Photoperiodic induction, as measured by a rise in plasma luteinizing hormone (LH), showed clear circadian rhythmicity. The second experiment examined the LH responses in birds exposed to lighting cycles using a Nanda-Hamner type of protocol and confirmed full photostimulation under 6L:30D. The third experiment measured the time of the first photoinduced rise in LH in birds subjected to 30 h of continuous light following entrainment under short days (6L:18D). This experiment aimed to identify the position of the photoinducible phase (phi i). LH first rose at hour 18 following dawn indicating that phi i lies in the middle of the day. Plasma concentrations of melatonin were also measured under 6L:18D and 6L:30D light cycles as another physiological marker of the circadian systems in buntings. The pattern of melatonin secretion with the driving oscillator being circadian in nature. It is concluded that the circa...Continue Reading

Citations

Oct 26, 2013·Frontiers in Neuroendocrinology·Vincent M Cassone
May 20, 2014·General and Comparative Endocrinology·Gaurav MajumdarVinod Kumar
May 25, 2013·PloS One·Daniel J Hruschka, Joseph Henrich
Oct 13, 2018·European Journal of Ageing·Lois M Verbrugge, Shannon Ang
Aug 29, 2019·Biology Letters·Jeffrey L RittenhouseHeather E Watts

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