Abstract
We proposed two perhaps overlapping hypotheses. Hypothesis 1 examined whether daily light information was transduced by a change in the pattern of daily melatonin secretion. Hypothesis 2 tested whether the melatonin amplitude peak was contingent upon seasonal states. To test these hypotheses, we performed three experiments on night migratory blackheaded buntings (Emberiza melanocephala). The first two experiments measured plasma melatonin levels in buntings exposed to light-dark (LD) cycles, with white and/or blue (450 nm) and red (640 nm) light periods differing by about 10-12 fold in the level of illuminance. In birds exposed to a 12 h day (white light) at 0.66 W m(-2) (dim) and 7.85 W m(-2) (bright) light intensities (experiment 1), night melatonin levels were significantly affected by the end of 8-week exposure in the dim, not bright, day with buntings showing a bimodal nocturnal melatonin peak. Similarly, in birds on 13 h days in white, blue and red light periods at 0.028 W m(-2) (dim) and 0.28 (bright) W m(-2) intensities (experiment 2), mid night melatonin levels were significantly higher in red than in the blue or white light periods after 4.5 weeks of exposure. The third experiment measured plasma melatonin levels in b...Continue Reading
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Citations
Jun 14, 2017·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Tyler J Stevenson, Vinod Kumar
Mar 25, 2020·Molecular and Cellular Endocrinology·Aakansha SharmaVinod Kumar