Photoperiodism in hamsters: abrupt versus gradual changes in day length differentially entrain morning and evening circadian oscillators.

@article{Gorman1997PhotoperiodismIH,
  title={Photoperiodism in hamsters: abrupt versus gradual changes in day length differentially entrain morning and evening circadian oscillators.},
  author={Michael R. Gorman and David R. Freeman and Irving Zucker},
  journal={Journal of biological rhythms},
  year={1997},
  volume={12 2},
  pages={122-35}
}
In studies of photoperiodism, animals typically are transferred abruptly from a long (e.g., 16 h light per day [16L]) to a short (8L) photoperiod, and circadian oscillators that regulate pineal melatonin secretion are presumed to reentrain rapidly to the new photocycle. Among rats and Siberian hamsters, however, reentrainment rates vary depending on whether additional darkness is added to morning or evening, and a subset of hamsters (nonresponders) fails ever to reentrain normally to short… CONTINUE READING

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