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- W2022067670 abstract "This study investigated in male European hamsters (Cricetus cricetus ) whether entrainment of circannual rhythms follows the principles of the nonparametric entrainment model. In 2 experiments the times of the year when long (LP) or short photoperiod (SP) are able to synchronize the reproductive cycle were determined, by recording phase response curves (PRCs). A total of 28 groups of 10 hamsters were synchronized by SP, before being subjected to 2 converse experiments: a) 14 groups were transferred to constant LP, only interrupted by SP for 1 month (SP-pulse), the pulse being increasingly delayed between groups by 2 weeks or 1 month steps; and b) the remaining 14 groups stayed in constant SP interrupted by LP for 1 month (LP-pulse) at different phases of the cycle. In a 3rd experiment 5 groups of 10 European hamsters were subjected to constant LP interrupted by 1-month SP-pulses in regular non-365-day zeitgeber intervals (circannual T-cycles) differing between groups (c). The reproductive state was checked every 2 or 4 weeks. The PRCs revealed that an SP-pulse had a very strong phase-resetting capability of -180 degrees to at least +81 degrees in subjective summer (a). During subjective winter when the animals hibernate, a SP-pulse had only weak effectiveness (a) whereas an LP-pulse advanced the circannual clock by up to +41 degrees (b). In the latter conditions a further advance of up to +156 degrees was achieved by the decrease in photoperiod at the return to SP conditions, which terminated the reproductive phase already after 4 to 5 weeks. In different circannual T-cycles the animals entrained for at least 2 cycles (c). In conclusion, 1) the circannual rhythm of European hamsters can be entrained by one photoperiodic signal per cycle, 2) the decrease in photoperiod is most important for its synchronization, and 3) as in circadian clocks the resetting of circannual clocks follows the principles of the nonparametric entrainment model." @default.
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- W2022067670 date "2009-09-15" @default.
- W2022067670 modified "2023-10-14" @default.
- W2022067670 title "Circannual Phase Response Curves to Short and Long Photoperiod in the European Hamster" @default.
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- W2022067670 doi "https://doi.org/10.1177/0748730409344502" @default.
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