Tracking the seasons: the internal calendars of vertebrates
TL;DR
Photoperiod (decreasing daylight) triggers hibernation preparation
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This paper explains how animals use photoperiod (daylight duration) as the trigger for hibernation preparation. Understanding that hibernation entry is triggered by environmental signals, not internal decision-making, has implications for when businesses should initiate strategic hibernation - responding to clear market signals rather than waiting for crisis.
Key Findings from Paul et al. (2008)
- Photoperiod (decreasing daylight) triggers hibernation preparation
- Internal biological calendars track seasonal changes
- Hibernation timing is predictable based on environmental cues
- Preparation begins well before scarcity arrives