Variation in hibernation patterns of a temperate zone mammal

Area of Science:

• Ecology
• Zoology
• Climate Change Biology

Background:

• Temperate-zone species use hibernation to survive winter energy deficits.
• Climate change is causing warmer winters and less predictable seasons.
• The flexibility of hibernation strategies in response to environmental change is crucial for species survival.

Purpose of the Study:

• To investigate the hibernation patterns of a wild hedgehog population (Erinaceus europaeus) in response to a mild winter climate.
• To assess the flexibility in hibernation timing and its potential to cope with environmental alterations.
• To understand how individual variation in hibernation strategies might influence adaptation to changing conditions.

Main Methods:

• Field study involving night surveys over a 1-year period.
• Monitoring of 26 wild hedgehogs for population-level activity data.
• Detailed hibernation tracking of five individuals using temperature-sensitive VHF tags.

Main Results:

• All five tagged hedgehogs hibernated, but with significant variation in start (up to 93 days) and end dates (up to 47 days).
• Individual hibernation patterns showed flexibility, with some using shorter torpor bouts and extended activity periods.
• Shorter torpor bouts allowed energy saving on cold nights, while foraging on warmer days when invertebrates were active.

Conclusions:

• Hedgehog hibernation timing demonstrates flexibility, indicating a potential capacity to adapt to changing environmental conditions.
• The observed adaptability in hibernation strategies may be key to the long-term survival of hedgehog populations in a warming climate.
• Individual variation in hibernation patterns highlights the complex responses of wildlife to anthropogenic environmental changes.