This is interesting because I thought that bear hibernation was a circadian (daylength) event rather than an environmentally-dependent event, but this shows that the trigger for hibernation is more complex that I supposed.
Bears have stopped hibernating in the mountains of northern Spain, scientists revealed yesterday, in what may be one of the strongest signals yet of how much climate change is affecting the natural world.
In a December in which bumblebees, butterflies and even swallows have been on the wing in Britain, European brown bears have been lumbering through the forests of Spain’s Cantabrian mountains, when normally they would already be in their long, annual sleep.
Bears are supposed to slumber throughout the winter, slowing their body rhythms to a minimum and drawing on stored resources, because frozen weather makes food too scarce to find. The barely breathing creatures can lose up to 40 per cent of their body weight before warmer springtime weather rouses them back to life.
“I think it’s an indication of what’s to come. It shows climate change is not a natural phenomenon but something that is affecting not only on the weather, but impacting on the natural world in ways we’re only now beginning to understand.”