Specieswatch: tough times for reindeer as rain increases in warming Arctic

When rain falls on snow it creates a layer of ice that impedes feeding, which in turn has reduced herds' birthrates

Reindeer survive typically harsh Arctic winters by using their specially adapted hooves to scrape through the snow to nibble on the lichen and moss below. But paradoxically a warming climate is making it harder for them to reach this food, and research shows it has led to a drop in reindeer birthrates.

When rain falls on snow, the snow melts and refreezes, creating layers of ice that make it more difficult for reindeer to scrape through to the fodder below. Climate records going back to 1960 show that warmer winters have resulted in more rain-on-snow events in Arctic regions. By comparing the weather data with reindeer herd birth statistics from Norway and Finland, researchers have shown that birth rates tend to drop in summers that follow winters with lots of rain-on-snow events.