Alpine goats appear to be shrinking in size as they react to changes in climate, according to new research from Durham University. The researchers studied the impacts of changes in temperature on the body size of Alpine Chamois, a species of mountain goat, over the past 30 years. To their surprise, they discovered that young Chamois now weigh about 25 per cent less than animals of the same age in the 1980s.
Alpine goats appear to be shrinking in size as they react to changes in climate, according to new research from Durham University.
The researchers studied the impacts of changes in temperature on the body size of Alpine Chamois, a species of mountain goat, over the past 30 years.
To their surprise, they discovered that young Chamois now weigh about 25 per cent less than animals of the same age in the 1980s.
In recent years, decreases in body size have been identified in a variety of animal species, and have frequently been linked to the changing climate.
However, the researchers say the decline in size of Chamois observed in this study is striking in its speed and magnitude.
The research, funded by the Natural Environment Research Council is published in the journal Frontiers in Zoology.
Lead author Dr Tom Mason, in the School of Biological and Biomedical Sciences, at Durham University, said: “Body size declines attributed to climate change are widespread in the animal kingdom, with many fish, bird and mammal species getting smaller.
“However the decreases we observe here are astonishing. The impacts on Chamois weight could pose real problems for the survival of these populations.”
The team delved into long-term records of Chamois body weights provided by hunters in the Italian Alps. They discovered that the declines were strongly linked to the warming climate in the study region, which became 3-4oC warmer during the 30 years of the study.
To date, most studies have found that animals are getting smaller because the changing climate is reducing the availability or nutritional content of their food.
However, this study found no evidence that the productivity of Alpine meadows grazed by Chamois had been affected by the warming climate. Instead, the team believes that higher temperatures are affecting how chamois behave.
Co-author Dr Stephen Willis, in the School of Biological and Biomedical Sciences, at Durham University, said: “We know that Chamois cope with hot periods by resting more and spending less time searching for food, and this may be restricting their size more than the quality of the vegetation they eat.
“If climate change results in similar behavioural and body mass changes in domestic livestock, this could have impacts on agricultural productivity in coming decades.”
Continue reading at Durham University.
Goat image via Shutterstock.
