Alpine goats appear to be shrinking in size, according to scholars at Durham University, and that is due to global warming over the past 30 years, they say.
Young Chamois now weigh about 25 percent less than animals of the same age in the 1980s, they found, and note that in recent years, decreases in body size have been identified in a variety of animal species and have frequently been linked by other scholars to changing climate.
Yet they believe the decline in size of Chamois is unprecedented in its speed and magnitude, they write in Frontiers in Zoology. There is just one problem with their conclusion; the data they used was records of Chamois body weights provided by hunters in the Italian Alps, which is not a controlled study.
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."
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."
According to the authors, the future plight of the Chamois remains unclear.
Dr Philip Stephens, another co-author on the study, in the School of Biological and Biomedical Sciences, at Durham University, said: "The body mass of juvenile animals is critical to their ability to survive harsh winters.
"However, whether that becomes a problem will depend on the balance of future climate change between the seasons."
The research suggests that declining body size is a result of changes in both climate and the density of animals.
To counter declining body size in future, the researchers say it might be necessary to maintain Chamois populations at lower densities than occur at present, perhaps through changes in hunting regulations.
Dr Mason added: "This study shows the striking, unforeseen impacts that climate change can have on animal populations.
"It is vital that we continue to study how climate change affects species such as Chamois. Changes in body size could act as early-warning systems for worse impacts to come, such as the collapses of populations."