Stable body size of Alpine ungulates

Area of Science:

• Ecology
• Zoology
• Climate Change Biology

Background:

• Increasing global temperatures are linked to decreasing body size in many species.
• Evidence for climate-induced body size changes is often limited by short observation periods and small sample sizes.
• Understanding these shifts is crucial for predicting ecosystem impacts and informing conservation.

Purpose of the Study:

• To investigate long-term body size trends in four abundant Alpine ungulate species.
• To assess the influence of global warming and hunting on ungulate body mass and size.
• To provide data for conservation managers and scientists regarding climate change impacts.

Main Methods:

• Compiled and analyzed extensive datasets (222,961 body weight, 170,729 hind foot length, 145,980 lower jaw length measurements).
• Studied four sympatric Alpine ungulate species: ibex, chamois, red deer, and roe deer.
• Utilized data from the eastern Swiss Alps spanning 1991–2013.

Main Results:

• Body mass and size remained stable across all four species regardless of age, sex, or phylogeny.
• Neither global warming nor local hunting showed a detectable influence on the fitness of the studied wild ungulates.
• Potential counteracting effects of increased nutritional resources and elevational migration were noted.

Conclusions:

• Long-term data indicate stable body size in Alpine ungulates despite environmental changes.
• The study highlights the complexity of predicting climate change impacts on wildlife.
• Further research may explore adaptive strategies like migration and enhanced nutrition in response to warming.