Why do alpine tundras have fewer animal species than lower mountain habitats?

Alpine tundras support fewer animal species than lower mountain habitats primarily due to the harsh, environmentally stressful conditions that limit biological productivity. The following factors contribute to this reduced diversity:12

• Short Growing Seasons: The brief period available for plant growth and insect activity restricts the energy available to the ecosystem, leading to lower overall productivity compared to temperate or tropical environments.32
• Extreme Climate: Low temperatures, high winds, and frequent weather extremes create a challenging environment where many animals are not adapted for year-round survival.42
• Migration and Dormancy: Because the environment is so demanding, many species are not permanent residents. Instead, they rely on vertical migration to lower elevations during winter or utilize strategies like hibernation and food caching to survive the cold.43
• Nutrient Limitations: Cold temperatures slow the rate of decomposition and the release of soil nutrients, which further limits the plant biomass available to support diverse animal populations.12

Ultimately, the simplicity of the alpine ecosystem means that animal populations are often highly sensitive to weather fluctuations and food availability, resulting in less stability than more complex, lower-altitude habitats.2