UV radiation and harsh cold weather. Those are the two abiotic factors affecting my biome. The cold weather allows only warm blooded animals with layers of fat, cycles of hibernation or migration, and shorter limbs to reduce heat loss. Another factor that goes along with cold air is the thinning as you go higher, because of this animals have larger lung capacity, more blood cells, and hemoglobin because of lower pressure and lack of oxygen. UV radiation is a big problem because of the thinner of the atmosphere that can't block out as much radiation.
Biotic
The biotic factors are all the organisms affect each other. Growth or decline of populations can affect another because of food source and habitats. Human impact also has its affects from endangering animals to habitat loss. Vegetation can affect how well the ecosystem can be due to them being the base. It can also affect erosion because of steepness sin slopes.
Limiting
UV radiation, cold weather, and other species are all limiting factors.