Why is snow goose a keystone species?

The snow goose is considered a keystone species because its foraging behavior significantly impacts the ecosystems it inhabits. By grazing on vegetation in Arctic and sub-Arctic regions, snow geese help control plant growth and promote habitat diversity, which benefits other species. Their migration patterns also influence nutrient cycling and provide food sources for predators and scavengers. Ultimately, the presence and activities of snow geese play a crucial role in maintaining the balance and health of their ecosystems.