The researchers studied different types of trees and shrubs in the Western Himalayas at different altitudes. They found that as altitude increased, the number of different plant species decreased. This shows that the environment at higher altitudes affects the types of plants that can grow there. In lower areas, most species followed a certain pattern, while in higher areas, they followed a different pattern. This information can help forest managers and policymakers make plans to protect the plants in this area in the future.