A primary characteristic of a keystone species is its disproportionately large impact on its ecosystem relative to its abundance. Keystone species play crucial roles in maintaining the structure and balance of ecological communities. For example, certain predators regulate prey populations, while certain plants provide essential resources for other species. The removal of a keystone species can lead to significant shifts in ecosystem dynamics, resulting in biodiversity loss and habitat degradation. Identifying and protecting keystone species is vital for conserving ecosystems, ensuring their function, and maintaining overall ecological health.