Research overview: isotopic niche partitioning among Ice Age predators

This overview examines how stable isotope studies reveal the way coexisting Ice Age predators divided up prey and habitat. By comparing carbon and nitrogen values in the bone collagen of species such as Smilodon, the American lion, and the dire wolf at sites like Rancho La Brea, researchers reconstruct overlapping or distinct dietary niches that indicate competition or resource partitioning. The survey reviews how isotopic niche space is quantified, what patterns of overlap and separation imply about coexistence within crowded predator guilds, and how diet partitioning may have buffered or intensified competition as prey declined toward the end of the Pleistocene. It discusses how this approach complements anatomical and microwear evidence, providing a geochemical window onto the ecological relationships among the great extinct carnivores.