Predator interactions, mesopredator release and biodiversity conservation

Ritchie and Johnson reviewed the mechanisms by which top predators suppress mesopredators and the conditions under which that suppression breaks down. They emphasized that apex carnivores limit smaller predators through both direct killing (intraguild predation) and fear-mediated changes in mesopredator behavior and habitat use, generating cascading benefits for the prey of mesopredators. The review distilled when mesopredator release is likely, how landscape context and prey availability modulate it, and how restoring or mimicking top-down control can conserve biodiversity. It is widely cited in felid contexts, both for how large cats restrain smaller carnivores and for how the loss of large cats can release damaging mesopredators, making it a key conceptual reference.