Seasonal distribution and activity patterns of mesopredators and their prey in Southwest China

Mesopredators play an important role in shaping communities, especially when apex predators are no longer present. To persist, mesopredators must confront competition by developing different coexistence strategies. In this study, we used detection and activity data derived from remote cameras to investigate the seasonal coexistence of mesopredators and their interactions with prey in a region of Southwest China where apex predators have been extirpated. We found that Siberian weasels (Mustela sibirica) occupied the entire study area, whereas masked palm civets (Paguma larvata) were restricted to <1,900 m in fall, and expanded their ranges up by about 600 m in spring to likely prey on small mammals. We detected weasels at almost all locations where civets were present, but detection rates and activity patterns for both species suggested avoidance of larger-bodied civets by weasels. We found that weasels were active at all hours and overlapped with all prey both spatially and temporally, whereas civets were nocturnal and crepuscular, which only overlapped with murid rodents. Although we did not directly observe intraguild or predator-prey interactions, evidence suggested that masked palm civets and Siberian weasels seem to coexist due to different seasonal dietary preferences, hunting strategies, and activity patterns.