Wilderness areas maintain mammal assemblage in subtropical mountain forests

Abstract

Most forests are impacted by humans and are at the center of numerous species extinctions. Wilderness areas (i.e., areas with little or no human influence) are essential to limit biodiversity loss and are expected to have the most intact natural communities. The southern Yungas are neotropical mountain forests affected by unsustainable human activities that may pose a risk for many species. We used camera trap data, multispecies occupancy models, and regional human footprint index to assess the occupancy of medium- and largesized mammal assemblage in wilderness areas and the effect of human influence variables in the southern Yungas forests of Salta and Jujuy provinces, Argentina. The occupancy probability of the mammal assemblage, red-brocket deer (Mazama rufa), tapeti (Sylvilagus paraguensis), crab-eating fox (Cerdocyon thous), white-lipped peccary (Tayassu pecari), lowland tapir (Tapirus terrestris), and tayra (Eira barbara) was higher in wilderness areas than in areas with human influence. When one human influence variable of the human footprint index was analyzed at a time, greater distance from hamlets (i.e., small, isolated human houses) resulted in higher occupancy probability of the mammal assemblage, jaguar (Panthera onca), crab-eating fox, and lowland tapir. Distance to transformed areas had no significant effect on occupancy probability of the mammal assemblage, a positive effect on lowland tapir, and a negative effect on grey-brocket deer (Subulo gouazoubira). Distance to roads did not affect the occupancy probability of the mammal assemblage or species. Wilderness areas in the southern Yungas contribute substantially to the conservation of medium- and large-sized mammal assemblage and should be prioritized in conservation strategies.