Background Habitat loss and fragmentation in the Sierra Madre Oriental (SMO) ecological corridor have negative impacts on the movement and distribution of mammalian species that are of great ecological and evolutionary importance. Part of the SMO ecological corridor that is located in the state of Hidalgo is less studied despite being a potential dispersal route for mammals. The objectives of this study were to evaluate the presence and activity of terrestrial mammals in the riparian and non-riparian zones of SMO. Results Camera traps detected 15 mammalian species (i.e., 14 native and 1 domestic) in the non-riparian zone, and 12 mammalian species in the riparian zone (i.e., 10 wild and 2 domestic). The riparian corridor was mainly used by opportunistic medium-sized carnivores, while large carnivores and their potential prey were more frequent in the non-riparian zone. Conclusions Our findings suggest terrestrial mammals avoid the use of natural corridors due to the presence of domestic dogs, cattle and humans and look for new dispersal routes to move through their habitat and find the resources they need to survive. Even though some species can use disturbed corridors to move and find resources, they will change their activity patterns to avoid contact with humans and potential threats like dogs. It is, therefore, crucial to identify not one, but several corridors that must be preserved to improve the connectivity of terrestrial mammals in disturbed landscapes.
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