MAMMALS FROM A PAMPA AND ATLANTIC FOREST ECOTONE IN SOUTH BRAZIL

Abstract

Ecotones generally present high diversity because they unite fauna that is characteristic of different biomes in a single location. Here, we inventoried medium and large-sized mammals at three sites (from 83 to 342 ha of native vegetation) in an ecotone between Atlantic Forest and Pampa in the central region of Rio Grande do Sul, Brazil, using complementary methods (camera trapping and active search). Between July 2017 and June 2018, we recorded 22 native mammals from seven orders and 15 families, representing 46.8 % of the species expected to occur in the region (N = 47). Eight species are threatened in Rio Grande do Sul, four in Brazil, and one globally. We also detected two exotic species (Sus scrofa and Lepus europaeus) and one domestic (Canis familiaris). The most recorded species were Cerdocyon thous, Mazama gouazoubira, and Dasypus novemcinctus, which accounted for 61 % of all detections. Species richness varied between 6 and 14 species among sampling sites, showing low similarity in species composition between pairs of sites (from 4 to 13 %), with only two species (C. thous, and Procyon cancrivorus) in common. Comparing our assemblages with others throughout the Atlantic Forest and Pampa of Rio Grande do Sul, we observed that small remnants of native vegetation still support the presence of regionally threatened species. Thus, despite anthropogenic pressures present at our study sites, such as poaching and roadkill, small remnants of native vegetation safeguard important mammal species and play an essential role in the long-term survival of the mammalian fauna.