The Seasonally Dry Tropical Forests in Peru are well known for their bird and plant diversity and endemicity, but little is known about the diversity of small mammals. We report the diversity of small volant and non-volant mammals from the Seasonally Dry Tropical Forests of the Huallaga river basin in the San Martín Department, working on both sides of the river, making a sampling effort of 3060 traps-night for non-volant and 104 mist nets-night for volant mammals. We recorded 29 species, including five marsupials, three rodents, and 21 bats. Among the bats, phyllostomids were the most diverse group with 16 species. Short-tailed Spiny-rat, Proechimys brevicauda (Günther, 1877) and Seba’s Short-tailed Bat, Carollia perspicillata (Linnaeus, 1758), featured the highest relative abundance. In addition, we report the first records for the San Martín Department of Peropteryx macrotis (Wagner, 1843), Saccopteryx bilineata (Temminck, 1838), Lonchorhina aurita Tomes, 1863, Vampyriscus bidens (Dobson, 1878), and Myotis simus Thomas, 1901. The species richness and diversity indices indicate the study site has a high diversity value; however, fragmentation and rapid changes in land-use are the main threats faced by the biodiversity of these dry forests.
Bibliographical noteFunding Information:
We thank the Instituto de Investigaciones de la Amazonía Peruana (IIAP), which through Giussepe Gagliardi allowed one of us (DR) to be part of the expedition to the dry forests of San Martín department. We also thank the members of the Asociación de Conservación y Protec-ción Ecológica “El Valle del Biavo”, Asociación de Pro-tección Ambiental del Bosque “El Quinillal”, Asociación de Conservación y Protección Ecológica “El Bosque del Futuro Ojos de Agua”, and Asociación de Conservación y Protección Ecológica “El Incaico” for the use of facilities during fieldwork for this study. We also thank Mari-bel Taco, Mercedes Molina, Judith Carrasco, and Rocío Bardales for helping in the identification of marsupials and rodents, and Miluska Ramos for help us with cata-loging the samples in the MUSM collection. We thank the Ministerio de Agricultura y Riego (MINAGRI) for issuing the research permit outside protected areas with Resolution No. 0068-2015-SERFOR-DGGSPFFS.
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