Anurofauna do Parque Nacional de Pacaás Novos, Rondônia, Brasil

Abstract

In the world, there are 7,726 species of amphibians described to date and the Anura order has the largest number of identified species, with approximately 6,784 species. The Brazilian anura fauna has 1,039 species, being the most representative. In terms of diversity, Rondonia state has several sub-sampled gaps and it has the highest rates of deforestation in the Amazon. Therefore, the study of the anurans of Pacaas Novos National Park (PNPN), located in Campo Novo of Rondônia, propose to contribute with the biodiversity knowledge of this region. Two areas of the park, upland sites non-subject of flooding and the seasonally flooded areas were sampled in six expeditions carried out during the months of July 2014 to August 2016. Time Limited Visual Search (PVLT) methods, Reproductive Sites (ASR) and Pitfall Traps with Drift Fences (AIQ) were used. The teams used in PVLT and ASR samplings was formed by four or five researchers collecting for two hours/methodology/night, totaling 322 h/man in both ecosystems. Four AIQs (10 pails of 100 Liters) were used with two traps at each area, totaling 340 pails/day/area. During expeditions, 1,571 specimens belonging to 62 species of anurans from thirteen families were recorded: Aromobatidae (5), Bufonidae (4), Centrolenidae (1), Ceratophryidae (1), Craugastoridae (5), Dendrobatidae (2), Hylidae 23), Leptodactylidae (10), Microhylidae (5), Odontophrynidae (1), Phyllomedusidae (3), Pipidae (1) and Ranidae (1). The most frequent family in the park was Hylidae (37.1%). However, Pristimantis fenestratus of the Craugastoridae family was the most abundant species, with 222 specimens recorded (14.13%). The less abundant species (less than 1%) were: Allobates femoralis, Dendropsophus leucophyllatus, D. sarayacuensis, Pristimantis delius, P. diadematus, Teratohyla adenocheira and Trachycephalus cf. cunauaru. The new records for the state were Allobates flaviventris, A. cf. gasconi, Pristimantis delius and P. diadematus. Dendropsophus juliani represented the first record for Brazil. When comparing the richness of two areas, it can be stated that the richness in the seasonally flooded areas is higher in the PNPN, with 18 species that were only found in this area. The richness of PNPN is similar that found in Espigão d'Oeste also located in in Rondonia.