Fatores ambientais influenciando a ocorrência e detecção de aves noturnas na Amazônia central

Abstract

The Central Amazonia hydrography influences the structure of the local vegetation forming two distinct environments called as plateaus and lowlands. Also there are areas of secondary forests due to recent human activities. To understand how the topographic variations, secondary forest and dead standing trees influences the occurrence of species of nocturnal birds we used autonomous recorder for data occupancy and detection of species at a large spatial scale.The study was conducted in the Área de Relevante Interesse Ecológico, ARIE), under the Project Biological Dynamics of Fragmented Forests (Projeto Dinâmica Biológica de Fragmentos Florestais, PDBFF), located 70 km north of the city of Manaus, Amazonas state, Brazil. Occupancy of each species was estimated using maximum likelihood models. The principal conclusions of this study are: (1) local elevation influences the occupancy of three species of owl and one species of nightjar; (2) secondary forest areas negative influences the occupancy of two species and positive influences the occupancy of four species; (3) does not seem obvious that dead trees standing influence probabiliadade occupation of nocturnal birds; (4) there werea strong negative effect of moonlight on the detection of owl Lophostrix cristata and the nightjars Hydropsalis albicollis and Lurocalis semitorquatus. Nevertheless, moonlight seems to have a positive effect on the detection of potoo Nyctibius griseus. The method of autonomous recording was efficient to detect nocturnal birds in in high spatial and temporal scale.