Bird assemblage mist-netted in an Atlantic Forest area: a comparison between vertically-mobile and ground-level nets/Assembleia de aves capturadas em redes de neblina em uma area de Mata Atlantica: uma comparacao entre redes verticalmente moveis e no nivel do solo

Mist nets may be opened at different heights in the forest, but they are seldom used over 3 m above the ground. We used two different methods to compare species richness, composition, and relative abundance and trophic structure of the bird assemblage at Ilha Grande (with a 290 birds standardization): conventional ground-level nets (0-2.4 m height range) and elevated nets (0-17 m) with an adjustable-height system (modified from Humphrey et al., 1968) that we call vertically-mobile nets. There were significant differences in capture frequencies between methods for about 20% of the species (Chi-squared test, P