P. Capllonch et al.: Caracterización de la avifauna de la Selva Atlántica en Misiones

The Atlantic Forest in Argentina is considered to be themost diverse and with the highest degree of bird endemism in the region. During one week in March 2011, in the Parque Provincial Cruce Caballero in San Pedro, Misiones, Argentina,birds were sampled using mist nets and censuses in transects. We recorded 146 species, 32 of them using mist nets. Seven of the captured species represent 50% of total captures: Schiffornis virescens (Pipridae), ileuterus culicivorus (Parulidae), B. leucoblepharus (Parulidae), Tachyphonus coronatus (Thraupidae), Trichothraupis melanops (Thraupidae), Pyriglena leucoptera (Thamnophilidae) and Conopophaga lineata (Formicariidae). More than half of the individuals captured were young birds born during the breeding season. Captured birds were generally small, between 5 grams (Phaetornis eurynome) to 140 grams (Geotrygon montana), and 80 % of species weighing between 8 and 22 grams The presence of Spizasturmelanoleucus, Amazona vinacea, Pteroglossus bailloni, Dryocopus galeatus, Ciccaba huhula, Phylloscartes eximius, Piculus aurulentus, Phylidor atricapillus, Leptasthenura setaria, Hylopezus nattereri, Psilorhamphus guttatus, and Haplospiza unicolor, in the same plots give a high value to this small reserve of 600 hectares due to varying degrees of vulnerability and / or threat to these species and supports the great efforts made by the authorities and ornithologiststo maintain it. It also justifies the annexation of surrounding areas to prevent isolation.