Abstract
The avifauna of a 70-ha forest fragment located in the North of the state of Rio Grande do Sul, southern Brazil was analyzed. The trophic structure, preferential habitats, relative abundance, and frequency of occurrence of the species were studied, with the aim of analyzing the conservation status of the sampled area. Pre-existing trails in the fragment were used as linear transects and they were monthly coursed between October 2012 and September 2013. Hundred-twenty species of birds were recorded; November and December 2012 had the highest bird abundance and species richness. Forty-two species were registered in 25% of the samples and 39 species in 25.1% - 50% of the samples. The trophic categories with highest diversity were insectivorous, omnivorous and frugivorous. The obtained data indicated that the sampling area plays an important role in the conservation of the local avifauna, housing many species with dependence of environments showing low levels of human disturbance. Keywords: abundance, species richness, birds.
Highlights
The avifauna of a 70-ha forest fragment located in the North of the state of Rio Grande do Sul, southern Brazil was analyzed
Cluster analysis of Jaccard similarity index of avifauna over sampled months in a forest remnant in the North of the State of Rio Grande do Sul, Brazil
Estrutura trófica e ocupação de habitat da avifauna em parque urbano em Porto Alegre, Rio Grande do Sul, Brasil
Summary
O presente trabalho foi realizado em fragmento florestal (27o47’10,92”S e 51o37’15,27”W) situado aproximadamente a 1 km da área urbana do município de São José do Ouro, estado do Rio Grande do Sul. Foi realizado levantamento quali-quantitativo da avifauna, com registro das espécies por meios auditivos e visuais. Para verificar a influência de fatores abióticos (temperatura, umidade e pluviosidade acumulada de 30 dias) sobre a variação da abundância das aves ao longo do período amostral, foram realizados a Análise de Correspondência Canônica e o Teste de Permutação. Foram consideradas insetívoras/carnívoras (INS/CAR) quando a dieta era mista de insetos e vertebrados, com maior proporção de insetos, e carnívoras/ insetívoras (CAR/INS) quando a dieta era mista de insetos e vertebrados, sendo composta principalmente por pequenos vertebrados. Em estudo realizado por Rossi et al (2014), também no Rio Grande do Sul, uma das áreas analisadas de Figura 1. Variantion of bird richness and abundance in a forest remnant in the North of the State of Rio Grande do Sul, Brazil
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