Avifauna na bacia do gaíba

Revista Brasileira de Ornitologia 14 (2) 101-115 Junho de 2006

Composição da avifauna em oito áreas úmidas da Bacia Hidrográfica do Lago Guaíba, Rio Grande do Sul
Iury Almeida Accordi 1,2 e André Barcellos 1
Programa de Pós-Graduação em Ecologia, Laboratório de Ecologia de Populações e Comunidades, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Prédio 43422, 91540-000, Porto Alegre, RS. E-mail: [e-mail]
1 2

CBRO – Comitê Brasileiro de Registros Ornitológicos (www.ib.usp.br/cbro)

Recebido em 03 de julho de 2005; aceito em 02 de junho de 2006

ABSTRACT. Bird composition and conservation in eight wetlands of the hidrographic basin of Guaíba lake, State of Rio Grande do Sul, Brazil. Wetland- dependent bird populations are suffering quick and severe declines, claiming urgent actions to prevent extinctions and avoid disrupting ecosystem functions. Our aim in this study was to survey birds in wetlands of the hidrographic basin of the lake Guaíba, located in south Brazil, to investigate the present status of occurrence of bird species, and assess similarities in species composition among sampled areas. We sampled six habitats in eight wetlands plus the aerial space above them. Qualitative samples were performed along transects afoot, by car or by boat. Special concern was given to global, national and regional threatened birds. We measured the sample effort through the 20-species lists method. We recorded 283 species, being grasslands, marshes and forests the richer habitats in bird species. We discuss the species composition, the similarities in bird assemblages among the areas, and the occurrence of 37 species of conservation concern. KEY WORDS: aquatic birds, bird community, wetlands, 20-species lists method. RESUMO. Populações de aves dependentes de áreas úmidas vêm sofrendo rápidos e severos declínios, exigindo ações emergenciais para prevenir extinções e evitar o rompimento de funções ecossistêmicas.