Abstract
Saco da Fazenda estuary, despite the impact caused by the flow of effluent domestic and industrial sewage coming fromItajai-Acu River, is the shelter of a great diversity of birds. The knowledge of the composition of bird life becomes crucial in the characterizationof this environment, since in threatened ecosystems, as estuaries are, we may identify alterations in biodiversity and abundancedue to the influence of areas adjacent to the ecosystem. From July 2006 to April 2007 we did biweekly censuses in the assembly of birdsin Saco da Fazenda. 29 species of aquatic birds, distributed in 25 genres and 13 families, being 11 of constant occurrence (37.9%), sixaccessory (20.6%) and 12 species of casual presence (41.3%). Grouping analysis generated through data evaluating monthly averageabundance showed a “300” distance level, resulting in the formation of four distinct groups. Group I: P. brasilianus and H. himantopus,which presented the highest relative abundance. Group II: C. albus, E. thula and E. caerulea, and also G. chloropus, characterized bythe abrupt reduction of units at spring end and summer beginning. A. Brasiliensis, V. chilensis and L. dominicanus integrate group III,organized due to abundances relatively next to the last two species. Group IV was composed by H. palliatus and R. niger, species witha low contribution for abundance.
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