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|Título:||Composition and structure of the Lacustrine Bird Communities of Seasonally Flooded wetlands of western Brazilian Amazonia at High Water|
|Autor(es):||FADINI, RODRIGO F.|
|Resumo:||We describe and analyze the bird community composition of the lacustrine water bodies of the sea-sonally flooded wetlands of the Mamirauá and Amanã Reserves, Amazonas, Brazil. Bird surveys were conducted in54 water bodies within four water body systems aboard a speedboat, in July 2003, at the peak of the high water season.Werecorded 2,823 individuals representing 79 bird species associated with aquatic environments, mostly resident;of these, 34 were aquatic (exclusively associated with aquatic environments), and 19 were primarily piscivorous. Theaquatic bird communities of Mamirauá and Amanã comprise a few abundant species and a higher number of rarespecies. Seven species accounted for 71.7% of all 34 aquatic birds recorded. In general, the more elongated the wa-ter bodies, the lower the aquatic and piscivorous bird species richness, and the lower the bird abundance. Piscivo-rous bird abundance was not significantly related to water body shape. Matrices of bird species by water body weresubjected to multivariate analysis using Principal Co-ordinate Analysis (PCoA). For the quantitative data (speciesabundance) and qualitative data (species presence/absence), the composition of the community of aquatic birdschanged significantly among lacustrine water body systems, and was significantly affected by water body shape. Thequantitative and qualitative composition of the piscivorous bird community did not change significantly among wa-ter body systems, and were not affected by water body shape. The numerical analyses revealed a remarkably differentbehavior of the communities of aquatic birds and piscivorous birds, the former changing significantly with lacustrinewater body morphology and local geography (water body system), and the latter being relatively insensitive to vari-ation in these parameters. Water body shape is one of the determinants of aquatic bird community composition inthe seasonally flooded wetlands of this part of Amazonia. Received 21 June 2006, Accepted 8 December 2006.Key words.—aquatic birds, piscivorous birds, community composition, lacustrine water bodies, water bodyshape, Mamirauá, Amanã, Amazonia, Brazil|
|Aparece nas coleções:||Coordenação de Biodiversidade (CBIO)|
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