Resumen

TIERNO DE FIGUEROA, J. Manuel  y  PADIAL, José M.. Wintering avifauna of Chaco and Pantanal habitats in Bahía Negra (northern Paraguay). Hornero [online]. 2005, vol.20, n.2, pp.153-162. ISSN 0073-3407.

The avifauna of habitats typical of two ecoregions in northern Paraguay (Alto Paraguay Department), Chaco and Pantanal, was studied through transects and opportunistic observations. Of 132 species recorded, 109 were in the forest, 75 in the river, and 37 in disturbed habitats. The most common species were Phalacrocorax olivaceus, Pitangus sulphuratus and Gnorimopsar chopi in the river, and Agelaioides badius, Coryphospingus cucullatus and Sicalis luteola in the forest. Twelve species of river habitats and 11 species of forest habitats were recorded in all samplings, five of them common to both zones. Seven species (6.4%) of the forest and six (8%) of the river averaged a flock size of five or more individuals. In the forest, flocks were numerous and composed primarily of Zonotrichia capensis, Sicalis luteola, Coryphospingus cucullatus, Paroaria coronata, Agelaioides badius and Molothrus bonariensis. Species diversity was 80.4 in the forest and 58.1 in the river.

Palabras clave : Abundance; Chaco; Diversity; Pantanal; Paraguay.

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