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ABSTRACT.-We recorded 181 avian species at the Paraguayan Cerrado site, Parque Nacional Serrania San Luis, depto. Concepcion, including the first record of Veery (Catharus fuscescens) for the country. We obtained further evidence of hybridization between White-bellied (Basileuterus hypoleucus) and Golden-crowned (B. culicivorus) warblers. Our results combined with those of earlier workers document a total of 219 species for this area. Pronounced differences in species composition exist between San Luis and a nearby Cerrado locality. Three threatened and four near-threatened species were recorded at San Luis. Since our inventory the area that we worked was traded for an adjacent, less human impacted sector of similar size. The new park boundary contains relatively pristine campo (grassland), which is an important habitat for a number of resident and migrant species suspected to be suffering serious population declines. Received 29 Jan. 1998, accepted 14 Nov. 1998.
RESUMEN.-Se registraron 181 especies de aves en el Parque Nacional Serrania San Luis, en el cerrado del Paraguay, depto. Concepcion. La lista incluye el primer registro de Catharus fuscescens para el pals, y mas evidencia de hibridizacion entre los parulidos Basileuterus hypoleucus y B. culiciviorus. En combinacion con los resultados de investigadores anteriores, han sido registrado 219 especies de aves para la zona. Existen diferencias marcadas en la composicion avifaunistica entre San Luis y otra localidad cercana en cerrado. Se registraron tres especies amenazadas y cuatro casi-amenazadas en la zona. Desde que se hizo el presente estudio, se cambio. el area de estudio por otro adyacente, menos impactado y de extenso similar; esta zona abarca mas del campo (pastizal) en buen estado de conservacion, el cual es un refugio para varias especies residentes y migratorias que se cuentran en declives poblacionales.
The Cerrado is the second largest ecological region in South America (Ab' Saber 1977), but has only recently attracted the attention of avian biogeographers (Haffer 1985; Silva 1995a, b, c). Silva (1995a) demonstrated that about 70% of the Cerrado is inadequately sampled and that the southern component especially is poorly known and most heavily impacted by human activities. The Cerrado reaches its southern terminus in northeastern Paraguay, where it interdigitates with two other physiogeographic and biotic regions: the Chaco and the Atlantic Forest (Hayes 1995a). The lack of a quantitative...