Population size of threatened and endemic birds of the Cerrado in Estacao Ecologica de Itirapina, a fragmented area in the State of Sao Paulo, Brazil

The pressures for land use change have led to an increasing isolation of habitat remnants throughout the world. The goal of this study was to estimate the population size and density of some endemic and threatened species in a nature reserve in the Cerrado biome. One hundred and thirty four point transects were undertaken at the Estacao Ecologica de Itirapina (EEI), one of the last natural grassland savannah remnants in Sao Paulo state, in the south-east of Brazil between September and December 2006 and densities estimated for seven species (four endemic to the Cerrado, one near-endemic and two grassland specialists). Neither species reached the minimum viable population size of 500-5000 individuals. Four species, White-banded Tanager, White-rumped Tanager, Black-throated Saltator and Sharp-tailed Tyrant have populations ranging from 112 to 248 individuals, while the other species have a low population (< 60 individuals). The mean densities of Sharp-tailed Tyrant and Cock-tailed Tyrant in the EEI grassland showed similar values to those observed in larger areas of the Cerrado, which may indicate that the EEL grassland area is well conserved. In spite of the restricted size of the EEI, small areas can maintain some endemic and threatened bird populations, thus contributing to local biodiversity and the ecological processes in the region. The capacity of fragments of Cerrado (similar to 2,000 ha) to maintain populations of endemic and threatened bird species is unlikely to be effective in the long term.

CEMAVE

CEMAVE

Institut Florestal do Estado de Sao Paulo (IF)

Institut Florestal do Estado de Sao Paulo (IF)

Estacao Ecologica de Itirapina for authorisation

Estacao Ecologica de Itirapina for authorisation

CAPES

CAPES

Institut de Biociencias da Universidade de Sao Paulo

Institut de Biociencias da Universidade de Sao Paulo

Idea Wild

Idea Wild

The E. Alexander Bergstrom Memorial Research Award

The E. Alexander Bergstrom Memorial Research Award

Neotropical Grassland Conservancy

Neotropical Grassland Conservancy

W. J. and Virginia W. Moorhouse Memorial

W. J. and Virginia W. Moor-house Memorial

Pamela and Alexander F. Skutch

Pamela and Alexander F. Skutch

Birders Exchange

Birders Exchange