Revista Chilena de Historia Natural 85 (2): 171-178, 2012
RESEARCH ARTICLE
Richness, composition and detectability of Psittacidae (Aves) in three palm
swamps of the Cerrado sensu lato in central Brazil
The objectives of this study were: (1) to investigate the richness and
composition of the Psittacidae in palm swamps; (2) to determine if the sizes of flocks vary seasonally; (3) to compare
detectability rates according to species. Psittacid communities were observed from November 2006 to November 2007 in
semimonthly visits to the area using fixed-point observation. A total of 1616 individuals from eight species were registered
in 199 contacts. The palm swamps were highly similar (H > 0.62), and their diversity was above 1.56. The Yellow-
chevroned Parakeet was considered resident in the three palm swamps (Fr > 60 %). The White-eyed Parakeet and Red-
bellied Macaw were the most abundant species in the three areas. Most of the species (n = 5) were more abundant in one
of the seasons. The most abundant species in the rainy season were the White-eyed Parakeet and Yellow-chevroned
Parakeet (42.16 ± 30.77 individuals), whereas in the dry season the most prevalent was the Red-bellied Macaw (68.50 ±
39.35 individuals). The highest detectability rate was for the Yellow-chevroned Parakeet, which demonstrates the inter-
species differences and the need to adapt the methods of research, unclear for this family.
Key words:
Cerrado
(savanna), detectability rate, palm swamp, Psittacidae
