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International Journal of Ecology
Volume 2010, Article ID 152437, 7 pages
http://dx.doi.org/10.1155/2010/152437
Research Article

Temporal Dynamics and Resource Availability for Drosophilid Fruit Flies (Insecta, Diptera) in a Gallery Forest in the Brazilian Savanna

1Programa de Pós Graduação em Ecologia, Instituto de Biologia, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Asa Norte, 70910-900 Brasília, DF, Brazil
2Departamento de Ecologia, Instituto de Biologia, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Asa Norte, 70910-900 Brasília, DF, Brazil
3Departamento de Genética, Instituto de Ciências Biológicas-GEM, Universidade de Brasília, CP 04457, 70919-970 Brasilia, DF, Brazil

Received 26 February 2010; Accepted 22 July 2010

Academic Editor: Panos V. Petrakis

Copyright © 2010 Henrique Valadão et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Seasonality can cause severe bottlenecks in natural populations, even leading to local extinction. Large variation in resource availability may explain the bottlenecks, but the role of these variations is still poorly understood. The goal of this study was to analyze if temporal variations in the guild of drosophilids breeding in fruits of Mauritia flexuosa (Arecaceae) can be explained by the shortage of this resource during the dry season. Fruits of M. flexuosa were collected over one year in a gallery forest located in the Central Brazilian Savanna. The drosophilid assemblage varied over time, with a lower density of species and of individuals in the dry season, when the percentage of colonized fruits was also smaller. These findings suggest that although the fruits were available during the dry season, they were underused. This way, the resource availability does not seem to regulate the community in the dry season.