Variação temporal da assembléia de aves em um estágio de regeneração inicial de uma Floresta Estacional Decidual do Norte de Minas Gerais

Abstract

The Deciduous Seasonal Forests or dry forests are jungle formations that show a high degree of endemism, richness of species and environmental diversity. Currently, only 0.09% of all that dry forest are preserved despite representing 42% of all vegetal formation of the planet. Specifically in Brazil, works aimed at understanding how communities of deciduous seasonal forests are organized over time are scarce. In this paper, the focus is on succession and how this mechanism changes the structure of birds community. However, studies that broach how the succession works on birds community in dry forests are inexistent. Thus, the objectives of this study were to verify if there are some differences in birds community and in feeding guilds during the study period. Our results show that there are temporal variations in birds community as much as in the wealth and in the abundance and species composition. There is an increasing number of species and individuals over time. We found a pattern of growth of these parameters on the 3th year of data collection. A likely explanation for the high diversity in this year is the Intermediate Disturbance Hypothesis (IDH). The increase of wealth and abundance is the result of structurally intermediate habitats and highly heterogeneous. Among the guilds, the largest difference was found for nectarivores and frugivores-insectivores. The availability of resources among the years may be the factor that explains the observed differences as much as in the wealth and in the abundance and composition. Thereby, long-term studies are essential to highlight the factors that affect the structure and dynamics of birds community