Influência da sazonalidade em aves passeiformes em uma área de caatinga no município de Santa Cruz do Capibaribe, Pernambuco

Abstract

The seasonality of birds in the Caatinga is strongly influenced by the rainfall regime.During the rainy season, from December to June, there is an increase in the availability of resources such as water and food, favoring reproduction and attracting a greater diversity of species. Many birds synchronize their reproductive cycle with this period, taking advantage of the more favorable conditions. Conversely, the dry season drastically reduces resources, causing many species to migrate or adapt their behaviors to survive the arid conditions of the Caatinga.This study aimed to analyze the seasonality of some bird species over a one-year period in a Caatinga area located in Santa Cruz do Capibaribe, Pernambuco, Brazil. Fourteen species were analyzed, of which six showed seasonal patterns: Vireo chivi, Empidonomus varius, Elaenia spectabilis, Myiopagis viridicata, Pachyramphus polychopterus, e Pachyramphus validus. Notably, it was observed that some bird species tend to occur in the region during the rainy season, when food availability is higher. Additionally, there was an increase in the occurrence of certain endemic species during the mentioned rainy period, as there is an overlap of some migratory species with the endemic species. For example, the Phaeomyias murina species increases significantly in the wetter months, possibly due to the arrival of many migrants. This rainy season provides more favorable conditions for reproduction and resource availability, attracting individuals from other areas in search of food and shelter. The research concludes that climate variability is a determining factor in the seasonality of birds in the Caatinga, highlighting the need for habitat conservation