Composição das assembleias de drosofilídeos (Insecta, Diptera) em um fragmento preservado de Floresta Atlântica comparado com um ambiente degradado nas suas imediações

Abstract

Invasive species are among the biggest causes of biodiversity loss on the planet. Biological invasions continue to grow throughout the world, including in the Drosophilidae family. The present study aimed to observe the diversity of Drosophilidae assemblages from a protected area, the Dois Irmãos State Park and an outside area near it, the Universidade Federal Rural de Pernambuco (Federal Rural University of Pernambuco) and their sazonal patterns. There were four collecting expeditions in each area, two in the dry season, two in the rainy season, using five banana bait traps to attract the drosophilids. A total of 25,108 drosophilids of 4 genera and 21 taxa were collected. The sites presented a composition of similar richness and abundance, with a great predominance of exotic species, which represented 91.4% of the total, and only one species, Drosophila malerkotliana, was the most abundant and represented 70.4% of the abundance alone. It was noticed that this species also dominated the composition of the protected area, that was not the case in a previous study in the same place, in which native species of the willistoni subgroup dominated the assemblage. It is still too early to say what may have caused the results shown here, and further studies are necessary to observe whether the trend of the dominance of the assemble by exotic species will stay in future samplings.