Do degradation processes affect insect distribution patterns in the Caatinga? A study on the far northeast os the brazlan semi-arid region
entomofauna; desertification; conservação; biogeography; Wallacean deficit.
Caatinga is an exclusively Brazilian biome, occupying approximately 10% of the country's area, and occupying territory in the states of Rio Grande do Norte, Alagoas, Bahia, Ceará, Paraíba, Pernambuco, Piauí, Sergipe and Minas Gerais. This biome suffers from a high degree of degradation, with estimates of 40% loss of its native cover, and 20% of the biome heading towards desertification. This process is driven by several natural and anthropogenic factors, and entails environmental and socioeconomic consequences. One of these consequences is the loss of biodiversity, including entomofauna. Insecta is a megadiverse Class that exceeds 1 million described species, constituting approximately 75% of the known species of organisms. However, the decline in the populations of these invertebrates has recently been highlighted by several independent initiatives. Considering the scarce knowledge of the entomofauna of the Caatinga, documenting its distribution in this biome becomes urgent in order to identify which of its elements are at risk. The present study aims to characterize elements of the entomofauna of the Caatinga and its distribution in fragments at different stages of conservation in order to identify possible changes in its composition and dynamics according to habitat changes. Distribution analyses were performed using data from occurrence records publicly available on platforms such as GBIF and SpeciesLink, as well as climate and environmental data collected through the WorldClim platform. After data analysis, we estimate and discuss possible changes in the fauna typically associated with different levels of degradation of the Caatinga; we also identify sampling gaps for entomofauna studies, as well as groups of insects with increased relevance due to the degradation of the biome, thus providing data that should contribute to the elaboration of conservation policies.