Distribuição geográfica e status de conservação de espécies de Sebastiania spreng. (euphorbiacea) endêmicas do nordeste do Brasil.

Abstract

Sebastiania Spreng. is a Neotropical taxon that is part of Hippomaneae, a tribe that has around 33 genera and approximately 300 species. In Brazil, the center of diversity of the genus, it is represented by nine species (S. brasiliensis, S. brevifolia, S. jacobinensis, S. larensis, S. macrocarpa, S. pteroclada, S. riparia, S. subsessilis and S. trinervia of which seven are endemic. The genus is distributed in theextraAmazonian portion of the country, with most species occurring inseasonally dry forests, especially in the caatinga and semi-deciduous forests of the Southeast, Center-West and South, rarely in the Atlantic Forest and, it is common, to be found inthe banks of rivers and streams.The present study aimed to evaluate the geographic distribution of Sebastiania species endemic to Northeast Brazil. This work recorded 3 species distributed across the region's phytophysiognomies, all of which are endemic to the Brazilian Northeast. The species chosen were Sebastiania brevifolia, S. jacobinensis and S. macrocarpa. A data collection was carried out using speciesLink, with the purpose of generating spread sheets with the occurrence data of the selected species. With this data, a map was generated with all the geographic distributions of the selected species using QGIS model 2.18.28. The Northeast regions that presented the highest degree of richness in the number of specimens were Bahia, Pernambuco and Ceará, followed bySergipe, Rio Grande do Norte and Paraíba. Among the species analyzed, S. macrocarpa was the one with the widest distribution, having records in the states of Bahia, Pernambuco, Ceará, Paraíba and Rio Grande do Norte. Sebastiania jacobinensis was distributed in four states (Bahia, Pernambuco, Ceará and Sergipe) and S. brevifolia was distributed in only three states (Bahia, Pernambuco and Ceará). According to their conservation status according to IUCN (2019), S. brevifolia and jacobinensis are considered of little concern due to their range of occurrence and may be considered endangered. S. macrocarpa is now considered tobe of concern, according to IUCN criteria (2019), also presenting it as endangered