Navegando por Autor "Melo, André Laurênio de"

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Distribuição geográfica e status de conservação de espécies de Sebastiania spreng. (Euphorbiacea) endêmicas do Nordeste do Brasil
(2023-09-19) Magalhães, Thais Nunes; Melo, André Laurênio de; http://lattes.cnpq.br/0908553047440221; http://lattes.cnpq.br/6803077394499902
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
Taxonomia de Convolvulaceae a. Juss. na região do Pajeú, semiárido de Pernambuco, Brasil
(2019-12-12) Costa, Rosemeire Santos; Melo, André Laurênio de; http://lattes.cnpq.br/0908553047440221; http://lattes.cnpq.br/4329938055697145
Convolvulaceae includes 58 genera and about 1,880 species with cosmopolitan distribution, but with greater diversity in the tropics. In Brazil it is represented by 24 genera and 430 species. The Northeast of the country has a high number of family species and a great lack of knowledge about Convolvulaceae, although in recent years, several new species have been described, most of them endemic. Local studies have helped to narrow this gap, but little is known about the taxonomic and morphological diversity and geographic distribution of the family in some areas, especially in the semiarid. Thus, this study aims to perform a synopsis of the Convolvulaceae species in the Pajeú region, Pernambuco. The study area is located in the Caatinga phytogeographic domain and comprises 17 municipalities. The study was based on the collection and observation of field populations and analysis of collections belonging to the Semiarid Herbarium of Brazil (HESBRA). So far, 29 species have been recognized distributed in six genera, being Ipomoea the most representative with 19 species, followed by Jacquemontia, with four, Evolvulus with three, Merremia, Operculina and Turbina, with one species each. The recorded taxa can be differentiated mainly through characteristics of the habit, type and shape of leaves and sepals, dimensions and shape and color of the corolla and presence / absence of trichomes or types. All species are new records for area, as there were no family-specific taxonomic studies in the Pajéu region. Most species were found in caatinga vegetation, while I. alba, I. decipiens, I. indica and I. parasitica only in highland forests. Ipomoea alba, I carnea and I. indica are grown in the region as ornamental. Ipomoea bahiensis, I. brasiliana, I. rosea and Turbina cordata occur exclusively in Brazil and I. decipiens, I. marcellia and I. tenera are endemic to the Caatinga domain. Ipomoea decipiens is also here for the first time registered for Pernambuco. Identification keys and comments on geographic distribution, habitats, phenological data and distinctive character of the species are presented here. Endemism data and the new occurrence highlight the importance of preserving the environments found in the Pajeú region, especially the mountain forests, as well as reinforcing the need for further taxonomic studies in the area.