Melastomataceae da Ilha Grande, Angra dos Reis, Rio de Janeiro, Brasil: diversidade, taxonomia e correlações com variáveis edáficas

• Autor(a) principal: Rosa, Lilian Prado Gomes da
• Data de Publicação: 2017
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/7891
• topic: Floristic; Insular flora; Taxonomy; Ecology; Conservation; Florística; Flora insular; Taxonomia; Ecologia; Conservação; CNPQ::CIENCIAS BIOLOGICAS::BOTANICA

Atlantic Forest. In the state of Rio de Janeiro is represented by high richness of species, occurring, preferentially, in the Ombrophilous Dense Forests. Although recognized as important to the state's flora, there are still gaps in the knowledge of this important family, including in island formations. Ilha Grande is considered one of the most important remnants of Mata Atlântica in Rio de Janeiro. Although studies have investigated its flora over the past 15 years, there is still lack of information about this family in this area. Thus, this study was proposed aiming to expand the floristic, taxonomic and ecological knowledge of the family Melastomataceae in the Ilha Grande. Usuals procedures were used for floristic and taxonomic studies, as well as statistical analysis of ordering and regression to evaluate the effect of edaphic variables on the family distribution in the Montana Formation of the Island. A total of 39 species belonging to ten genera were identified: Bertolonia (1 sp), Clidemia (3), Huberia (1), Leandra (5), Meriania (2), Miconia (16), Mouriri (2), Ossaea (3), Pleiochiton (1) e Pleroma (5). Representatives of the family were found in 26 locations. Leandra hirta Raddi and Miconia budlejoiedes Triana constitute new occurrences for the Island, and Miconia gigantea Cogn., a rediscovery for the flora of Rio de Janeiro. The species are distributed in all vegetation formations of the Island, with greater representation in the Ombophile Dense Forests Submontana. Of the 39 species listed, 20 occur in two or more formations and 19 are restricted to only one. The Lowland Ombrophilous Forest and Submontana share the largest number of species. Identification keys and morphological descriptions of genera and species, coments about geographic distribution and occurrence in vegetation formations of the Island, preferential habitats, flowering and fruiting times, besides illustrations and comments on morphological particularities and affinities with nearby species are provided. Five species are endemic to the state of Rio de Janeiro: Bertolonia valenteana Baumgratz, Meriania longipes Triana, Miconia gigantea, Pleroma granulosum (Desr.) D.Don and P. thereminianum (DC.) Triana, which presents conservation problems. The analyzes carried out to evaluate the correlations between species of Melastomataceae and edaphic variables did not indicate any correlation between the chemical and physical variables of the soil and the distribution of species abundances. The results obtained show a great expressiveness of Melastomataceae for the vegetation of Ilha Grande, allowing it to be highlighted in the context of insular flora.