LEVANTAMENTO DAS FABACEAE LINDL. NA REGIÃO DA UHE DE BALBINA E FUNCIONALIDADES ECOLÓGICAS

Abstract

In this study, an investigation of the arboreal Fabaceae flora in the influence area of the Balbina hydropower dam in the municipality of Presidente Figueiredo, AM, is presented. The family ranks as the third largest in terms of species among angiosperms, with approximately 770 genera and 19,500 species worldwide. In Brazil, there are around 250 genera and 3,025 species, and in the Amazonas state, approximately 138 genera and 848 species are found. Fabaceae exhibits high richness and diversity and is extensively documented in various floristic studies in the Amazon, with an estimated 11,676 species for the biome, making it the most representative. The species recorded for the Balbina hydropower dam region underwent a comparative analysis of their floristic and phytosociological aspects in the pre and post-flooding periods. The objective was to investigate the composition of richness, diversity, changes, and similarities caused by dam construction. Phytosociological parameters were calculated, including absolute density (AD), relative density (RD), absolute dominance (ADo), relative dominance (RDo), Cover Value Index (CVI), Shannon Diversity Index, Pielou's Evenness, Berger-Parker Dominance, Sorensen Similarity, and Jaccard Similarity. This analysis provided a comprehensive characterization of the flora in the study area and an effective comparison before and after flooding. Additionally, a survey of the phenological aspects of the family in the region was conducted, defining functional patterns related to fruits and identifying dispersal agents.