https://repositorio.ufra.edu.br/jspui/handle/123456789/19 Programa de Pós-Graduação em Ciências Biológicas/Botânica Tropical 2026-04-23T18:35:28Z https://repositorio.ufra.edu.br/jspui/handle/riufra/2866 Título: Revisão taxonômica Integrativa das Espécies Neotropicais de Radulaceae (MARCHANTIOPHYTA) Autor(es): OLIVEIRA-DA-SILVA, Fúvio Rubens Abstract: Integrative taxonomic revision of neotropical species of Radulaceae (Marchantiophyta) Radulaceae Müll. Frib. (Porellales Schljakov; Radulinae R.M.Schust.) is a diverse group with more than 300 species distributed worldwide and one of the most isolated lineages of the leafy liverworts (Marchantiophyta Stotl. & Crand.-Stotl.; Jungermanniidae Engl.). Distinctive morphological diagnostics of the family include rhizoids in tufts on the lobule surface, Radulatype branches, large, brown oilbodies, absence of underleaves, and perianth tubular, dorsiventrally flattened. The center of diversity of the species is in the humid tropical regions, although they are distributed on all continents except Antarctica. Most species grow as epiphytes in preserved tropical forests, from the lowlands to montane forests above 4000 m altitude. The family has three genera (Cladoradula, Dactyloradula and Radula), but most species belong to the genus Radula Dumort., which is subdivided into five subgenera: Amentuloradula Devos et al., Metaradula R.M.Schust., Odontoradula K.Yamada, Radula e Volutoradula Devos et al. Circunscriptions of these subgenera are problematic and the subgeneric divisions, supported only by molecular data, are unclear, especially among neotropical species. The species of Radulaceae that occur in temperate forests and in the paleotropical regions of the world have had their taxonomy reviewed, leaving a gap in taxonomic knowledge for the species of the neotropical region, with more than 140 names described and around 75 species currently accepted. A preliminary revision of the species of Radulaceae in Brazil showed that the number of these currently accepted species is probably excessive and that several of them may be synonyms, although new species may yet be discovered. The aim of this study is to carry out an integrative taxonomic revision of the neotropical species of Radulaceae, based on a comprehensive study of types, additional herbarium collections and field collections, using morphological, anatomical, ecological and palynological evidence. Early on in this study, it was possible to identify new taxa with striking features such as bordered leaves (Chapter I). In addition to the review of species from tropical America, a revision was made of Radulaceae species from tropical Africa, especially Madagascar, which resulted in the discovery of two new synonyms of neotropical species in one African (Chapter II). As part of the taxonomic revision, special attention was paid to littlestudied characteristics that can be taxonomically informative, such as spores. In Chapter III, was carried out the first palynological assessment of sixteen species of Radulaceae. Palynological data, especially spore ornamentation, can be an important contribution to the taxonomy of Radulaceae in separating species or groups of species. From the totality of the data and the greater understanding in the circumscription of the species, the taxonomy of Radulaceae was revised, in which detailed descriptions of the species, illustrations of selected taxa, identification keys for all species and comments on their relationships, geographical distribution (with maps) and habitat are presented (Chapter IV). The revision recognized 54 species and six varieties, starting from 75 species initially accepted for the Neotropics. Three new species were discovered and are described in this last chapter, as well as three taxa were reinstated as synonyms of other species; a new combination was proposed, as well as 27 new synonyms, 42 new lectotypes, and six species were placed as doubtful or excluded. The taxonomic revision of Radulaceae in tropical America has led to a better understanding of the circumscription and distribution of the taxa, creating a secure base that will help in future studies. 2024-03-21T00:00:00Z https://repositorio.ufra.edu.br/jspui/handle/riufra/2865 Título: Fogo e a organização funcional da comunidade de árvores: implicações para a resiliência da floresta na Resex Tapajós-Arapiuns Autor(es): SILVA, Danilo Souza da Abstract: Tropical forests play a fundamental role in global sustainability. In this context, fire emerges as a threat because it affects not only the species vulnerable to fire, but also the taxonomic and functional compositions of communities, limiting the maintenance of biodiversity and provision of essential ecosystem services. This study aimed to understand how tree vegetation responds to fire, through functional attributes, and what are the implications for Amazonian forest resilience. The study compared the tree component of unburned forest areas and forests that burned in 2015 and in 2017, in the Tapajós-Arapiuns Extractive Reserve, located in western Pará State, Brazil. The most abundant species (above 50% of total abundance), which constitute the canopy and understory of the tree component, had 12 functional attributes evaluated (e.g., bark thickness, regrowth capacity, wood density). The results showed that species richness differs between the two forest types and suggest that the understory of burned forests responds to fire events through a change in species composition, which highlights species simplification for this stratum. We also observed that functional changes in burned forest arise mainly from attributes of indirect effect to fire, such as dispersal and pollination syndromes, and that there are changes in the functional composition of communities when analyzed at the individual level for both the canopy and the understory. Our study indicates that fire events have caused a negative effect on the tree component of Amazonian humid tropical forests, and that their action has caused functional changes in species in burned forest areas. Furthermore, the effects of fire can vary according to forest stratum. The changes observed as effects of fire may have important consequences for forest dynamics and intensifying studies in this area is essential in the Amazon. 2026-04-16T00:00:00Z https://repositorio.ufra.edu.br/jspui/handle/riufra/2864 Título: Sistemática de Hydrochorea Barneby & J.W.Grimes ( Leguminose, Mimosoideae) Autor(es): SOARES, Marcos Vinicius Batista Abstract: Hydrochorea is a Neotropical genus distributed in northern South America, occurring only in the Amazon and Cerrado domains. Belong the tribe Ingeae, its species have suffered several generic replacements throughout its history. Hydrochorea belongs to the "Alliance-Abarema" informal clade that also has the Abarema and Balizia genus, mainly differentiated by the type of fruit. The genus Hydrochorea is characterized by drupaceous loment fruit characteristic within the tribe, and rare in Mimosoideae. There are still many problems regarding the constituency of taxa currently subordinate to Hydrochorea. In this context, this paper aims to conduct the taxonomic study and the first attempt of the phylogenetic of Hydrochorea in order to show their infrageneric limits and the circumscription of their species as well as the relationships within the "Alliance-Abarema". In this work the "Alliance-Abarema" is strongly supported for two markers with Hydrochorea and Balizia in a polytomy, which together form the sister group of Abarema. Although Hydrochorea group is not resolved as monophyletic, length and support of the branches of this group is not high and the paraphyly of Hydrochorea regarding Balizia is not conclusive. New markers and population approaches should be tested to improve the resolution of this clade and clarify the relationship between these two genus. Hydrochorea is here circumscribed with five species and three varieties. Describes two new species and two lectotipifications are presented. Number of leaf jugae, prominent secondary veins, type and shape of the rachis extrafloral nectaries, flower bud, the shape of calyx in central flower and the presence or absence of this trichomes, were the character used in the separation of species. Taха grow predominantly in margin of rivers, floodplain forests and flooded forest, and areas where the seed can reach by dispersing the rivers. Further studies should be directed to countries like Venezuela, Bolivia, Guyana and Suriname and Brazil, in order to understand the ecology of these species in their natural habitat. 2026-04-13T00:00:00Z https://repositorio.ufra.edu.br/jspui/handle/riufra/2853 Título: Revisão taxonômica das espécies de Tabernaemontana L. (Apocynaceae) da Amazônia brasileira, Brasil. Autor(es): FERNANDES, Géssica Elaine Azevedo Abstract: The Apocynaceae family stands out as one of the most representative within the angiosperm group, comprising approximately 378 genera and 5,350 species. In the Brazilian context, this family is distributed across 96 genera and 977 species, encompassing all biomes present in the country. Among the five subfamilies that constitute the Apocynaceae family, only three are present in Brazil, namely Rauvolfioideae, Apocynoideae, and Asclepiadoideae. The subfamily Rauvolfioideae consists of 12 tribes, with the Tabernaemontaneae tribe standing out as one of the most diversified. Within this tribe, the genus Tabernaemontana, inserted into the Tabernaemontanenae subtribe, emerges as one of the most diversified, comprising over 120 species. Among these, 46 occur in the neotropics, with 30 recorded in Brazil, and of these, 25 in the Brazilian Amazon region. The taxonomy of the Tabernaemontana genus reveals a complex and extensive history marked by significant changes in its circumscription and species recognition, especially in the Amazonian regions where nomenclature and taxonomy were less explored. Recent phylogenetic studies have recognized the genus as monophyletic, including the neotropical genus Stemmadenia. However, the infrageneric circumscription remained ambiguous, demonstrating monophyly only in the Peschiera and Rejoua sections, while other sections exhibited paraphyly. Despite the abundance of Amazonian species, some were not included in the previous phylogeny. The last taxonomic revision of the genus, conducted in the 1990s, proposed seven sections based exclusively on morphological characters. Among these, only two (Bonafousia and Peschiera) have representatives in Brazil, which were the focus of the present study. The objective of this study was to conduct a systematic approach to Tabernaemontana in the Brazilian context, with an emphasis on species occurring in the Amazon, as well as a nomenclatural revision of the discussed species. To achieve this, a comprehensive taxonomic treatment was developed, including detailed descriptions, identification keys, maps of geographic distribution and diversity, as well as considerations on phenology and conservation status. Samples of the genus were analyzed in the IAN, INPA, MG, UFACPZ, RON herbaria in person, while others were requested on loan or analyzed online through digitized images available in foreign and national herbaria databases. Over 4,000 specimens were analyzed in person, resulting in the development of three thesis chapters, encompassing the treatment of 207 names, of which 25 were accepted, 18 lectotypifications, two neotypifications, one epitypification, the proposition of a new name, the reinstatement of a species, and the description of a new species for science. 2025-08-31T00:00:00Z