2024-09-232024-09-232020-02-07GOMES, Paulo Weslem Portal. Ecologia de comunidades de briófitas em Savana Parque na Ilha de Marajó, Pará, Brasil. Orientadora: Ana Cláudia Caldeira Tavares. 2020. 97 f. Dissertação (Mestrado em Ciências Ambientais) - Centro de Ciências Naturais e Tecnologia, Universidade do Estado do Pará, Belém, 2020.https://portaldaposgraduacao.uepa.br/handle/riuepa/195AbertoMusgosHepáticasExpressão sexualSalvaterraCachoeira do ArariBriófitas - análise - Ilha do Marajó (PA)SazonalidadeMossesLiverwortsSexual expressionDissertaçãoCiências Agrárias::Recursos Florestais e Engenharia FlorestalAmazonian savannas have a predominance of grasses and variable density of trees and shrubs, high light intake and low humidity. In these places, bryophytes can provide important information on environmental quality, as they are sensitive to environmental fluctuations due to the absence of vascularization, epidermal cuticle and their poikilohydric nature. Thus, the objective of this study was to analyze the influence of seasonality and different environments on the structure of communities and on the reproductive structures of bryophytes in Park Savanna (PS) on Marajó Island. 60 plots of 100m2 were also distributed in the dry/2016 and rainy/2017 season in five areas of PS. For community structure, the composition, density, richness and diversity of species between areas and seasons were tested, in addition to substrate colonization and light tolerance guilds. For reproductive strategies, we analyzed the influence of seasonality on the composition of species with monoicous and/or dioicous sexual system and on sexual and asexual reproductive structures in three areas of PS. The area was the main factor that influenced the composition, density, richness and diversity of bryophytes. The predominance of generalists and corticolous indicated that most species are tolerant of the adverse conditions of savannas and that the tree-shrub extract is strictly related to the permanence of bryophytes in savannas, respectively. The area and seasonality did not influence the composition of monoicous and dioicous species, however, the area significantly influenced the expression of sexual and asexual structures and the production of male and female gametangia (liverwort). As for sporophytes (mosses), seasonality was the determining factor in mature phenophase II (opening of sporophytes and dispersal of spores in the dry season). Therefore, it is believed that the micro-habitat of the different areas is the main factor that influences the structure of communities and the reproductive strategies of bryophytes, with the exception of sporophytesphenophase, influenced by seasonality.PPGCA - Estudos de ecossistemas amazônicos