Fiuza, Patrícia OliveiraSilva, Heloysa Farias da2023-09-082023-09-082023-04-12SILVA, Heloysa Farias da. Diversidade e distribuição de hifomicetos associados a diferentes substratos e métodos de amostragem em ecossistemas aquáticos da Mata Atlântica do Rio Grande do Norte, Brasil. Orientador: Patrícia Oliveira Fiuza. 2023. 114f. Dissertação (Mestrado em Sistemática e Evolução) - Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, 2023.https://repositorio.ufrn.br/handle/123456789/54748Aquatic hyphomycetes are asexual ascomycetes and basidiomycetes that complete one or more stages of their life cycle in water, decomposing submerged substrates to increase palatability and nutritional value for other decomposing organisms. In Brazil, the first records were for the Atlantic Forest of São Paulo. In the Northeast there are records in remnants of the biome in Bahia, Pernambuco and Rio Grande do Norte. The present study aimed to carry out an inventory of aquatic hyphomycetes in areas of the Atlantic Forest of Rio Grande do Norte, as well as to analyze the diversity and distribution of communities of these fungi in streams and lakes in Rio Grande do Norte. With this, an inventory of aquatic hyphomycetes, previously isolated from streams: Baldum (Georgino Avelino-RN), Boa Cica (Nísia Floresta), Catu (Canguaretama-RN), Espinho (Canguaretama-RN), Pedra (Baía Formosa-RN) and Guajú (Baía Formosa-RN) was conducted. Submerged substrates (leaves and branches), water parameters were collected in the water bodies of the Pium and Jiqui streams (Parnamirim-RN), and of the Jiqui lakes (Parnamirim-RN) and Ilhota (Nísia Floresta-RN) from June 2021 to April 2022. Wet chamber and submerged incubation methods were used. For the ecological analyses, abiotic variables, abundance, richness (0D), diversity of common (1D), dominant (2D) species and variation in species composition (total beta diversity, turnover and nesting) between ecosystems (lakes and streams) were compared, substrates (leaves and branches) and sampling methods (humid chamber and submerged incubation). The results obtained were presented in two chapters: i) Aquatic hyphomycetes associated with plant debris in freshwater ecosystems of the Atlantic Forest of Rio Grande do Norte, Brazil; and ii) Influence of substrates and sampling methods on the diversity and distribution of aquatic hyphomycetes in lentic and lotic ecosystems. In the first chapter, 77 taxa were presented, distributed in 35 genera associated with plant substrates in water bodies of the Atlantic Forest of Rio Grande do Norte. Among the identified species, Flagellospora minuta is a new record for the Americas; Gyrothrix encephalarti and Triscelophorus konajensis for Brazil; Flagellospora stricta, Polylobatispora deltoidea and Pseudoxylomyces elegans are new occurrences for the Atlantic Forest; and 16 are new records for Rio Grande do Norte. In the second chapter, the results showed that environmental variables, abundances, 0D, 1D and 2D did not differ between lakes and streams. As well as the type of substrate it also did not affect 0D, 1D and 2D. There was a high turnover rate of species between substrates (only for submerged incubation) and between sampling methods, whereas the nesting effect was not observed. There was a high turnover rate of species between substrates (only for submerged incubation) and between sampling methods, with no nesting effect. When the methods were combined, 42 taxa were found, distributed in 34 genera, 23 in leaves, 12 in branches and seven in both substrates. Twenty species were found only in lakes, 19 in streams and four in both environments. Twenty-five taxa were found using wet chamber, 14 with submerged incubation and only three using both methods. The study demonstrated a high richness of aquatic hyphomycetes for the Atlantic Forest of Rio Grande do Norte and can subsidize Funga conservation studies in these areas. The high turnover of species (turnover) between the methods and types of substrate reinforces the importance of the combined use of different sampling strategies and types of habitat for a greater and better representation of the richness, diversity and composition of fungal communities in continental aquatic ecosystems.Acesso AbertoBiodiversidadeDikaryaFungos aquáticosMicrofungosRegião tropicalmasterThesisCNPQ::CIENCIAS BIOLOGICAS