Influência da decomposição de Eichhornia azurea (Sw.) Kunth na dinâmica bacteriana e de outras variáveis limnológicas : uma abordagem experimental.

• Ano de defesa: 2011
• Autor(a) principal: Dahroug, Zaryf Khaled Araji
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual de Maringá; Brasil; Programa de Pós-Graduação em Ecologia de Ambientes Aquáticos Continentais; UEM; Maringá; Departamento de Biologia
• Palavras-chave em Português: Bactérias; Comunidades, Ecologia de; Densidade; Macrófitas; Decomposição; Taxa de decomposição; Densidade bacteriana; Carbono orgânico dissolvido; COD; Brasil.; Decomposition rate; Dryweight; Aquatic macrophyte; Bacteria; Brazil.; Ciências Biológicas; Ecologia
• Link de acesso: http://repositorio.uem.br:8080/jspui/handle/1/4832

Organic decomposition is a complex interaction between chemical, physical and biological, where the variety of aquatic vascular plants is essential for trophic dynamics of freshwater ecosystems. The goal of this study is determine the aquatic macrophyte Eichhornia azurea (Sw.) Kunth decomposition rate and check the time relation with the limnological parameters and whether this relationship is a decomposition process result. To that end, we collected water and leaves of E. azurea in Surf Leopoldo, PR, for the experiment that is consisted of two treatments: with and without macrophyte addition, 25 containers with 450ml of water and 0.8 grams of dry weight of biomass were used. Samples were taken in triplicate in times 0 (the experiment), 3h, 6h, 12h, 24h, 72h, 120h, 168h and 240h. When the container was removed, the plant material in it were taken into the stoven. After 48 hours it was measured to obtain the final dry weight. Analysis were performed as pH, conductivity, dissolved oxygen (DO), total phosphorus (TP) N-ammonia (NH4) and soluble reactive phosphorus (PO4), and decomposition rate calculation. The results showed significant temporal variation of limnological parameters in all studies. Also, DO, conductivity, COD and TP were correlated with dry weight of biomass, allowing to infer that the E. azurea decomposition interferes significantly in the dynamics of these variables.