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Influence of quantity and quality of dissolved organic matter (DOM) on bacterial metabolism

Grant number: 17/10299-4
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): August 01, 2017
Effective date (End): January 31, 2018
Field of knowledge:Biological Sciences - Ecology - Ecosystems Ecology
Principal researcher:Hugo Miguel Preto de Morais Sarmento
Grantee:Davi Renato Munhoz
Home Institution: Centro de Ciências Biológicas e da Saúde (CCBS). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Associated research grant:14/14139-3 - Microbial processes and biodiversity in aquatic ecosystems, AP.JP


Heterotrophic bacteria are main decomposers of the organic matter in aquatic environments, through the assimilation of dissolved organic carbon (DOC), converting it into particulate organic carbon. Bacterial production (BP) and bacterial respiration (BR) are essential processes in the carbon cycle in aquatic ecosystems, the first being the process of recovery of energy released in the planktonic trophic chain in the form of DOC by bacteri, And the second, the strategy to obtain energy converting COD into CO2. The dissolved organic matter (DOM) is considered to be the main source of DOC available for aquatic microorganisms. Therefore, studies investigating the influence of DOM on bacterial metabolism in aquatic ecosystems are essential. The objective of this work is to evaluate the effect of different concentrations and complexity (quality) of DOM on the metabolic rates of the same natural bacterial community (BR, BP, BGE and BCD) in a phytoplankton DOM degradation experiment. The analyzes will involve cultures of Cryptomonas obovata and Mircrocystis aeruginosa, isolation of MOD, obtaining a natural bacterial community and experiments on the effect of quality and quantity of DOM on bacterial metabolism. Therefore, this work seeks to add to the panorama of microbial ecology new information on the influence of quantity and quality of DOM on bacterial metabolism. (AU)

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