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Temperature rise effect upon organic matter exudated by freshwater microalgae in axenic cultures

Grant number: 22/16279-3
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Start date: February 01, 2023
End date: January 31, 2024
Field of knowledge:Biological Sciences - Ecology
Principal Investigator:Hugo Miguel Preto de Morais Sarmento
Grantee:Israel Cassiano de Oliveira
Host Institution: Centro de Ciências Biológicas e da Saúde (CCBS). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil

Abstract

Dissolved organic matter is one of the main carbon forms in aquatic environments, comprising a wide range of molecules from biological origin, with great relevance in aquatic ecology and climate regulation. Phytoplankton is a major DOM source, yet little is known about its composition and production shifts due to climate warming. Small changes in phytoplankton-derived DOM (DOMp), triggered by changes in environmental factors, may lead to shifts in the microbiome structure and metabolic rates, thus in water carbon fluxes - that is, in the carbon cycle. In order to access the consequences from increasing temperature on DOMp, Microcystis aeruginosa and Cyclotella sp. axenic cultures at distinct growth stages will be subject to warming experiments (4ºC increase with and without previous acclimation) and analyzed by flow cytometry and fluorescence spectroscopy techniques. It is expected that these findings will elucidate some of the processes underlying DOMp production; improve the interpretation of DOM optical properties obtained from natural environment samples; and provide a better understanding on the warming impacts upon key components of the carbon cycle.

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