Abstract
Cyanobacteria of Barra Bonita Reservoir, which is formed by the junction of Piracicaba and Tietê Rivers comprising an area of circa 384 km2, produce yearly a huge biomass not yet specifically quantified. A great part of this biomass, when dies, suffers decomposition liberating huge amounts of DOM. On the other hand, live cells release, also, high amounts of DOM through active and/or passive processes. All this biomass composed of DOM are then involved in interaction cycles in the surrounding environment, many of these with ending points while inside the reservoir. This work proposes a quantitative and qualitative study of the release and the fate of DOM produced by the most important phytoplankton species pertaining to Cyanobacteria, in terms of biomass production, in the reservoir. In this project we propose to study the effects of cell age, PAR irradiance, and UV radiation in the release of DOM, including cyanotoxins, using species isolated in axenic cultures and of natural populations of Microcystis spp (from surface blooms). It is aimed also to investigate the effects of photodegradation in the bioavailability of DOM and in metal complexes. Regarding the interactions of DOMt/environrnent, we will focus the associations potentially specific between Cyanobacteria and bacteria, related to DOMt and the transfer of carbon from DOM and EPS to bacteria. We Rim to verify the role of EPS of each species in the production of TEP, AGEL and humic substances, as well as to characterize them chemically, identifying the hydrolases involved in their degradation. We intend to couple studies of hydrodynamics to the formation of AGEL and TEP and to the distribution of cells in the photic column. (AU)
Scientific publications
(8)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
BITTAR, THAIS B.;
STUBBINS, ARON;
VIEIRA, ARMANDO A. H.;
MOPPER, KENNETH.
Characterization and photodegradation of dissolved organic matter (DOM) from a tropical lake and its dominant primary producer, the cyanobacteria Microcystis aeruginosa.
MARINE CHEMISTRY,
v. 177,
n. 2, SI,
p. 205-217,
DEC 20 2015.
Web of Science Citations: 8.
TONIETTO, ALESSANDRA EMANUELE;
LOMBARDI, ANA TERESA;
CHOUERI, RODRIGO BRASIL;
VIEIRA, ARMANDO AUGUSTO HENRIQUES.
Chemical behavior of Cu, Zn, Cd, and Pb in a eutrophic reservoir: speciation and complexation capacity.
Environmental Science and Pollution Research,
v. 22,
n. 20,
p. 15920-15930,
OCT 2015.
Web of Science Citations: 5.
TONIETTO, ALESSANDRA EMANUELE;
LOMBARDI, ANA TERESA;
HENRIQUES VIEIRA, ARMANDO AUGUSTO;
PARRISH, CHRISTOPHER C.;
CHOUERI, RODRIGO BRASIL.
Cylindrospermopsis raciborskii (Cyanobacteria) exudates: Chemical characterization and complexation capacity for Cu, Zn, Cd and Pb.
WATER RESEARCH,
v. 49,
p. 381-390,
FEB 1 2014.
Web of Science Citations: 21.
HENRIQUES VIEIRA, ARMANDO AUGUSTO;
COELHO ORTOLANO, PEDRO IVO;
GIROLDO, DANILO;
DELLAMANO OLIVEIRA, MARIA JOSE;
BITTAR, THAIS BERALDO;
LOMBARDI, ANA TERESA;
SARTORI, ANTONIO LUIZ.
Role of hydrophobic extracellular polysaccharide of Aulacoseira granulata (Bacillariophyceae) on aggregate formation in a turbulent and hypereutrophic reservoir.
Limnology and Oceanography,
v. 53,
n. 5,
p. 1887-1899,
Sept. 2008.
Web of Science Citations: 26.