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Toxic effects of emerging microcontaminants on planktonic food webs

Grant number: 16/00753-7
Support type:Regular Research Grants
Duration: November 01, 2016 - October 31, 2018
Field of knowledge:Biological Sciences - Ecology
Principal Investigator:Maria da Graça Gama Melão
Grantee:Maria da Graça Gama Melão
Home Institution: Centro de Ciências Biológicas e da Saúde (CCBS). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Assoc. researchers:Ana Teresa Lombardi ; Hugo Miguel Preto de Morais Sarmento ; Jaqueline Pérola de Souza

Abstract

Nowadays, there is increasing concern with so-called emerging micropollutants, nanomaterials (NMs) or nanoparticles (NPs) (1 to 100 nm), with new properties that give them many technological applications, but its interaction with the aquatic biota is poorly understood. Studies addressing adverse effects of NPs on living organisms are essential to subsidize regulatory agencies in proposition of control legislation. In this sense, since the plankton is sensitive to pollutants and constitutes the base of aquatic food chains, the main objective of this project is to investigate the ecotoxicological effects of exposure of native planktonic species to different NPs (nano-TiO2, Fe2O3, FeCu, CuO , CdSe) and its physiological, biochemical and metabolic implications and assess its assimilation, transfer and bioaccumulation in tropical freshwater microbial chains. Our great challenge is the detection of chronic effects at different levels of biological organization (sub-cellular, individual, population and community), with sub-lethal contamination, especially through food. Besides the ecotoxicological assessments, physiological responses to cellular level of cytotoxicity (size, quantity of pigment, oxidative stress, cell viability) will be evaluated using flow cytometry. In physiological testing with microalgae, we will determine photosynthetic efficiency (Phyto-PAM) considering the photochemical decay, electron transport rate and carbon fixation. To evaluate the metabolism of test-organisms we will use micro respirometers with micro oxygen sensors of high performance (pico-ammeter) in microchambers incubation. In addition, we will investigate the impact of NPs on the biochemical composition (proteins, carbohydrates, total lipids and lipid classes - Iatroscan-TLC / FID) of the studied organisms. (AU)

Scientific publications (4)
(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)
GEBARA, RENAN CASTELHANO; SOUZA, JAQUELINE PEROLA; MANSANO, ADRISLAINE DA SILVA; SARMENTO, HUGO; GAMA MELAO, MARIA DA GRACA. Effects of iron oxide nanoparticles (Fe3O4) on life history and metabolism of the Neotropical cladoceran Ceriodaphnia silvestrii. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, v. 186, DEC 30 2019. Web of Science Citations: 0.
GONSALVES ALHO, LAYS DE OLIVEIRA; GEBARA, RENAN CASTELHANO; PAINA, KARIME DE ARAUJO; SARMENTO, HUGO; GAMA MELDO, MARIA DA GRACA. Responses of Raphidocelis subcapitata exposed to Cd and Pb: Mechanisms of toxicity assessed by multiple endpoints. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, v. 169, p. 950-959, MAR 2019. Web of Science Citations: 1.
PAINA, KARIME DE ARAUJO; GAMA MELAO, MARIA DA GRACA. Zooplankton community structure from tropical temporary ponds during a flood period. LIMNETICA, v. 38, n. 1, p. 189-211, 2019. Web of Science Citations: 1.
DE LUCCA, GISELE MARIA; FREITAS, EMANUELA CRISTINA; GAMA MELAO, MARIA DA GRACA. Effects of TiO2 Nanoparticles on the Neotropical Cladoceran Ceriodaphnia silvestrii by Waterborne and Dietary Routes. WATER AIR AND SOIL POLLUTION, v. 229, n. 9 SEP 2018. Web of Science Citations: 0.

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