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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Does anatoxin-a influence the physiology of Microcystis aeruginosa and Acutodesmus acuminatus under different light and nitrogen conditions?

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Author(s):
Chia, Mathias Ahii ; Cordeiro-Araujo, Micheline Kezia ; Lorenzi, Adriana Sturion ; Bittencourt-Oliveira, Maria do Carmo
Total Authors: 4
Document type: Journal article
Source: Environmental Science and Pollution Research; v. 23, n. 22, p. 23092-23102, NOV 2016.
Web of Science Citations: 6
Abstract

Due to changing global climatic conditions, a lot of attention has been given to cyanobacteria and their bioactive secondary metabolites. These conditions are expected to increase the frequency of cyanobacterial blooms, and consequently, the concentrations of cyanotoxins in aquatic ecosystems. Unfortunately, there are very few studies that address the effects of cyanotoxins on the physiology of phytoplankton species under different environmental conditions. In the present study, we investigated the effect of the cyanotoxin anatoxin-a (ATX-A) on Microcystis aeruginosa (cyanobacteria) and Acutodesmus acuminatus (chlorophyta) under varying light and nitrogen conditions. Low light (LL) and nitrogen limitation (LN) resulted in significant cell density reduction of the two species, while the effect of ATX-A on M. aeruginosa was not significant. However, under normal (NN) and high nitrogen (HN) concentrations, exposure to ATX-A resulted in significantly (p < 0.05) lower cell density of A. acuminatus. Pigment content of M. aeruginosa significantly (p < 0.05) declined in the presence of ATX-A, regardless of the light condition. Under each light condition, exposure to ATX-A caused a reduction in total microcystin (MC) content of M. aeruginosa. The detected MC levels varied as a function of nitrogen and ATX-A concentrations. The production of reactive oxygen species (H2O2) and antioxidant enzyme activities of both species were significantly altered by ATX-A under different light and nitrogen conditions. Our results revealed that under different light and nitrogen conditions, the response of M. aeruginosa and A. acuminatus to ATX-A was variable, which demonstrated the need for different endpoints of environmental factors during ecotoxicological investigations. (AU)

FAPESP's process: 13/11306-3 - The Effects of anatoxin-a and cylindrospermopsin at different nitrogen concentrations and photon irradiances on the physiology of Microcystis aeruginosa (Cyanobacteria) and Scenedesmus acuminatus (Chlolrophyta)
Grantee:Mathias Ahii Chia
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 14/26898-6 - Unravelling some physiological and molecular processes involved in the allelopathic interactions between toxic and non-toxic phytoplankton
Grantee:Mathias Ahii Chia
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 14/01934-0 - Bioaccumulation and detoxification study of cyanobacteria toxins (microcystins and cilindrospermopsin) in lettuce and arugula
Grantee:Maria Do Carmo Bittencourt de Oliveira
Support Opportunities: Regular Research Grants
FAPESP's process: 13/15296-2 - Comparative metagenomics of cyanobacterial blooms in freshwater reservoirs from Pernambuco State
Grantee:Adriana Sturion Lorenzi
Support Opportunities: Research Grants - Young Investigators Grants