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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.)

Influence of phosphorus on copper toxicity to Selenastrum gracile (Reinsch) Korshikov

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Rocha, Giseli S. [1] ; Lombardi, Ana T. [2] ; Melao, Maria da Graca G. [1]
Total Authors: 3
[1] Univ Fed Sao Carlos, Dept Hidrobiol, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Bot, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Web of Science Citations: 6

Microalgae need a variety of nutrients for optimal growth and health. However, this rarely occurs in nature, and if nutrient proportions vary, biochemical changes can occur in phytoplankton community. This may result in modifications of zooplankton food quality, affecting aquatic food chains. Our aim was to investigate the toxicity of copper (Cu) to Selenastrum gracile, a common freshwater Chlorophyceae, at different physiological status induced by varying phosphorus (P) concentration in culture medium. Phosphorus was investigated at 2.3 x 10(-4),1.1 x 10(-4), 2.3 x 10(-5), 4.6 x 10(-6) and 2.3 x 10(-6) mol L-1 and Cu at six concentrations, ranging from 6.9 x 10(-9) mol L-1 to 1.0 x 10(-7) mol L-1 free Cu2+ ions. To guarantee the cells would be in a physiological status that reflected the external P concentration, they were previously acclimated up to constant growth rate at each P concentration. Phosphorus acclimated cells were then exposed to Cu and toxicity was evaluated through population density, growth rates and chlorophyll a content. Free Cu2+ ions concentrations were calculated through the chemical equilibrium model MINEQL(+). The results showed that higher Cu toxicity was obtained in P-limited than in P-replete cells, and that chlorophyll a/cell was higher in P-limited cells and excess Cu than in P-replete cells. This confirms the importance of microalgae nutritional status to withstand the negative effects of the trace metal. (C) 2016 Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 08/02078-9 - Ecophysiological and production studies of the freshwater Anostraca Dendrocephalus brasiliensis Pesta 1921 and its implications on zooplanktonic and nektonic communities
Grantee:Maria da Graça Gama Melão
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 09/15511-5 - Comparative analysis of biochemical composition and nutritional value of Dendrocephalus brasiliensis, Daphnia laevis and Artemia salina fed with algae growth under different environmental conditions.
Grantee:Giseli Swerts Rocha
Support Opportunities: Scholarships in Brazil - Doctorate