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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.)

Cylindrospermopsis raciborskii exudate-Cu complexes: impact on copper dynamics and bioavailability in an aquatic food chain

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Nogueira, P. F. M. [1] ; Lombardi, A. T. [1] ; Nogueira, M. M. [2]
Total Authors: 3
[1] Univ Fed Sao Carlos, Dept Bot, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Sao Paulo, EESC, Nucleo Estudos Ecossistemas Aquat, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Environmental Science and Pollution Research; v. 19, n. 4, SI, p. 1245-1251, MAY 2012.
Web of Science Citations: 1

The increasing contamination of aquatic environments motivates studies on the interactions among natural dissolved organic matter, metals, and the biota. This investigation focused on the organic exudates of the toxic cyanobacteria Cylindrospermopsis raciborskii as a Cu carrier through a three-level aquatic trophic chain (bacteria, protozoa, and copepod). The effects of bacteria activity and growth on the metal-organic complexes were evaluated through changes in free Cu2+ ions, total dissolved, and total particulate Cu. To be sure that the added copper would be complexed to the exudates, its complexing properties were previously determined. The cyanobacteria exudate-Cu complexes were furnished to bacteria that were further used as a food source to the protozoan Paramercium caudatum. This was then furnished as food to the copepod Mesocyclops sp. The results showed that, in general, the cyanobacterial exudates decreased Cu bioavailability and toxicity to the first trophic level (bacteria), but because the heterotrophic bacteria accumulated Cu, they were responsible for the transference for the otherwise low availability metal form. Both the bacteria and protozoan organisms accumulated Cu, but no metal accumulation was detected in the copepods. (AU)

FAPESP's process: 08/03487-0 - Microalgae culture in photobioreactor as a tool for atmospheric CO2 mitigation
Grantee:Ana Teresa Lombardi
Support type: Program for Research on Bioenergy (BIOEN) - Research Partnership for Technological Innovation (PITE)