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JPR Advance Access originally published online on July 14, 2009
Journal of Plankton Research 2009 31(10):1225-1233; doi:10.1093/plankt/fbp058
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© The Author 2009. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

The influence of cyanobacterium exudates on copper uptake and toxicity to a tropical freshwater cladoceran

Rodrigo Brasil Choueri1,2,*, Paloma Kachel Gusso-Choueri2, Maria da Graça Gama Melão3, Ana Teresa Lombardi3 and Armando Augusto Henriques Vieira3

1 Departamento de Química-Física, Universidad de Cádiz, Facultad de Ciencias del Mar y Ambientales, Polígono río San Pedro s/n, 11510 Puerto Real, Cádiz, Spain 2 Departamento de Ecotoxicologia, Universidade Santa Cecília, Rua Oswaldo Cruz, n°. 266, 11045-907 Santos, SP, Brazil 3 Universidade Federal de São Carlos (UFSCar), Centro de Ciências Biológicas e da Saúde, Programa de Pós-Graduação em Ecologia e Recursos Naturais, Rodovia Washington Luis, km 235, 13565-905 São Carlos, SP, Brazil

* CORRESPONDING AUTHOR: rodrigo.choueri{at}uca.es

Received on April 8, 2009; accepted on June 16, 2009


  Abstract

Many studies have shown the reduction of metal toxicity in the presence of dissolved organic matter in natural waters; however, possible roles of metal-edible dissolved organic matter complexes as a vehicle of metal entrance into trophic chains have been poorly investigated. In this study copper uptake and toxicity to Ceriodaphnia cornuta Sars in the presence and absence of exudates produced by Anabaena spiroides Klebahn were investigated. Groups of 30 adult C. cornuta individuals were exposed to a range of copper concentration (10–8–10–6 mol L–1) during a 24 h period. The "Trimmed Spearmen Karber" method was used to calculate EC50. Copper toxicity was almost 4-fold lower in the presence of 30 mg L–1 of cyanobacterial exudates; without exudates, EC50 was 8.1 x 10–8 mol L–1, while with exudates it was 3.2 x 10–7 mol L–1. Total copper concentration in the animals was determined using differential pulse anodic stripping voltammetry and the results showed that, for both treatments, metal accumulated by the organisms was not significantly different from the negative control, except for immobile individuals. The present results suggest that the animals were able to regulate their body copper content.

Corresponding editor: Roger Harris


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