Evaluation of the sub-lethal toxicity of Cu, Pb, bisphenol A and polychlorinated biphenyl to the marine dinoflagellate Cochlodinium polykrikoides

doi:2012.27.1.63

Algae > Volume 27(1); 2012 > Article

Algae 2012;27(1): 63-70. doi: https://doi.org/10.4490/algae.2012.27.1.063

Vinitha Ebenezer and Jang-Seu Ki

*Corresponding Author

Email: kijs@smu.ac.kr

ABSTRACT

Algae are sensitive to a wide range of pollutants, and are effective bioindicators in ecotoxicity assessments. Here, we evaluated the sub-lethal sensitivity of the marine dinoflagellate Cochlodinium polykrikoides upon exposure to copper (Cu), lead (Pb), bisphenol A (BPA), and Aroclor 1016 (polychlorinated biphenyl, PCB). Toxic effects were assessed by observations of the reduction in cell counts and chlorophyll a levels after exposure to each toxicant. C. polykrikoides displayed dose-dependent, sigmoidal responses when exposed to the tested chemicals. EC50-72 h values for Cu, Pb, BPA, and PCB were 12.74, 46.70, 68.15, and 1.07 mg L-1, respectively. PCB, which is an endocrine-disrupting chemical, was the most sensitive, proving its toxic effect on the dinoflagellate. This study provides baseline data on the toxic effects of commonly used heavy metals and endocrine-disrupting chemicals to a marine dinoflagellate.

Key words: Cochlodinium polykrikoides; ecotoxicity assessment; EC50; endocrine disrupting chemicals; heavy metals; marine dinoflagellate