Acute Toxicity of Formalin to the Red-tide Dinoflagellate Prorocentrum minimum Schiller (Protozoa, Mastigophora) |
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Authors: | XU Henglong SONG Weibo ZHU Mingzhuang QIU Yantao MA Honggang |
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Institution: | 1. The Lab of Protozoology, KLMEM, Ocean University of China, Qingdao 266003, P.R. China;Department of Biology, Liaocheng University, Liaocheng 252059, P.R. China 2. The Lab of Protozoology, KLMEM, Ocean University of China, Qingdao 266003, P.R. China |
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Abstract: | The acute toxic levels of formalin to a marine red-tide dinoflagellate Prorocentrum minimum Schiller (Mastigophora, Dinoflagellida) were determined by linear regression analysis. The data obtained revealed that there is a close regression relationship between logarithmic concentrations of formalin and mortality probit scales of the organism when exposure times are 1, 2, 6, 12, 24h. The median lethal concentrations (LC50 values) obtained from correlation analysis for these exposure times (with 95% confidence intervals), were 11.83, 6.76, 4.37, 4.27 and 3.98mgL-1, respectively. A toxicity curve was obtained to connect the exposure time and LC50 value from the correlation between them. The results indicated that P. minimum could be killed or fixed by formalin in the concentration range of 4-12mgL-1 within 1-24h. |
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Keywords: | toxicity formalin dinoflagellate Prorocentrum minimum bioassay |
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