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The academic periodical "Vestnik of MSTU" is available under the license Creative Commons Attribution (Attribution) 3.0 Unported (CC BY 3.0).

Petrov A. N., Nevrova E. L.

Experimental evaluation of toxic resistance of benthic microalgae Thalassiosira excentrica Cleve 1903 (Bacillariophyta) under the copper ions impact

DOI: 10.21443/1560-9278-2023-26-1-78-87

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Abstract. With an increase in anthropogenic pressure on the ecosystem of the coastal zones of the sea, the relevance of assessing the state of plankton and benthos communities also increases. In the course of the study, the dynamics of the number of cells of the clone culture Thalassiosira excentrica Cleve 1903 (Bacillariophyta) has been determined under the influence of CuSO45H2O of various concentrations (321024 gL1) under the conditions of 10-day experiments. In the control and at a low concentration of Cu2+, the proportion of living cells remains almost unchanged. The threshold concentration of copper ions for the survival of T. excentrica is 128 gL1. At higher concentrations of Cu2+ (2561024 gL1), a sharp inhibition and death of the culture has been noted already within 13 days. The increase in the absolute number of cells at low concentrations of copper (3264 gL1) is described by the sigmoid response curve of the test-object. The growth values increase by 48 times on the 1st5th day and decrease by 2530 % by the 10th day. At Cu2+ concentrations of 128256 gL1, there is no positive increase in the number of cells on days 15; on subsequent days, it decreases by 2 times or drops to zero. The intensity of the specific cell growth significantly decreases depending on the increase in the concentration of the toxicant. It has been found that on days 15, the specific increase is positive in the range of copper concentrations of 32128 gL1 and negative at concentrations of 256 gL1 and higher. In the period of 510 days, for all concentrations of the toxicant, the values of the specific increase are negative. The obtained results make it possible to recommend T. excentrica as a promising test object for toxicological experiments.

Printed reference: Petrov A. N., Nevrova E. L. Experimental evaluation of toxic resistance of benthic microalgae Thalassiosira excentrica Cleve 1903 (Bacillariophyta) under the copper ions impact // Vestnik of MSTU. 2023. V. 26, No 1. P. 78-87.

Electronic reference: Petrov A. N., Nevrova E. L. Experimental evaluation of toxic resistance of benthic microalgae Thalassiosira excentrica Cleve 1903 (Bacillariophyta) under the copper ions impact // Vestnik of MSTU. 2023. V. 26, No 1. P. 78-87. URL: http://vestnik.mstu.edu.ru/v26_1_n94/7_Petrov_78-87.pdf.

(In Russian, p.9, fig. 4, tables 1, ref 27, AdobePDF)