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International Journal on Algae

ISSN Print: 1521-9429
ISSN Online: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v5.i1.90
pages 82-90

The dimensional-age structure of a laboratory population of Scenedesmus quadricauda (Turp.) Breb. in the presence of imazalyl sulfate

V. Yu. Prokhotskaya
Department of Botany, M. V. Lomonosov Moscow State University, I, Block 12, Lenin Hills, 119899 Moscow, Russia
T. V. Veselova
Department of Botany, M. V. Lomonosov Moscow State University, I, Block 12, Lenin Hills, 119899 Moscow, Russia
V. A. Veselovsky
Department of Botany, M. V. Lomonosov Moscow State University, I, Block 12, Lenin Hills, 119899 Moscow, Russia
A. G. Dmitrieva
Department of Botany, M. V. Lomonosov Moscow State University, I, Block 12, Lenin Hills, 119899 Moscow, Russia
V. I. Artyukhova
Department of Hydrobiology, M. V. Lomonosov Moscow State University, Leninskiye Gory, 119899 Moscow, Russia

ABSTRACT

The laboratory population of the alga Scenedesmus quadricauda (Turp.) Breb. was studied under the influence of the fungicide imazalyl sulfate. The simultaneous presence of two groups of cells ("large", 4.0-4.5 mm in width, mainly in the composition of two-cellular coenobia, and "small", 3.0 mm, in the composition of four-cellular coenobia) proved to be a specific feature of the dimensional-age structure of the control population at different stages of its growth. The toxicant at concentrations of 0.001 and 1.0 mg/L was found to inhibit the division of cells and imparted to them anomalous increase in length and the formation of gigantic cells. At concentration of 0.1 mg/L the division of cells resumed within 1-2 days of intoxication. At high imazalyl concentrations (5, 10, and 20 mg/L) division stimulation preceded the fast death of the culture. The main types of the microalgal population's response to the toxicant are presented. Data on the population structure will be appropriate for use to indicate the toxic action of different substances.