Diurnal Dynamics of Vertical Distribution of Diatoms
at Different Levels of Solar Radiation

V. I. Kolmakov*, N. A. Gaevskii*, E. A. Ivanova**, V. M. Gol’d*,
I. Yu. Shatrov*, V. A. Popel’nitskii*, and A. V. Shaposhnikov*

* Krasnoyarsk State University, Svobodnyi pr. 79, Krasnoyarsk, 660062 Russia

** Krasnoyarsk State Agricultural University, pr. Mira 88, Krasnoyarsk, 660049 Russia

Received February 3, 1998

Abstract—Diurnal changes in the vertical distribution of diatoms (their abundance and content of chlorophyll a)
at different levels of insolation were investigated. The cells of seamless colonial pennate diatoms were shown
to be capable of photoinduced diurnal vertical migrations. The existence of an “active” mechanism controlling
vertical migrations in Asterionella formosa Hass is proposed.

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