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Abstract <p>The paper presents the study (autumn 2021, spring and summer 2022) of small-celled species of centric diatoms (<i>Pantocsekiella teletskoyensis</i>, <i>Stephanodiscus minutulus</i>, <i>S. binatus</i>, and <i>Stephanocostis chantaicus</i>) with a frustule diameter of 3–8 µm abundant in number in the Lake Teletskoye (Altai, Russia) phytoplankton. Valve diameters of <i>P. teletskoyensis</i> dominated in different seasons and parts of the lake were measured using SEM and divided on groups and statistically valid gradation classes. It allows to evaluate the state of <i>P. teletskoyensis</i> population in different parts of the lake—prosperous or depressive. When grouping the obtained valve sizes of <i>P. teletskoyensis</i> with a step of 1 µm (3.00–3.99, 4.00–4.99, and 5.00–7.99 µm), we revealed that in almost all study months and sampling stations frustules of <i>P. teletskoyensis</i> mostly referred to the second size-group and the <i>P. teletskoyensis</i> population characterized as prosperous. At statistical methods application to studying the size structure of populations, distribution by groups was differ. It showed that the state of the study population in phytoplankton in different parts of Lake Teletskoye can be assessed as depressive. In view of this, phytoplankton abundance and biomass (due to small-celled species predominance) in this deep lake are extremely low and correspond to oligotrophic and even ultraoligotrophic levels of water bodies.</p>

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Population of Phytoplankton Dominant in Deep Oligotrophic Lake: Its Size Structure and Role in the Group of Small-Sized Species of Centric Diatoms

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • E. Yu. Mitrofanova,
  • S. I. Genkal,
  • A. V. Dyachenko

摘要

Abstract

The paper presents the study (autumn 2021, spring and summer 2022) of small-celled species of centric diatoms (Pantocsekiella teletskoyensis, Stephanodiscus minutulus, S. binatus, and Stephanocostis chantaicus) with a frustule diameter of 3–8 µm abundant in number in the Lake Teletskoye (Altai, Russia) phytoplankton. Valve diameters of P. teletskoyensis dominated in different seasons and parts of the lake were measured using SEM and divided on groups and statistically valid gradation classes. It allows to evaluate the state of P. teletskoyensis population in different parts of the lake—prosperous or depressive. When grouping the obtained valve sizes of P. teletskoyensis with a step of 1 µm (3.00–3.99, 4.00–4.99, and 5.00–7.99 µm), we revealed that in almost all study months and sampling stations frustules of P. teletskoyensis mostly referred to the second size-group and the P. teletskoyensis population characterized as prosperous. At statistical methods application to studying the size structure of populations, distribution by groups was differ. It showed that the state of the study population in phytoplankton in different parts of Lake Teletskoye can be assessed as depressive. In view of this, phytoplankton abundance and biomass (due to small-celled species predominance) in this deep lake are extremely low and correspond to oligotrophic and even ultraoligotrophic levels of water bodies.