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<b>Abstract</b>— <p>The data on alkaline phosphatase activity (APA) in Lake Baikal bays (Mukhor and Chivyrkuy) are presented. In June 2023 and 2024, APA varied from 667 to 3206 nmol/(L day), i.e., it was an order of magnitude higher than the values for the lake pelagic stations. To assess the contribution of bacterioplankton to APA, the following size fractions were studied: phytoplankton (&gt;5 μm), picoplankton (1.2–5 μm), and bacterioplankton (0.2–1.2 μm). The share of bacterioplankton in the total APA was shown to be 45–56%, except for the Mukhor Bay in 2023, when its contribution was minimal (22%). In general, the share of bacterioplankton in APA was considerably higher then the values reported worldwide, which may be related to the uniqueness of the Lake Baikal ecosystem.</p>

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High Alkaline Phosphatase Activity in Lake Baikal Bays and Contribution of the Bacterial Community to Its Production

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • M. Yu. Suslova,
  • G. V. Kan,
  • I. V. Tikhonova,
  • E. G. Sorokovikova,
  • E. A. Rymareva,
  • N. S. Chebunina,
  • O. I. Belykh

摘要

Abstract—

The data on alkaline phosphatase activity (APA) in Lake Baikal bays (Mukhor and Chivyrkuy) are presented. In June 2023 and 2024, APA varied from 667 to 3206 nmol/(L day), i.e., it was an order of magnitude higher than the values for the lake pelagic stations. To assess the contribution of bacterioplankton to APA, the following size fractions were studied: phytoplankton (>5 μm), picoplankton (1.2–5 μm), and bacterioplankton (0.2–1.2 μm). The share of bacterioplankton in the total APA was shown to be 45–56%, except for the Mukhor Bay in 2023, when its contribution was minimal (22%). In general, the share of bacterioplankton in APA was considerably higher then the values reported worldwide, which may be related to the uniqueness of the Lake Baikal ecosystem.