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May 27, 2026Microbiology0 citations

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

MSM. Yu. SuslovaSiberian Branch of the Russian Academy of Sciences GKG.V. KanSiberian Branch of the Russian Academy of Sciences ИТИ. В. ТихоноваSiberian Branch of the Russian Academy of Sciences

Key Points

This research aims to evaluate the variability of alkaline phosphatase activity in Lake Baikal bays and the contribution of the bacterial community.
Data collection in Lake Baikal bays (Mukhor and Chivyrkuy) during June 2023 and 2024.
Measurement of alkaline phosphatase activity across different size fractions: phytoplankton, picoplankton, and bacterioplankton.
Comparison of bacterioplankton contribution to total alkaline phosphatase activity.
Alkaline phosphatase activity varied significantly, ranging from 667 to 3206 nmol/(L day).
Bacterioplankton contributed 45–56% to total alkaline phosphatase activity, with a minimal contribution of 22% in Mukhor Bay in 2023.
The bacterioplankton share in alkaline phosphatase activity was notably higher than global averages, suggesting a unique ecological context.

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.

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