Alkaline Phosphatase Activity and Phosphatase-Active Bacteria in Lake Baikal Water Column and Major Tributaries

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Resumo

Phosphorus is one of the major biogenic elements. Its inflow facilitates eutrophication of lake water. In aquatic ecosystems, phosphorus is present mostly in organic compounds. Ability of aquatic microorganisms to assimilate phosphorus from organophosphorous compounds results from activity of alkaline phosphatases; activity of these enzymes may be an indicator of the state of the ecosystem, phosphate load, and water quality. In the present work, alkaline phosphatase activity (APA) and abundance of phosphatase-active bacteria (PAB) in Lake Baikal pelagic zone and in the mouths of its major tributaries was studied. In the pelagic zone, APA and PAB abundance decreased with depth, indicating that the main processes of phosphate generation occurred in the trophic layer of the lake. In the main tributaries, both APA and PAB abundance were considerably higher than in the pelagic zone. These results indicate active biochemical processes of transformation of organophosphorous compounds occur in the estuarine zones of the rivers. The degradation processes result in regeneration of phosphates, which are completely incorporated in the biological turnover, providing for phytoplankton development.

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Sobre autores

M. Suslova

Limnological Institute, Siberian Branch, Russian Academy of Sciences

Autor responsável pela correspondência
Email: suslova@lin.irk.ru
Rússia, Irkutsk, 664033

G. Podlesnaya

Limnological Institute, Siberian Branch, Russian Academy of Sciences

Email: suslova@lin.irk.ru
Rússia, Irkutsk, 664033

I. Tomberg

Limnological Institute, Siberian Branch, Russian Academy of Sciences

Email: suslova@lin.irk.ru
Rússia, Irkutsk, 664033

M. Sakirko

Limnological Institute, Siberian Branch, Russian Academy of Sciences

Email: suslova@lin.irk.ru
Rússia, Irkutsk, 664033

O. Belykh

Limnological Institute, Siberian Branch, Russian Academy of Sciences

Email: suslova@lin.irk.ru
Rússia, Irkutsk, 664033

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2. Fig. 1. Map of sampling stations (a); The number of FAB and ASF in the water column of the southern, middle and northern basins of the lake. Baikal in June 2021-2023 (b).

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3. Fig. 2. ASF in the estuary sections of the main tributaries of the lake. Baikal in June 2021-2023.

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