Hydrological and Hydrochemical Characteristics of the Iron-Manganese Meromictic Freshwater Lake Svetloe (Arkhangelsk Region)

Kokryatskaya, N. M.; Chupakov, Artem V.; Titova, Kseniya V.; Chupakova, Anna A.; Zabelina, Svetlana A.; Moreva, Olga Y.; Neverova, Natalia; Zhibareva, Tatyana A.

doi:10.17516/1997-1389-0036

Cited by 3 publications

(6 citation statements)

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“…The methane cycle in Lake Svetloe is fairly well known [33][34][35][36][37][38]. The microbial com munities participating in the methane cycle are represented by several genera of meth anogens and methanotrophs typical of freshwater lakes [35].…”

Section: Site Descriptionmentioning

confidence: 99%

“…This work presents the first data on the spatiotemporal dynamics of the concentrations of organic and inorganic nitrogen forms in the subarctic meromictic Lake Svetloe (NW Russia). The lake is a rare type of freshwater meromictic water body with high concentrations of dissolved methane and ferrous iron, manganese, and low concentrations of sulfates and sulfides in the hypolimnion [34,36,39,40]. Iron-rich and sulfur-depleted meromictic lakes with conditions suitable for photoferrotrophy are considered modern analogues of the ancient Archean Ocean [21,41].…”

Section: Introductionmentioning

confidence: 99%

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Distribution of Dissolved Nitrogen Compounds in the Water Column of a Meromictic Subarctic Lake

et al. 2021

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In order to better understand the biogeochemical cycle of nitrogen in meromictic lakes, which can serve as a model for past aquatic environments, we measured dissolved concentrations of nitrate, nitrite, ammonium, and organic nitrogen in the deep (39 m maximal depth) subarctic Lake Svetloe (NW Russia). The lake is a rare type of freshwater meromictic water body with high concentrations of methane, ferrous iron, and manganese and low concentrations of sulfates and sulfides in the monimolimnion. In the oligotrophic mixolimnion, the concentration of mineral forms of nitrogen decreased in summer compared to winter, likely due to a phytoplankton bloom. The decomposition of the bulk of the organic matter occurs under microaerophilic/anaerobic conditions of the chemocline and is accompanied by the accumulation of nitrogen in the form of N-NH4 in the monimolimnion. We revealed a strong relationship between methane and nitrogen cycles in the chemocline and monimolimnion horizons. The nitrate concentrations in Lake Svetloe varied from 9 to 13 μM throughout the water column. This fact is rare for meromictic lakes, where nitrate concentrations up to 13 µM are found in the monimolimnion zone down to the bottom layers. We hypothesize, in accord with available data for other stratified lakes that under conditions of high concentrations of manganese and ammonium at the boundary of redox conditions and below, anaerobic nitrification with the formation of nitrate occurs. Overall, most of the organic matter in Lake Svetloe undergoes biodegradation essentially under microaerophilic/anaerobic conditions of the chemocline and the monimolimnion. Consequently, the manifestation of the biogeochemical nitrogen cycle is expressed in these horizons in the most vivid and complex relationship with other cycles of elements.

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Section: Site Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Distribution of Dissolved Nitrogen Compounds in the Water Column of a Meromictic Subarctic Lake

et al. 2021

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“…The main hydrological parameters of the lake are presented elsewhere [34,39,40]. Seasonal water temperature variation occurs to a depth of 22 meters; further below, the water temperature decreases with a gradient of about 0.7 °C/m and below 27 meters, the water temperature is in the range of 3.5-3.6 °C all year round.…”

Section: Main Hydrochemical Characteristicsmentioning

confidence: 99%

“…The methane cycle in Lake Svetloe is fairly well known [33][34][35][36][37][38]. The microbial communities participating in the methane cycle are represented by several genera of methanogens and methanotrophs typical of freshwater lakes [35].…”

Section: Introductionmentioning

confidence: 99%

“…This work presents the first data on the spatiotemporal dynamics of the concentrations of organic and inorganic nitrogen forms in the subarctic meromictic Lake Svetloe (NW Russia). The lake is a rare type of freshwater meromictic water bodies with high concentrations of dissolved methane and ferrous iron, manganese, and low concentrations of sulfates and sulfides in the hypolimnion [34,36,39,40]. Iron-rich and sulfur-depleted meromictic lakes with conditions suitable for photoferrotrophy are considered modern analogues of the ancient Archean ocean [21,41].…”

Section: Introductionmentioning

confidence: 99%

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Distribution of Dissolved Nitrogen Compounds in the Water Column of a Meromictic Subarctic Lake

Vorobyeva¹,

Chupakova²,

Chupakov³

et al. 2021

Preprint

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In order to better understand the biogeochemical cycle of nitrogen in meromictic lakes, which can serve as a model for past aquatic environments, we measured dissolved concentrations of nitrate, nitrite, ammonium and organic nitrogen in deep (39 m maximal depth) subarctic Lake Svetloe (NW Russia). The lake is a rare type of freshwater meromictic water boy with high concentrations of methane, ferrous iron, manganese and low concentrations of sulfates and sulfides in the monimolimnion. In the oligotrophic mixolimnion, the concentration of mineral forms of nitrogen decreased in summer compared to winter, likely due to phytoplankton bloom. The decomposition of the bulk of organic matter occurs under microaerophilic/anaerobic conditions of the chemocline and accompanied by the accumulation of nitrogen in the form of N-NH4 in the monimonimlion. We revealed a strong relationship between methane and nitrogen cycles in the chemocline and monimolimnion horizons. The nitrate concentrations in Lake Svetloe varied in the range from 9 to 13 μM throughout the water column. This fact is rare for meromictic lakes, where nitrate concentrations up to 13 µM are found in the monimolimnion zone down to the bottom layers. We hypothesize, in accord with available data for other stratified lakes, that under conditions of high concentrations of manganese and ammonium at the boundary of redox conditions and below, anaerobic nitrification with the formation of nitrates occurs. Overall, most of organic matter in Lake Svetloe undergoes biodegradation essentially under microaerophilic/anaerobic conditions of the chemocline and the monimolimnion. Consequently, the manifestation of the biogeochemical nitrogen cycle is expressed in these horizons in the most vivid and complex relationship with other cycles of elements.

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Hydrochemical Characteristics of Lakes of Different Types on the Bolshoi Solovetskii Island

Titova,

Kokryatskaya,

Popov

et al. 2024

Water Resour

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Hydrological and Hydrochemical Characteristics of the Iron-Manganese Meromictic Freshwater Lake Svetloe (Arkhangelsk Region)

Cited by 3 publications

References 0 publications

Distribution of Dissolved Nitrogen Compounds in the Water Column of a Meromictic Subarctic Lake

Distribution of Dissolved Nitrogen Compounds in the Water Column of a Meromictic Subarctic Lake

Distribution of Dissolved Nitrogen Compounds in the Water Column of a Meromictic Subarctic Lake

Hydrochemical Characteristics of Lakes of Different Types on the Bolshoi Solovetskii Island

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