Ecology of Meromictic Lakes

Gulati, R. D.; Zadereev, Egor; Degermendzhy, Andrey G.

doi:10.1007/978-3-319-49143-1

Cited by 38 publications

(4 citation statements)

References 48 publications

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“…In addition to surface water tributaries, the lake is fed by underwater springs passing through gypsum-rich dolomite rock and transporting salts, including sulfate, to the bottom water. Water from these springs create an anaerobic, sulfidic monimolimnion with high salinity and an aerobic, low-salinity mixolimnion, both separated by a chemocline at 10–14 m depth [17,18].…”

Section: Methodsmentioning

confidence: 99%

“…Lake Cadagno (maximal depth 21 m) is a crenogenic meromictic lake located in the southern slopes of the Swiss Alps. The lake is permanently stratified with a chemocline between 10 and 14 m depth [17,18]. Sulfide gradients in the chemocline foster the development of a particular bacterial community dominated by phototrophic sulfur bacteria, mainly purple sulfur bacteria (PSB) of the family Chromatiaceae (phylum Proteobacteria) [17,19], and green sulfur bacteria (GSB) of the family Chlorobiaceae (phylum Chlorobi) [20,21].…”

Section: Introductionmentioning

confidence: 99%

“…However, yet unknown differences in other functional characteristics of the species involved are required to explain their coexistence [27]. Although anoxygenic phototrophic sulfur bacteria are confined to the chemocline, they interact with the bacterial community in adjacent strata of the water column [18]. For instance, strong interactions have been shown with sulfate-reducing bacteria (SRB) in the chemocline and the anoxic monimolimnion [28,29].…”

Section: Introductionmentioning

confidence: 99%

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Bacterial diversity in the water column of meromictic Lake Cadagno and evidence for seasonal dynamics

et al. 2018

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The meromictic Lake Cadagno is characterized by a compact chemocline with high concentrations of anoxygenic phototrophic purple and green sulfur bacteria. However, a complete picture of the bacterial diversity, and in particular of effects of seasonality and compartmentalization is missing. To characterize bacterial communities and elucidate relationships between them and their surrounding environment high-throughput 16S rRNA gene pyrosequencing was conducted. Proteobacteria, Chlorobi, Verrucomicrobia, and Actinobacteria were the dominant groups in Lake Cadagno water column. Moreover, bacterial interaction within the chemocline and between oxic and anoxic lake compartments were investigated through fluorescence in situ hybridization (FISH) and flow cytometry (FCM). The different populations of purple sulfur bacteria (PSB) and green sulfur bacteria (GSB) in the chemocline indicate seasonal dynamics of phototrophic sulfur bacteria composition. Interestingly, an exceptional bloom of a cyanobacteria population in the oxic-anoxic transition zone affected the common spatial distribution of phototrophic sulfur bacteria with consequence on chemocline location and water column stability. Our study suggests that both bacterial interactions between different lake compartments and within the chemocline can be a dynamic process influencing the stratification structure of Lake Cadagno water column.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bacterial diversity in the water column of meromictic Lake Cadagno and evidence for seasonal dynamics

et al. 2018

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“…These deep, oligomictic, or meromictic lakes are subjects that inevitably impact human activities and climate warming (Fukushima et al, 2018). As a tropical country, Indonesia has tiny annual temperature variations and differences in surface and bottom water temperatures (Tonolla et al, 2017). As is known, the variation of temperature cause the change in density gradient in the water column and will change the intensity and duration of mixing, stability of temperature, and thermocline afterward (Mosello et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Phytoplankton Dynamics and Its Relation to Physicochemical Parameters in the Dry Season of Maninjau Lake, West Sumatra, Indonesia

Komala,

Silvia,

Windi

2023

J. Ecol. Eng.

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Physicochemical parameters play a significant role in determining phytoplankton structure and dynamics in the lake. The present study investigated the phytoplankton dynamics and their correlation with physicochemical parameters in the dry season of Maninjau Lake. The parameters measured, including temperature, transparency, pH, DO, TN, and TP concentrations, were collected from seven lake locations, i.e., in the middle of the lake, near domestic, hydropower, endemic fisheries, and aquaculture cage areas, and inlet-outlet rivers. Phytoplankton samples were collected from the middle of the lake, near domestic and aquaculture cage areas. TSI analysis shows that Maninjau Lake was hypereutrophic, with an average TSI of 101.15. The phytoplankton community comprises six classes and 22 species dominated by Microcystis aeroginosa and Synedra acus. Bacillariophyceae had the highest phytoplankton concentration, while Cyanophyceae had the highest density. The diversity and equity index of the phytoplankton community structure were low and less evenly distributed, confirming that the lake was hypereutrophic. The highest diversity index was found in the middle of the lake or the most profound part, while the lowest was near the domestic area. Among the physicochemical parameters, transparency has a strong correlation with dominant phytoplankton.

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A Holocene high‐resolution record of aquatic productivity, seasonal anoxia and meromixis from varved sediments of Lake Łazduny, North‐Eastern Poland: insight from a novel multi‐proxy approach

Sanchini

Szidat

Tylmann

et al. 2020

J Quaternary Science

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Anthropogenic eutrophication and spreading anoxia in freshwater systems is a global concern. Little is known about anoxia in earlier historic times under weaker human impact, or under prehistoric natural conditions with different trophic, land cover and climatic regimes. We use a novel approach that combines high-resolution hyperspectral imaging with µ-XRF and HPLC-pigment data, which allows us to assess chloropigments (productivity) and bacteriopigments (anoxia) at seasonal subvarve-scale resolution. Our~9700 cal a BP varved sediment record from NE Poland suggests that productivity increased stepwise from oligotrophic Early Holocene conditions (until 9200 cal a BP) to mesotrophic conditions in the Mid-and Late Holocene. Natural eutrophication was mainly a function of progressing landscape evolution with intense weathering under dense forest and warm-moist climatic conditions. Generally, anoxia increased with increasing productivity. Seasonal anoxia and some multi-decadal periods of meromixis were the common mixing patterns throughout the Holocene except for a period of persisting meromixis between~5200 and 2000 cal a BP. Anthropogenic deforestation around 400 cal a BP resulted in substantially better lake oxygenation despite high productivity. In this small lake, aquatic productivity and lakeshore forest cover (wind shield) were more important factors controlling oxic/anoxic conditions than Holocene temperature variability.

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Ecology of Meromictic Lakes

Cited by 38 publications

References 48 publications

Bacterial diversity in the water column of meromictic Lake Cadagno and evidence for seasonal dynamics

Bacterial diversity in the water column of meromictic Lake Cadagno and evidence for seasonal dynamics

Phytoplankton Dynamics and Its Relation to Physicochemical Parameters in the Dry Season of Maninjau Lake, West Sumatra, Indonesia

A Holocene high‐resolution record of aquatic productivity, seasonal anoxia and meromixis from varved sediments of Lake Łazduny, North‐Eastern Poland: insight from a novel multi‐proxy approach

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