Soda lake

Geology, geochemistry and genesis

In order for a lake to become alkalic, a special combination of geographical, geological and climatic conditions are required. First of all, a suitable topography is needed, that limits the outflow of water from the lake. When the outflow is completely prevented, this is called an endorheic basin. Craters or depressions formed by tectonic rifting often provide such topological depressions.

There are exceptions to the "no outlet" rule: both Lake Kivu and Lake Tanganyika have outlets but also have the characteristics of soda lakes, and Lake Tanganyika even grows microbialites.

The high alkalinity and salinity arise through evaporation of the lake water. This requires suitable climatic conditions, in order for the inflow to balance outflow through evaporation. The rate at which carbonate salts are dissolved into the lake water also depends on the surrounding geology and can in some cases lead to relatively high alkalinity even in lakes with significant outflow.

Another critical geological condition for the formation of a soda lake is the relative absence of soluble magnesium or calcium. Otherwise, dissolved magnesium (Mg2+) or calcium (Ca2+) will quickly remove the carbonate ions, through the precipitation of minerals such as calcite, magnesite or dolomite, effectively neutralizing the pH of the lake water. This results in a neutral (or slightly basic) salt lake instead. A good example is the Dead Sea, which is very rich in Mg2+. In some soda lakes, inflow of Ca2+ through subterranean seeps, can lead to localized precipitation. In Mono Lake, California and Lake Van, Turkey, such precipitation has formed columns of tufa rising above the lake surface.

Many soda lakes are strongly stratified, with a well-oxygenated upper layer (epilimnion) and an anoxic lower layer (hypolimnion), without oxygen and often high concentrations of sulfide. Stratification can be permanent, or with seasonal mixing. The depth of the oxic/anoxic interface separating the two layers varies from a few centimeters to near the bottom sediments, depending on local conditions. In either case, it represents an important barrier, both physically and between strongly contrasting biochemical conditions.

Biodiversity

A rich diversity of microbial life inhabit soda lakes, often in dense concentrations. This makes them unusually productive ecosystems and leads to permanent or seasonal "algae blooms" with visible colouration in many lakes. The colour varies between particular lakes, depending on their predominant life forms and can range from green to orange or red.

Compared to freshwater ecosystems, life in soda lakes is often completely dominated by prokaryotes, i.e. bacteria and archaea, particularly in those with more "extreme" conditions (higher alkalinity and salinity, or lower oxygen content). However, a rich diversity of eukaryotic algae, protists and fungi have also been encountered in many soda lakes.

Multicellular animals such as crustaceans (notably the brine shrimp Artemia and the copepod Paradiaptomus africanus) and fish (e.g. Alcolapia), are also found in many of the less extreme soda lakes, adapted to the extreme conditions of these alkalic and often saline environments. Particularly in the East African Rift Valley, microorganisms in soda lakes also provide the main food source for vast flocks of the lesser flamingo (Phoeniconaias minor). The cyanobacteria of the genus Arthrospira (formerly Spirulina) are a particularly preferred food source for these birds, owing to their large cell size and high nutritional value. Declines in East African soda lake productivity due to rising water levels threaten this food source. This may force lesser flamingos to move north and south, away from the equator.

Microbial diversity surveys and species richness

In general, the microbial biodiversity of soda lakes is relatively poorly studied. Many studies have focused on the primary producers, namely the photosynthesizing cyanobacteria or eukaryotic algae (see Carbon cycle). As studies have traditionally relied on microscopy, identification has been hindered by the fact that many soda lakes harbour poorly studied species, unique to these relatively unusual habitats and in many cases thought to be endemic, i.e. existing only in one lake. The morphology (appearance) of algae and other organisms may also vary from lake to lake, depending on local conditions, making their identification more difficult, which has probably led to several instances of taxonomic confusions in the scientific literature.

Recently, a number of studies have used molecular methods such as DNA fingerprinting or sequencing to study the diversity of organisms in soda lakes. For microorganisms, the phylogenetic marker gene small subunit (SSU) ribosomal RNA is typically targeted, due to its good properties such as existence in all cellular organisms and ability to be used as a "molecular clock" to trace the evolutionary history of an organism. For instance, 16S ribosomal RNA gene clone libraries revealed that the bacterial community of the lake with the highest salinity was characterized by a higher recent accelerated diversification than the community of a freshwater lake, whereas the phylogenetic diversity in the hypersaline lake was lower than that in a freshwater lake. Culture-independent surveys have revealed that the diversity of microorganisms in soda lakes is very high, with species richness (number of species present) of individual lakes often rivaling that of freshwater ecosystems.

Biogeography and uniqueness

In addition to their rich biodiversity, soda lakes often harbour many unique species, adapted to alkalic conditions and unable to live in environments with neutral pH. These are called alkaliphiles. Organisms also adapted to high salinity are called haloalkaliphiles. Culture-independent genetic surveys have shown that soda lakes contain an unusually high amount of alkaliphilic microorganisms with low genetic similarity to known species. This indicates a long evolutionary history of adaptation to these habitats with few new species from other environments becoming adapted over time.

In-depth genetic surveys also show an unusually low overlap in the microbial community present, between soda lakes with slightly different conditions such as pH and salinity. This trend is especially strong in the bottom layer (hypolimnion) of stratified lakes, probably because of the isolated character of such environments. Diversity data from soda lakes suggest the existence of many endemic microbial species, unique to individual lakes.

Ecology

Carbon cycle

Photosynthesis provides the primary energy source for life in soda lakes and this process dominates the activity at the surface. The most important photosynthesizers are typically cyanobacteria, but in many less "extreme" soda lakes, eukaryotes such as green algae (Chlorophyta) can also dominate. Major genera of cyanobacteria typically found in soda lakes include Arthrospira (formerly Spirulina) (notably A. platensis), Anabaenopsis, Cyanospira, Synechococcus or Chroococcus. In more saline soda lakes, haloalkaliphilic archaea such as Halobacteria and bacteria such as Halorhodospira dominate photosynthesis. However, it is not clear whether this is an autotrophic process or if these require organic carbon from cyanobacterial blooms, occurring during periods of heavy rainfall that dilute the surface waters.

Below the surface, anoxygenic photosynthesizers using other substances than carbon dioxide for photosynthesis also contribute to primary production in many soda lakes. These include purple sulfur bacteria such as Ectothiorhodospiraceae and purple non-sulfur bacteria such as *Rhodobacteraceae *(for example the species Rhodobaca bogoriensis isolated from Lake Bogoria{{Cite journal

The photosynthesizing bacteria provide a food source for a vast diversity of aerobic and anaerobic organotrophic microorganisms from phyla including Pseudomonadota, Bacteroidota, Spirochaetota, Bacillota, Thermotogota, Deinococcota, Planctomycetota, Actinomycetota, Gemmatimonadota, and more. The stepwise anaerobic fermentation of organic compounds originating from the primary producers, results in one-carbon (C1) compounds such as methanol and methylamine.

At the bottom of lakes (in the sediment or hypolimnion, methanogens use these compounds to derive energy, by producing methane, a procedure known as methanogenesis. A diversity of methanogens including the archaeal genera Methanocalculus, Methanolobus, Methanosaeta, Methanosalsus and Methanoculleus have been found in soda lake sediments. When the resulting methane reaches the aerobic water of a soda lake, it can be consumed by methane-oxidizing bacteria such as Methylobacter or Methylomicrobium.

Sulfur cycle

Sulfur-reducing bacteria are common in anoxic layers of soda lakes. These reduce sulfate and organic sulfur from dead cells into sulfide (S2−). Anoxic layers of soda lakes are therefore often rich in sulfide. As opposed to neutral lakes, the high pH prohibits the release of hydrogen sulfide (H2S) in gas form. Genera of alkaliphilic sulfur-reducers found in soda lakes include Desulfonatronovibrio and Desulfonatronum. These also play important an ecological role besides in the cycling of sulfur, as they also consume hydrogen, resulting from the fermentation of organic matter.

Sulfur-oxidating bacteria instead derive their energy from oxidation of the sulfide reaching the oxygenated layers of soda lakes. Some of these are photosynthetic sulfur phototrophs, which means that they also require light to derive energy. Examples of alkaliphilic sulfur-oxidizing bacteria are the genera Thioalkalivibrio, Thiorhodospira, Thioalkalimicrobium and Natronhydrogenobacter.

Nitrogen and other nutrients

Nitrogen is a limiting nutrient for growth in many soda lakes, making the internal nitrogen cycle very important for their ecological functioning. One possible source of bio-available nitrogen is diazotrophic cyanobacteria, which can fix nitrogen from the atmosphere during photosynthesis. However, many of the dominant cyanobacteria found in soda lakes such as Arthrospira are probably not able to fix nitrogen. Ammonia, a nitrogen-containing waste product from degradation of dead cells, can be lost from soda lakes through volatilization because of the high pH. This can hinder nitrification, in which ammonia is "recycled" to the bio-available form nitrate. However, ammonia oxidation seems to be efficiently carried out in soda lakes in either case, probably by ammonia-oxidizing bacteria as well as Thaumarchaea.

List of soda lakes

File:Pangong_Tso_lake.jpg|Pangong Lake, India and Tibet, China File:Owens Lake, California.JPG|Astronaut photograph of the mostly dry bed of Owens Lake, California, US File:Sambhar Salt LakeWW.jpg|2010 satellite image of Sambhar Salt Lake, India File:Lake Eyasi, Tanzania satellite image.png|Lake Eyasi, Tanzania File:Flamingos at lake Nakuru.jpg|Flamingos feeding at Lake Nakuru, Kenya File:Lake_turkana.jpg|Lake Turkana, Kenya File:Salt Lake Satonda.jpg|Satonda Island lake, Indonesia File:Satellite view of Niuafo'ou, 2005-03-19.jpg|Niuafo'ou lake, Tonga File:Lago-di-venere.jpg|Lake Specchio di Venere, Pantelleria island, Italy The following table lists some examples of soda lakes by region, listing country, pH and salinity. NA indicates 'data not available':

Industrial use

Many water-soluble chemicals are extracted from the soda lake waters worldwide. Lithium carbonate (see Lake Zabuye), potash (see lake Lop Nur and Qinghai Salt Lake Potash), soda ash (see Lake Abijatta and Lake Natron), etc. are extracted in large quantities. Lithium carbonate is a raw material in production of lithium which has applications in lithium storage batteries widely used in modern electronic gadgets and electrically powered automobiles. Water of some soda lakes are rich in dissolved uranium carbonate. Algaculture is carried out on a commercial scale with soda lake water.

Explanatory notes

References

References

1. Grant, W. D.. (2006). "Extremophiles". Eolss Publishers Co.; UNESCO.
2. (1974). "Photosynthetic rates of phytoplankton in East African alkaline, saline lakes". Limnol. Oceanogr..
3. (January 2011). "Encyclopedia of Geobiology".
4. Handelsman J. (2004). "Metagenomics: application of genomics to uncultured microorganisms". Microbiol Mol Biol Rev.
5. Wang J. (2011). "Do Patterns of Bacterial Diversity along Salinity Gradients Differ from Those Observed for Macroorganisms?". PLOS ONE.
6. Baas-Becking, Lourens G.M.. (1934). "Geobiologie of inleiding tot de milieukunde". W.P. Van Stockum & Zoon.
7. (2012). "Deep underwater seismic explosion experiments and their possible ecological impact – the case of Lake Arenguade – Central Ethiopian highlands". Limnologica - Ecology and Management of Inland Waters.
8. (July 2012). "Molecular diversity of methanogens and identification of Methanolobus sp. as active methylotrophic Archaea in Lonar crater lake sediments". FEMS Microbiol. Ecol..
9. (2008). "Nitrification in Mono Lake, California: Activity and community composition during contrasting hydrological regimes". Limnology and Oceanography.
10. (1986). "Saline lake ecosystems of the world". Kluwer Academic Publishers.
11. (1983). "Hydrogeochemistry of Lake Turkana, Kenya: Mass balance and mineral reactions in an alkaline lake". Geochimica et Cosmochimica Acta.
12. (2011). "Time-course gait analysis of hemiparkinsonian rats following 6-hydroxydopamine lesion". Behavioural Brain Research.
13. (2009). "Low Taxon Richness of Bacterioplankton in High-Altitude Lakes of the Eastern Tibetan Plateau, with a Predominance of Bacteroidetes and Synechococcus spp.". Applied and Environmental Microbiology.
14. (January 1992). "Glacial and lake fluctuations in the area of the west Kunlun mountains during the last 45000 years". Annals of Glaciology.
15. T.V. Ramachandra. (February 2011). "Environmental impact assessment of the national large solar telescope project and its ecological impact in Merak area".
16. [https://www.sibran.ru/upload/iblock/11e/11ecb90bb2a633cf26757afca20371fd.pdf состав рассолов и минеральная зональность донных отложений содовых озер КулундинскОЙ степИ (Западная Сибирь)]
17. (2009). "Characterization of photoautotrophic picoplankton assemblages in turbid, alkaline lakes of the Carpathian Basin (Central Europe)". Journal of Limnology.
18. (2013). "Planktonic bacterial community composition of an extremely shallow soda pond during a phytoplankton bloom revealed by cultivation and molecular cloning". Extremophiles.
19. (April 2016). "Carbonate precipitation in the alkaline lake Specchio di Venere (Pantelleria Island, Italy) and the possible role of microbial mats". Applied Geochemistry.
20. (May 2019). "Alkaline soda Lake Velika Rusanda (Serbia): the first insight into diatom diversity of this extreme saline lake". Extremophiles.
21. (September 2019). "A shared core microbiome in soda lakes separated by large distances". Nature Communications.
22. (June 2009). "Geo-chemical Behavior of Uranium in the Sambhar Salt Lake, Rajasthan (India): Implications to "Source" of Salt and Uranium "Sink"". Aquat Geochem.