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| Titel |
Prokaryotic diversity in the extreme lakes of Turkey, SW Anatolia, Turkey |
| VerfasserIn |
Cansu Demirel, Nevin Gül Karagüler, Meryem Menekşe-Kılıç, Sena Akçer-Ön, Haydar A. Gültekin, Nurgul Balci |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250121617
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| Publikation (Nr.) |
 EGU/EGU2016-405.pdf |
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| Zusammenfassung |
| The Lake District, located in the SW Anatolia region of Turkey, hosts a number of lakes
with unique water chemistry. Among them, Lake Acigol, Lake Salda and Lake
Yarisli display extreme biogeochemical conditions. In terms of their water chemistry
and diverse prokaryotic community, each lake sets a great example for microbially
mediated reactions (e.g carbonate precipitation). Lake Acigol (average pH around
8.6) is known for hypersaline and alkaline water chemistry. Lake Salda (average
pH around 9.1) is known for its hydromagnesite beaches, clayey-hydromagnesite
shoreline and ancient-modern stromatolite formations as well as being a model for
Mars. For the first time, Lake Yarisli having alkaline conditions with an average
pH value of 9.5 is investigated for its geochemistry and geobiology during this
study. Algal bloom and well developed cyanobacterial mats are visible on shallow
waters along the Eastern shoreline of the lake. In scope of elucidating complex
bio/geochemical reactions that regulate C, S and O cycles in the extreme conditions
of these lakes, water, surface sediment and shallow core samples were collected.
For the first time, prokaryotic diversity of Lake Acigol, Salda and Yarisli were
determined by Next-Generation Sequencing (NGS) during this study (Balci et al.,
2013).
Preliminary results revealed the total number of bacterial classes determined for Lake
Acigol, Lake Salda and Lake Yarisli as 22, 19 and 19; respectively. Lake Acigol, Salda and
Yarisli are mostly dominated by bacterial classes of Alphaproteobacteria (68.2%, 25.6% and
1.9%; respectively), Cyanobacteria (10.2%, 5.3% and 92.9%; respectively), Bacilli (9.6%,
23.7% and 0.45%; respectively), Gammaproteobacteria (6.1%, 39.6% and 4.3%;
respectively) and Actinobacteria (2.7%, 1.8% and 0.06%; respectively). The total number of
archaeal classes determined for Lake Acigol, Lake Salda and Lake Yarisli are 8, 7 and 6;
respectively. Common most dominant archaeal classes of Lake Acigol, Lake Salda
and Lake Yarisli are comprised of Methanobacteria (51.7%, 76.1% and 61.2%;
respectively), Halobacteria (48%, 21.4% and 38.5%; respectively), Thaumarchaeota
(0.002%, 1.4% and 0.02%; respectively), Thermoplasmata (0.1%, 0.8% and 0.1%;
respectively) and Methanomicrobia (0.1%, 0.06% and 0.2%; respectively). Numerous
numbers of bacterial and archaeal classes determined in the lakes are indicators of
diverse biogeochemical cycles in such extreme conditions. Elucidating survival
strategies of microorganisms in such extreme conditions may provide valuable
information about extraterrestrial life. In this respect, Carnobacterium viridians,
previously used as model microorganism for Mars (Nicholson et al., 2013),identified
in sediments of Lake Salda may hold important implications for extraterrestrial
research.
Key words: Lake Acigol, Lake Salda, Lake Yarisli, Turkey, extreme lakes,
biogeochemistry, carbonate biomineralization, Next-Generation Sequencing, extremophiles
References
Balci et al. (2013). Experimental investigation of microbial influences on carbonat
precipitation in evaporatic environments: A Case Study, Acı gol, Denizli. TUBITAK
(The Scientific and Technological Research Council of Turkey) Grant to N. BALCI
(113Y464).
Nicholson, W.L., Krivushin, K., Gilichinsky, D., Schuerger, A.C. (2013). Growth of
Carnobacterium spp. from permafrost under low pressure, temperature, and anoxic
atmosphere has implications for Earth microbes on Mars. Proc. Natl. Acad. Sci. USA., 110(2),
666-671, January 8. |
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