Hidrológiai Közlöny, 2015 (95. évfolyam)
2015 / 5-6. különszám - LVI. Hidrobiológus Napok előadásai
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(2006) Ye- osuana aromativorans gen. nov., sp. nov., a mesophilic marine bacterium belonging to the family Flavobacteriaceae, isolated from estuarine sediment of the South Sea, Korea. - Int. J. Syst. E- vol. Microbiol. 56: 727-732. Kwon, K. K, Lee, H. S., Yang, S. H„ Kim, S. J. (2005) Kordiimonas gwangyangensis gen. nov., sp. nov., a marine bacterium isolated from marine sediments that forms a distinct phyletic lineage (Kor- diimonadales ord. nov.) in the 'Alphaproteobacteria'. - Int. J. Syst. Evol. Microbiol. 55: 2033-2037. Labrenz, M, Hirsch, P. (2001) Physiological diversity and adaptations of aerobic bacteria from different depths of hypersaiine, heliother- mal, and meromictic Ekho Lake (East Antarctica). - Polar Biol. 24: 320-327. Maclsaac E. A., StocknerJ. G. (1993) Enumeration of phototrophic pi- coplankton by autofluorescence microscopy. In: Kemp, P.F., Sherr, B. F., Sherr, E. B., Cole, J. J. (szerk.), Handbook of methods in aquatic microbial ecology. Lewis Publishers./?/?. 187-197. Márialigeti, K, Borsodi, A., Felföldi, T, Romsics, Cs., Tóth, E., Máthé, I. (2014) Ivóvíz, ásványvíz, gyógyvíz, fürdővíz — A mikrobák kettős szerepben: a létrehozásért vagy a romlásért felelősek? - A Kárpát-medence ásványvizei X. Nemzetközi Tudományos Konferencia (Csíkszereda, Románia, 2014. augusztus 28-31.), konferenciakiadvány. pp. 19-31. Máthé, 1., Borsodi, A. K, Tóth, E. M„ Felföldi, T, Jurecska, L., Krett, G., Kelemen, Zs., Elekes, E., Barkács, K, Márialigeti, K. (2014) Vertical physico-chemical gradients with distinct microbial communities in the hypersaiine and heliothermal Lake Ursu (Sovata, Romania). - Extremophiles 18:501-514. Mentes, A., Keresztes, Zs. Gy., Hegyi, A., Márialigeti, K., Máthé, I., Somogyi, B., Vörös, L„ Felföldi, T. (2014) Tengeri pikocianobaktéri- umok Erdély sós tavaiban. - Hidrológiai Közlöny 94: 19-22. Oren, A. (2013) Salinibacter: an extremely halophilic bacterium with archaeal properties. - FEMS Microbiol. Lett. 342: 1-9. Somogyi, B., Vörös, L., Páljfy, K, Székely, Gy., Bartha, Cs., Keresztes, Zs. Gy. (2014) Picophytoplankton predominance in hypersaiine lakes (Transylvanian Basin, Romania). - Extremophiles 186: 1075- 1084. Sorokin, D. Y, van Pelt, S., Tourova, T. P., Evtushenko, L. 1. (2009) Nitriliruptor alkaliphilus gen. nov., sp. nov., a deep-lineage haloal- kaliphilic actinobacterium from soda lakes capable of growth on a- liphatic nitriles, and proposal of Nitriliruptoraceae fam. nov. and Nitriliruptorales ord. nov. - Int. J. Syst. Evol. Microbiol. 59: 248- 253. Utermöhl, H. (1958) Zur Vervollkommnung der quantitative Phyto- plankton-Methodik.-M/«. Int. Ver. Theor. Angew. Limnol. 9:1-38. Vaz-Moreira, I., Nobre, M. F., Nunes, O. C., Manaia, C. M. (2007) Pseudosphingobacterium domesticum gen. nov., sp. nov., isolated from home-made compost. - Int. J. Syst. Evol. Microbiol. 57: 1535-1538. Wellbum, A. R. (1994) The spectral determination of chlorophylls a and b, as well as total carotenoids, using various solvents with spectrophotometers of different resolution. - J. Plant. Physiol. 144: 307-313. Wetzel, R. G. (2001) Limnology. - Academic Press. Zhilina, T. N., Zavarzina, D. G., Kolganova, T. V, Turova, T. P., Zavarzin, G. A. (2005) "Candidatus Contubemalis alkalaceticum", an obligately syntrophic alkaliphilic bacterium capable of anaerobic acetate oxidation in a coculture with Desulfonatronum cooperati- vum. - Mikrobiologiia 746:800-809. Planktonic microbial communities of heliothermal saline lakes Nagy, B. J., Szabó, A., Somogyi, B., Vörös, L., Márialigeti, K., Máthé, I. and Felföldi, T. Abstract: Certain saline lakes possess a special thermal stratification, called heliothermy, when solar heating results in an underwater temperature maximum. In July 2013, three deep, heliothermal, saline lakes were studied in Romania (region Transylvania), which had different human impact. Lake Färä Fund in Ocna Sibiului is a strictly protected nature conservation area, Lake Ursu in Sovata is used as a health spa including open-air bathing during summer, and ‘Lake Plus’ in Ocna Mure§ is highly polluted (it had formed in 2010 due to the collapse of a salt mine-shaft that entombed a complete supermarket). Physicochemical analysis revealed that steep stratification existed in all lakes, having a transition zone at around 2-4 meters depth, with the highest temperature (33.2-41.7 °C) and the highest chlorophyll concentration. In Lake Färä Fund, the phytoplankton was dominated by Dunaliella sp., while a characteristic stratification of picoeukaryotic algae and green sulfur bacteria were detected in Lake Ursu. Next-generation DNA sequencing revealed the dominance of phyla Bacteri- odetes, Cyanobacteria, Proteobacteria, Firmicutes (and additionally Chlorobi in Lake Ursu). The euphotic zone of Lake Färä Fund was dominated with genus Salinibacter (red-colored bacterium with a light-driven proton pump). Strictly anaerobic genera (e.g. the sulfate- reducing genus Desulfonauticus) were characteristic in the deeper zones of the lakes. The results have shown that heliothermal saline lakes may harbor unique and special microbial communities. Keywords: heliothermy, saline lake, Transylvania, next-generation DNA sequencing, planktonic microorganisms.
