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Study of microbial communities in redox zone of meromictic lakes isolated from the White Sea using spectral and molecular methods Krasnova, E.D.; Kharcheva, A.V.; Milyutina, I.A.; Voronov, D.A.; Patsaeva, S.V. (2015). Study of microbial communities in redox zone of meromictic lakes isolated from the White Sea using spectral and molecular methods. J. Mar. Biol. Ass. U.K. 95(8): 1579-1590. https://dx.doi.org/10.1017/S0025315415000582 In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154; e-ISSN 1469-7769 Ook verschenen in: Sukhotin, A.; Frost, M.; Hummel, H. (Ed.) (2015). Proceedings of the 49th European Marine Biology Symposium September 8-12, 2014, St. Petersburg, Russia. European Marine Biology Symposia, 49. Journal of the Marine Biological Association of the United Kingdom, 95(8). 1517-1721 pp., meer

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Beschikbaar in	Auteurs
VLIZ: Non-open access 292369 [ aanvragen ]

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Trefwoord

Marien/Kust

Author keywords

Meromictic lake; chemocline; redox zone; absorption and fluorescencespectra; chlorophyll; bacteriochlorophyll; microbial community; WhiteSea

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Auteurs		Top
Krasnova, E.D. Kharcheva, A.V. Milyutina, I.A.	Voronov, D.A. Patsaeva, S.V.

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Abstract

Due to postglacial isostatic uplift many stratified lakes, at different stages of isolation, are located along the shores of the White Sea. In five lakes, located near the White Sea Biological Station of Moscow State University, salinity, temperature, pH, concentration of dissolved oxygen, redox potential, and illuminance were measured. Distribution of microorganisms and spectral properties of water layers were also studied. All the lakes had a narrow bright coloured layer in the redox zone caused by mass development of phototropic microorganisms. Light absorption and fluorescence spectra indicated algae containing chlorophyll a predominate in the red water layers while the colouration of green and brown layers is caused by green sulphur bacteria with bacteriochlorophylls d and e. Sunlight is completely absorbed in the redox zone because of the high density of algae and/or bacteria, resulting in aphotic conditions below. Coloured layers act as a specific biotope for special communities of microorganisms. Eukaryotes identified by the 18S rRNA gene included different species of mixotrophic algae and ciliates resistant to anoxia. The water layer colour and spectral characteristics (i.e. light absorption and fluorescence) of water in the redox zone can be considered indicators of the stage of lake isolation from the sea, with the red colour caused by cryptophyte alga Rhodomonas sp. bloom found in earlier stages and brown and green colours caused by green sulphur bacteria in later stages.

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