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Chinese Journal of Oceanology and Limnology 2015年第6期33卷 1378-1390页

作者： evgeniya.ma.yugina.natalia belkova Institute of Natural Resources Ecology and CryologySiberian Branch of the Russian Academy of Sciences Limnological Institute Siberian Branch of the Russian Academy of Sciences Irkutsk State University

Meromictic soda and saline lakes are unique ecosystems characterized by the stability of physical,chemical and biological parameters,and they are distributed all over the *** located in regions with average annual negative air temperature are of particular interest because of the presence of two periods with intensive and dynamic processes:the so-called biological summer and the long ice season with the biological *** Lake Doroninskoe is located in Eastern Transbaikalia(51°14′N,112°14′E) in the permafrost zone in an extreme continental climate,and is covered by ice for seven months per *** structure and diversity of the microbial communities throughout the water column of the lake was studied by 16 S r RNA gene amplicon *** species with specific functions were found to dominate at different *** flexible bacteria with a capacity to switch between anoxygenic photosynthesis and aerobic chemotrophic metabolism dominate in soda Lake Doroninskoe.

关键词： bacterial diversity soda lake meromixis Lake Doroninskoe 16S rRNA genes high-throughput amplicon sequencing

Phylogenetic Diversity of Microorganisms from Chemocline of the Meromictic Soda Lake Doroninskoe(Zabaikalie,Russia)

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 153-154页

作者： evgeniya.ma.yugina.natalia belkova Institute of Natural Resources Ecology and Cryology of the Siberian Branch of the Russian Academy of Sciences Limnological Institute of the Siberian Branch of the Russian Academy of Sciences Irkutsk State University

1 Introduction many soda and salt lakes are characterized by the formation of the meromictic conditions under which a part of the water column is not involved in the annual process of mixing(mac Intyre,Melack,1982).Th... 详细信息

关键词： Diversity,Soda Lake,Meromixis,Lake Doroninskoe,16S r RNA Gene Phylogeny.

Vertical Distribution of Bacteria in Doroninskoe Lake(Zabaikalie,Russia):Paradigm of Dominance

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 53-55页

作者： natalia belkova evgeniya maTyugina Limnological Institute of the Siberian Branch of the Russian Academy of Sciences Irkutsk State University Institute of Natural Resources Ecology and Cryology of the Siberian Branch of the Russian Academy of Sciences

1 Introduction Prokaryotes are key organisms in aquatic ecosystems as they play animportant role in the biogeochemical cycling of *** on the relationships betweenthe diversity of microbial community and environmentalf... 详细信息

关键词： Soda Lake Doroninskoe Bacterial Diversity 16S rRNA Gene High-Throughput AmpliconSequencing

Structure and diversity dynamics of microbial communities at day and night:investigation of meromictic Lake Doroninskoe,Transbaikalia,Russia

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Journal of Oceanology and Limnology 2018年第6期36卷 1978-1992页

作者： evgeniya.ma.yugina.natalia belkova Svetlana BORZENKO Pavel LUKYANOV marsel KABILOV Olga BATURINA Alexandra maRTYNOVA-VAN KLEY Armen NALIAN Aleksei PTITSYN Institute of Natural Resources Ecology and Cryology SB RASChitaRussia Limnological Institute SB RAS IrkutskRussia Institute of Chemical Biology and Fundamental Medicine NovosibirskRussia Stephen F.Austin State University TXUSA

Extreme environmental conditions are key factors in the formation of the structure and diversity of microbial communities. In meromictic ecosystems, extreme conditions and a stable stratification of physical, chemical and biological parameters lead to diversity and heterogeneity of microenvironments. Lake Doroninskoe is located in an extreme geographical area and diff ers from other known meromictic reservoirs of the world by a low level of illumination in the chemocline and a rare type of alkaline water in sedimentary rocks formed by evaporative concentration. To understand the key factors that shape the composition and structure of the microbial community, the macro-and micro-variations in space and time are of great importance. We investigated the short-term dynamics of the structure and diversity of microbial communities of the meromictic soda lake, Lake Doroninskoe, at day and night using highthroughput sequencing and bioinformatics. Metagenomic analysis of 16 S rRNA gene amplicons showed that the microbial communities had a high taxonomic diversity both at day and night. Sixteen bacterial and three archaeal phyla were identified. Proteobacteria were dominant and comprised 75% during the day, increasing to 90% at night. Metabolically stable denitrifying bacteria that were able to use a variety of alternative electron acceptors and electron donors were prevalent in Lake Doroninskoe. They belonged to the families Enterobacteriaceae(class Gammaproteobacteria) and Alcaligenaceae(class Betaproteobacteria). Statistically significant differences between day and night microbial communities were found. During the day, the microbial community was the most diverse. We discuss the peculiarities of the underexplored shortterm dynamics of the structure and diversity of the microbial communities of the meromictic soda Lake Doroninskoe, and propose topics for prospective studies.

关键词： bacterial diversity day-night dynamics meromixis Lake Doroninskoe high-throughput amplicon sequencing