Taxonomic composition of Lake Baikal bacterioneuston communities

Galachyants, A. D.; Belkova, Natalia; Sukhanova, E. V.; Galachyants, Yuri P.; Morozov, A. A.; Парфенова, В. В.

doi:10.1134/s0026261717020084

Cited by 10 publications

(3 citation statements)

References 28 publications

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“…16S rRNA gene diversity of Lake Baikal bacterioneuston and bacterioplankton communities was similar to that described by Galach’yants et al (2017), Mikhailov et al (2015, 2019), and Kurilkina et al (2016) [ 62 , 63 , 64 , 65 ]. The dominant phyla in Lake Baikal neuston and plankton were Cyanobacteria, Actinobacteria, Proteobacteria, Bacteroidetes, and Verrucomicrobia.…”

Section: Discussionsupporting

confidence: 85%

“…In the current work, Firmicutes and Fusobacteria were also referred to as the major phyla. The other phyla detected were Planctomycetes, Acidobacteria, Armatimonadetes, Chloroflexi, Deinococcus-Thermus, Gemmatimonadetes, Nitrospirae, and Firmicutes [ 62 , 63 , 64 , 65 ]. These phyla are known to be common in all freshwater bodies [ 66 ].…”

Section: Discussionmentioning

confidence: 99%

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Diversity of Aerobic Anoxygenic Phototrophs and Rhodopsin-Containing Bacteria in the Surface Microlayer, Water Column and Epilithic Biofilms of Lake Baikal

et al. 2021

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The diversity of aerobic anoxygenic phototrophs (AAPs) and rhodopsin-containing bacteria in the surface microlayer, water column, and epilithic biofilms of Lake Baikal was studied for the first time, employing pufM and rhodopsin genes, and compared to 16S rRNA diversity. We detected pufM-containing Alphaproteobacteria (orders Rhodobacterales, Rhizobiales, Rhodospirillales, and Sphingomonadales), Betaproteobacteria (order Burkholderiales), Gemmatimonadetes, and Planctomycetes. Rhodobacterales dominated all the studied biotopes. The diversity of rhodopsin-containing bacteria in neuston and plankton of Lake Baikal was comparable to other studied water bodies. Bacteroidetes along with Proteobacteria were the prevailing phyla, and Verrucomicrobia and Planctomycetes were also detected. The number of rhodopsin sequences unclassified to the phylum level was rather high: 29% in the water microbiomes and 22% in the epilithon. Diversity of rhodopsin-containing bacteria in epilithic biofilms was comparable with that in neuston and plankton at the phyla level. Unweighted pair group method with arithmetic mean (UPGMA) and non-metric multidimensional scaling (NMDS) analysis indicated a distinct discrepancy between epilithon and microbial communities of water (including neuston and plankton) in the 16S rRNA, pufM and rhodopsin genes.

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Diversity of Aerobic Anoxygenic Phototrophs and Rhodopsin-Containing Bacteria in the Surface Microlayer, Water Column and Epilithic Biofilms of Lake Baikal

et al. 2021

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“…In particular, Nikitin estimated the total bacterial abundance and number of cultured heterotrophic bacteria at several stations in the southern basin of the lake [ 30 ]. Later in 2016 the investigation of neuston in Lake Baikal was continued: diversity and physiological and biochemical properties of heterotrophic bacteria isolated from neuston have been studied and then in 2017 taxonomic composition of bacterioneuston communities was examined [ 31 , 32 ]. Nevertheless, there have been no studies of the bacterioneuston abundance in Lake Baikal since the 1970s.…”

Section: Introductionmentioning

confidence: 99%

Bacterioneuston in Lake Baikal: Abundance, Spatial and Temporal Distribution

Galachyants¹,

Томберг²,

Sukhanova³

et al. 2018

IJERPH

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An aquatic surface microlayer covers more than 70% of the world’s surface. Our knowledge about the biology of the surface microlayer of Lake Baikal, the most ancient lake on Earth with a surface area of 31,500 km2, is still scarce. The total bacterial abundance, the number of cultured heterotrophic temporal bacteria, and the spatial distribution of bacteria in the surface microlayer and underlying waters of Lake Baikal were studied. For the first time, the chemical composition of the surface microlayer of Lake Baikal was determined. There were significant differences and a direct relationship between the total bacterial abundance in the surface microlayer and underlying waters of Lake Baikal, as well as between the number of cultured heterotrophic bacteria in studied water layers in the period of summer stratification. In the surface microlayer, the share of cultured heterotrophic bacteria was higher than in the underlying waters. The surface microlayer was characterized by enrichment with PO43−, total organic carbon and suspended particulate matter compared to underlying waters. A direct relationship was found between the number of bacteria in the surface microlayer and environmental factors, including temperature, total organic carbon and suspended particulate matter concentration.

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