Ferromanganese Sedimentary Layers and Nodules of Lake Baikal
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  • Release Date: 2022-11-01
  • microbial communities
  • diversity of 16S rRNA sequences
  • Fe-Mn nodules
  • deep sediments
  • Lake Baikal
Video Introduction

This video is adapted from 10.3390/d14100868

Ferromanganese (Fe-Mn) sedimentary layers and nodules occur at different depths within sediments at deep basins and ridges of Lake Baikal. Researchers studied Fe-Mn nodules and host sediments recovered at the slope of Bolshoy Ushkany Island. Layer-by-layer 230Th/U dating analysis determined the initial age of the Fe-Mn nodule formation scattered in the sediments as 96 ± 5–131 ± 8 Ka. The distribution profiles of the main ions in the pore waters of the studied sediment are similar to those observed in the deep-sea areas of Lake Baikal, while the chemical composition of Fe-Mn nodules indicates their diagenetic formation with hydrothermal influence. Among the bacteria in microbial communities of sediments, members of organoheterotrophic Gammaproteobacteria, Chloroflexi, Actinobacteriota, Acidobacteriota, among them Archaea—chemolithoautotrophic ammonia-oxidizing archaea Nitrososphaeria, dominated. About 13% of the bacterial 16S rRNA gene sequences in Fe-Mn layers belonged to Methylomirabilota representatives which use nitrite ions as electron acceptors for the anaerobic oxidation of methane (AOM). Nitrospirota comprised up to 9% of the layers of Bolshoy Ushkany Island. In bacterial communities of Fe-Mn nodule, a large percentage of sequences were attributed to Alphaproteobacteria, Actinobacteriota and Firmicutes, as well as a variety of OTUs with a small number of sequences characteristic of hydrothermal ecosystems.

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Zemskaya, T.;  Lomakina, A.;  Konstantinova, N.;  Shubenkova, O.;  Pogodaeva, T.;  Ivanov, V.;  Bukin, S.;  Khabuev, A.;  Khlystov, O.;  Vilkin, G. Ferromanganese Sedimentary Layers and Nodules of Lake Baikal. Encyclopedia. Available online: https://encyclopedia.pub/video/video_detail/459 (accessed on 24 June 2024).
Zemskaya T,  Lomakina A,  Konstantinova N,  Shubenkova O,  Pogodaeva T,  Ivanov V, et al. Ferromanganese Sedimentary Layers and Nodules of Lake Baikal. Encyclopedia. Available at: https://encyclopedia.pub/video/video_detail/459. Accessed June 24, 2024.
Zemskaya, Tamara, Anna Lomakina, Natalia Konstantinova, Olga Shubenkova, Tatyana Pogodaeva, Vyacheslav Ivanov, Sergei Bukin, Andrey Khabuev, Oleg Khlystov, Grigory Vilkin. "Ferromanganese Sedimentary Layers and Nodules of Lake Baikal" Encyclopedia, https://encyclopedia.pub/video/video_detail/459 (accessed June 24, 2024).
Zemskaya, T.,  Lomakina, A.,  Konstantinova, N.,  Shubenkova, O.,  Pogodaeva, T.,  Ivanov, V.,  Bukin, S.,  Khabuev, A.,  Khlystov, O., & Vilkin, G. (2022, November 01). Ferromanganese Sedimentary Layers and Nodules of Lake Baikal. In Encyclopedia. https://encyclopedia.pub/video/video_detail/459
Zemskaya, Tamara, et al. "Ferromanganese Sedimentary Layers and Nodules of Lake Baikal." Encyclopedia. Web. 01 November, 2022.
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