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<b>Abstract</b>— <p>The paper presents data on prokaryotic communities of water and bottom sediments of the Lakes Opogra and Sorozh’e. The lakes are humic, freshwater, low-mineralized, and slightly acidic. By sequencing the variable V3–V4 regions of the16S rRNA genes, it was found that prokaryotes of the bottom sediments of Lake Opogra belonged to the phyla <i>Halobacteriota</i>, <i>Methanobacteriota</i>, and <i>Acidobacteriota</i>, while those of Lake Sorozh’e, to the phyla <i>Aenigmarchaeota</i>, <i>Thermoproteota</i>, and <i>Bacillota</i>. Both lakes were characterized by a significant presence of representatives of the phyla <i>Pseudomonadota, Chloroflexota</i>, and <i>Actinomycetota</i> in the sediments. The common phyla in the water column of both lakes were <i>Pseudomonadota, Actinomycetota</i>, and <i>Bacteroidota</i>. The dominants of Lake Opogra water were the families <i>Comamonadaceae</i>, <i>Ilumatobacteraceae</i>, <i>Phycisphaeraceae</i>, and members of the phylum <i>Cyanobacteriota</i>, while Lake Sorozh’e was dominated by the families <i>Sporichthyaceae</i>, <i>Methylophilaceae</i>, <i>Methylomonadaceae</i>, and the representatives of <i>Verrucomicrobiia</i>. The most abundant families of the anaerobic bottom layer of Lake Sorozh’e were <i>Prolixibacteraceae</i>, <i>Chlorobiaceae</i>, and <i>Desulfomonilaceae</i>.</p>

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Prokaryotic Communities of the Water Column and Bottom Sediments of Freshwater Humic Lakes of Northwestern Russia (Arkhangelsk Oblast)

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • T. I. Lovdina,
  • A. S. Aksenov,
  • A. V. Chupakov,
  • S. A. Zabelina,
  • S. D. Prasolov,
  • A. A. Chupakova,
  • O. Yu. Moreva

摘要

Abstract—

The paper presents data on prokaryotic communities of water and bottom sediments of the Lakes Opogra and Sorozh’e. The lakes are humic, freshwater, low-mineralized, and slightly acidic. By sequencing the variable V3–V4 regions of the16S rRNA genes, it was found that prokaryotes of the bottom sediments of Lake Opogra belonged to the phyla Halobacteriota, Methanobacteriota, and Acidobacteriota, while those of Lake Sorozh’e, to the phyla Aenigmarchaeota, Thermoproteota, and Bacillota. Both lakes were characterized by a significant presence of representatives of the phyla Pseudomonadota, Chloroflexota, and Actinomycetota in the sediments. The common phyla in the water column of both lakes were Pseudomonadota, Actinomycetota, and Bacteroidota. The dominants of Lake Opogra water were the families Comamonadaceae, Ilumatobacteraceae, Phycisphaeraceae, and members of the phylum Cyanobacteriota, while Lake Sorozh’e was dominated by the families Sporichthyaceae, Methylophilaceae, Methylomonadaceae, and the representatives of Verrucomicrobiia. The most abundant families of the anaerobic bottom layer of Lake Sorozh’e were Prolixibacteraceae, Chlorobiaceae, and Desulfomonilaceae.