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Year-Round Presence of Microcystins and Toxin-Producing Microcystis in the Water Column and Ice Cover of a Eutrophic Lake Located in the Continuous Permafrost Zone (Yakutia, Russia)

Toxins, 2023-07, Vol.15 (7), p.467 [Peer Reviewed Journal]

2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;2023 by the authors. 2023 ;EISSN: 2072-6651 ;DOI: 10.3390/toxins15070467 ;PMID: 37505736

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Title:
Year-Round Presence of Microcystins and Toxin-Producing Microcystis in the Water Column and Ice Cover of a Eutrophic Lake Located in the Continuous Permafrost Zone (Yakutia, Russia)
Author: Gabyshev, Viktor A ; Sidelev, Sergey I ; Chernova, Ekaterina N ; Vilnet, Anna A ; Davydov, Denis A ; Barinova, Sophia ; Gabysheva, Olga I ; Zhakovskaya, Zoya A ; Voronov, Ivan V
Subjects: Biomass ; Biosynthesis ; Cell density ; Chemical oxygen demand ; continuous permafrost zone ; Cyanobacteria ; Environmental DNA ; Eutrophic environments ; Eutrophic lakes ; Eutrophication ; Ice ; Ice Cover ; Lakes ; Lakes - microbiology ; Light microscopy ; Microcystins ; Microcystins - analysis ; Microcystis ; Microcystis - genetics ; Microcystis spp ; Nitrogen ; Nucleotides ; Optical microscopy ; Overwintering ; Permafrost ; Phylogeny ; Plankton ; RNA, Ribosomal, 16S - genetics ; rRNA 16S ; rRNA 23S ; Spectrometry ; Toxins ; Water - analysis ; Water circulation ; Water column ; Water temperature ; year-round study
Is Part Of: Toxins, 2023-07, Vol.15 (7), p.467
Description: This study aimed to test the hypothesis of the year-round presence of toxigenic and cyanotoxins in the water and ice of the shallow eutrophic Lake Ytyk-Kyuyol located in the continuous permafrost zone. Three independent approaches-mass-spectrometry, molecular methods and light microscopy-were applied in the study. The cyanobacterial biomass ranged from 1.0 × 10 to 4.8 mg L . and were the dominant morphospecies in plankton throughout the observation. In environmental DNA, the presence of was supported and gene regions responsible for microcystin biosynthesis were detected through a BLAST (Basic Local Alignment Search Tool) search and phylogenetic estimation based on newly obtained 16S rRNA, 16S-23S ITS rRNA, A and E nucleotide sequences. The intracellular microcystin concentration ranged from <0.1 to 803 ng L , and the microcystin quota in the biomass was extremely low. For the first time, it was shown that cells containing genes and microcystins presented permanently in the water column, both during the ice-free period and under ice, as well as inside thick ice covers within 7 months of severe winter. We hypothesized that minor pelagic and ice populations of could participate in increasing cell density in the spring. However, further studies are needed to confirm the viability of the overwintering colonies in the water and inside the ice of Lake Ytyk-Kyuyol.
Publisher: Switzerland: MDPI AG
Language: English
Identifier: EISSN: 2072-6651
DOI: 10.3390/toxins15070467
PMID: 37505736
Source: MEDLINE
PubMed Central
ROAD: Directory of Open Access Scholarly Resources
ProQuest Central
DOAJ Directory of Open Access Journals

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Year-Round Presence of Microcystins and Toxin-Producing Microcystis in the Water Column and Ice Cover of a Eutrophic Lake Located in the Continuous Permafrost Zone (Yakutia, Russia)

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