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<p>The Lagunas de Montebello National Park (PNLM) in Chiapas, Mexico, is an ecologically significant area that contains several lakes, including “La Encantada,” a karstic, eutrophic lake. This study aimed to assess the physicochemical characteristics and microbial community structure of the sediments from "La Encantada" over a six-year period (2017–2024), during dry and rainy seasons. We collected sediment samples from three sites, measuring in situ parameters like temperature, pH, dissolved oxygen, and electrical conductivity. Additionally, we analyzed heavy metal concentrations (Cr, Mn, Fe, Co, Ni, Cu, As, Pb, Cd) using ICP-OES. DNA was extracted from the sediments for metagenomic analysis, and microbial communities were characterized by 16S rRNA gene sequencing. Results showed significant temporal variation in temperature and pH, with a decrease in heavy metal concentrations over time, suggesting a possible improvement in water quality. Microbial diversity was highest during the low water season of 2024, with shifts in dominant bacterial phyla, particularly a decrease in <i>Proteobacteria</i> and <i>Planctomycetota</i>, and an increase in taxa like <i>Microbacterium</i> and <i>Bacillus</i>. Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt) analysis revealed changes in microbial metabolic activity, such as degradation of xenobiotic compounds and methanogenesis, including a decrease in carbohydrate and amino acid metabolism in 2024, possibly linked to environmental changes. These findings highlight the dynamic nature of the lake ecosystem and the influence of environmental factors on microbial communities.</p>

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Temporal Comparison and the Effect on Methanogenic Microbial Communities in Eutrophic Lake Sediments

  • 期刊论文

  • 发表日期：

    2025年10月2日

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  • Josué Alegría-Gómez,
  • Jorge Arturo García-Rodríguez,
  • José Humberto Castañón-González,
  • Reiner Rincón-Rosales,
  • Arnulfo Rosales-Quintero,
  • Víctor Manuel Ruíz-Valdiviezo

摘要

The Lagunas de Montebello National Park (PNLM) in Chiapas, Mexico, is an ecologically significant area that contains several lakes, including “La Encantada,” a karstic, eutrophic lake. This study aimed to assess the physicochemical characteristics and microbial community structure of the sediments from "La Encantada" over a six-year period (2017–2024), during dry and rainy seasons. We collected sediment samples from three sites, measuring in situ parameters like temperature, pH, dissolved oxygen, and electrical conductivity. Additionally, we analyzed heavy metal concentrations (Cr, Mn, Fe, Co, Ni, Cu, As, Pb, Cd) using ICP-OES. DNA was extracted from the sediments for metagenomic analysis, and microbial communities were characterized by 16S rRNA gene sequencing. Results showed significant temporal variation in temperature and pH, with a decrease in heavy metal concentrations over time, suggesting a possible improvement in water quality. Microbial diversity was highest during the low water season of 2024, with shifts in dominant bacterial phyla, particularly a decrease in Proteobacteria and Planctomycetota, and an increase in taxa like Microbacterium and Bacillus. Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt) analysis revealed changes in microbial metabolic activity, such as degradation of xenobiotic compounds and methanogenesis, including a decrease in carbohydrate and amino acid metabolism in 2024, possibly linked to environmental changes. These findings highlight the dynamic nature of the lake ecosystem and the influence of environmental factors on microbial communities.