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Extracellular enzymatic activity serves as a sensitive gauge for environmental shifts, particularly in aquatic environments. This study explores the influence of natural and human-induced factors on enzymatic activity in two freshwater ecosystems in western Cuba. Various environmental parameters were assessed across multiple sampling stations along the Almendares and San Juan Rivers, including water and sediment measurements. Enzymatic activity, including protease, acid and alkaline phosphatases, lipases, and catalase, was measured in both water and sediment samples. The study revealed spatial and temporal variations in enzymatic activities within ecosystems. Redundancy analysis (RDA) showed that nutrient concentrations, chemical oxygen demand (COD) and heavy metals in sediments explain enzymatic activity variations. In the water column, factors such as total heterotrophs, phosphates, pH, and COD strongly influenced enzymatic activities in the Almendares River, while chlorophyll a, nitrites, thermotolerant coliforms, temperature, and rainfall played key roles in the San Juan River. The combined assessment of these enzymatic activities offers valuable insights for monitoring freshwater ecosystem health.

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Enzymatic Responses of Freshwater Microbial Communities to Fecal and Chemical Pollution

  • 章节

  • 发表日期：

    2025年

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  • Jeny Adina Larrea Murrell,
  • Beatriz Romeu Alvarez,
  • Alice L. Petre,
  • Adrian Salcedo Gómez,
  • Daysi Lugo Moya,
  • Marcia María Rojas Badía,
  • Karina Boltes

摘要

Extracellular enzymatic activity serves as a sensitive gauge for environmental shifts, particularly in aquatic environments. This study explores the influence of natural and human-induced factors on enzymatic activity in two freshwater ecosystems in western Cuba. Various environmental parameters were assessed across multiple sampling stations along the Almendares and San Juan Rivers, including water and sediment measurements. Enzymatic activity, including protease, acid and alkaline phosphatases, lipases, and catalase, was measured in both water and sediment samples. The study revealed spatial and temporal variations in enzymatic activities within ecosystems. Redundancy analysis (RDA) showed that nutrient concentrations, chemical oxygen demand (COD) and heavy metals in sediments explain enzymatic activity variations. In the water column, factors such as total heterotrophs, phosphates, pH, and COD strongly influenced enzymatic activities in the Almendares River, while chlorophyll a, nitrites, thermotolerant coliforms, temperature, and rainfall played key roles in the San Juan River. The combined assessment of these enzymatic activities offers valuable insights for monitoring freshwater ecosystem health.