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<p>Ten shallow lakes of a human-impacted region of Argentina (Pampa), selected across a gradient of temperature and moisture, were monthly monitored during three years. We analyzed the spatial–temporal changes in phytoplankton diversity (species richness and the local contribution to β-diversity—LCBD), and the role of the local environmental conditions and the spatial factors in structuring the communities. Lakes with extreme environmental conditions (high inorganic turbidity or high conductivity) showed lowest species richness and a distinctive composition that differs markedly from other lakes, which was evidenced by high LCBD driven by turnover. Lakes of the more impacted zones showed homogenization of the phytoplankton composition, sharing species typical of eutrophic systems, and blooms of harmful cyanobacteria. Temporal changes were associated to the combined effect of temperature and water level, registering species abundance peaks in warm periods, and decreases in total phytoplankton abundances associated to higher water levels. Local conditions—such as trophic status, turbidity, and conductivity—played a greater role in shaping phytoplankton communities than geographic position. These factors, together with temporal variability, were key drivers of community changes. The in-depth analysis of phytoplankton diversity and the main factors influencing its variability provide key information for the managements of these lakes.</p>

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Extreme environmental conditions and land use drive phytoplankton turnover and homogenization across a climatic gradient

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • Irina Izaguirre,
  • M. Laura Sánchez,
  • M. Romina Schiaffino,
  • Inés O’Farrell,
  • Gerardo Cueto,
  • Paula Huber,
  • Miguel Mancini,
  • Fabián Grosman,
  • Josefina Zunino

摘要

Ten shallow lakes of a human-impacted region of Argentina (Pampa), selected across a gradient of temperature and moisture, were monthly monitored during three years. We analyzed the spatial–temporal changes in phytoplankton diversity (species richness and the local contribution to β-diversity—LCBD), and the role of the local environmental conditions and the spatial factors in structuring the communities. Lakes with extreme environmental conditions (high inorganic turbidity or high conductivity) showed lowest species richness and a distinctive composition that differs markedly from other lakes, which was evidenced by high LCBD driven by turnover. Lakes of the more impacted zones showed homogenization of the phytoplankton composition, sharing species typical of eutrophic systems, and blooms of harmful cyanobacteria. Temporal changes were associated to the combined effect of temperature and water level, registering species abundance peaks in warm periods, and decreases in total phytoplankton abundances associated to higher water levels. Local conditions—such as trophic status, turbidity, and conductivity—played a greater role in shaping phytoplankton communities than geographic position. These factors, together with temporal variability, were key drivers of community changes. The in-depth analysis of phytoplankton diversity and the main factors influencing its variability provide key information for the managements of these lakes.