Anais da Academia Brasileira de Ciências (Jan 2022)

Divergent dynamics of microbial components in two temperate shallow lakes with contrasting steady states in the Southern Hemisphere

  • PAULINA FERMANI,
  • LEONARDO LAGOMARSINO,
  • ANA TORREMORRELL,
  • ROBERTO ESCARAY,
  • JOSÉ BUSTINGORRY,
  • MARÍA LLAMES,
  • GONZALO PÉREZ,
  • HORACIO ZAGARESE,
  • GABRIELA MATALONI

DOI
https://doi.org/10.1590/0001-3765202220191545
Journal volume & issue
Vol. 94, no. 1

Abstract

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Abstract Factors that affect abundances of organisms in water bodies are influenced by extrinsic and intrinsic drivers that operate from outside and within a system. A high temporal coherence in the dynamics of abiotic parameters and biological communities among neighboring lakes evidences a strong extrinsic control operating similarly across lakes, and allows for prediction of ecosystems evolution in the context of global change and intensive land use. The Pampa region (Argentina) encompasses many shallow lakes submitted to different degrees of anthropic influence and showing contrasting alternative states. We studied an eutrophic clear and a hypertrophic turbid shallow lake during an annual cycle in order to evaluate whether they responded similarly to extrinsic factors or these were overridden by the effects of the steady state of each lake. Physical and chemical variables were highly coherent between both lakes, but accounted little for the large disparities among abundances and dynamics of microorganisms. While communities from the clear lake responded to a combination of extrinsic and intrinsic factors, the turbid lake showed a state less prone to be affected by climatic effects. We hypothesize that clear lakes would perform better as sentinels of climate change in the Pampa wetland.

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