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

FERMANI, P.; LAGOMARSINO, L.; TORREMORELL, A.; ESCARAY, R.; BUSTINGORRY, J.; LLAMES, M.; PÉREZ, G.L.; ZAGARESE, H.; MATALONI, G.

ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS.

ACAD BRASILEIRA DE CIENCIAS

Lugar: Rio de Janeiro; Año: 2020

0001-3765

Nearby shallow lakes experience the same climatic drivers andtheir regional influence is examined by the degree of coherence of different parameters. Pampa region of Argentina encompasses many shallow lakes which are affected by hydrometeorological conditions as well as human impact.From an ecosystem management perspective and taking into account that microorganisms play a fundamental role in water bodies, we studied a clear and a turbid shallow lake during an annual cycle in order to evaluate if they respond similarly to external factors. Abiotics variables were more coherent than biological ones, but they are insufficient to explain microorganisms dynamicswhich are mainly affected by local effects and their seasonal patterns were different from those found in shallow temperate lakes ofNorthern Hemisphere.Heterotrophic bacteria and picoeukaryote were regulated by the availability of resources, but these would not be the main carbon sources for heterotrophic organisms; andlike in others tropical lakes, picocyanobacteria would be the main supply for flagellates and ciliates.Due to disparities between climate trends for both hemispheres this work contributes to an advance to understand how the effects of environmental variation influence the microbial communities in two shallow lakes with contrasting alternative states in the Southern Hemisphere