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Bacterioplankton Zonation Does Exist in High Elevation, Polymictic Lakes.

Pablo Aguilar1,2,3, Irma Vila3,4, Ruben Sommaruga1

  • 1Lake and Glacier Ecology Research Group, Department of Ecology, University of Innsbruck, Innsbruck, Austria.

Frontiers in Microbiology
|March 7, 2022
PubMed
Summary
This summary is machine-generated.

Bacterial communities in high-elevation tropical lakes show vertical zonation, even without temperature gradients. This microbial zonation, influenced by microdiversity, is key to understanding these unique aquatic ecosystems.

Keywords:
16S rRNA geneAndean plateaubacterioplankton diversitypolymictic lakeswater column

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Area of Science:

  • Aquatic microbiology
  • Ecosystem ecology
  • Limnology

Background:

  • Planktonic microbe distribution is vital for ecosystem function.
  • Polymictic lakes, unlike stratified ones, often show homogeneous bacterial distribution.
  • Limited knowledge exists on bacterial patterns in polymictic lakes beyond temperature effects.

Purpose of the Study:

  • To investigate bacterial zonation along the water column in high-elevation polymictic lakes.
  • To assess bacterial diversity, microdiversity, and community composition at discrete depths.
  • To determine if vertical spatial zonation occurs in the absence of clear thermal stratification.

Main Methods:

  • Analysis of bulk DNA and active bacterial fraction (cDNA) from 16S rRNA genes.
  • Sampling at discrete depths in three high-elevation Andean lakes (4,400-4,550 m).
  • Assessment of bacterial community composition and microdiversity.

Main Results:

  • Significant vertical spatial zonation of bacterial communities was found in two of the three lakes studied.
  • Microdiversity played a role in the observed zonation patterns.
  • No clear vertical gradients in temperature or oxygen were detected.

Conclusions:

  • Bacterial zonation can occur in polymictic high-elevation lakes independent of thermal stratification.
  • Findings provide a baseline for understanding impacts of climate change on these sensitive ecosystems.
  • Ecological studies should include the entire water column in polymictic systems.