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Predominance of deterministic microbial community dynamics in salterns exposed to different light intensities.

Authors
  • Viver, Tomeu1
  • Orellana, Luis H2
  • Díaz, Sara1
  • Urdiain, Mercedes1
  • Ramos-Barbero, María Dolores3
  • González-Pastor, José E4
  • Oren, Aharon5
  • Hatt, Janet K2
  • Amann, Rudolf6
  • Antón, Josefa3
  • Konstantinidis, Konstantinos T2
  • Rosselló-Móra, Ramon1
  • 1 Marine Microbiology Group, Department of Animal and Microbial Biodiversity, Mediterranean Institute for Advanced Studies (IMEDEA, CSIC-UIB), Esporles, Spain. , (Spain)
  • 2 School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA. , (Georgia)
  • 3 Department of Physiology, Genetics and Microbiology, University of Alicante, Alicante, Spain. , (Spain)
  • 4 Laboratory of Molecular Adaptation, Department of Molecular Evolution, Centro de Astrobiología, Consejo Superior de Investigaciones Científicas - Instituto Nacional de Técnica Aeroespacial, Madrid, Spain. , (Spain)
  • 5 Department of Plant and Environmental Sciences, The Institute of Life Sciences, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem, 9190401, Israel. , (Israel)
  • 6 Department of Molecular Ecology, Max-Planck-Institut für Marine Mikrobiologie, Bremen, D-28359, Germany. , (Germany)
Type
Published Article
Journal
Environmental Microbiology
Publisher
Wiley (Blackwell Publishing)
Publication Date
Nov 01, 2019
Volume
21
Issue
11
Pages
4300–4315
Identifiers
DOI: 10.1111/1462-2920.14790
PMID: 31444990
Source
Medline
Language
English
License
Unknown

Abstract

While the dynamics of microbial community assembly driven by environmental perturbations have been extensively studied, our understanding is far from complete, particularly for light-induced perturbations. Extremely halophilic communities thriving in coastal solar salterns are mainly influenced by two environmental factors-salt concentrations and high sunlight irradiation. By experimentally manipulating light intensity through the application of shading, we showed that light acts as a deterministic factor that ultimately drives the establishment of recurrent microbial communities under near-saturation salt concentrations. In particular, the stable and highly change-resistant communities that established under high-light intensities were dominated (>90% of metagenomic reads) by Haloquadratum spp. and Salinibacter spp. On the other hand, under 37-fold lower light intensity, different, less stable and change-resistant communities were established, mainly dominated by yet unclassified haloarchaea and relatively diverse photosynthetic microorganisms. These communities harboured, in general, much lower carotenoid pigment content than their high-irradiation counterparts. Both assemblage types appeared to be highly resilient, re-establishing when favourable conditions returned after perturbation (i.e. high-irradiation for the former communities and low-irradiation for the latter ones). Overall, our results revealed that stochastic processes were of limited significance to explain these patterns. © 2019 Society for Applied Microbiology and John Wiley & Sons Ltd.

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