Cyanobacterial biocrust diversity in Mediterranean ecosystems along a latitudinal and climatic gradient

M. Ángeles Muñoz-Martín, Itzel Becerra-Absalón, Elvira Perona, Lara Fernández-Valbuena, Ferran Garcia-Pichel, Pilar Mateo

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Cyanobacteria are a key biotic component as primary producers in biocrusts, topsoil communities that have important roles in the functioning of drylands. Yet, major knowledge gaps exist regarding the composition of biocrust cyanobacterial diversity and distribution in Mediterranean ecosystems. We describe cyanobacterial diversity in Mediterranean semiarid soil crusts along an aridity gradient by using next-generation sequencing and bioinformatics analyses, and detect clear shifts along it in cyanobacterial dominance. Statistical analyses show that temperature and precipitation were major parameters determining cyanobacterial composition, suggesting the presence of differentiated climatic niches for distinct cyanobacteria. The responses to temperature of a set of cultivated, pedigreed strains representative of the field populations lend direct support to that contention, with psychrotolerant vs thermotolerant physiology being strain dependent, and consistent with their dominance along the natural gradient. Our results suggest a possible replacement, as global warming proceeds, of cool-adapted by warm-adapted nitrogen-fixing cyanobacteria (such as Scytonema) and a switch in the dominance of Microcoleus vaginatus by thermotolerant, novel phylotypes of bundle-forming cyanobacteria. These differential sensitivities of cyanobacteria to rising temperatures and decreasing precipitation, their ubiquity, and their low generation time point to their potential as bioindicators of global change.

Original languageEnglish (US)
Pages (from-to)123-141
Number of pages19
JournalNew Phytologist
Volume221
Issue number1
DOIs
StatePublished - Jan 2019

Keywords

  • Illumina sequencing
  • global change
  • indicator
  • key topsoil microorganisms
  • precipitation
  • psychrotolerant cyanobacteria
  • temperature
  • thermotolerant cyanobacteria

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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