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Updated: May 20, 2026
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Soil Lysimeter Excavation for Coupled Hydrological, Geochemical, and Microbiological Investigations
Published on: September 11, 2016
Microbialite genetic diversity and composition relate to environmental variables.
Carla M Centeno1, Pierre Legendre, Yislem Beltrán
1Instituto de Ecología, Universidad Nacional Autónoma de México, Mexico City, Mexico.
FEMS Microbiology Ecology
|July 11, 2012
Summary
Microbialites host diverse microbial communities, varying geographically and with environmental factors like pH. This study analyzed their genetic makeup using 16S rRNA gene sequencing.
Area of Science:
- Microbiology
- Geochemistry
- Evolutionary Biology
Background:
- Microbialites are ancient structures providing evidence of early life on Earth.
- Extant microbialites are recognized for their ecological roles in element cycling and carbonate precipitation.
- The genetic diversity of extant microbialites remains underexplored.
Purpose of the Study:
- To analyze the microbial genetic diversity of Mexican microbialites across diverse environments.
- To identify environmental factors influencing microbialite community composition.
Main Methods:
- Pyrosequencing of hypervariable regions of the 16S rRNA gene.
- Analysis of microbial communities in desert ponds, coastal lagoons, and a crater lake in Mexico.
Main Results:
- Microbialite communities exhibited high diversity (Shannon index H' = 6-7).
- Significant geographic variation and environmental effects (pH, conductivity) explained 33% of genetic variation.
- Major bacterial and archaeal phyla proportions were consistent across all studied microbialites.
Conclusions:
- Mexican microbialites harbor genetically diverse microbial communities.
- Environmental parameters like pH and conductivity are key drivers of microbialite community structure.
- Despite environmental influences, core microbial phyla are conserved across different microbialite ecosystems.
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