The lost world of cuatro ciénegas basin, a relictual bacterial niche in a desert oasis

Valeria Souza, Alejandra Moreno-Letelier, Michael Travisano, Luis David Alcaraz, Gabriela Olmedo, Luis Enrique Eguiarte

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Barriers to microbial migrations can lead adaptive radiations and increased endemism. We propose that extreme unbalanced nutrient stoichiometry of essential nutrients can be a barrier to microbial immigration over geological timescales. At the oasis in the Cuatro Ciénegas Basin in Mexico, nutrient stoichiometric proportions are skewed given the low phosphorus availability in the ecosystem. We show that this endangered oasis can be a model for a lost world. The ancient niche of extreme unbalanced nutrient stoichiometry favoured survival of ancestral microorganisms. This extreme nutrient imbalance persisted due to environmental stability and low extinction rates, generating a diverse and unique bacterial community. Several endemic clades of Bacillus invaded the Cuatro Cienegas region in two geological times, the late Precambrian and the Jurassic. Other lineages of Bacillus, Clostridium and Bacteroidetes migrated into the basin in isolated events. Cuatro Ciénegas Basin conservation is vital to the understanding of early evolutionary and ecological processes.

Original languageEnglish (US)
Article numbere38278
JournaleLife
Volume7
DOIs
StatePublished - Nov 1 2018

Bibliographical note

Publisher Copyright:
© Souza et al.

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