The lost world of Cuatro Cienegas Basin, a relictual bacterial niche in a desert oasis
Por:
Souza V., Moreno-Letelier A., Travisano M., Alcaraz L.D., Olmedo G., Eguiarte L.E.
Publicada:
20 nov 2018
Resumen:
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
Cienegas 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 Cienegas Basin conservation is vital to the understanding
of early evolutionary and ecological processes.
Filiaciones:
Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Coyoacán, Mexico
Jardín Botánico, Instituto de Biología Universidad Nacional Autónoma de México, Coyoacán, Mexico
Department of Ecology, Evolution and Behavior, University of Minnesota, Saint Paul, United States
Laboratorio Nacional de la Ciencias de la Sostenibilidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Coyoacán, Mexico
Laboratorio de Biología Molecular y Ecología Microbiana, Departamento de Ingeniería Genética, Unidad Irapuato Centro de Investigación y Estudios AvanzadosGuanajuato, Mexico
|