The water of the Cuatro Ciénegas ponds is an ultra-oligotrophic system (this means that they have a very low concentration of nutrients), which acts as a natural barrier, as only species that have adapted over millions of years to the site survive.
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Details
Title: Cuatro Ciénegas Valley a window to the past
Creator: Nicolás Sánchez-Mejorada Girault
Location Created: Cuatro Ciénegas de Carranza, Coahuila.