An endangered oasis of aquatic microbial biodiversity in the Chihuahuan desert.

Proceedings of the National Academy of Sciences of the United States of America
Valeria SouzaJames J Elser

Abstract

The Cuatro Cienegas basin in the Chihuahuan desert is a system of springs, streams, and pools. These ecosystems support >70 endemic species and abundant living stromatolites and other microbial communities, representing a desert oasis of high biodiversity. Here, we combine data from molecular microbiology and geology to document the microbial biodiversity of this unique environment. Ten water samples from locations within the Cuatro Cienegas basin and two neighboring valleys as well as three samples of wet sediments were analyzed. The phylogeny of prokaryotic populations in the samples was determined by characterizing cultured organisms and by PCR amplification and sequencing of 16S rRNA genes from total community DNA. The composition of microbial communities was also assessed by determining profiles of terminal restriction site polymorphisms of 16S rRNA genes in total community DNA. There were 250 different phylotypes among the 350 cultivated strains. Ninety-eight partial 16S rRNA gene sequences were obtained and classified. The clones represented 38 unique phylotypes from ten major lineages of Bacteria and one of Archaea. Unexpectedly, 50% of the phylotypes were most closely related to marine taxa, even though these environme...Continue Reading

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Citations

Nov 26, 2010·Microbial Ecology·Albert Barberán, Emilio O Casamayor
Jun 4, 2008·Nature Reviews. Microbiology·Valeria SouzaJames J Elser
Apr 15, 2008·Proceedings of the National Academy of Sciences of the United States of America·Luis David AlcarazLuis Herrera-Estrella
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Sep 8, 2016·PeerJ·Natali Hernández-BecerraFelipe García-Oliva

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