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Louisiana State University (2005)

Uncovering Bacterial Diversity on and below the Surface of a Hyper-Arid Environment, the Atacama Desert, Chile

Bagaley, Danielle Rene

Titre : Uncovering Bacterial Diversity on and below the Surface of a Hyper-Arid Environment, the Atacama Desert, Chile

Auteur : Bagaley, Danielle Rene

Université de soutenance : Louisiana State University Etats Unis

Grade : Master of Science (M.S.) 2005

Présentation

The Atacama Desert in Chile extends from latitudes 17º S to 28º S between longitudes 69º W and 71º W. It has been reported that surface soils in the hyper-arid region contain low numbers of culturable heterotrophic bacteria. These soils are considered Mars-like and offer an ideal setting to investigate the application of life detection systems. Thirty-three surface sites were sampled to examine further the extent of the hyper-arid region. We also excavated four soil pits, 40 cm to 90 cm in depth, to explore subsurface microbial communities. One pit was dug in a southern region of the desert compared to the location of the pits in the hyper-arid region. Samples were examined using culture-dependent techniques, including serial dilution plating methods on five media for the cultivation of heterotrophic bacteria.

Mots clés : Atacama Desert, hyper-arid, bacteria, diversity

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Page publiée le 21 mars 2010, mise à jour le 22 octobre 2016