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Título

Ignimbrite textural properties as determinants of endolithic colonization patterns from hyper-arid Atacama Desert

AutorCámara Gallego, Beatriz ; Suzuki, Shino; Nealson, Kenneth H.; Ascaso, Carmen ; Wierzchos, Jacek ; Ríos, Asunción de los ; Artieda, Octavio
Palabras claveChroococcidiopsis sp.
Endoliths
Ignimbrite
Rock porosity
Volcanic rock
Atacama Desert
Fecha de publicación15-dic-2014
EditorSociedad Española de Microbiología
Viguera Editores
Springer
CitaciónInternational Microbiology 17: 235-247 (2014)
ResumenThis study explores the photosynthetic microbial colonization of rhyolitic ignimbrites in Lomas de Tilocalar, a hyper-arid region of the Atacama Desert, Chile. Colonization appeared in the form of a green layer a few millimeters beneath the ignimbrite surface. Some ignimbrite rocks revealed two distinct micromorphological areas of identical mineralogical and chemical composition but different textural properties. According to texture, colonization patterns varied in terms of the extension and depth of colonization. The diversity of photosynthetic microorganisms was assessed by denaturing gradient gel electrophoresis (DGGE) of the 23S rRNA gene and by generating clone libraries of the 16S rRNA gene. We observed a low diversity of photosynthetic microorganisms colonizing the ignimbrite microhabitat. Most rRNA gene sequences recovered greatly resembled those of Chroococcidiopsis hypolith clones from arid deserts. These results point to highly restrictive conditions of the hyper-arid Atacama Desert conditioning the diversity of cyanobacteria, and suggest that microbial colonization and composition patterns might be determined by the microscale physicochemical properties of the ignimbrite rocks.
DescripciónReceived 23 September 2014
Versión del editorhttp://dx.doi.org/10.2436/20.1501.01.226
URIhttp://hdl.handle.net/10261/121765
DOI10.2436/20.1501.01.226
ISSN1139-6709
E-ISSN1618-1095
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