English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/92165
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Ignimbrite as a substrate for endolithic life in the hyper-arid Atacama Desert: implications for the search for life on Mars

AutorWierzchos, Jacek ; Davila, Alfonso F.; Artieda, Octavio ; Cámara Gallego, Beatriz ; Ríos, Asunción de los ; Nealson, Kenneth H.; Valea, Sergio ; García-González, M.T. ; Ascaso, Carmen
Palabras claveGeophysics
Search for extraterrestrial life
Fecha de publicación2013
EditorAcademic Press
CitaciónIcarus 224(3): 334-346 (2013)
ResumenThe hyper-arid core of the Atacama Desert in Chile is considered the driest and most life-limited place on Earth, with few habitats capable of sustaining an active microbial ecosystem. As such, it is one of the best terrestrial analogues of the extreme arid conditions on Mars, and an ideal environment to explore survival and biological adaptation strategies as the environment becomes increasingly dry. Here we show that weakly welded rhyolitic ignimbrites in this desert are abundantly colonized by endolithic cyanobacteria and associated heterotrophic bacteria. We propose that the porous ignimbrite interior provides protection from damaging UV radiation and excessive levels of visible light. Rock porosity also favors cell hydration through water retention after scarce rainfall events, even when the surrounding environment remains stubbornly dry. This is the first known example of an endolithic microbial community colonizing ignimbrite rocks in an extremely dry environment. The existence of a habitat capable of supporting abundant phototrophic and heterotrophic communities in an environment that precludes most life forms suggests that, if similar deposits are found on Mars, these should be considered important targets in the search for life. Indeed, ignimbrite rocks have been tentatively identified in Gale Crater, the landing site of the Mars Science Laboratory (MSL) mission and could be directly analyzed by its rover Curiosity
Descripción13 páginas, 8 figuras y 3 tables
Versión del editorhttp://dx.doi.org/10.1016/j.icarus.2012.06.009
Identificadoresdoi: 10.1016/j.icarus.2012.06.009
issn: 0019-1035
Aparece en las colecciones: (MNCN) Artículos
(ICA) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
accesoRestringido.pdf15,38 kBAdobe PDFVista previa
Mostrar el registro completo

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.