Abstract:
:Antarctic endolithic microecosystems harbour distinct biofilms. The lithic substrate and the microorganisms comprising these films are intimately linked, leading to complex mineral-microbe interactions. Hence, the microhabitats and microenvironments of these microecosystems are not only determined by the physicochemical features of the lithic substrate, but are also conditioned by the biological components of these biofilms. The Antarctic biofilms analysed in this study are characterized by the presence of extracellular polymer substances and acid microenvironments in the proximity of the cells; cyanobacteria appearing as key components. On ultrastructural analysis, these endolithic cyanobacteria showed differences in sheath organization, probably related to their spatial position in the lithic substrate. It is proposed that in this type of ecosystem, biofilm structure could favour the formation of microsites with specific physicochemical conditions appropriate for the survival of microbial communities in this extreme environment.
journal_name
Environ Microbioljournal_title
Environmental microbiologyauthors
de los Ríos A,Wierzchos J,Sancho LG,Ascaso Cdoi
10.1046/j.1462-2920.2003.00417.xkeywords:
subject
Has Abstractpub_date
2003-04-01 00:00:00pages
231-7issue
4eissn
1462-2912issn
1462-2920pii
417journal_volume
5pub_type
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