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Title

Prokaryotic community structure in algal photosynthetic biofilms from extreme acidic streams in Río Tinto (Huelva, Spain)

AuthorsSouza-Egipsy, Virginia ; González-Toril, Elena ; Zettler, Erik; Amaral-Zettler, Linda; Aguilera, Ángeles ; Amils, Ricardo
KeywordsAlgal biofilms
Prokaryotic community
Río Tinto
SEM-BSE
FISH
16S rRNA
Issue DateDec-2008
PublisherSociedad Española de Microbiología
Viguera Editores
CitationInternational Microbiology 11(4): 251-260 (2008)
AbstractFour algal photosynthetic biofilms were collected from the Río Tinto (SW Spain) at four localities: AG, Euglena and Pinnularia biofilms; ANG, Chlorella and Pinnularia biofilms; RI, Cyanidium and Dunaliella biofilms; and CEM, Cyanidium, Euglena and Pinnularia biofilms. Community composition and structure were studied by a polyphasic approach consisting of 16S rRNA analysis, scanning electron microscopy by back-scattered electron detection mode (SEM-BSE), and fluorescence in-situ hybridization (FISH). Acidophilic prokaryotes associated with algal photosynthetic biofilms included sequences related to the Alpha-, Beta-, and Gammaproteobacteria (phylum Proteobacteria) and to the phyla Nitrospira, Actinobacteria, Acidobacteria and Firmicutes. Sequences from the Archaea domain were also identified. No more than seven distinct lineages were detected in any biofilm, except for those from RI, which contained fewer groups of Bacteria. Prokaryotic communities of the thinnest algal photosynthetic biofilms (<100 μm) were more related to those in the water column, including Leptospirillum populations. In general, thick biofilms (>200 μm) generate microniches that could facilitate the development of less-adapted microorganisms (coming from the surrounding environment) to extreme conditions, thus resulting in a more diverse prokaryotic biofilm.
Description10 pages, 4 figures, 3 tables.-- PMID: 19204897 [PubMed].
Publisher version (URL)http://www.im.microbios.org/1104/1104contents.pdf
URIhttp://hdl.handle.net/10261/13025
DOI10.2436/20.1501.01.69
ISSN1139-6709
E-ISSN1618-1905
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(CBM) Artículos
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