Document Detail

Yeast diversity in the acidic Rio Agrio-Lake Caviahue volcanic environment (Patagonia, Argentina).
MedLine Citation:
PMID:  18537834     Owner:  NLM     Status:  MEDLINE    
The Rio Agrio and Lake Caviahue system (RAC), in Northwestern Patagonia, is a natural acidic environment. The aims of this study were to characterize the yeast community and to provide the first ecological assessment of yeast diversity of this extreme aquatic environment. Yeast occurrence and diversity were studied at seven sites where the water pH varied between 1.8 and 6.7. Yeast CFU counts in the river ranged from 30 to 1200 CFU L(-1), but in the Lake the values were lower (30-60 CFU L(-1)). A total of 25 different yeast species were found, 11 of which belonged to undescribed taxa. Among these was an unusual strongly acidophilic Cryptococcus species. The RAC yeast community resembles that of acidic aquatic environments resulting from anthropic activities such as the São Domingos mines in Portugal and the Rio Tinto in Spain, respectively. The isolated yeast species were organized into different grades of adaptation to the RAC aquatic system. Based on the proposed grades, Rhodotorula mucilaginosa, Rhodosporidium toruloides and two novel Cryptococcus species were the most adapted species. These Cryptococcus species are apparently specialists of acidic aquatic environments, and might bear physiological features that possibly account for their ability to thrive in such extreme environments.
Gabriel Russo; Diego Libkind; José P Sampaio; Maria R van Broock
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-06-04
Journal Detail:
Title:  FEMS microbiology ecology     Volume:  65     ISSN:  0168-6496     ISO Abbreviation:  FEMS Microbiol. Ecol.     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-09-17     Completed Date:  2008-10-06     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8901229     Medline TA:  FEMS Microbiol Ecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  415-24     Citation Subset:  IM    
Laboratorio de Microbiología Aplicada y Biotecnología, Centro Regional Universitario Bariloche, Universidad Nacional del Comahue, Bariloche, Argentina.
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MeSH Terms
Adaptation, Biological*
Colony Count, Microbial
Cryptococcus / classification,  growth & development,  isolation & purification
DNA, Fungal / genetics
Fresh Water / microbiology
Hydrogen-Ion Concentration
Microbial Viability
Rhodotorula / classification,  growth & development,  isolation & purification
Rivers / microbiology
Volcanic Eruptions
Water Microbiology*
Yeasts / classification*,  growth & development,  isolation & purification
Reg. No./Substance:
0/DNA, Fungal

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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