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Temporal variation in usnic acid concentration in Usnea aurantiaco-atra in Antarctica
Entry ID: 110-88_01

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Abstract: In Usnea aurantiaco-atra, growing in the Antarctica, a monthly variation in the
usnic acid content, in individual thalli, was studied by means of scanning
densitometry (HPTLC). The higher accumulation rates were quantified from
January to May; there was a significant decrease in the concentrations from
June to December, during the three years of study. In spite of the thalli were
taken from a same location, variations could be observed in the usnic acid
concentration in the individuals from within each monthly sample.
Geographic Coverage
Spatial coordinates   
  N: -62.28   S: -62.28   E: -57.37   W: -57.37

Data Set Citation
Dataset Originator/Creator: Wanda Quilhot et al
Dataset Title: Lichen secondary products and their importance in environmental studies
Dataset Release Date: 1998-05-01
Dataset Release Place: Sao Paulo, Brazil
Dataset Publisher: Seaward (Eds)
Version: 1
Issue Identification: Lichenology in Latin America: history, current knowledge and applications
Data Presentation Form: Tables and graphics
Temporal Coverage
Start Date: 1987-02-05
Stop Date: 1989-12-05
ISO Topic Category
Quality Mats of Usnea aurantiaco-atra, growing in an open space, were collected monthly
-when possible- in the area of Baliza Poisson, Arturo Prat Base, and Greenwich
Island from February 1987 to December 1989. The lichenic material was dried at
room temperature and was packed until it was taken to the laboratory. Fifteen
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Access Constraints Public information
Use Constraints Public information
Data Set Progress
Data Center
Centro Nacional de Datos Antarticos, Instituto Antartico Chileno, Chile Supplemental Info
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Data Center Personnel
Phone: ++56 /61/ 298135
Fax: ++56 /61/ 298149
Email: rjana at
Contact Address:
Plaza Munoz Gamero 1055
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City: Punta Arenas
Country: Chile
Email: djorquer at
Contact Address:
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City: Santiago
Country: Chile
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Quilhot W., W. Pena; E. Flores; M. E. Hidalgo; E. Fernandez and G. Lllelighton (1991), Variacion temporal en la concentracion de acido usnico en Usnea aurantiaco-atra (Jaq.), Bory. Ser. Cient. INACH 41, 99-106
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Creation and Review Dates
DIF Creation Date: 2005-03-11
Last DIF Revision Date: 2016-11-18
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