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Measurement of Age and Growth Rate in the Crustose Saxicolous Lichen Caloplaca Trachyphylla Using 14C Accelerator Mass Spectrometry

Published online by Cambridge University Press:  28 March 2007

B. M. Clark ,
N. F. Mangelson ,
L. L. St. Clair ,
L. B. Rees ,
G. S. Bench  and
J. R. Southon¶
B. M. Clark
Affiliation:
Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
N. F. Mangelson
Affiliation:
Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
L. L. St. Clair
Affiliation:
Department of Botany and Range Science, Brigham Young University, Provo, UT 84602, USA
L. B. Rees
Affiliation:
Department of Physics and Astronomy, Brigham Young University, Provo, UT 84602, USA
G. S. Bench
Affiliation:
Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
J. R. Southon¶
Affiliation:
Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
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Abstract

Sections of the crustose saxicolous lichen, Caloplaca trachyphylla, were dated using 14C accelerator mass spectrometry (AMS). The data show a stron linear dependence of radial position on time (r=0.993), suggesting a constant radial growth rate. This specimen had averaged a marginal growth rate of 1.48 mm/year. Extrapolation of the growth curve yields a thallus age of 20 years. These data demonstrate the feasibility of using AMS technology to precisely date lichen tissues and determine growth rates of lichen thalli.

Type
Research Article
Information
The Lichenologist , Volume 32 , Issue 4 , July 2000 , pp. 399 - 403
Copyright
Copyright © British Lichen Society 2000

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