Retrospective bioindication of stratospheric ozone and ultraviolet radiation using hydroxycinnamic acid derivatives of herbarium samples of an aquatic liverwort
- Otero, S. 2
- Núñez-Olivera, E. 2
- Martínez-Abaigar, J. 2
- Tomás, R. 2
- Huttunen, S. 1
-
1
University of Oulu
info
-
2
Universidad de La Rioja
info
ISSN: 0269-7491
Year of publication: 2009
Volume: 157
Issue: 8
Pages: 2335-2344
Type: Article
beta Ver similares en nube de resultadosMore publications in: Environmental Pollution
Related Projects
Abstract
We analyzed bulk UV absorbance of methanolic extracts and levels of five UV-absorbing compounds (hydroxycinnamic acid derivatives) in 135 herbarium samples of the liverwort Jungermannia exsertifolia subsp. cordifolia from northern Europe. Samples had been collected in 1850-2006 (96% in June-August). Both UV absorbance and compound levels were correlated positively with collection year. p-Coumaroylmalic acid (C1) was the only compound showing a significant (and negative) correlation with stratospheric ozone and UV irradiance in the period that real data of these variables existed. Stratospheric ozone reconstruction (1850-2006) based on C1 showed higher values in June than in July and August, which coincides with the normal monthly variation of ozone. Combining all the data, there was no long-term temporal trend from 1850 to 2006. Reconstructed UV showed higher values in June-July than in August, but again no temporal trend was detected in 1918-2006 using the joint data. This agrees with previous UV reconstructions. © 2009 Elsevier Ltd. All rights reserved.