Otero S, Núñez-Olivera E, Martínez-Abaigar J, Tomás R, Huttunen S. Retrospective bioindication of stratospheric ozone and ultraviolet radiation using hydroxycinnamic acid derivatives of herbarium samples of an aquatic liverwort.
ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2009;
157:2335-2344. [PMID:
19361900 DOI:
10.1016/j.envpol.2009.03.025]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2008] [Revised: 03/11/2009] [Accepted: 03/19/2009] [Indexed: 05/27/2023]
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.
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