Quantification of UV-B flux through time using UV-B-absorbing compounds contained in fossil Pinus sporopollenin
Article first published online: 2 AUG 2011
© 2011 The Authors. New Phytologist © 2011 New Phytologist Trust
Volume 192, Issue 2, pages 553–560, October 2011
How to Cite
Willis, K. J., Feurdean, A., Birks, H. J. B., Bjune, A. E., Breman, E., Broekman, R., Grytnes, J.-A., New, M., Singarayer, J. S. and Rozema, J. (2011), Quantification of UV-B flux through time using UV-B-absorbing compounds contained in fossil Pinus sporopollenin. New Phytologist, 192: 553–560. doi: 10.1111/j.1469-8137.2011.03815.x
- Issue published online: 27 SEP 2011
- Article first published online: 2 AUG 2011
- Received: 1 May 2011, Accepted: 31 May 2011
- fossil pollen;
- p-coumaric acid (pCA);
- Pinus spp.;
- ultraviolet-absorbing compounds;
- UV-B radiation
- •UV-B radiation currently represents c. 1.5% of incoming solar radiation. However, significant changes are known to have occurred in the amount of incoming radiation both on recent and on geological timescales. Until now it has not been possible to reconstruct a detailed measure of UV-B radiation beyond c. 150 yr ago.
- •Here, we studied the suitability of fossil Pinus spp. pollen to record variations in UV-B flux through time. In view of the large size of the grain and its long fossil history, we hypothesized that this grain could provide a good proxy for recording past variations in UV-B flux.
- •Two key objectives were addressed: to determine whether there was, similar to other studied species, a clear relationship between UV-B-absorbing compounds in the sporopollenin of extant pollen and the magnitude of UV-B radiation to which it had been exposed; and to determine whether these compounds could be extracted from a small enough sample size of fossil pollen to make reconstruction of a continuous record through time a realistic prospect.
- •Preliminary results indicate the excellent potential of this species for providing a quantitative record of UV-B through time. Using this technique, we present the first record of UV-B flux during the last 9500 yr from a site near Bergen, Norway.