Plant Ecology

, Volume 154, Issue 1–2, pp 87–99 | Cite as

The effects of altered levels of UV-B radiation on an Antarctic grass and lichen

  • D. Lud
  • A.H.L. Huiskes
  • T.C.W. Moerdijk
  • J. Rozema
Article

Abstract

We report a long-term experiment on the photosynthetic response of natural vegetation of Deschampsia antarctica (Poaceae) and Turgidosculum complicatulum (Lichenes) to altered UV-B levels on Léonie Island, Antarctica.

UV-B above the vegetation was reduced by filter screens during two seasons. Half of the screens were transparent to UV-A and UV-B (ambient treatment) or absorbing UV-B and part of the UV-A (below-ambient treatment). Half of the wedge- shaped filters had side walls leading to an enhancement of the daily mean temperature in summer by 2–4 °C, simulating rising mean air temperature on the Antarctic Peninsula. The other half of the filters were without side walls resulting in close-to-ambient temperature underneath. Plots without filters served as controls.

UV-B supplementation of an extra 1.3 kJ UV-BBE was achieved using UV-mini-lamp systems during 15 days in the second season.

We found no evidence that altered incident UV-B levels and temperature had an effect on maximum photosystem II efficiency (Fv/Fm) and effective photosystem II efficiency (ΔF/Fm′) in both species. UV-B reduction did not influence contents of chlorophyll, carotenoids and methanol-soluble UV absorbing compounds in D. antarctica.

Flowering shoot length of D. antarctica was not affected by UV-B reduction. Temperature enhancement tended to result in longer inflorescence axes. Results of two austral summer seasons of UV- reduction in natural stands of D. antarctica and T. complicatulum suggest that current ambient levels of UV-B do not have a direct effect on the photosynthetic performance and pigment contents of these species. Cumulative effects on growth have not been recorded after two years but can not be excluded on a longer term.

Antarctica Carotenoids Deschampsia antarctica Photosynthesis Turgidosculum complicatulum UV-B radiation UV-B supplementation 

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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • D. Lud
    • 1
  • A.H.L. Huiskes
    • 1
  • T.C.W. Moerdijk
    • 1
  • J. Rozema
    • 2
  1. 1.Netherlands Institute of Ecology Centre for Estuarine and Coastal EcologyThe Netherlands
  2. 2.Department of Systems EcologyThe Netherlands

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