Plant Ecology

, Volume 202, Issue 1, pp 79–89

Short-term signals of climate change along an altitudinal gradient in the South Alps

Authors

    • Institute of BotanyUniversity of Innsbruck
  • Thomas Kiebacher
    • Institute of BotanyUniversity of Innsbruck
  • Martin Mallaun
    • Institute of BotanyUniversity of Innsbruck
  • Peter Unterluggauer
    • Institute of BotanyUniversity of Innsbruck
Article

DOI: 10.1007/s11258-008-9556-1

Cite this article as:
Erschbamer, B., Kiebacher, T., Mallaun, M. et al. Plant Ecol (2009) 202: 79. doi:10.1007/s11258-008-9556-1

Abstract

Short-term changes in plant species number, frequency and composition were studied along an altitudinal gradient crossing four summits from the treeline ecotone to the subnival zone in the South Alps (Dolomites, Italy). Large-scale (summit areas) and small-scale patterns (16 plots of 1 m²/summit) were monitored. After 5 years, a re-visitation of the summit areas revealed a considerable increase of species richness at the upper alpine and subnival zone (10% and 9%, respectively) and relatively modest increases at the lower alpine zone and the treeline ecotone (3% and 1%, respectively). At the small scale, the results were partly different, with species richness decreasing at the lower summits and increasing at the higher summits. The changes can most likely be attributed to climate warming effects and to competitive interactions. The main newcomers at the lower three summits were species from the treeline and the lower altitudinal zones. Only at the highest summit, the newcomers came from the alpine species pool. At the treeline ecotone, the abundance of Pinus cembra, of dwarf shrubs and clonal graminoid species increased. Here, displacements of alpine species may be predicted for the near future. At the higher summits, expansions of the established alpine species and further invasions of species from lower altitudes are forecasted.

Keywords

AlpineEndemic speciesFrequencyGLORIAMonitoringRe-visitationSubnivalTreeline ecotone

Copyright information

© Springer Science+Business Media B.V. 2008