The Arctic Oscillation predicts effects of climate change in two trophic levels in a high-arctic ecosystem

Ronny Aanes, Bernt-Erik Saether, Fiona M Smith, Elisabeth J Cooper, Philip A Wookey, Nils Are Øritsland

    Research output: Contribution to journalArticle

    96 Citations (Scopus)

    Abstract

    During recent decades there has been a change in the circulation of atmospheric pressure throughout the Northern Hemisphere. These variations are expressed in the recently described Arctic Oscillation (AO), which has shown an upward trend (associated with winter warming in the eastern Arctic) during the last three decades. We analysed a 12-year time series on growth of Cassiope tetragona (Lapland Cassiope) and a 21-year time series on abundance of a Svalbard reindeer population. High values of the AO index were associated with reduced plant growth and reindeer population growth rate. The North Atlantic Oscillation index was not able to explain a significant proportion of the variance in either plant growth or reindeer population fluctuations. Thus, the AO index may be a better predictor for ecosystem effects of climate change in certain high-arctic areas compared to the NAO index.

    Original languageEnglish
    Pages (from-to)445-453
    Number of pages9
    JournalEcology Letters
    Volume5
    Issue number3
    DOIs
    Publication statusPublished - May 2002

    Keywords

    • Arctic Oscillation
    • Cassiope tetragona
    • climate change
    • plant-herbivore interactions
    • Svalbard reindeer
    • CASSIOPE-TETRAGONA
    • POPULATION-DYNAMICS
    • DENSITY-DEPENDENCE
    • AIR-TEMPERATURE
    • PLANT PHENOLOGY
    • GREENHOUSE-GAS
    • RESPONSES
    • VEGETATION
    • REINDEER
    • TUNDRA

    Cite this