Show simple item record J. Hans C. en_US Terry V. en_US J. M. en_US A. en_US E. en_US A. E. en_US D. S. en_US S. E. en_US M. C. en_US C. H. en_US G. H. R. en_US G. R. en_US Gareth K. en_US Dylan en_US Sven E. en_US F. S. en_US U. en_US C. en_US J. A. en_US J. M. en_US B. en_US Rien en_US 2009-11-03T15:44:59Z 2009-11-03T15:44:59Z 2001-12 en_US
dc.identifier en_US
dc.identifier.citation Cornelissen , J H C , Callaghan , T V , Alatalo , J M , Michelsen , A , Graglia , E , Hartley , A E , Hik , D S , Hobbie , S E , Press , M C , Robinson , C H , Henry , G H R , Shaver , G R , Phoenix , G K , Gwynn-Jones , D , Jonasson , S E , Chapin III , F S , Molau , U , Neill , C , Lee , J A , Melillo , J M , Sveinbjörnsson , B & Aerts , R 2001 , ' Global change and arctic ecosystems: is lichen decline a function of increases in vascular plant biomass ' Journal of Ecology , vol 89 , no. 6 , pp. 984-994 . , 10.1111/j.1365-2745.2001.00625.x en_US
dc.identifier.other PURE: 127023 en_US
dc.identifier.other dspace: 2160/3415 en_US
dc.description.abstract Macrolichens are important for the functioning and biodiversity of cold northern ecosystems and their reindeer-based cultures and economies. 2We hypothesized that, in climatically milder parts of the Arctic, where ecosystems have relatively dense plant canopies, climate warming and/or increased nutrient availability leads to decline in macrolichen abundance as a function of increased abundance of vascular plants. In more open high-arctic or arctic-alpine plant communities such a relationship should be absent. To test this, we synthesized cross-continental arctic vegetation data from ecosystem manipulation experiments simulating mostly warming and increased nutrient availability, and compared these with similar data from natural environmental gradients. 3Regressions between abundance or biomass of macrolichens and vascular plants were consistently negative across the subarctic and mid-arctic experimental studies. Such a pattern did not emerge in the coldest high-arctic or arctic-alpine sites. The slopes of the negative regressions increased across 10 sites as the climate became milder (as indicated by a simple climatic index) or the vegetation denser (greater site above-ground biomass). 4Seven natural vegetation gradients in the lower-altitude sub- and mid-arctic zone confirmed the patterns seen in the experimental studies, showing consistent negative relationships between abundance of macrolichens and vascular plants. 5We conclude that the data supported the hypothesis. Macrolichens in climatically milder arctic ecosystems may decline if and where global changes cause vascular plants to increase in abundance. 6However, a refining of our findings is needed, for instance by integrating other abiotic and biotic effects such as reindeer grazing feedback on the balance between vascular plants and lichens. en_US
dc.format.extent 11 en_US
dc.relation.ispartof Journal of Ecology en_US
dc.subject arctic en_US
dc.subject ecosystem manipulation experiment en_US
dc.subject macrolichen en_US
dc.subject nutrient availability en_US
dc.subject vascular plant en_US
dc.subject warming en_US
dc.title Global change and arctic ecosystems: is lichen decline a function of increases in vascular plant biomass en_US
dc.contributor.pbl Aberystwyth University en_US
dc.contributor.pbl Institute of Biological, Environmental and Rural Sciences en_US

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