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1 Ph.D. Student Dept. of Ecology and Environmental Science Phone: (0) Physiology Building, 4 th floor Fax: (0) Umeå University SE Umeå lena.wiedermann@emg.umu.se Currently visiting researcher Professor Monica G. Turner Lab Department of Zoology, 436 Birge Hall Phone: University of Wisconsin, 430 Lincoln Dr. Madison, WI, 53706, USA Alpine and Boreal Vegetation Nitrogen and climate change impacts on vegetation Plant-parasite interactions with focus on parasitic fungi Nutrient impacts on peatlands Sphagnum responses to enhanced nitrogen supply My current research is focused on how enhanced nutrient supply and climatic change (manipulation of snow conditions and temperature) drives plant parasite interactions and ecosystem change. I am working in an area with very low N background deposition (~2kg ha -1 yr -1 ) which enables us to study initial responses of strictly N limited ecosystems. My main study areas are a boreal mire, Degerö Stormyr (64º11 N, 19º33 E; 270 m a. s. l.) and a very nutrient poor pine heath, likewise being situated in the area. Due to strong nitrogen limitation both systems show a considerable time lag in response. Yet, after 8 years of N addition the experiment at the boreal mire shows striking changes in plant dominance. Especially the close Sphagnum carpet had collapsed. In order to achieve a better understanding of driving factors of ecosystem change following enhanced N supply I have studied the interactions between parasitic fungi infecting the dwarf shrubs. My ongoing work addresses physiological responses of the disappearing Sphagnum. The results from combined studies, a transect study along a nitrogen deposition gradient in and experimental data from Degerö Stormyr are now used to clarify causes of the observed Sphagnum decline associated with enhanced nitrogen deposition. Supervisors: Prof. Lars Ericson and Prof. Annika Nordin

2 August 1999 August 2000 ERASMUS-Exchange student at the university of Umeå, MSc 2001 Biology at the University of Vienna Specialization in Ecology with main focus on vegetation Ecology (Plant Sociology) M.Sc. thesis: Characterization of the vegetation of the inundation meadows next to the river Danube, eastern of Vienna, with additional investigations of the ecological position of various typical vascular plants in the region under scientific guidance of: Prof. Harald Niklfeld September 2003 present July & August 2003 July & August 2002 Ph.D. Student Dept. of Ecology and Environmental Science, Umeå University, Research assistant Recent immigrants or ancient witnesses of recurrent climate change? The fate of rare arctic plants in the Alps revisited. by Dr. Peter Schönswetter. Sampling of plant material in Italy, France, Switzerland and Austria. Research assistance at the Mountain Research Station Niwot Ridge, Colorado (Prof. Willam D. Bowman & Dr. Katharine Nash Suding) Mid August Mid September 2001 Research assistant at DART-Project (Prof. Lauri Oksanen) in Northern Scandinavia Mid June Mid August 2001 August 2000 June 2000 Mai & September 1998 Research assistant in Arctic Siberia (Prof. Andreas Richter) investigating nutrient cycling and ecotone reactions to global warming Floristic mapping of alpine regions in the Alpine parts of Italy Research assistant at DART-Project (Prof. Lauri Oksanen) (dynamic response of the forest-tundra ecotone to environmental change) in Northern Scandinavia Floristic mapping of alpine regions

3 2006 Responsible for program and organization of one week excursion on advanced level course in Conservation Biology Dept. of Ecology and Environmental Science, Umeå 2005 Responsible for program and organization of one week excursion on advanced level course in Conservation Biology Dept. of Ecology and Environmental Science, Umeå Graduate Teaching Ecology I Dept. of Ecology and Environmental Science, Umeå 2004 Graduate Teaching on advanced level course in Conservation Biology Dept. of Ecology and Environmental Science, Umeå Graduate Teaching Winter-Ecology; Botany (one week excursion) Dept. of Ecology and Environmental Science, Umeå Graduate Teaching Systematik and Species Identification - Protista, Fungi & Plantae Dept. of Ecology and Environmental Science, Umeå 2006 Research money for own project Responses of Sphagnum species to elevated nitrogen supply in their uptake properties for inorganic and organic nitrogen sources. from Stiftelsen Anna och Gunnar Vidfelts fond för biologisk forskning; SeK ($17 000) Conference/course, travel, field work equipment, from several stipends from Swedish agencies, totaling SeK ($15 000). Wiedermann M. M., A. Nordin, U. Gunnarsson, M. B. Nilsson, L. Ericson Global change shifts vegetation and plant-parasite interactions in a boreal mire. Ecology 88: Bowman, W. D., J. R. Gartner, K. Holland, and M. Wiedermann Nitrogen critical loads for alpine vegetation and terrestrial ecosystem response: Are we there yet? Ecological Applications 16: Schönswetter, P., Schneeweiss, G. M., Wittmann, H., Tribsch, A. & Wiedermann, M Equisetum arvense subsp. boreale auct. eur. (Equisetaceae) ein bisher übersehenes, arktisch-alpines Florenelement der Alpen. Neilreichia 1:

4 Wiedermann M. M., A. Nordin, U. Gunnarsson, M. B. Nilsson, L. Ericson. Sphagnum response to enhanced N - A transect study and experimental data from. oral presentation at Symposium on Carbon in Peatlands, April , Wageningen, Netherlands. Wiedermann M. M., A. Nordin, U. Gunnarsson, M. B. Nilsson, L. Ericson. Raised temperature and enhanced nitrogen availability leads to Sphagnum decline: causes and consequences. oral presentation at 13th Conference of the International Boreal Forest Research Association (IBFRA) August , Umeå,. Wiedermann M. M., A. Nordin, M. B. Nilsson, U. Gunnarsson, L. Ericson. Global change shifts vegetation and plant parasitic interaction on a boreal mire. poster presententation at the XVII International Botanical Congress (IBC). July , Vienna, Austria. Wiedermann M. M., A. Nordin, M. B. Nilsson, U. Gunnarsson, L. Ericson. Global change and trophic interaction on a boreal mire. oral presentation at Oikos Symposium February , Umeå,. Wiedermann M. M., A. Nordin, M. B. Nilsson, U. Gunnarsson, L. Ericson. Enhanced nitrogen supply leads to changed plant chemistry and vegetation shift in boreal mire. oral presentation at Symposium Reduced Nitrogen in Ecology and the Environment October , Obergurgl, Austria.

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