Researcher, plant ecology, environmental change
I am interested in the role of vegetation as ecosystem structure and influence of vegetation changes on ecosystem functions. Environmental change impacts vegetation, the change of which alters environment, and the role of ecosystem in the biosphere can be shifted. My main esearch focus is in northern mires - peat accumulating wetlands.
Faculty of Science and Forestry, Department of Environmental and Biological Sciences
+358 50 442 3987
Field courses in botany and ecology, advanced courses in applied statistics and peatland ecology, lectures in various topics of ecology
I participate in several working groups of conservation biology and natural resources use in Finland (Finnish Environmental Institute, Ministry of Environment) and internationally (IUCN)
Research groups and research projects
SHIFTMIRE – Academy of Finland 2017-2021
Shiftmire project explores changes of northern mires during past decades and as projected to near future. We focus on aapa mires (northern patterned fen complexes) but also study palsa mires and more generally the current state of peatlands in Finland. Aapa mires are northern fens with their southern distribution limit at ca. 1100 growing degree C temperature sum, the isocline of which lies about at Joensuu campus. This limit was delineated in 1960’s, however, and since then marked warming has taken place. We explore in a multidisciplinary approach if aapa mires are changing with the warming climate. Our proxies include time series of aerial images (from 1940’s) and satellite data (Landsat), hydrological and climate modeling, peat stratigraphies of macrofossils and hyperspectra, and of course vegetation mapping with repeated data.
LETTO-PUTTE – Ministry of Environment 2021-2022
In this project of the PUTTE-program (poorly known habitats and species) of Ministry of Environment we study vegetation types and species of rich fens (’letto’ in Finnish). These habitats are among the most threatened and have special biodiversity values. We collect all possible vegetation plot data that exists from Finnish rich fens and amend it in a field work campaign. The data base will enable revision of vegetation classification of rich fens and presentation of their distribution. We also produce information of rich-fen species occurrences with specific focus on poorly known molluscs and hepatics.
New project (2021) is in start-up phase on a cultivation method of peat mosses based on experience with restoration of forestry-drained peatlands. This method could at least partly replace exploitative peat mining and moss harvesting in a restorative approach of paludiculture. Interested parties are encouraged to take contact!
PROJECTS - UEF
Hájek, Michal; Jiménez-Alfaro, Borja; Hájek, Ondrej; Brancaleoni, Lisa; Cantonati, Marco; Carbognani, Michele; Dedic, Anita; Díte, Daniel; Gerdol, Renato; Hájková, Petra; Horsáková, Veronika; Jansen, Florian; Kamberovic, Jasmina; Kapfer, Jutta; Kolari, Tiina Hilkka Maria; Lamentowicz, Mariusz; Lazarevic, Predrag; Mašic, Ermin; Moeslund, Jesper; Erenskjold Pérez-Haase, Aaron et al. [incl. Tahvanain. 2021. A European map of groundwater pH and calcium Earth system science data 13 3: 1089-1105. 2021
Kolari, Tiina H M; Korpelainen, Pasi; Kumpula, Timo; Tahvanainen, Teemu. 2021. Accelerated vegetation succession but no hydrological change in a boreal fen during 20 years of recent climate change Ecology and evolution 11 12: 7602-7621. 2021
Granlund, L; Keinänen, M; Tahvanainen, T. 2020. Identification of peat type and humification by laboratory VNIR/SWIR hyperspectral imaging of peat profiles with focus on fen-bog transition in aapa mires Plant and soil 2021; 460 1-2: 667-686. 2020
Kolari, Tiina; Kumpula, Timo; Verdonen, Mariana; Forbes, Bruce C; Tahvanainen, Teemu. 2019. Reindeer grazing controls willows but has only minor effects on plant communities in Fennoscandian oroarctic mires Arctic antarctic and alpine research 51 1: 506-520. 2019
Laine, AM; Frolking, S; Tahvanainen, T; Tolvanen, A; Tuittila, E-S. 2019. Spring-season flooding is a primary control of vegetation succession trajectories in primary mires Mires and peat 24: 20. 2019
Nykänen, Hannu; Rissanen, Antti J; Turunen, Jukka; Tahvanainen, Teemu; Simola, Heikki. 2019. Carbon storage change and δ13C transitions of peat columns in a partially forestry-drained boreal bog Plant and soil 2020; 447: 365-378. 2019
Sallinen, A; Tuominen, S; Kumpula, T; Tahvanainen, T. 2019. Undrained peatland areas disturbed by surrounding drainage: a large scale GIS analysis in Finland with a special focus on aapa mires Mires and peat 24: 38. 2019
Application of UAS in the analysis of the spatial distribution of active layer thickness in Palsa mounds. Verdonen, Mariana; Tarolli, Paolo; Korpelainen, Pasi; Kolari, Tiina; Tahvanainen, Teemu; Kumpula, Timo / Geophysical Research Abstracts, Vol. 21. 2019. 2019
Multidisciplinary assessment of European aapa mire ecosystem changes. Tahvanainen, T; Bland, L; Granlund, L; Gunnarsson, U; Keith, D; Kolari, T; Kumpula, T; Kuznetsov, O; Marttila, H; Murray, N; Sallinen, A; Tuominen, S / ECCB 2018. 2018. 2018
Suot. Kaakinen, E; Kokko, A; Aapala, Kaisu; Autio, O; Eurola, S; Hotanen, JP; Kondelin, H; Lindholm, T; Nousiainen, H; Rehell, S; Ruuhijärvi, R; Sallantaus, T; Salminen, P; Tahvanainen, T; Tuominen, S; Turunen, J; Vasander, H; Virtanen, K / Suomen luontotyyppien uhanalaisuus 2018. Luontotyyppien punainen kirja - Osa 1: Tulokset ja arvioinnin perusteet. 2018. 2018