Members of PECC group

Plant Ecophysiology and Climate Change Group - PECC

Helena Åström, group leader


Dr Helena Åström is working in the field of winter ecology focusing on the overwintering of herbaceous species, with emphasis on physiological and morphological traits. Ongoing research projects include photosynthesis and morphological adaptations of wintergreen plants, invasive species and warming winters, and snow ecology in relation to the overwintering of plants. She is also studying the population ecology of the field garlic (Allium oleraceum), and the effect of winter conditions on phenological events of plants of different origin.

As of October 2016, she is leading the PECC group.

For more information on the field garlic project please see the Allium project homepage

Publications in Tuhat research database

Timo Saarinen


Dr Timo Saarinen has research experience in plant ecophysiological studies. Previously, he has studied the effects of climate change on mires and other wetland ecosystems. His current research interest is in the snow ecology of northern plants, and the effects of warming winters on invasive plant species.


Publications in Tuhat research database

Sonja Still


Former group members

Professor Heikki Hänninen established the PECC group in 2001. His main research interest is the seasonality and climatic adaptation of northern plants. He is combining experimental ecophysiology with dynamic modelling. As of October 2016, he works as a professor in plant ecology at the Zhejiang A & F University, China.

Dr Robin Lundell worked as a PhD student and as a postdoc in the group in 2001-2016. Using both observational, experimental, and modelling appoaches, he is studied the dormancy requirement of plants representing different functional groups. Currently, we works at the Finnisch Matriculation Examination Board.

Dr Sirpa Rasmus worked as a postdoc in the group in 2007-2010. She has her background in geophysics, and is studying snow pack structure and characteristics. Currently, she is working at the Deparment of Biological and Environmental Sciences, University of Jyväskylä, Finland.

Friederike Gehrmann has obtained a B.Sc. in Biochemistry in London, UK, and then moved to Helsinki for a Master’s degree in Plant and Forest Biotechnology followed by PhD studies in Plant Biology funded by Doctoral Programme in Plant Science (DPPS). In her PhD she studied how plant phenology and plant stress are affected by the timing of snowmelt in natural and experimental systems in Kilpisjärvi (northern Finland) and Svalbard. She defended her doctoral thesis titled Effects of microclimatic variation of snowmelt and temperature on subarctic-alpine and arctic plants in May 2019.

MSc students

Former MSc students

Sarianna Alho

Ann-Sofie Åstrand

Pirjo Auvinen

Jalmar Donner

Johanna Hannuksela

Sannimari Käärmelahti

Che Liu

Zhenzhen Liu

Elisa Metsovuori

Johanna Nymark

Elli Palmgren

Linda Peltola

Robin Sjöblom

Sonja Still

Kristiina Tolvanen

Linda Vallinkivi