Cristian Gudasz

April 30, 2026

Rebekka Gullvåg

Cristian Gudasz

April 30, 2026

Rebekka Gullvåg
(PhD student)

Email: rebekka.gullvag@umu.se
Umeå University Webpage

Research Summary

I am studying the role of vascular plants in year-round carbon cycling in alpine/arctic ecosystems, using a combination of ecological and physiological methods.

Our Researchers

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Micael Jonsson

One part of my research investigates how the environment and human activities influence the species composition of ecological communities.

Jan Karlsson

My research focus is on impacts of climate change on the biogeochemistry and ecology of high latitude aquatic ecosystems.

Keith Larson

I am an evolutionary ecologist and science communicator and live at the Abisko Scientific Research Station, where I am the Project Coordinator for the Climate Impacts Research Centre. I am interested in how life history adaptations in Arctic and alpine species are shaped by the environment.

Ann-Kristin Bergström

Special focus within my research lies in studying the importance of organic matter (humic substances) and nutrients (nitrogen and phosphorus) for lake ecosystem productivity and food web structure.

Reiner Giesler

My research focuses on biogeochemical processes in terrestrial and aquatic ecosystems with special emphasis climate change effects in arctic and boreal environments.

Cristian Gudasz

My research aims at creating a new framework for understanding, quantifying and predicting the regional-scale sediment carbon sink in high latitude lakes, and its sensitivity to climate change.

Ryan Sponseller

My research focuses on the controls over ecosystem structure and functioning in streams, rivers, and watersheds. We study these systems to understand their condition as natural resources, but also as models to test general ecological and biogeochemical principles.

Johan Olofsson

My research interest deals with the effect of plant-herbivore interactions on plant community composition and processes in arctic and alpine ecosystems.

Ellen Dorrepaal

I am a plant ecologist with a passion for the ecosystems of cold areas. I am fascinated by their characteristic plant communities and by the plants’ abilities to survive harsh conditions through manipulation of their neighbours and their micro-environment.

Judith Sarneel

My research interest are (riparian) plant community composition and decomposition, for which I use the tea bag index.

Matthias B. Siewert

The core of my research is to gain a spatial understanding of Arctic carbon dynamics in plants and soils. In my postdoc, I use drones to investigate seasonal changes in tundra vegetation.

Gesche Blume-Werry

I am an ecosystem ecologist with a passion for high latitude ecosystems and am interested in the interplay of plants and their environment, specifically belowground.

Rebekka Gullvåg(PhD student)

Research Summary

The Climate Impacts Research Centre (CIRC) is based at theDepartment of Ecology, Environment and Geoscience

Rebekka Gullvåg
(PhD student)

The Climate Impacts Research Centre (CIRC) is based at the
Department of Ecology, Environment and Geoscience