My research focuses on ecosystem functioning in stream ecosystem, especially when water bodies are under pressure. Healthy ecosystems can support ecosystem services, but these services can be compromised if the underlying ecosystem processes (e.g. ecosystem respiration, decomposition of detritus, productivity and nutrient uptake) are impaired. Getting a mechanistical understanding of the factors regulating ecosystem functioning is the main aim of my Phd since it is of the highest importance for management targeting ecosystem service provision.
1. Interactions between abiotic and biotic drivers of functioning, and effects of anthropogenic activities on those drivers.
Stream sites were chosen in Sweden to fall along three contrasting human disturbance gradients: nutrients, forestry and hydromorphological modificatopms (e.g. hydropower dams and ditches associated both with agriculture and forestry). The same gradients are being studied as part of the Swedish EPA funded project WATERS. This research allows for identification of the key drivers (environmental, keystone species, species traits) of functioning under different conditions of disturbance, and contributes to the development of assessment criteria for environmental degradation based on functional metrics.
2. Development of a “multifunctional perspective”, involving the quantification of multiple ecosystem processes to gain a more complete picture of functioning.
The extensive data previously collected, including multiple functional variables and the diversity and composition of four biological groups is used to study whether metacommunity processes at landscape scales have implications for local ecosystem functioning. Community composition and diversity are also characterised in terms of functional traits and food-web linkages. Sophisticated statistical techniques such as discontinuity analysis and structural equations modelling will assist in identifying where the major points of variation in functioning at a landscape scale are and in partitioning the effects on functioning arising directly from human disturbances compared with those arising from changes in community structure.
3. Application of a metacommunity framework for research on functioning, when biota are mobile and resources are patchily distributed.
Experimental manipulation has been conducted in a stream channel mesocosm (Finland) in collaboration with Romain Sarremejane, Timo Muotka and Heikki Mykrä. The aim of the experiment was to study patterns of colonization, responses of communities (microbes, macroinvertebrates, algae) and ecosystem processes (leaf decomposition, fungal and bacterial respiration, algal growth) under drought conditions when resources (leaf litter) are patchily distributed.
I got my Master degree in Ecology, Evolution, Biodiversity and Biometry from Lyon University (France) in 2011. I did my Master Thesis at Uppsala University working on phenotypic responses of Perch (Perca fluviatilis) to environmental changes and on predator-prey interactions in aquatic ecosystems.
I used to work as a lab and research assistant (SLU and Uppsala University) and as a study leader in a consulting and engineering office in France.
Brendan McKie, Department of Aquatic Sciences and Assessment, SLU.
David Angeler, Department of Aquatic Sciences and Assessment, SLU.
Frauke Ecke, Department of Wildlife, Fish, and Environmental Studies, SLU.
Richard Johnson, Department of Aquatic Sciences and Assessment, SLU.
Ryan Sponseller, Department of Ecology and Environmental Science, Umeå University.
Publikationer i urval
Truchy, A., Angeler, D. G., Sponseller, R. A., Johnson, R. K., & McKie, B. G. (2015). Chapter Two-Linking Biodiversity, Ecosystem Functioning and Services, and Ecological Resilience: Towards an Integrative Framework for Improved Management. Advances in Ecological Research, 53, 55-96.