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The importance of Aquatic Biogeochemistry in ecosystem restoration Fri 11.3.

11.3.2016 klo 10:15 - 12:00

HY room B1-01-16 Niemenkatu 73 Lahti
Friday colloquium by Tom Jilbert, new Assistant Professor in Aquatic Biogeochemistry at the Department of Environmental Sciences


”Aquatic systems across the globe are suffering from cultural eutrophication. Human-induced loading of nutrients has altered ecosystem functioning in lakes and the coastal oceans, with negative impacts such as hypoxia, harmful algal blooms and benthic habitat loss. In many regions, this has led to a demand for better knowledge of nutrient cycling in order to implement sustainable restoration strategies.

Aquatic Biogeochemistry deals with the distribution in aquatic systems of the elements required for life. Ultimately, the trophic state of an ecosystem is determined by the distribution of the limiting macronutrients nitrogen (N) and phosphorus (P) in bioavailable forms. Although external inputs of N and P may trigger eutrophication, internal loading and regeneration, particularly of P, often sustain it many years after external loads are reduced. Because sediments are the locus of organic matter remineralization in aquatic systems, a comprehensive understanding of sedimentary biogeochemistry is critical to understanding nutrient cycles. A host of compounds, such as dissolved oxygen, ionic nitrate and sulfate, and particulate iron oxides, may be used by sedimentary microbes to mineralize organic matter. Furthermore, secondary reactions in sediments may transfer nitrogen and phosphorus between bioavailable and non-bioavailable forms. The combination of these reactions varies between (and within) aquatic systems, with strong impacts on the internal loading of nitrogen and phosphorus to the overlying water column.

I was recently appointed as Assistant Professor (Tenure Track) in Aquatic Biogeochemistry at the Department of Environmental Sciences.

With this presentation will introduce myself to the Department both in Lahti (Friday 11 March) and Viikki (Monday 14 March). I will demonstrate the importance of aquatic biogeochemistry, and in particular sediment biogeochemistry, to the understanding of eutrophied aquatic ecosystems and their restoration. I will present work I have done previously in the Baltic Sea and its coastal zone, and some plans for future studies in Lake Vesijärvi, a key research area of my new position."


Welcome everybody interested!

N.B. Niemi room B1-01-16 is located in connection of the coffee room of University of Helsinki Niemi unit.



10:15 - 12:00