On June 30, Dr. Alba Argerich (Oregon State University) presented a StreamChem communication at the Symposium for European Freshwater Sciences (SEFS). SEFS is Europe's largest forum for freshwater science, which brings together scientists from numerous aquatic disciplines. The Symposium is coordinated by the European Federation for Freshwater Sciences (EFFS) and is held every two years in a different European city. This time the conference took place in Girona (Catalonia, Spain) and brought together researchers from Europe and US for five days to discuss the topic "Freshwater ecosystems- Challenges between conservation and management under global change". The communication presented the results of the analysis of temporal trends in stream nitrogen concentrations in forested reference basins of several Experimental Forest Sites.