Epilithic biofilms as hotspots of in-stream nitrification in a high N loaded urban stream

Susana Bernal1, Steffi N Merbt2, Miquel Ribot1, Emilio O Casamayor1 and Eugenia Martí Roca1, (1)CEAB-CSIC, Girona, Spain, (2)Eawag, Environmental Toxicology, Dübendorf, Switzerland