1. Stream Biofilm and Ecosystem Research Laboratory, School of Architecture, Civil and Environmental Engineering École Polytechnique Fédérale de Lausanne Lausanne Switzerland
2. Now at Institute of Earth Surface Dynamics (IDYST) University of Lausanne Lausanne Switzerland
3. Now at Department of Biological Sciences Sam Houston State University Huntsville TX USA
4. Institute of Earth Surface Dynamics (IDYST) University of Lausanne Lausanne Switzerland