1. School of Geography, Earth and Environmental Sciences, and Institute for Global Innovation University of Birmingham Edgbaston Birmingham B15 2TT UK
2. Fluvial Geomorphology Group Stroud Water Research Center Avondale Pennsylvania 19311 USA
3. Ecosystem Ecology Group Stroud Water Research Center Avondale Pennsylvania 19311 USA
4. Microbiology Group Stroud Water Research Center Avondale Pennsylvania 19311 USA
5. Department of Natural Resources College of Agriculture and Life Sciences (CALS) at Cornell University Ithaca New York 14853 USA
6. Department of Geography, Geology and Planning Missouri State University Springfield Missouri 65897 USA
7. Ecologie des Hydrosystèmes Naturels et Anthropisés (LEHNA) Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR5023 Villeurbanne France