1. Department of Biodiversity, Earth and Environmental Science, Drexel University, Philadelphia, Pennsylvania, USA
2. Department of Ecosystem Research, Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany
3. Rhithron Associates, Inc., Missoula, Montana, USA
4. Division of Biological Sciences, University of Montana, Missoula, Montana, USA
5. Kansas Biological Survey and Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, Kansas, USA
6. National Snow and Ice Data Center, Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA