1. Ecosystem Management, University of New England, Armidale, New South Wales, Australia, 2351
2. Aquatic Ecosystem Biology, CEMAGREF-Lyon 3 bis quai Chauveau, F-69336 Lyon cedex 09, France
3. Department of Watershed Sciences, Utah State University, 5210 Old Main Hill, Logan, Utah 84321 USA
4. Department of Freshwater Conservation, Brandenburg University of Technology Cottbus, Seestraße 45, D-15526 Bad Saarow, Germany
5. Flathead Lake Biological Station, The University of Montana, 32111 BioStation Lane, Polson, Montana, 59860 USA