1. Global Ecology, College of Science and Engineering Flinders University P.O. Box 2100 Adelaide South Australia 5001 Australia
2. School of Environmental Sciences Charles Sturt University P.O. Box 789 Albury New South Wales 2640 Australia
3. College of Science and Engineering Flinders University P.O. Box 2100 Adelaide South Australia 5001 Australia
4. Inland Waters South Australian Research and Development Institute 2 Hamra Ave West Beach South Australia 5024 Australia