1. Department of Aquatic Ecology and Water Quality Management; Wageningen University; Wageningen; Netherlands
2. Laboratory of Aquatic Ecology, Institute of Biology; Federal University of Juiz de Fora; Juiz de Fora; Brazil
3. Instituto de Pesquisas Hidráulicas; Universidade Federal do Rio Grande do Sul; Porto Alegre; Brazil
4. Laboratorio de Ecología y rehabilitacíon de sistemas acuáticos, Facultad de Ciencias and CURE; Universidad de la República; Montevideo; Uruguay
5. Department of Biology; University of Miami; Coral Gables; Florida; USA
6. Cary Institute of Ecosystem Studies; Millbrook; New York; USA