1. Australian Rivers Institute Griffith University Nathan QLD 4111 Australia
2. Pronatura Sur A.C. México
3. CINVESTAV Centro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional Mérida México
4. Scripps Institution of Oceanography UCSD La Jolla CA 92093 USA
5. Department of Fisheries and Wildlife Oregon State University Corvallis OR 97331 USA
6. Woods Hole Research Centre Falmouth MA USA