1. School of Marine and Tropical Biology; James Cook Univ.; P.O. Box 6811 Cairns QLD 4870 Australia
2. Advanced Magnetic Resonance Imaging and Spectroscopy Facility, McKnight Brain Institute; Univ. of Florida; Gainesville FL 32611
3. Smithsonian Tropical Research Institute; Apartado 0843-03092 Balboa Ancon