1. Hopkins Marine Station of Stanford University, 120 Oceanview Blvd., Pacific Grove, CA 93950, USA.
2. Harvard University Center for the Environment, 24 Oxford Street, Cambridge, MA 02138, USA.
3. University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 4N1, Canada.
4. Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada.
5. University of California Davis, One Shields Avenue, Davis, CA 95616, USA.
6. Moss Landing Marine Laboratories, 8272 Moss Landing Road, Moss Landing, CA 95039, USA.