1. a California Department of Water Resources, Division of Environmental Services , Aquatic Ecology Section , 901 P Street, Sacramento , California , 95814 , USA
2. b Department of Fish, Wildlife, and Conservation Biology , University of California at Davis , One Shields Avenue, Davis , California , 95616 , USA
3. c U.S. Environmental Protection Agency , 75 Hawthorne Street, San Francisco , California , 94105 , USA
4. d U.S. Geological Survey , 6000 J Street, Placer Hall, Sacramento , California , 95819 , USA