1. J. J. Magnuson is at the Center for Limnology, University of Wisconsin, Madison, WI 53706, USA.
2. C. Safina is at the National Audubon Society, Living Oceans Program, Islip, NY 11751, USA.
3. M. P. Sissenwine is at Northeast Fisheries Science Center, Woods Hole, MA 02543, USA.