Institution: | a Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science P.O. Box 38, Solomons, MD 20688, USA; Phone: 410-326-7373; e-mail: frisk{at}cbl.umces.edu
b National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Northeast Fisheries Science Center Woods Hole, Massachusetts, 02543, USA |