1. a Physical and Chemical Sciences, Department of Fisheries and Oceans , Scotia-Fundy Region, Bedford Institute of Oceanography (BIO) , P.O. Box 1006, Dartmouth , N.S. , Canada , B2Y 4A2
2. b Atlantic Research Laboratory (ARL), National Research Council of Canada , 1411 Oxford Street, Halifax , N.S. , Canada , B3H 3Z1
3. c Department of Fisheries and Oceans , Gulf Fisheries Centre , P.O. Box 5030, Moncton , N.B. , Canada , E1C 9B6