Canadian Science Advisory Secretariat (CSAS) Research Document 2013/129 Quebec region May 2014 Ecosystem perspective on changes and anomalies in the Gulf of St. Lawrence: a context in support of the management of the St. Lawrence beluga whale population Stéphane Plourde, Peter S. Galbraith, Véronique Lesage, François Grégoire, Hugo Bourdages, Jean-François Gosselin, Ian McQuinn, Michael Scarratt Fisheries and Oceans Canada Institut Maurice-Lamontagne 850, Route de la Mer Mont-Joli, Québec CANADA G5H 3Z4