The International Congress within the framework of the Managing Effects of the Global Climate on Estuarine Diversity and Productivity project, is scheduled for 5-8 April 2011 in Porto, Portugal. The theme is Estuaries in a Changing Climate. Topics include: Trophic interactions; Molecular evolution; Eco-physiology; Dynamic energy budgets modelling; Phylogeography studies; Population dynamics modelling; and Integrated Coastal Zone Management.