This special issue comprises articles reporting research into wetlands. The common feature of this research is that it directed towards bridging the gap between science and policy. Research has been conducted explicitly to provide information which decision-makers can use for managing wetlands. The term ‘wetlands’ attempts to generalise the interface between water and land. It is an umbrella term, encompassing the very large range of terms used to describe such systems. Wetlands have been receiving considerable public and policy attention in recent years. It is now widely recognised that they provide many important goods and services to human societies. Examples include drinking water, flood mitigation, water quality control, fish, and recreational and residential opportunities. Wetlands also support various endangered, charismatic and migratory species. Increased interest in wetlands stems from recognition that human activities are compromising the ability of wetlands to deliver these goods and services. The greatest sources of stress on wetlands include: changes in land use with habitat loss and fragmentation; resource extraction; drainage and reclamation, and pollution. Various international agreements exist to protect wetlands and their dependent species, but despite this, many wetlands over the world are under threat. Turner et al. (2000) identify four main reasons for this: (1) market failures due to the public good nature of wetlands; (2) externalities caused by economic activities such as agriculture, industry, and water abstraction; (3) lack of understanding of the many values associated with wetlands due to the complexity and ‘invisibility’ of spatial relationships among groundwater, surface water and wetland species; and (4) frequent failure of policy intervention and land use planning due to inconsistent treatment of wetlands by economic, agriculture, environmental and nature protection policies. Wetland goods and services, and their future, is of prime concern to the Netherlands, which explains a bias in the research reported here. Much of the Netherlands is wetland, lying at the interface between land and water. Expected climate change will only exacerbate the struggle of this nation to secure its population and associated activities from high water levels. What are the key issues regarding wetland management at the moment? This special issue attempts to elaborate on a number of these issues, as well as taking on board the different perspectives of different disciplines. Disciplines represented in this special issue include management science, policy science, economics, hydrology, and ecology. Most articles draw on more than one of these. The articles may be grouped into three categories: the science-policy interface; scientific research and management; and policy and stakeholders. Two articles address the science-policy interface. The article by Goosen and Vellinga focuses on issues encountered in the Netherlands. An analysis of recent water management projects reveals constraints regarding: (1) national versus local goals; (2) limited sense of urgency among members of the public; (3) lack of coordination in the water management community; (4) unclear views about nature conservation; and (5) limited understanding of wetlands in relation to flood risk management. The authors propose platforms for collaborative planning as a way of improving stakeholder participation in early stages of decision-making. Negotiation and mediation support tools can enable stakeholders and mediators to formulate more purposely the problems that need to be addressed. The articles by Van der Werff and Lindahl and Soderqvist, also in this special issue, elaborate further on stakeholder participation. The article by Turner et al. explores four interrelated management problems—eutrophication of shallow lakes, sea level rise, flooding risks and tourism—in various wetland management options in the Norfolk and Suffolk Broads in the United Kingdom. They use the Driving Forces Pressure State Impact Response (DPSIR) framework to analyse the problem from an interdisciplinary ecological-economic perspective. Balancing various Received: 16 April 2004 / Accepted: 24 April 2004 Published online: 10 June 2004 a Springer-Verlag 2004
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