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A monetary valuation study of marine management in the Dutch Wadden Sea, the largest natural area of the Netherlands, is presented. The study is motivated by a conflict between shellfisheries and large populations of birds that forage on cockles. Different management scenarios are valued using multiple stakeholders, namely Dutch citizens, local residents, tourists, policy makers, and natural scientists. A considerable difference in willingness to pay (WTP) between these groups is found. In addition, the influence of motivational profiles is examined. Estimates confirm the presence of two such motivations, namely, material and moral warm glow. These allow for decomposition and correction of the WTP estimates. [ABSTRACT FROM AUTHOR]

Nunes, P. A. L. D., and Markandya, A. 2008. Economic value of damage caused by marine bio-invasions: lessons from two European case studies. – ICES Journal of Marine Science, 65: 775–780.We illustrate the use of alternative, non-market valuation methods to estimate the economic value of the social damage caused by marine bio-invasions. First, we present and discuss the motivation to perform an economic valuation of marine ecosystem quality in general and the protection of marine ecosystems against invasive species in particular. Second, we examine in detail two empirical applications of economic value assessment of social damage attributable to marine bio-invasions. One of these looks at ballast water management programmes in Rotterdam harbour, the Netherlands, and the second investigates management practices for the Manila clam in Venice Lagoon. Finally, we explore the relevance of this economic information for cost–benefit analysis and policy guidance. [ABSTRACT FROM PUBLISHER]

We examine the impact of providing a 'no-choice' option in attribute-based valuation experiments. The aim of the experiment was to assess monetary values of cockle fishery management practices in the Dutch Wadden Sea for different stakeholder groups, namely Dutch citizens, local residents and tourists. The current policy debate about the management of the Wadden Sea stresses the fact that individual preferences with respect to cockle-fishery differ. The aim of this article is to analyse the individual preferences in a objective way. Special attention is given to the influence of including a 'no-choice option', which is analysed using a nested logit model. We test whether the full set of options can be considered as close substitutes. The estimation results show that the influence of including the no-choice option differs among the stakeholders considered. [ABSTRACT FROM AUTHOR]