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. © 2009 by the Board of Regents of the University of Wisconsin System.