In an attempt to estimate the monetary value of the services that ecosystems provide various methods of ecosystem valuation have been designed. Dollar-based valuation systems can include : travel cost, productivity, benefit transfer, and others. The Ecosystem Value Transfer (EVT)/Benefit Transfer Method (BTM) was used for this activity in which values which have already been estimated for similar ecosystems are extrapolated to the study site.
Navassa is a small (4.64 km2), uninhabited, an oceanic island approximately 50 km off the southwest tip of Haiti (Figure 4.1) under the jurisdiction of the U.S. Fish and Wildlife Service. The island is a raised dolomite plateau ringed by vertical cliffs that descend to a sloping submarine terrace at an approximate depth of 25 m, with coral reef development primarily on small nearshore ledges and shelves.