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Abstract
There has been recent debate over the role of predator-proof fences in the management
of New Zealand’s biodiversity. The debate has arisen due to concern that investments in
fenced sanctuaries are less productive than are alternative ways to manage biodiversity.
Predator-proof fences are costly and budget constraints limit the area of habitat that can be
fenced. The area of habitat enclosed within fences, and number of individuals of species
supported, determines project’s ability to contribute to biodiversity goals. Many fenced
sanctuary projects require substantial, continuing volunteer input to monitor fences and
other tasks. These projects often pursue a number of goals including species protection,
habitat restoration, education and community engagement. In this paper we examine
methods to evaluate fenced biodiversity projects. While Cost Benefit analysis can potentially
be used to evaluate these projects, cost - effectiveness measures and multi criteria analyses
provide useful ways to inform decision-makers.