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    Planning predator exclusion fences for wildlife reintroduction requires considering ongoing management costs. Two smaller fences are often more cost-efficient long-term than a single large fence, especially amid uncertainty.

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    Area of Science:

    • Conservation Biology
    • Ecological Management
    • Wildlife Reintroduction

    Background:

    • Predator exclusion fences are crucial for protecting reintroduced threatened wildlife from invasive alien species.
    • Reserve planning frameworks, like the Single Large or Several Small (SLOSS) principle, must incorporate the complexities of continuous management.
    • The reintroduction of bilbies (Macrotis lagotis) in arid Australia presents a relevant case study for evaluating fence strategies.

    Purpose of the Study:

    • To compare the long-term cost-efficiency of a single large versus two smaller predator exclusion fences.
    • To assess the impact of demographic and environmental uncertainty on the cost-effectiveness of different fencing strategies.
    • To provide guidance for managers planning wildlife reintroduction projects involving predator exclusion.

    Main Methods:

    • Economic analysis comparing the net cost of single large versus two small predator exclusion fences over the long term.
    • Sensitivity analysis to evaluate the robustness of cost-efficiency findings under various demographic and environmental uncertainties.
    • Modeling the cost-effectiveness within the context of bilby reintroduction in arid Australia.

    Main Results:

    • A single large predator exclusion fence frequently results in a significantly higher net cost compared to two smaller fences.
    • The cost-efficiency of employing two smaller fences is robust and remains favorable even with substantial demographic and environmental uncertainty.
    • The findings suggest that smaller, multiple-fenced reserves can mitigate financial risks in long-term conservation projects.

    Conclusions:

    • For wildlife reintroduction projects, particularly in arid environments like Australia, planning for two smaller predator exclusion fences is generally more cost-efficient than one large fence.
    • The superior cost-efficiency of the two-fence strategy provides a more resilient approach to managing financial risks associated with conservation efforts.
    • Managers can utilize these findings to make informed decisions, mitigating long-term costs and enhancing the success of threatened species reintroductions.