Defining performance thresholds for effective management of biodiversity within protected areas

Area of Science:

• Conservation science
• Protected area management
• Ecological monitoring

Background:

• Performance thresholds are vital for evaluating conservation success and defining ecological condition.
• The International Union for the Conservation of Nature (IUCN) Green List Standard emphasizes performance thresholds for protected area (PA) management.

Purpose of the Study:

• To assess the specificity and measurability of performance thresholds used by PAs on the IUCN Green List.
• To identify characteristics of well-defined performance thresholds and develop recommendations for improvement.

Main Methods:

• Analysis of 349 performance thresholds from Green List PAs.
• Evaluation of thresholds for quantitative definition and presence of ambiguous terms.
• Categorization of threshold expression methods.

Main Results:

• Many thresholds were expressed as management objectives rather than ecological conditions.
• Approximately 50% of thresholds lacked the specificity to clearly define successful outcomes.
• Six distinct methods of expressing thresholds were identified.

Conclusions:

• Robust performance thresholds require quantitative definitions and limits of acceptable change (LAC).
• Transparency is enhanced by providing rationale and evidence for thresholds and LACs.
• Clear, quantitative thresholds with LACs objectively demonstrate conservation success and aid PA management.