Imprecise and weakly assessed: evaluating voluntary measures for management of marine protected areas

Voluntary measures may be an alternative or addition to legislation for marine protected areas (MPAs), yet the effectiveness of these measures is rarely analyzed. The application and effectiveness of voluntary measures was reviewed for MPA management in developed nations where complex jurisdictions and legislative processes make voluntary measures appealing to management. Four types of voluntary measures were identified: sacrifice of access, sector- or activity-specific restrictions, voluntary stewardship, and education or outreach, with sector- or activity-specific measures being the most common.