Marine mammals play crucial roles in marine ecosystem function yet are threatened by increasing pressures from anthropogenic activities within marine ecosystems. Area-based Management Tools (ABMT) are key for their conservation and protection, yet their effectiveness is often hindered by lack of resources, technical capacity and political support. Yet, ABMTs are grounded in local, national, regional, and international agreements and policy frameworks including the Kunming-Montreal Global Biodiversity Framework (GBF). To support marine managers, the “Marine Mammals Management Toolkit” was developed and is composed of three core components, including the Self-Assessment Tool (SAT), founded on the Protected Area Management Effectiveness (PAME) framework, and is a multiple-choice tool that enables managers to evaluate the effectiveness of management plans regarding marine mammals through the production of a Management Effectiveness Score (MES). The SAT has been utilised across 24 MPAs in 18 countries. Two case studies are provided on its application. The Stellwagen Bank National Marine Sanctuary (SBNMS) evaluated their existing management plan, and scored an MES value of 7.8 with the Bermuda Marine Mammal Sanctuary (BMMS) scoring 4.7. The results of the SAT enabled the Bermudian Government to make informed decisions in developing a Marine Spatial Plan for the BMMS, and enables SBNMS to set a baseline to track effectiveness over the life-time of SBNMS and respective management plans; guiding local and national policy, as well as enabling Bermuda and the United States of America to contribute to their international commitments.
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