‘Communities’ – whether local, regional, or transnational – can provide an essential force in the protection of our global underwater cultural heritage (UCH). As an issue of low political concern, with its protection vulnerable to externalities and compliance weaknesses, UCH forms an ideal test case for exploring governance solutions without reliance on the state. It is also an area where communities are increasingly integrated within governance models. This article examines the theoretical justification for reducing reliance on top-down laws to protect natural and cultural heritage, exploring Ostromian arguments for greater community self- and co-regulation. Using this theoretical framework, it highlights numerous advantages of community-oriented governance in the management of a complex global concern, such as UCH protection, and underscores the role and importance of the appropriate design of meta-regulation in steering communities towards wider public objectives. The article also identifies where communities or ‘networks’ have provided important additional protection for UCH, and discusses further policy mechanisms – such as community buy-in, incentivization, and self-regulation – which could help to facilitate community-led governance in the future.

Small-scale mariculture of high-value species for trade in remote islands can offer valuable alternative livelihoods to local communities. The endangered giant clam species Tridacna maxima is naturally abundant in some atolls in French Polynesia (FP) and has been the focus of commercial mariculture activities since 2012. Shortly after spat collectors became operational in two atoll lagoons, FP rose to become one of the main exporters of giant clams for the aquarium trade. However, this activity has been threatened recently by a mass clam-bleaching event triggered by the 2015–2016 El Niño. This study reviews the roles that international (Convention on International Trade in Endangered Species of Wild Fauna and Flora) and national regulatory frameworks play in the development of this activity in a small island context, and how they can indirectly promote better science and monitoring in order to inform adaptive management strategies. The links between the nine main groups of stakeholders show the necessary adaptation measures required to mitigate climate-driven mortalities. While this case study remains specific to giant clam farming in FP, general lessons are provided that could help in mitigating economic impacts from climate-related events on other islands.