Island ecosystems have rich marine biodiversity and high levels of terrestrial endemism, but are potentially the most vulnerable to climate change and anthropogenic stressors. To effectively manage environments, scholars and conservation practitioners have increasingly turned their attention to local islander knowledge (LK) and practices. To date, much of the literature treats LK definitionally rather than examining its theoretical underpinnings. This review focuses explicitly on the concept of LK and it describes three discernible phases of research marked by conceptual shifts. Over the 20th century, LK underwent a dramatic reversal from something understood as inferior and deficient to something that is valuable and empirically sound. This shift ushered in widespread acceptance of local islander knowledge as a unique, rich corpus of information that could be tapped by Western science to enhance community-based resource management. Over the last several decades, a third phase of LK research has emerged in which a more dynamic framing has developed, emphasizing LK's hybrid and adaptive dimensions, as well as its constitutive entanglements with other social–ecological processes. This has expanded the scope of inquiry into the strategies islanders employ as they adapt to changing social and environmental milieus, and as they attempt to co-produce knowledge with scientists and conservation practitioners.

In the globally significant Australian tropical rainforests, poor performance of community-based natural resource management (CBNRM) approaches mandated by national policy highlights the importance of the global search for better models. This paper reports on co-research to develop, apply and test the transferability and effectiveness of a new model and tools for CBNRM in biodiversity conservation. Adaptive co-management, designed with specific communities and natural resources, recognized as linked multi-scalar phenomena, is the new face of CBNRM. New tools used to achieve adaptive co-management include a collaborative focal species approach focused on the iconic southern cassowary, scenario analysis, science brokering partnerships, a collaborative habitat investment atlas and institutional brokering. An intermediate-complexity analytical framework was used to test the robustness of these tools and therefore likely transferability. The tools meet multiple relevant standards across three dimensions, namely empowering institutions and individuals, ongoing systematic scientific assessment and securing effective on-ground action. Evaluation of effectiveness using a performance criteria framework identified achievement of many social and environmental outcomes. Effective CBNRM requires multi-scale multi-actor collaborative design, not simply devolution to local-scale governance. Bridging/boundary organizations are important to facilitate the process. Further research into collaborative design of CBNRM structures, functions, tools and processes for biodiversity conservation is recommended.