Ekosistem terumbu karang banyak dimanfaatkan sebagai destinasi wisata bahari khususnya snorkeling. Ekosistem terumbu karang di Pulau Pahawang menghadapi tekanan akibat aktivitas wisata yang tidak ramah lingkungan. Kerangka kerja Institutional Analysis Development (IAD) digunakan sebagai pendekatan untuk mengevaluasi pengaruh variabel eksogen yaitu kondisi biofisik, atribut komunitas dan aturan yang digunakan (rules-in-use) terhadap interaksi antar aktor dan pengelolaan ekowisata dengan menggunakan metode analisis structural equation modeling-partial least square (SEM-PLS) untuk menguji hubungan kausal antar variabel laten. Hasil menunjukkan bahwa pengelolaan ekowisata dan rules-in-use memiliki pengaruh signifikan terhadap performa pengelolaan, sedangkan peran aktor belum menunjukkan kontribusi signifikan. Atribut komunitas terbukti mempengaruhi aktor, terutama melalui kesamaan karakteristik dan tingkat pemahaman masyarakat. Meskipun terdapat inisiasi konservasi antara pihak akademisi dan masyarakat, implementasi pengelolaan masih terkendala oleh minimnya koordinasi antar pihak, dominasi aktor eksternal, serta keterbatasan kapasitas lokal. Edukasi dan pemberdayaan masyarakat menjadi kunci untuk penguatan pengelolaan ekowisata berkelanjutan. Penelitian ini menekankan pentingnya sinergi antar stakeholder dan penerapan aturan yang efektif dalam mendukung pelestarian terumbu karang serta peningkatan kesejahteraan masyarakat pesisir.Pahawang Island, Pesawaran Regency, Lampung Province has a coral reef ecosystem and is used as a primary resource for marine tourism, especially for snorkeling. The coral reef ecosystem on Pahawang Island faces pressure from environmentally unfriendly tourism. The Institutional Analysis Development (IAD) framework is used as an approach to evaluate the influence of exogenous variables, namely biophysical conditions, community attributes and rules-in-use on interactions between actors and ecotourism management using the structural equation modeling-partial least square (SEM-PLS) analysis method to test the causal relationship between latent variables. The results show that ecotourism management and rules-in-use have a significant influence on management performance, whereas the role of actors does not. Community attributes have been shown to influence actors, especially through similarities in their characteristics and levels of community understanding. Although there is a conservation initiative between academics and the community, its implementation is still constrained by limited coordination among parties, the dominance external actors, and limited local Capacity. Community education and empowerment are the keys to strengthening sustainable ecotourism management. This study emphasizes the importance of synergy between stakeholders and the implementation of effective regulations to support coral reef conservation and improving the welfare of coastal communities
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