Assessing carrying capacity using demographics, visitor experience and field studies: the case of Hanauma Bay Nature Preserve

The Hanauma Bay Nature Preserve (HBNP) was designated the first Marine Life Conservation District in Hawai'i in 1967. It is the most popular visitor snorkelling experience on the island of O'ahu. A social carrying capacity study was conducted upon reopening, following a nine-month COVID-19 closure due to travel restrictions. Surveys were compared to three prior surveys conducted between 1990 and 2002 to provide a larger historical context of social dynamics and perceived human impacts over time. Demographics, recreational activities, crowding perceptions, and educational availability were assessed. Visitor activity photos and counts were evaluated in context with survey responses. Perceived visitor contact on the reef was compared to in situ snorkelling impact. These quantitative observations reported an average of one reef disturbance for every two individuals. Photographic analysis of breakage of selected baseline corals prior to closure were compared to corals following reopening of the preserve in 2021. Partial mortality occurred in 60% of coral colonies. Successful management policies that include social carrying capacities should align with biological carrying capacities to balance the health of the ecosystem with a positive experience for visitors. These management strategies provide a holistic approach to advance conservation and meet visitor satisfaction goals. © 2023 Informa UK Limited, trading as Taylor & Francis Group.