Coral bleaching has impacted reefs worldwide and the predictions of near-annual bleaching from over two decades ago have now been realized. While technology currently provides the means to predict large-scale bleaching, predicting reef-scale and within-reef patterns in real-time for all reef users is limited. In 2020, heat stress across the Great Barrier Reef underpinned the region's third bleaching event in 5 years. Here we review the heterogeneous emergence of bleaching across Heron Island reef habitats and discuss the oceanographic drivers that underpinned variable bleaching emergence. We do so as a case study to highlight how reef end-user groups who engage with coral reefs in different ways require targeted guidance for how, and when, to alter their use of coral reefs in response to bleaching events. Our case study of coral bleaching emergence demonstrates how within-reef scale nowcasting of coral bleaching could aid the development of accessible and equitable bleaching response strategies on coral reefs. Also see the video abstract here: https://youtu.be/N9Tgb8N-vN0
K E Y W O R D Sbleaching alerts, climate adaptation, coral bleaching, coral reef
INTRODUCTION The continuing coral reefs crisisCoral reefs are now undergoing an unprecedented rate and severity of mass bleaching. [1][2][3][4][5][6][7] The first predictions of near-annual bleaching occurring globally by 2020 were published following the global mass bleaching event of 1998. [8] Bleaching studies since have documented that shallow reef environments, such as the lagoon, reef crest, and reef slopes to 6 m depth, are the most severely damaged as a result of bleaching. [9][10][11][12][13] These shallow-water reefs directly support the activities and livelihoods of millions of people worldwide [14][15][16] and bleaching disproportionally impacts these reef-reliant societies. [10,11] Given that different end-user groups utilize within-reef habitats in a