A permanent transect of 243 C. caespitosa colonies was annually monitored in the Columbretes Islands from 2002 to 2017. Each colony was examined after the summer, when mortality-triggering thermal anomalies occur, and the extent of the necrosed surface was recorded with photographs and sketches (8). Monitoring of the permanent coral transect allowed not only the quantification of necrosis (8) but also the accurate assessment and quantification of the short- and long-term evolution of each colony after the necrosis events. In summary, this methodology has allowed us to obtain detailed (annual resolution) quantitative information on the life histories of 243 C. caespitosa colonies over 16 years.

Close visual inspection of necrosed colony areas, together with macrophotography, was performed to identify surviving polyps. Additional macrophotographs of rejuvenated polyps on dead, warming-affected colonies, previously cleaned of remaining organic matter using H2O2 were taken in the laboratory.

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