Colony size was quantified as the diameter (in centimeters) along the longest axis of the coral in planar view from the photoquadrat images (van Woesik et al. 2011). The size of a colony was not recorded if the colony was only partially in the frame and the longest axis could not be identified. Excluding these colonies will only reduce the precision of size‐dependent bleaching and mortality. As a result, size was measured for 641 out of 1,023 (62%) colonies assigned to a bleaching category in May 2019, and 1,125 out of 1,186 (95%) of colonies observed in February 2019 and categorized as alive or dead in August 2019. Size was estimated using ImageJ software (Schneider et al. 2012). Each photograph included a reference scale with which each image was individually size calibrated. The smallest colony size detectable in the images was ~2 cm. For assessment of the repeatability of colony size estimates from images, see Appendix S1.

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