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The brooding reef-building octocoral  Heliopora  is widespread on Indo-West Pacific reefs and appears to be relatively resistant to thermal stress, which may enable it to persist locally while scleractinians diminish under Anthropocene conditions. However, basic physiological measurements of “blue corals” are lacking and prevent their inclusion in trait-based studies. We address this by quantifying rates (mean ± SE) of linear extension (0.86 ± 0.05 cm yr −1 ) and skeletal density (2.01 ± 0.06 g cm −3 ) to estimate calcification rates (0.87 ± 0.08 g cm −2  yr −1 ) for the small branching/columnar morphology of  Heliopora coerulea . We postulate that  H. coerulea  may become an increasingly important reef-builder under ocean warming due to its relative resistance to thermal stress and high skeletal density that make colonies less vulnerable to storm damage under ocean acidification. Moreover,  Heliopora  corals are likely dispersal limited suggesting they may be an underappreciated genus for restoration of stress-tolerant reef-building capacity on degraded reefs.

Linear extension, skeletal density, and calcification rates of the blue coral Heliopora coerulea