Seasonal coupling and de‐coupling of net calcification rates from coral reef metabolism and carbonate chemistry at Ningaloo Reef, Western Australia

Research at Ningaloo Reef reveals that net calcification rates remain stable year-round, defying seasonal expectations. Despite a twofold decrease in daily light and only slight temperature changes from summer to winter, net calcification rates showed no significant seasonal variation (190 ± 40 mmol CaCO3 m−2 d−1 in summer vs. 200 ± 10 mmol CaCO3 m−2 d−1 in winter). While summer calcification was linked to diurnal changes in light, pH, and aragonite saturation state (Ωar), winter rates decoupled from these factors, suggesting the reef may have reached a threshold where calcification becomes insensitive to environmental fluctuations. The study also found no significant seasonal differences in nitrogen uptake or gross primary production, which were only 33% higher in summer than winter.

Falter, J. L., Lowe, R. J., Atkinson, M. J., & Cuet, P. (2012). Seasonal coupling and de‐coupling of net calcification rates from coral reef metabolism and carbonate chemistry at Ningaloo Reef, Western Australia. Journal of Geophysical Research: Oceans, 117(C5). Portico. https://doi.org/10.1029/2011jc007268