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Marine Ecology Progress Series

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MEPS 606:29-38 (2018)  -  DOI:

Effects of tropical storms on the demography of reef corals

Andrew H. Baird1,*, Mariana Álvarez-Noriega1,2, Vivian R. Cumbo3, Sean R. Connolly1,2, Maria Dornelas4, Joshua S. Madin3,5

1ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia
2College of Science and Engineering, James Cook University, Townsville, QLD 4811, Australia
3Department of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia
4Centre for Biological Diversity, Scottish Oceans Institute, University of St. Andrews, KY16 9TH, UK
5Hawai‘i Institute of Marine Biology, University of Hawai‘i at Manoa, Kaneohe, Hawai‘i 96744, USA
*Corresponding author:

ABSTRACT: Disturbances, such as cyclones, have a major effect on the structure and dynamics of coral reef assemblages. However, the effect of cyclones on demographic traits, such as fecundity, has rarely been quantified, and direct estimates of mortality at the species level are rare. Here, we document the effect of Severe Tropical Cyclone Nathan on the demography of corals on the reef crest at Trimodal Reef in the northern Great Barrier Reef. Mortality rates based on tagged colonies were very high, ranging from 85.2% in Goniastrea retiformis to 100% in 6 Acropora species, 3 to 40 times higher than averages rates in the 5 yr preceding Cyclone Nathan. Fecundity was lower in 3 out of the 4 species examined following the cyclone, and egg carbon content was reduced by 58-63% in the 2 species examined. These results suggest that energy normally invested in reproduction was diverted to other processes such as injury repair and demonstrate that cyclones have important sub-lethal effects in addition to high rates of whole colony mortality. Coral cover was reduced from 34.9 ± 3.9% (mean ± SE) to 3.4 ± 1.5%, with reductions in the cover of all taxa except those with predominantly massive morphologies such as the Poritidae. A projected increase in the frequency of tropical storms as a result of global warming, combined with an increase in the frequency and scale of coral bleaching, suggest a fundamental shift in mortality regimes on reefs which has the potential to threaten their long-term persistence.

KEY WORDS: Coral reefs · Climate change · Demography · Disturbance · Recovery

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Cite this article as: Baird AH, Álvarez-Noriega M, Cumbo VR, Connolly SR, Dornelas M, Madin JS (2018) Effects of tropical storms on the demography of reef corals. Mar Ecol Prog Ser 606:29-38.

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