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The impact of macroalgae and cyanobacteria on larval survival and settlement of the scleractinian corals Acropora palmata, A. cervicornis and Pseudodiploria strigosa

Abstract

Coral reefs are threatened by multiple stressors that degrade these ecosystems and the ecosystem services they provide. Critical to the recovery of coral reefs after a disturbance is coral recruitment, but there is still little information about the types of benthic habitats that different species of coral larvae require for settlement. Settlement in the presence of different algae and cyanobacteria was tested for three coral species, Acropora palmata, Acropora cervicornis and Pseudodiploria strigosa. The experiments were conducted in larval chambers placed on the reef to ensure that coral larvae were exposed to natural light, seawater temperature and some water flow. Rates of settlement and metamorphosis were assessed by providing these coral larvae with a standard preferred settlement substratum (individuals of the crustose coralline algal species Hydrolithon boergesenii) with an attached treatment of a small piece of live algae or benthic cyanobacteria. The brown algae Dictyota pulchella and D. bartayresiana did not affect the survival or settlement of larvae of A. palmata in 2010, but D. pulchella did reduce larval survival in 2009. Of the cyanobacteria tested, Caldora penicillata decreased A. palmata survival and settlement. For A. cervicornis, neither Dictyota pulchella nor D. bartayresiana reduced survival or settlement in either 2009 or 2010. Algae and cyanobacteria had no effect on Pseudodiploria strigosa larval survival, but there was reduced settlement in the presence of the cyanobacterium Hormothamnion enteromorphoides. These larval experiments show that some macrophytes can reduce coral larval survival and settlement even in the presence of highly preferred substrata.

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Data availability

The datasets generated and analyzed during the current study are available in the Zenodo repository, https://doi.org/10.5281/zenodo.3579577

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Acknowledgements

Special thanks to the many people who helped with coral spawning and counted thousands of larvae with us, including Scott Jones, Laura Diederick, Kathy Morrow, Sherry Reed and Nikki Fogarty. Thanks to Scott Jones and Zach Foltz who consistently facilitated our research on Carrie Bow Cay. Permits for research were provided by the Belize Fisheries Department. This is contribution 1131 of the Smithsonian Marine Station at Fort Pierce and 1035 of the Caribbean Coral Reef Ecosystems Program.

Funding

This work was funded by the Smithsonian Marine Science Network, the Hunterdon Oceanographic Endowment and the Caribbean Coral Reef Ecosystems (CCRE) program at the Smithsonian Institution.

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Correspondence to Raphael Ritson-Williams.

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Ritson-Williams, R., Arnold, S.N. & Paul, V.J. The impact of macroalgae and cyanobacteria on larval survival and settlement of the scleractinian corals Acropora palmata, A. cervicornis and Pseudodiploria strigosa. Mar Biol 167, 31 (2020). https://doi.org/10.1007/s00227-019-3639-5

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