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Coral mortality and interaction with algae in relation to sedimentation

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Abstract

The impact of sedimentation on coral–algal interactions was studied by monitoring tissue mortality and radial growth in two coral species, Colpophyllia natans and Siderastrea siderea, over a continuum of sediment input intensities. This study sets out to investigate (1) whether sedimentation can facilitate algal overgrowth of corals and (2) whether this was a significant cause of coral mortality. Over a 15-month period, 198 coral colonies were tagged and photographed at six sites along two replicate gradients of sediment input, spanning high inputs near river mouths to low inputs at exposed headlands. Photographs were taken so that they covered the interface between colonies and algae. Radial growth was measured along colony edges in contact with algae and unaffected by tissue loss from causes other than competition with algae. To establish whether algal overgrowth was a significant cause of coral mortality, tissue mortality on the colony surface area visible in the photographs was related to different causes, including sediment smothering, disease, and algal overgrowth. Radial growth became negative with increasing proximity to river mouths in C. natans and remained negative or close to zero throughout the gradients in S. siderea, overall suggesting that sedimentation can facilitate algal overgrowth on corals. However, the analysis of tissue mortality revealed that algal overgrowth was a relatively minor cause of tissue loss. In contrast, the most important cause of coral mortality in relation to sedimentation was from sediment smothering, probably during intense episodes of deposition associated with heavy rainfall. We conclude that sedimentation may lead to reef degradation by causing coral mortality through sediment smothering and burial, and then by suppressing the regrowth of surviving adult colonies through increased competition with algae.

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Acknowledgements

We thank the St. Lucia Department of Fisheries, Soufrière Marine Management Area, Soufrière Foundation, and Scuba St. Lucia for their continuing support of our work. We much appreciate the help and involvement of staff from these organizations including Horace Walters, Sarah George, Dawn Pierre-Nathaniel, Susannah Scott, Kai Wulf, and Karyn and Michael Allard. Thanks are also due to Roger Malone, Daniel Nugues, Randolph Nicholas, Tessa McGarry, Chris Schelten, Annalie Morris, Rachel Miller, and Douane Joseph for assistance with field work, Allan Smith for technical assistance, and Jaap van der Meer for help with statistical analyses. The comments of Evan Edinger and an anonymous reviewer greatly improved the manuscript. This research was supported by grants from the UK Darwin Initiative and NERC secured by C.R.

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  1. M. M. Nugues

    Present address: Netherlands Institute for Sea Research (NIOZ), P.O. Box 59, 1790 AB , Den Burg, Texel, The Netherlands

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  1. Environment Department, University of York, York , YO10 5DD, UK

    M. M. Nugues & C. M. Roberts

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Correspondence to M. M. Nugues.

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Nugues, M.M., Roberts, C.M. Coral mortality and interaction with algae in relation to sedimentation. Coral Reefs 22, 507–516 (2003). https://doi.org/10.1007/s00338-003-0338-x

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