Abstract
Localized bleaching (a discrete white area on the coral) was observed in one of the main framework-building corals in Hawaii, Porites compressa. This study aimed to determine the degree of virulence of the lesion. We investigated the whole-colony effects by following disease progression through time and examining the effect of localized bleaching on coral fecundity. After two months, 35 of 42 (83.3%) individually tagged colonies affected by localized bleaching showed tissue loss and partial colony mortality. Histological slides of healthy P. compressa and samples from colonies showing signs of localized bleaching were compared showing that affected colonies had a significant reduction (almost 50%) in gamete development, egg numbers, and egg size in the affected tissue. The observed localized bleaching results in both partial colony mortality and a reduced number of gametes and was termed Porites Bleaching with Tissue Loss (PBTL).
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Acknowledgments
We would like to greatly thank Christina Runyon for her assistance with sample collections and Alan Hoverd for his advice on histological techniques and supply of reagents. We would also like to thank Dr. Thierry Work for assistance with the interpretation of histological sections and Dr. Andrew Taylor for advice on the use of appropriate statistical methods. MS was supported by a VUW PhD Scholarship. SAP number 2009-101.
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Sudek, M., Aeby, G.S. & Davy, S.K. Localized bleaching in Hawaii causes tissue loss and a reduction in the number of gametes in Porites compressa . Coral Reefs 31, 351–355 (2012). https://doi.org/10.1007/s00338-011-0844-1
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DOI: https://doi.org/10.1007/s00338-011-0844-1