Observations of a new source of coral mortality along the Kenyan coast |
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Authors: | McClanahan Timothy R McLaughlin Shawn M Davy Joanne E Wilson William H Peters Esther C Price Kathy L Maina Joseph |
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Institution: | (1) The Wildlife Conservation Society, Bronx, NY 10460, USA;(2) NOAA NOS Cooperative Oxford Laboratory, 904 South Morris St., Oxford, MD 21654, USA;(3) Marine Biological Association, Citadel Hill, Plymouth, PL1 2PB, UK;(4) Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth, PL1 3DH, UK;(5) Tetra Tech, Inc., 10306 Eaton Place, Suite 340, Fairfax, VA 22030, USA;(6) Coral Reef Conservation Project, Mombasa, Kenya;(7) Present address: The Center for Marine Studies, University of Queensland, Brisbane, QLD, 4072, Australia |
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Abstract: | In early 2002 coral mortality occurred along 600 km of coastline from Tanzania to Kenya. Astreopora, Echinopora , and Montipora species were severely affected, with Montipora being nearly eliminated from Kenyan reefs. Acropora , Platygyra , Goniopora , and massive Porites were also affected; however, Porites and Goniopora rarely died and often recovered, whereas death for most other species occurred within 2 weeks. In Echinopora and Montipora , a dull ashy tissue color and brittle skeletons characterized the early stages of this event with a mucus layer on the tissue
surface in intermediate stages. Mucus and embedded debris then disappeared and surfaces were left covered in a white calcareous
dust that sometimes capped a black layer. Astreopora tissues became dull and pale, and seldom produced mucus; eventually the skeleton became bare and white. Either a colorless
translucent or brownish thin margin of tissue was visible between living tissue and bare skeleton, depending on species. Scanning
electron micrographs of affected corals revealed the presence of fungi. Histology and staining showed that the fungi were
mostly in the three genera that died from the syndrome and it may be that fungi invaded and killed corals weakened by another
unidentified pathogen. |
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Keywords: | Astreopora Echinopora coral disease coral histology marine fungi Montipora |
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