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Applied and Environmental Microbiology, November 2004, p. 6855-6864, Vol. 70, No. 11
0099-2240/04/$08.00+0 DOI: 10.1128/AEM.70.11.6855-6864.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.
University of South Carolina, Columbia,1 Hollings Marine Laboratory, Medical University of South Carolina, Charleston,3 University of South Carolina, Aiken, South Carolina,6 Howard University, Washington, District of Columbia,2 Global Coral Reef Alliance, Cambridge, Massachusetts,4 Georgia Institute of Technology, Atlanta, Georgia5
Received 20 April 2004/ Accepted 29 June 2004
The bacterial and temperature factors leading to yellow blotch/band disease (YBD), which affects the major reef-building Caribbean corals Montastrea spp., have been investigated. Groups of bacteria isolated from affected corals and inoculated onto healthy corals caused disease signs similar to those of YBD. The 16S rRNA genes from these bacteria were sequenced and found to correspond to four Vibrio spp. Elevating the water temperature notably increased the rate of spread of YBD on inoculated corals and induced greater coral mortality. YBD-infected corals held at elevated water temperatures had 50% lower zooxanthella densities, 80% lower division rates, and a 75% decrease in chlorophyll a and c2 pigments compared with controls. Histological sections indicated that the algal pyrenoid was fragmented into separate segments, along with a reconfiguration and swelling of the zooxanthellae, as well as vacuolization. YBD does not appear to produce the same physiological response formerly observed in corals undergoing temperature-related bleaching. Evidence indicates that YBD affects primarily the symbiotic algae rather than coral tissue.
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