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Open AccessArticle

Viral and Bacterial Epibionts in Thermally-Stressed Corals

1
Institute of Research for Development (IRD), National Center for Scientific Research (CNRS), UMR MARBEC, Montpellier 34095 cedex, France
2
Institute of Oceanography (IO), Vietnam Academy of Science and Technology (VAST), Nha Trang 650000, Vietnam
3
Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi, 100000, Vietnam
*
Author to whom correspondence should be addressed.
Present address: IRD—Van Phuc Diplomatic Compound, Bldg 2G, Appt 202, 298 Kim Ma, Ba Dinh, Hanoi 100000, Vietnam.
Academic Editor: Jose Victor Lopez
J. Mar. Sci. Eng. 2015, 3(4), 1272-1286; https://doi.org/10.3390/jmse3041272
Received: 2 August 2015 / Accepted: 19 October 2015 / Published: 22 October 2015
(This article belongs to the Special Issue Marine Microbial Communities: Biodiversity, Composition and Function)
The periodic rise in seawater temperature is one of the main environmental determinants of coral bleaching. However, the direct incidence of these episodic thermal anomalies on coral-associated microbiota and their subsequent effects on coral health are still not completely understood. In this study, we investigated the dynamics of three main microbial communities of the coral holobiont (e.g., Symbiodinium, bacteria and viruses), during an experimental thermal stress (+4 °C) conducted on the scleractinian Fungia repanda. The heat-treatment induced coral bleaching after 11 days and resulted in a final elevation of ca. 9, 130 and 250-fold in the abundance of mucosal viruses, bacteria, and Symbiodinium, respectively. On the contrary, the proportion of actively respiring bacterial cells declined by 95% in heat-stressed corals. The community composition of epibiotic bacteria in healthy corals also greatly differed from bleached ones, which also exhibited much higher production rates of viral epibionts. Overall, our results suggest that the shift in temperature induced a series of microbial changes, including the expulsion and transfer of Symbiodinium cells from the coral polyps to the mucus, the collapse of the physiological state of the native bacterial associates, a substantial alteration in their community structure, and accompanied by the development of a cortege of highly active virulent phages. Finally, this study provides new insights into the environmentally-driven microbial and viral processes responsible for the dislocation of the coral holobiont. View Full-Text
Keywords: coral bleaching; thermal stress; bacteria; viruses; holobiont; Vietnam coral bleaching; thermal stress; bacteria; viruses; holobiont; Vietnam
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MDPI and ACS Style

Nguyen-Kim, H.; Bouvier, T.; Bouvier, C.; Bui, V.N.; Le-Lan, H.; Bettarel, Y. Viral and Bacterial Epibionts in Thermally-Stressed Corals. J. Mar. Sci. Eng. 2015, 3, 1272-1286.

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