NDLI: Ecological Physiology of a Coral Pathogen and the Coral Reef Environment

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Microbial Ecology : Volume 51, Issue 2, February 2006

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Ecological Physiology of a Coral Pathogen and the Coral Reef Environment

Content Provider	Springer Nature Link
Author	Remily, Elizabeth R. Richardson, Laurie L.
Copyright Year	2006
Abstract	Laboratory studies on the ecological physiology of a coral pathogen were carried out to investigate growth potential in terms of environmental factors that may control coral diseases on reefs. The disease chosen for this study, white plague type II, is considered to be one of the major diseases of Caribbean scleractinian corals, affecting a wide range of coral hosts and causing rapid and widespread tissue loss. It is caused by a single pathogen, the bacterium Aurantimonas coralicida. A series of laboratory experiments using a pure culture of the pathogen was carried out to examine the roles of temperature, pH, and O2 concentration on growth rate. Results revealed optimal growth between 30 and 35°C, and between pH values of 6 and 8. There was a distinctive synergistic relationship between pH and temperature. Increasing temperature from 25 to 35°C expanded the range of pH tolerance from a minimum of 6.0 down to 5.0. O2 concentration directly affected growth rate, which increased with increasing O2. The combined effects of increasing O2 and increasing temperature resulted in a synergistic effect of more rapid growth. These laboratory results are discussed in terms of the coral host and the range of the environmental factors that occur on coral reefs. We conclude that changing environmental conditions in the reef environment, in particular observed increases in water temperature, may be promoting coral diseases by allowing coral pathogens to expand their ecological niches. In the case of the white plague type II pathogen, elevated temperature would allow A. coralicida to colonize the low pH environment of the coral surface mucopolysaccharide layer as an initial stage of infection. The synergistic effect between temperature and oxygen concentration appeared to be less environmentally relevant for this coral pathogen.
Starting Page	345
Ending Page	352
Page Count	8
File Format	PDF
ISSN	00953628
Journal	Microbial Ecology
Volume Number	51
Issue Number	3
e-ISSN	1432184X
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-04-06
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article
Subject	Soil Science Ecology Ecology, Evolution, Behavior and Systematics

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