AME 50:251-259 (2008)  -  DOI: https://doi.org/10.3354/ame01167

Influence of microbial interactions on the susceptibility of Karenia spp. to algicidal bacteria

Patricia B. Roth1,2, Christina M. Mikulski1, Gregory J. Doucette1,*

1Marine Biotoxins Program, NOAA/National Ocean Service, 219 Fort Johnson Road, Charleston, South Carolina 29412, USA
2Graduate Program in Marine Biology, College of Charleston, Grice Marine Biological Laboratory, 205 Fort Johnson Road, Charleston, South Carolina 29412, USA
*Corresponding author. Email:

ABSTRACT: A bacterial strain (D38BY) belonging to the family Flavobacteriaceae and antagonistic towards an algicidal bacterium (strain S03; Flavobacteriaceae) was isolated from a culture of the red tide dinoflagellate Karenia brevis that had previously been characterized as resistant to attack by strain S03. This antagonistic bacterium increased the survival time of otherwise susceptible, bacteria-free K. brevis cultures in a concentration-dependent manner during exposure to the algicidal bacterium. Experimental evidence indicated that direct contact was required in order for strain D38BY to inhibit the killing activity of algicidal strain S03. While further work is needed to determine its precise mode of action, the antagonistic properties of strain D38BY provide further evidence that the resistance or susceptibility of certain algal taxa to algicidal attack can be more a function of interactions within the ambient microbial community than an intrinsic property of the alga.


KEY WORDS: Algicidal bacteria · Antagonism · CFB complex · Karenia brevis · Microbialinteractions


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Cite this article as: Roth PB, Mikulski CM, Doucette GJ (2008) Influence of microbial interactions on the susceptibility of Karenia spp. to algicidal bacteria. Aquat Microb Ecol 50:251-259. https://doi.org/10.3354/ame01167

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