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Algicidal effects of a novel marine Pseudoalteromonas isolate (Class Proeobacteria, Gamma Subdivision) on harmful algal bloom species of the genera Chattonella, Gymnodimium, and Heterosigma

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Lovejoy, C and Bowman, JP and Hallegraeff, GM (1998) Algicidal effects of a novel marine Pseudoalteromonas isolate (Class Proeobacteria, Gamma Subdivision) on harmful algal bloom species of the genera Chattonella, Gymnodimium, and Heterosigma. Applied and Environmental Microbiology, 64 (8). pp. 2806-2813. ISSN 0099-2240

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Abstract

During a bacterial survey of the Huon Estuary in southern Tasmania, Australia, we isolated a yellow-pigmented Pseudoalteromonas strain (class Proteobacteria, gamma subdivision), designated strain Y, that had potent algicidal effects on harmful algal bloom species. This organism was identified by I6S rRNA sequencing as a strain with close affinities to Pseudoalteromonas peptidysin. This bacterium caused rapid cell lysis and death (within 3 h) of gymnodinoids (including Gymnodinium catenatum) and raphidophytes (Chattonella marina and Heterosigma akashiwo). It caused ecdysis of armored dinoflagellates (e.g., Alexandrium catenella, Alexandrium minutum, and Prorocentrum mexicanum), but the algal cultures then recovered over the subsequent 24 h. Strain Y had no effect on a cryptomonad (Chroomonas sp.), a diatom (Skeletonema sp.), a cyanobacterium (Oscillatoria sp.), and two aplastidic protozoans. The algicidal principle of strain Y was excreted into the seawater medium and lost its efficacy after heating. Another common bacterial species, Pseudoalteromonas carrageenovora, was isolated at the same time and did not have these algicidal effects. The minimum concentrations of strain Y required to kill G. catenatum were higher than the mean concentrations found in nature under nonbloom conditions. However, the new bacterium showed a chemotactic, swarming behavior that resulted in localized high concentrations around target organisms. These observations imply that certain bacteria could play an important role in regulating the onset and development of harmful algal blooms.

Item Type: Article
Journal or Publication Title: Applied and Environmental Microbiology
Page Range: pp. 2806-2813
ISSN: 0099-2240
Copyright Information:

Copyright 1998 American Society for Microbiology

Date Deposited: 20 Jun 2017 01:33
Last Modified: 20 Jun 2017 01:33
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