Abstract
Harmful algal bloom occurrences worldwide have prompted the testing and use of methods to control and mitigate their detrimental effects. This study investigates the potential of Philippine clay minerals to physically remove phytoplankton cells under laboratory conditions. Ball clay had the highest removal efficiency (∼95%) for Pyrodinium bahamense (paralytic shellfish poisoning causative organism) cells. A slight decrease in the efficiency by 10–20% was seen when culture volume was increased from 50 mL to 1 L. Removal efficiency was reduced to ∼95% when water motion was introduced. Removal of other phytoplankton species (Gymnodinium sanguineum, Amphidinium carterae, Pyrophacus horologium, Chatonella marina, and Alexandrium sp.) using ball clay was less efficient (<70%). Cell removal efficiencies differed with phytoplankton species belonging to the same taxonomic group. Possible mechanisms for cell removal are described.
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Acknowledgments
This study was made possible by the funding support from the Department of Science and Technology through the Philippine Council for Aquatic and Marine Research and Development (DOST-PCAMRD). The suggestions and revisions given by the reviewers are truly acknowledged. Kamille Manset helped in the preparation of the revised manuscript.
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Padilla, L.V., San Diego-McGlone, M.L. & Azanza, R.V. Exploring the potential of clay in mitigating Pyrodinium bahamense var. compressum and other harmful algal species in the Philippines. J Appl Phycol 22, 761–768 (2010). https://doi.org/10.1007/s10811-010-9517-7
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DOI: https://doi.org/10.1007/s10811-010-9517-7