Allelopathic effects of the dinophyte Prorocentrum minimum on the growth of the bacillariophyte Skeletonema costatum |
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| Authors: | Masayuki Tameishi Yasuhiro Yamasaki Sou Nagasoe Yohei Shimasaki Yuji Oshima Tsuneo Honjo |
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| Institution: | 1. Laboratory of Marine Environmental Science, Division of Marine Biological Chemistry, Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, 6-10-1, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan;2. Harmful Algal Bloom Division, National Research Institute of Fisheries and Environment of Inland Sea, 2-17-5 Maruishi, Hatsukaichi, Hiroshima 739-0452, Japan;1. Key Laboratory of Applied Marine Biotechnology (Ningbo University), Ministry of Education, Ningbo, China;2. Institute of Marine and Environmental Technology, University of Maryland Center for Environmental Science, Baltimore, MD, USA;1. College of Life Science and Technology, Key Laboratory of Aquatic Eutrophication and Control of Harmful Algal Blooms of Guangdong Higher Education Institute, Jinan University, Guangzhou 510532, China;2. Third Institute of Oceanography, SOA, Xiamen 361005, China;3. Zhongshan Entry-Exit Inspection and Quarantine Bureau Technology Center, Zhongshan 528403, China |
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| Abstract: | We investigated growth interactions between the dinophyte Prorocentrum minimum and the bacillariophyte Skeletonema costatum using bi-algal cultures under axenic conditions. When low cell densities of P. minimum and high cell densities of S. costatum were inoculated into the same medium, growth of P. minimum was suppressed. Other inoculum combinations resulted in reduced S. costatum maximum cell densities. A mathematical model was used to simulate growth and interactions of P. minimum and S. costatum in bi-algal cultures. The model indicated that P. minimum always outcompeted S. costatum over time. Enriched filtrate from low-density P. minimum cultures significantly stimulated S. costatum growth, but enriched filtrate from high-density P. minimum cultures notably inhibited the growth of S. costatum. Growth of P. minimum was not affected by enriched filtrate from cultures of P. minimum at any density. Filtrates of P. minimum cultures were fractionated by ultrafiltration (molecular weight cutoff >3000 Da), and retentate that included polysaccharide(s) significantly inhibited the growth of S. costatum. |
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