Inhibitory effects of centric diatoms on the growth of the dinoflagellate Akashiwo sanguinea

Tadashi Matsubara, Sou Nagasoe, Yasuhiro Yamasaki, Tomoyuki Shikata, Yohei Shimasaki, Yuji Oshima, Tsuneo Honjo

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11 Citations (Scopus)


Results of a four-year study on phytoplankton in Hakozaki Harbor, Hakata Bay, Japan indicated that Akashiwo sanguinea (Hirasaka) Hansen et Moestrup was the cause of frequent blooms during the late fall period when centric diatoms such as Skeletonema costatum and genus Chaetoceros declined. In laboratory experiments, the growth of A. sanguinea was found to be strongly inhibited in bi-algal cultures with S. costatum and Chaetoceros didymum, but just slightly with Asterionella japonica. Furthermore, when A. sanguinea was cultured in nitrogen and phosphorus enriched filtrates with media on which S. costatum and C. didymum had grown densely, the growth rate of A. sanguinea in the filtrates was significantly lower than that in fresh control medium. These results suggest that in spring and summer allelopathy of bloomed centric diatoms was an important factor that inhibited the growth of A. sanguinea but in the late fall when the cell density of these diatoms declined, A. sanguinea could form blooms.

Original languageEnglish
Pages (from-to)598-606
Number of pages9
JournalNippon Suisan Gakkaishi (Japanese Edition)
Issue number4
Publication statusPublished - Jul 2008

All Science Journal Classification (ASJC) codes

  • Aquatic Science


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