Relationships between occurrences of toxic Dinophysis species (Dinophyceae) and small phytoplanktons in Japanese coastal waters

Goh Nishitani, Mineo Yamaguchi, Akira Ishikawa, Satoshi Yanagiya, Tadashi Mitsuya, Ichiro Imai

研究成果: Article査読

21 被引用数 (Scopus)

抄録

Fluctuations of the genus Dinophysis, which contained several toxic species of diarrhetic shellfish poisoning (DSP), were investigated during blooms in Hiroshima Bay, Mutsu Bay and Ise Bay, Japan. The co-occurrences of small phytoplanktons (cryptophytes, other nanophytoplanktons, cyanobacteria and eukaryotic picophytoplanktons) were investigated to search for relationships with mixotrophic Dinophysis. Cryptophytes were divided into three size-groups based on length of their chloroplasts (>10, 5-10 and <5 μm) during counting by epifluorescence microscopy. Clear relationships were not found between the occurrences of Dinophysis spp. and nanophytoplanktons, cyanobacteria and eukaryotic picophytoplanktons. However, the fluctuations of small-sized cryptophytes (<5 μm) showed a close relationship with that of D. acuminata in Hiroshima Bay. In Mutsu Bay, small-sized cryptophytes also accompanied the first occurrence peak of Dinophysis spp. In Ise Bay, peaks of the occurrences of middle- and small-sized cryptophytes were observed 2-3 weeks before the peak of D. acuminata. These cryptophytes decreased rapidly with increase in D. acuminata. These results suggest the possibility that small-sized cryptophytes may be food organisms for mixotrophic Dinophysis, with the abundance of Dinophysis dependent on these cryptophytes.

本文言語English
ページ(範囲)755-762
ページ数8
ジャーナルHarmful Algae
4
4
DOI
出版ステータスPublished - 2005 6月
外部発表はい

ASJC Scopus subject areas

  • 水圏科学
  • 植物科学

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