The seasonal occurrence of Alexandrium tamarense (Dinophyceae) vegetative cells in Hiroshima Bay, Japan.

• ITAKURA SHIGERU

  Harmful Phytoplankton Section, Harmful Algal Bloom Division, National Research Institute of Fisheries and Environment of Inland Sea

• YAMAGUCHI MINEO

  Harmful Phytoplankton Section, Harmful Algal Bloom Division, National Research Institute of Fisheries and Environment of Inland Sea

• YOSHIDA MAKOTO

  Faculty of Fisheries, Nagasaki University

• FUKUYO YASUWO

  Asian Natural Environmental Science Center, The University of Tokyo

抄録

The seasonal bloom of the toxic dinoflagellate Alexandrium tamarense, with reference to the ambient oceanographic conditions in Hiroshima Bay, Seto Inland Sea, Japan is described. Long-term observations on the vegetative cells of A. tamarense were conducted biweekly to monthly at one fixed station in northern Hiroshima Bay, where recurrent paralytic shellfish poisoning (PSP) incidents have been occurring since 1992. Over the 5-year study period, from April 1994 to December 1998, vegetative cells of A. tamarense were detected each year within the period from January to June. Observed annual maximum cell densities of A. tamarense reached 10³-10⁴ cells/L, and mostly peaked at a depth layer of 5 m at the sampling station in April or May. Oceanographic conditions during the bloom period were as follows: water temperatures ranged from 10.2°C to 20.2°C, and thermal stratification gradually developed around April. Inorganic nutrient concentrations were markedly low throughout the bloom period. Particularly, the annual lowermost concentration of SiO₂-Si was observed each year during this period. These environmental features indicate that the occurrence of vegetative cells of A. tamarense seems to be explained by temperature and nutrient conditions and that the A. tamarense bloom developed subsequently to or concomitantly with the diatom spring bloom.

収録刊行物

• Ｆｉｓｈｅｒｉｅｓ　ｓｃｉｅｎｃｅ

  Ｆｉｓｈｅｒｉｅｓ　ｓｃｉｅｎｃｅ 68 (1), 77-86, 2002

  公益社団法人 日本水産学会

キーワード

• Alexandrium tamarense
• bloom
• environmental condition
• Hiroshima Bay
• population dynamics
• seasonal occurrence
• vegetative cells

詳細情報

• CRID: 1390282679405410432
• NII論文ID: 130003742415
• NII論文ID: 10008272200
• NII書誌ID: AA10993718
• DOI: 10.1046/j.1444-2906.2002.00392.x
• COI: 1:CAS:528:DC%2BD38Xis1OitL8%3D
• ISSN: 14442906
• ISSN: 09199268
• NDL書誌ID: 6060318
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6060318
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可