シガテラの毒化原因鞭毛藻の生育環境に関する研究〔英文〕

概要

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Population assays and analyses of sea water were conducted simultaneously at various placs of French Polynesia to investigate environmental factors affecting the distribution and population of Gambierdiscus toxicus. The population of the organism was low at Tahiti Moorea and Bora Bora islands but was extremely high at the Gambier islands. Thus the ciguateric of the surveyed area was well explainable by the abundance of the organism. Nutrients such as the inorganic phosphorus, total phosphorus, nitrite, nitrate, silicate, iron, dissolved organic carbon, and vitamin B12 showed little correlation with the population of G. toxicu. The benthic community consisting of corals, macroalgae and benthic microalgae such as diatoms and dinoflagellates seemed to play an important role in regulating the population of the toxic dinoflagellate.