, Volume 95, Issue 2, pp 217-220

Effect of water temperature and light intensity on growth rate and toxicity change in Protogonyaulax tamarensis

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Abstract

The effect of water temperature and light intensity on the growth rate and the toxicity of Protogonyaulax tamarensis was examined using a monoclonal culture isolated from Ofunato Bay, Japan in March, 1984. The growth rate decreased with the decrease of either light intensity or temperature. The amount of toxin produced increased concomitantly with the decrease of the growth rate. However, the increase of the toxicity under low growth rate was less remarkable when the growth rate was lowered by the decrease of light intensity. This indicates that photosynthesis plays an important role in the production of toxin in P. tamarensis.

Communicated by M. Anraku, Tokyo