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Journal of Plankton Research Vol.24 no.1 pp.33-47, 2002
© Oxford University Press 2002

Modelling the population dynamics of the toxic dinoflagellate Alexandrium Tamarense in Hiroshima Bay, Japan

Tamiji Yamamoto, Takayoshi Seike, Toshiya Hashimoto and Kenji Tarutani

Faculty of Applied Biological Sciences, Hiroshima University, Higashi-Hiroshima 739-8528, Japan

Corresponding author: T. Yamamoto. e-mail: tamyama{at}hiroshima-u.ac.jp

In the present study, a numerical model that simulates species competition between the toxic dinoflagellate Alexandrium tamarense and the non-toxic diatom Skeletonema costatum was constructed using data from a number of experiments and field observations. In the model, not only vertical migration of swimming cells but also the encystment and excystment processes of A. tamarense were taken into consideration. Sinking of S. costatum cells was also considered. Both zooplankton and oysters, which are intensively cultured in this bay, feed on the phytoplankton but the contribution of grazing to the decrease in the cell densities of both species was small. The model predicts that while sinking is one of the major processes that reduce the cell density of S. costatum, encystment of A. tamarense is a crucial process that determines the cessation of blooms of this dinoflagellate. Advection and diffusion are also important physical processes that affect, in positive and negative ways, the fluctuation of cell densities.


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Related articles in Journal of Plankton Research:

Modelling the population dynamics of the toxic dinoflagellate Alexandrium tamarense in Hiroshima Bay, Japan. II. Sensitivity to physical and biological parameters
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