Abstract
The raphidophyte Chattonella and the bacillariophyte Skeletonema are representative bloom-causing organisms in the Ariake Sea, Japan. Changes in their abundance were monitored to clarify the role of river discharge in the red tides caused by these organisms in the innermost area of the sea. In late June 2010, heavy rain occurred and subsequently river discharge increased. A Chattonella bloom occurred after heavy rain on July 5, although Chattonella abundance was very low (<1 cell ml−1) before the heavy rain (June 29). Maximum cell density reached 4.2 × 103 cells ml−1 at the surface. Thus, the bloom developed as the river plume extended in the estuary. During the course of extension of the river plume, the Chattonella population rapidly developed using the nutrients supplied by the river. Just after the Chattonella bloom, heavy rain occurred again and a very large quantity of river water flowed into the estuary. Consequently, the salinity of the surface decreased to 5 in the study area on July 16. Chattonella did not migrate to the surface probably because of the overlying low-salinity water; Chattonella formed a thin layer (20–50 cm in thickness) at the depth where salinity was 10. However, a Skeletonema population developed at the surface. On July 20, Skeletonema density at the surface exceeded 105 cells ml−1. With the decline of the Skeletonema abundance due to the nutrient limitation, Chattonella again formed bloom probably using deep-nutrient pool by their vertical migration behavior. The present study clearly demonstrates that the Chattonella can form dense bloom after the heavy rain. The seed population awaiting the river discharge is probably essential to the rapid development of Chattonella in the estuary.
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Acknowledgments
The authors are grateful to members of Saga Prefectural Ariake Fisheries Research and Development Centre for their assistance in field sampling. We also appreciate Prof. G. Kobayashi for his support in the experiments. This study was partly supported by a Grant-in-Aid for Scientific Research (C) (20589002) from the Japan Society for the Promotion of Science.
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Katano, T., Yoshino, K., Matsubara, T. et al. Wax and wane of Chattonella (Raphidophyceae) bloom with special reference to competition between Skeletonema (Bacillariophyceae) in the Ariake Sea, Japan. J Oceanogr 68, 497–507 (2012). https://doi.org/10.1007/s10872-012-0112-1
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DOI: https://doi.org/10.1007/s10872-012-0112-1