PREDICTIONS AND CHARACTERISTICS OF <i>CHATTONELLA</i> AND DIATOM RED TIDE BLOOM CESSATION DURING SUMMER IN ISAHAYA BAY

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  • 諫早湾における夏季に発生する<i>Chattonella</i>および珪藻赤潮の生態特性と終息時期の予測
  • 諫早湾における夏季に発生するChattonellaおよび珪藻赤潮の生態特性と終息時期の予測
  • イサハヤワン ニ オケル カキ ニ ハッセイ スル Chattonella オヨビ ケイソウ アカシオ ノ セイタイ トクセイ ト シュウソク ジキ ノ ヨソク

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Abstract

 Using sequential data including chlorophyll-a (chl-a) and sea water density observed by Japan's Ministry of Agriculture, Forestry and Fisheries, we tried to characterize the ecological properties of Chattonella and diatom red tides occurring in Isahaya Bay during the summer and to find indices for prediction of these red tides cessations. Chattonella red tides grew with repeated diel vertical migrations observed moving beyond halocline levels and settling down at the sea bottom in cessation periods. On the other hand diatom red tides grew in the upper layers before it started to fall at the middle period, then it reached full bloom and ceased growth at the bottom layer. Moreover, it was observed that a dominant index of diatoms' cessation was settling clusters which started at the time when the difference of sea water density between upper and lower layers was rather large, unlike Chattonella red tides which were small. Additionally, the velocities of diel vertical migrations of Chattonella and those of settling clusters of diatoms were estimated numerically.

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