1992年に英虞湾において発生したHeterocapsa sp.赤潮発生期の環境特性とアコヤガイ斃死の特徴について
1992年に英虞湾において発生したHeterocapsa sp.赤潮発生期の環境特性とアコヤガイ斃死の特徴について
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DOI：
10.2331/suisan.61.35
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发表时间：
1995-01
影响因子：
0.4
通讯作者：
幸彦 松山;清仁 永井;忠久 水口;正巳 藤原;美佐 石村;峰生 山口;卓志 内田;凡夫 本城
中科院分区：
文献类型：
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作者：
幸彦 松山;清仁 永井;忠久 水口;正巳 藤原;美佐 石村;峰生 山口;卓志 内田;凡夫 本城
1992年夏秋两季，阿戈湾发生了大规模的甲藻赤潮。海水变色为黄褐色，最大细胞密度为87，420个/ml。夏季赤潮发生在8月中下旬，秋季赤潮发生在10月下旬至11月下旬。夏季赤潮的水温和盐度分别为23.8 - 26.9 °C和33.2 - 33.4;秋季赤潮的水温和盐度分别为16.9 - 22.2 °C和30.5 - 32.2。因此，Heterocapsa sp.可以在很宽的水温范围内形成赤潮。秋季的红潮较夏季的红潮发展缓慢。这可能部分是由于秋季水温较低。这两次红潮出现前，均曾有大雨及/或台风引起海水垂直混合。这表明，这些物理事件促进和支持该物种的生长。赤潮导致合浦珠母贝大量死亡，但并没有发现养殖鱼类和野生鱼类死亡。在赤潮期间，珍珠牡蛎紧紧地合上贝壳，尽管溶解氧浓度很高，但仍然死亡。这是首次在日本发现导致珍珠牡蛎大量死亡的赤潮。
Large-scale red tides of Heterocapsa sp. (Dinophyceae) occurred in Ago Bay during the summer and autumn of 1992. The seawater was discolored to yellow brown, and the maximum cell density was 87, 420 cells/ml. The summer red tide occurred from mid to late August, and the autumn red tide from late October to late November. Water temperatures and the salinities were 23.8 to 26.9 °C and 33.2 to 33.4 during the summer red tide, and 16.9 to 22.2 °C and 30.5 to 32.2 during the autumn red tide. Thus, Heterocapsa sp. can form red tides over a wide range of water temperature. The autumn red tide developed slowly as compared to the summer one. This may be due in part to the lower water temperature in autumn. Both red tides were preceded by heavy rainfall and/or vertical mixing of the seawater associated with a typhoon. It is suggested that these physical events promoted and supported the growth of this species. The red tides caused mass mortality of pearl oysters (Pinctada fucata); however, mortalities of cultured and feral fish were not observed. During the red tides, pearl oysters closed their shells tightly and died despite the high concentration of dissolved oxygen. This is the first report of Heterocapsa sp. red tides causing mass mortaliy of pearl oysters in Japan.