Kim D, Sato Y, Oda T, Muramatsu T, Matsuyama Y, Honjo T
Division of Biochemistry, Faculty of Fisheries, Nagasaki University, Japan.
Biosci Biotechnol Biochem. 2000 Dec;64(12):2719-22. doi: 10.1271/bbb.64.2719.
Heterocapsa circularisquama (Dinophyceae), a noxious red tide dinoflagellate, is known to have a specifically lethal effect on shellfish, especially bivalves such as pearl oyster (Pinctada fucata), but no detrimental effects of this alga on fishes have not been observed so far. In this study, we found that H. circularisquama was toxic to a microzooplankton, a rotifer (Brachionus plicatilis) in a cell concentration-dependent manner, while the cultured supernatant or ultrasonic ruptured H. circularisquama had no significant toxic effect on the rotifer. Since no such toxic effects on the rotifer were observed in Chattonella marina, Heterosigma akashiwo, or Cochlodinium polykrikoides, other species of harmful red tide plankton, H. circularisquama may have a strictly specific toxic mechanism against the rotifer as well as bivalves.
圆形异帽藻（甲藻纲）是一种有害的赤潮甲藻，已知其对贝类具有特异性致死作用，尤其是对双壳贝类，如珍珠贝（马氏珠母贝），但迄今为止尚未观察到这种藻类对鱼类有不利影响。在本研究中，我们发现圆形异帽藻对一种微型浮游动物——褶皱臂尾轮虫具有细胞浓度依赖性毒性，而培养上清液或超声破碎的圆形异帽藻对轮虫没有显著毒性作用。由于在海洋褐胞藻、赤潮异弯藻或多环旋沟藻等其他有害赤潮浮游生物物种中未观察到对轮虫的此类毒性作用，圆形异帽藻可能对轮虫以及双壳贝类具有严格的特异性毒性机制。
