Matsuoka K
Laboratory of Coastal Environmental Sciences, Faculty of Fisheries, Nagasaki University, Japan.
Sci Total Environ. 1999 Jun 15;231(1):17-35. doi: 10.1016/s0048-9697(99)00087-x.
To investigate temporal changes of water quality, a role of dinoflagellate cysts preserved in surface sediments was examined in Yokohama Port in Tokyo Bay, Japan. Two cores were collected, and sedimentation rates and ages of both were dated as approximately 1900 years or slightly older on the basis of 210Pb and 137Cs concentrations. The temporal change in dinoflagellate cyst assemblages in the two cores reflects eutrophication in Yokohama Port in the 1960s. Abrupt increases in the cysts of Gyrodinium instriatum cysts strongly suggests that a red tide was caused by this species around 1985. Dinoflagellate cyst assemblages in surface sediments appear to be good biomarkers of changes in the water quality of enclosed seas.
为了研究水质的时间变化，在日本东京湾横滨港，对保存在表层沉积物中的甲藻孢囊的作用进行了研究。采集了两个岩芯，并根据210Pb和137Cs浓度将两者的沉积速率和年龄测定为大约1900年或稍早。两个岩芯中甲藻孢囊组合的时间变化反映了20世纪60年代横滨港的富营养化。条纹陀螺藻孢囊的突然增加强烈表明，该物种在1985年左右引发了赤潮。表层沉积物中的甲藻孢囊组合似乎是封闭海域水质变化的良好生物标志物。
