水棲生物の重金属蓄積に関する研究-IV
カキの異常蓄積銅・亜鉛の消失について
1968 年 34 巻 6 号 p. 482-487
詳細
1968 年 34 巻 6 号 p. 482-487
In the previous papers, the author reported the local difference in copper contents of oysters, the factors causing the difference and the process of accumulation of copper and zinc in oysters transplanted into the water area producing green oyster. In the present experiment, oysters with abnormally accumulated copper and zinc were transplanted into the water area of normal oyster and the process of disappearance of the abnormally accumulated copper and zinc in the oysters was pursued. Following were results obtained:
1) The accumulated copper does not begin to disappear until half a month or more after the transplantation, i.e. the faculty of the abnormal absorption and accumulation of copper of oysters brought by abnormal environment was kept for a period after transplantation into the normal environment.
2) The accumulated zinc begins to disappear immediately after the transplantation, showing quick adaptation of oysters to the change of environment.
3) Decreasing rate of the accumulated copper is more than twice that of zinc.
4) The quantities of these metals in individual oyster were proved to decrease in the period of the experiment, when the individual had grown four times in weight. This indicates the loss of these metals from the oyster.
5) The contents of these metals and the ratio of zinc to copper fell to the normal value of oysters in 116 days experiment.
