水棲生物の重金属蓄積に関する研究-III

カキの部位別銅・亜鉛蓄積について

抄録

In the previous paper, the author reported the variation of accumulated quantity of copper and zinc in the whole body of oysters which abnormally accumulated these metals after transplanted to Akamizu Inlet in Nobeoka Bay. In this paper, the author reports the variation of accumulated quantity of copper and zinc in five parts of oysters: mantles, gills, labialpalps, adductor muscle and the rest organs. The curve of abnormal accumulation of copper in the meat of oysters indicated the exponential function type and that of zinc indicated sigmoid type. Normal, abnormal, absolute abnormal and relative accumulation in the parts of oysters transplanted to Akamizu Inlet and normal oysters at Urashiro Bay are discussed here.
In the previous paper, the normal, abnormal, absolute abnormal accumulation were defined. The relative accumulation used in this paper is defined as follows: Relative accumulation refers to the relation between accumulated quantity of heavy metal in a whole body or in a part or an organ of organism, and quantity in a part or an organ of organism. Relative accumulation has three cases: 1) Tachy-accumulation that is superior to the accumulated quantity of the standard, 2) Brady-accumulation that is inferior to the standard, 3) Iso-accumulation that is equal to the standard.
Oysters which were transplanted to the water area of green oyster, are separatd into the five parts, and we have discussed on the normal, abnormal, absolute abnormal and relative accumulation of copper and zinc in each part of oysters. Obtained results are as follows:
1) Proceeding of abnormal accumulation of copper and zinc are recognized in each part of oysters. In mantles, gills and labial palps of the five parts the accumulated copper increases evidently on the contrary, in adductor muscle and the rest organs increases hardly. In labial palps increases the accumulated copper extremly.
2) It seems that the abnormal accumulation that increase continuously the quantity of copper and zinc by abnormal accumulative phenomenon, can not occur without the abilitv of normal accumulation of each part of oysters.
3) The absolute abnormal accumulation of copper is recognized in each part of oysters, but that of zinc is not recognized. Even negative values were remarked in labial palps and gills.
4) In both relative normal and abnormal accumulation, the accumulated quantities of mantles, gills and labial palps indicate the tachy-accumulation comparing with that of whole body, and that of adductor muscle and the rest organs indicate the brady-accmulation.