. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 238 G. ROESIJADI 220 180 140 100 60 Na. JL 20 40 60 80 100 DRY GILL 120 140 160 FIGURE 3. Sodium and potassium content of gills following 30-day exposure to control, 7, 18, or 39 Mg/1 total copper in sea water. Gill ion concentrations are plotted against the gill copper cencentrations of Figure 2. Mean ± 1 standard error. increased lysosomal activity. Mortalities precluded measurements for clams at higher exposures of copper. Copper concentrations in other organs (Table I) were not directly correlated with the exposure coppe
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 238 G. ROESIJADI 220 180 140 100 60 Na. JL 20 40 60 80 100 DRY GILL 120 140 160 FIGURE 3. Sodium and potassium content of gills following 30-day exposure to control, 7, 18, or 39 Mg/1 total copper in sea water. Gill ion concentrations are plotted against the gill copper cencentrations of Figure 2. Mean ± 1 standard error. increased lysosomal activity. Mortalities precluded measurements for clams at higher exposures of copper. Copper concentrations in other organs (Table I) were not directly correlated with the exposure copper concentration in the manner described above for gills. Muscle and viscera copper concentrations reached an apparent maximum at the 7 exposure. Kidneys exhibited an increase to 111 jag copper/g dry weight at the 7 /Ag/1 exposure and a decline to /xg/g at the 18 /xg/l exposure. Although the significance of the high kidney copper concentration at 7 /Ag/1 is not under- stood, the possibility of copper contamination can be discounted as the analyses have been repeated on separate kidney samples with similar results. Whole animal copper concentrations exhibited a pattern similar to that described for muscle and viscera. The importance of examining individual tissues or organs for metals content is indicated by the results, since patterns present in small organs such as gills or kidneys were not reflected in whole animal preparations. Gel chromatography of the soluble extracts of clam tissues from the control, 7 and 18 /xg/1 treatments indicated the presence of low molecular weight, metal- binding proteins in copper-exposed, as well as control, clams. However, it appears TABLE I Concentrations of copper (Mean ± 1 standard error ng/g dry weight, n = 5) in various organs of Protothaca staminea following exposure for 30 days to total copper levels indicated below. Body component Control 7/ig/l I8Mg/l Gill ± ± ± Muscle ± ± 3
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