. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CU UPTAKE AND EXCRETION BY BUSYCON 320 LJ. 12 HOURS 24 OF UPTAKE 36 FIGURE 2. Uptake of dissolved, labeled Cu by gills \vith time. Points represent gills of individual whelks exposed to different initial Cu concentrations and temperatures of uptake: diagonal crosses, 6 /*g/l and 17-21° C; open circles, 9 ng/\ and 15-20° C; closed circles, 9 and 21-25° C; closed triangles, 109 \ and 15-20° C. labeled copper, with the slope decreasing with time and leveling off toward 48 hr. This is probably due to a depletion of G4Cu in t
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CU UPTAKE AND EXCRETION BY BUSYCON 320 LJ. 12 HOURS 24 OF UPTAKE 36 FIGURE 2. Uptake of dissolved, labeled Cu by gills \vith time. Points represent gills of individual whelks exposed to different initial Cu concentrations and temperatures of uptake: diagonal crosses, 6 /*g/l and 17-21° C; open circles, 9 ng/\ and 15-20° C; closed circles, 9 and 21-25° C; closed triangles, 109 \ and 15-20° C. labeled copper, with the slope decreasing with time and leveling off toward 48 hr. This is probably due to a depletion of G4Cu in the beaker; the three whelks in- cubated 48 hr had taken up 63%, 69%, and 7S% of the total labeled copper origi- nally present in the medium. The effect of copper concentration on the rate of uptake into whole animals is apparent in Figure 1. Despite the individual variation, whelks exposed to 6, 9, and 109 //,g Cu/1 generally showed the same normalized uptake in the same length of time; uptake rate was directly proportional to the concentration of copper in the medium. Yager and Harry (1964) also found increased 6lCu uptake in the freshwater snail, Taphius glabratus, when more copper was available. Localisation of copper taken up by whelks. Although the amount of labeled copper taken up into the individual tissues was small in comparison to their stable copper content, most tissues showed an accumulation of 64Cu many times its initial concentration in the incubation medium. As in whole whelks, uptake rates in individual tissues and shells were directly proportional to copper concentration, except in the case of the gill and osphradium, as noted below. Copper uptake onto the shell of Busy con followed the same general pattern as uptake by whole animals, with the normalized uptake increasing smoothly but with decreasing slope throughout the exposure period. This was not found by Yager and Harry (1964), whose measurements of G4Cu uptake from 30 solutions by Taphius
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
