. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. S. B. BETZER AND M. E. Q. PILSON UJ Q_ ID Q UJ M cr o. 16 20 24 28 32 HOURS OF UPTAKE 36 40 44 48 FIGURE 3. Uptake of labeled Cu by digestive gland with time. Points represent digestive glands 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 /*g/l and 15-20° C; closed circles, 9 ng/l and 21-25° C; closed triangles, 109 /tg/1 and 15-20° C. At 1 hr of uptake there are 6 points clustered at a normalized uptake of about 0. conc
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. S. B. BETZER AND M. E. Q. PILSON UJ Q_ ID Q UJ M cr o. 16 20 24 28 32 HOURS OF UPTAKE 36 40 44 48 FIGURE 3. Uptake of labeled Cu by digestive gland with time. Points represent digestive glands 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 /*g/l and 15-20° C; closed circles, 9 ng/l and 21-25° C; closed triangles, 109 /tg/1 and 15-20° C. At 1 hr of uptake there are 6 points clustered at a normalized uptake of about 0. concentration on the shell with time. In the present experiment the shell con- sistently accounted for about 30% of the total counts of the whole animal, and this copper was adsorbed on the surface. Counts of shells with a portable counter, after the whelk tissues had been dissected out, showed essentially all the activ- ity on the outside. An empty shell incubated as a control in one experiment showed the same uptake rate as the shells of live whelks, suggesting that the inner nacreous layer adsorbed little copper in comparison to the hairy, organic periostracum. Of the soft tissues, the gills (Fig. 2) and osphradium were the first to become strongly labeled. At low levels of copper in the medium, comparable to those of the environment, the gills had a normalized uptake of about 100 after 1 hr of incubation and may already have been saturated with copper. After this time the concentration in the gill showed little change, except for a possible decrease between 24 and 48 hr when the supply of labeled copper in the medium had be- come depleted. No difference in normalized uptake was distinguishable between the gills of whelks at 6 and 9 fig Cu/1; but gills of whelks at 109 fig/I showed a different pattern : not yet saturated at 1 hr, they continued to accumulate copper up to 24 hr, reaching the much higher normalized uptake of 300. The osphradium, a very small ( g), gill-
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
