. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 322 L. MUSCATINE AM) II. M. ; tentacles \vas first noticed. Goetsch also observed the disintegration of starving albinos in contrast to the gradual diminution of similarly treated green hydra. From the data on starvation in Table II, it was possible to estimate the degree to which the number of algae influenced survival. In Figure 4 the percentage of algae contained initially by the hydra in each group is plotted against (1) the average number of hydranths present at 12 days starvation, and (2) the range of maximu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 322 L. MUSCATINE AM) II. M. ; tentacles \vas first noticed. Goetsch also observed the disintegration of starving albinos in contrast to the gradual diminution of similarly treated green hydra. From the data on starvation in Table II, it was possible to estimate the degree to which the number of algae influenced survival. In Figure 4 the percentage of algae contained initially by the hydra in each group is plotted against (1) the average number of hydranths present at 12 days starvation, and (2) the range of maximum survival times. In the first curve, 12 days was chosen because it repre- sents the time at which no albinos remain, although data from 8-14 days give curves of essentially the same character. The shape of the resulting curves is interpreted to mean that survival ability of a starved C. viridissima is not appreciably impaired. 0 20 40 60 80 % PHOTOSYNTHETICALLY-ACTIVE ALGAE 100 FIGURE 4. Survival of starved C. viridissima as a function of the number of algae contained. Using data from Table III, the per cent of photosynthetically-active plant material is plotted against the number of hydranths present after 12 days' starvation (open circles) and mean survival (open squares). until the level of its photosynthetically-active plant material drops below 15-20% of its normal value. Thus, only about 5-10% of the normal algal flora appears necessary for half-maximum survival ability of the starving host. 3. The effect of starvation on turnover of S35-Iabelcd food To compare the turnover of protein by starving green and albino C. viridissima, we measured the rate at which radioactivity was released into the medium by hydra which had previously ingested S35-labeled mouse liver. Duplicate groups of 10 green, 20 albino, and 10 "pale green" (15% algae) hydra were fed sulfur-labeled liver and allowed to regurgitate the uneaten portion 6 hours later. Immediately after regurgitatio
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
