. The biology of hydra and of some other coelenterates, 1961. Hydra; Cnidaria; Ctenophora; Cnidaria; Hydra. LEONARD MUSCATINE 261 10 FED EVERY SECOND DAY. GREEN t ALBINO TIME IN DAYS Fig. 5. Same as Figure 4 but fed every second day. Arrow denotes time of feeding. day, green liydra deviated only slightly from normal logarithmic growth. But under the same conditions, albino hydra showed not only a more pronounced deviation, but also required more time to regain normal growth after feeding was resumed. More striking dif- ferences appeared when these two groups were fed every third day. Figure 6
. The biology of hydra and of some other coelenterates, 1961. Hydra; Cnidaria; Ctenophora; Cnidaria; Hydra. LEONARD MUSCATINE 261 10 FED EVERY SECOND DAY. GREEN t ALBINO TIME IN DAYS Fig. 5. Same as Figure 4 but fed every second day. Arrow denotes time of feeding. day, green liydra deviated only slightly from normal logarithmic growth. But under the same conditions, albino hydra showed not only a more pronounced deviation, but also required more time to regain normal growth after feeding was resumed. More striking dif- ferences appeared when these two groups were fed every third day. Figure 6 illustrates the sharp decline in rate of budding by both groups during the interval without food. But after feeding, green hydra immediately resumed a normal maximum growth rate. In contrast, growth of albinos lagged and did not return to normal. The effect of complete elimination of food is shown in Figure 7. Ten hydranths of each kind were removed from mass cultures and starved in the light in 30 ml. of M solution in Petri dishes (4" diam.). The culture medium was renewed once daily. Under these conditions, green hydra continued to produce buds for 7-9 days and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Symposium on the Physiology and Ultrastructure of Hydra and Some Other Coelenterates (1961 : Coral Gables, Fla. ); Lenhoff, Howard M; Loomis, W. Farnsworth (William Farnsworth), 1914-. Coral Gables, Fla. , University of Miami Press
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