. The biology of hydra and of some other coelenterates, 1961. Hydra; Cnidaria; Ctenophora; Cnidaria; Hydra. 328 THE BIOLOGY OF HYDRA : 1961 The animals represented by the filled chcles were fed every third day. These animals demonstrate that the rate of hydranth bud- ding is not significantly decreased by the lowered nutritional level but that frustule production is differentially affected. Therefore, this experiment provides direct evidence of a physiological interac- tion between medusa budding and frustule budding and further indicates that this interaction is at least partially nutritional
. The biology of hydra and of some other coelenterates, 1961. Hydra; Cnidaria; Ctenophora; Cnidaria; Hydra. 328 THE BIOLOGY OF HYDRA : 1961 The animals represented by the filled chcles were fed every third day. These animals demonstrate that the rate of hydranth bud- ding is not significantly decreased by the lowered nutritional level but that frustule production is differentially affected. Therefore, this experiment provides direct evidence of a physiological interac- tion between medusa budding and frustule budding and further indicates that this interaction is at least partially nutritional. Another experiment with different nutritional levels further illus- trates the interactions between these three morphogenetic processes. Colonies were reared at 23° from frustules taken from low tempera- ture stocks until several hydranths had been formed. These colonies were starved for approximately four weeks to deplete their nutri- tional reserves and were divided into three groups fed at different rates. As indicated in Figure 10, the production of hydranths showed 10 n/2 Daily. I Worm/ 2 Days 4 5 WEEKS Fig. 10. Colonial growth at three different feeding rates (n = the number of hydranths per colony at the time of feeding). Cultures maintained at 23° (±1°).. 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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