. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 120. 80- 40. (1st) (2nd). ORDER OF FEEDING ORDER ALONG HYDRORHIZA FIGURE 1. Stenotele activity during selective feeding of connected neighboring hydranths of//, disti- cha. Vertical bars = ± 1 standard deviation. A. Selective feeding of hydranths in order along branch. •, stenotele inactivation during feeding; O --- O, recovery following transfer to fresh medium. n = 6 for each point; r = Variation in feeding order: middle hydranth fed first, then left, then right; order of feeding is indicated, n = 3 for each point.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 120. 80- 40. (1st) (2nd). ORDER OF FEEDING ORDER ALONG HYDRORHIZA FIGURE 1. Stenotele activity during selective feeding of connected neighboring hydranths of//, disti- cha. Vertical bars = ± 1 standard deviation. A. Selective feeding of hydranths in order along branch. •, stenotele inactivation during feeding; O --- O, recovery following transfer to fresh medium. n = 6 for each point; r = Variation in feeding order: middle hydranth fed first, then left, then right; order of feeding is indicated, n = 3 for each point. inhibition. Branches of three connected hydranths were fed to inactivation, then rinsed in filtered seawater and dissected apart. The separated hydranths were then re- tested for their killing ability in individual dishes. The hydranths which had been fed first, and which originally had killed the most nauplii killed an additional ± shrimp (n = 3). The middle hydranths showed an intermediate killing response (X = ), while the last-fed hydranths (which had killed very few Anemia} killed an average of ± shrimp. Thus, all three groups showed a reversal of the inactiva- tion upon return to fresh seawater, consistent with the accumulation of inactivating factors in the original feeding solution. However, neither the second nor the third hydranths in each series killed as many total Anemia as the original number killed by first-fed hydranths. Stenotele complements of fed and unfed hydranths The effects of feeding neighboring polyps on nematocyst function indicated that the loss of nematocyst function with feeding accrued from the inactivation of nema- tocysts, rather than their depletion during feeding. To examine this possibility, we counted stenoteles in the capitate tentacles of groups of three connected hydranths, fed selectively as above. Twenty-four-hour starved hydranths served as controls. The stenoteles of capitate tentacles could be readily dist
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
