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Digestive cell and tentacle number in freshly detached buds of hydra viridis



Digestive cell and tentacle number in freshly detached buds of hydra viridis



International Journal of Invertebrate Reproduction 1(3): 167-178



Buds were collected from hydras fed 4 days a week on different schedules. Independent of schedule, parents produced the same number of buds/week, but significant differences appeared in the number of buds detaching on particular days and in the number of digestive cells present in the buds. Groups of buds collected from parents fed the same number of days (from 1-3) during the previous 4 days, contained statistically indistinguishable numbers of digestive cells despite the order or sequence of days on which feedings occurred. The number of digestive cells in all the freshly detached buds collected here can be accounted for by the growth of a bud primordium over a 4 day period of bud development and growth. Such a primordium would have about 3600 digestive cells and grow at the rate of 0.33 cells/cell per day of feeding. The numbers of tentacles found on freshly detached buds are correlated with the number of feeding days and digestive cells present in the bud. Tentacles may also form from primordia consisting originally of a specific number of cells.

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Accession: 005161646

Download citation: RISBibTeXText

DOI: 10.1080/01651269.1979.10553311



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