Advertisement

Hydrobiologia

, Volume 530, Issue 1–3, pp 155–162 | Cite as

Primary inhibition: a mechanism for sudden stoppage of metachrony in ctenophores

  • Anthony G. Moss
Article
  • 80 Downloads

Abstract

The ctenophores Beroë cucumis and Pleurobrachia pileus exhibit rapid stoppage of comb plate beating, without accompanying muscular contraction, in response to an orally applied mechanical stimulus. This phenomenon, termed ‘primary inhibition’ by Göthlin, was re-examined by high-speed video microscopy and intracellular recording. The most remarkable features of this event were that (1) inhibition was associated with only one or two comb plates in the row, (2) inhibition occurred nearly anywhere in the ciliary beat cycle, (3) the inhibited plate acted as a mechanical blockade to the propagation of additional metachronal waves, and (4) a single depolarizing post-synaptic potential occurred nearly simultaneously with comb plate inhibition. B. cucumis and P. pileus have evolved a neurally controlled behavior to rapidly stop comb plate metachrony.

Keywords

Comb plate cilia metachrony neurociliary regulation Beroë cucumis Pleurobrachia pileus 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Barlow, D., Sleigh, M. A., White, R. J. 1993Water flows around the comb plates of the ctenophore Pleurobrachia plotted by computer: a model system for studying propulsion by antiplectic metachronismJournal of Experimental Biology177113128Google Scholar
  2. Cowan, J.H.,Jr, Houde, E.D. 1993Relative predation potentials of scyphomedusae, ctenophores and planktivorous fish on ichthyoplankton in Chesapeake BayMarine Ecology Progress Series955565CrossRefGoogle Scholar
  3. Göthlin, G. 1920Experimental studies on primary inhibition of the ciliary movement in Beroë cucumisJournal of Experimental Biology31403441Google Scholar
  4. Hernandez-Nicaise, M.L. 1973The nervous system of ctenophores. III. Ultrastructure of synapsesJournal of Neurocytology2249263CrossRefPubMedGoogle Scholar
  5. Hernandez-Nicaise, M.L. 1974Système nerveux et integration chez les cténaires. Étude ultrastructurale et compartementale. ThesisUniv. Claude BernardLyon, FranceGoogle Scholar
  6. Horridge, G. A., 1966. Pathways of coordination in ctenophores. In Rees, W. J. (ed.),’ The Cnidaria and their Evolution”. Zoological Society of London Symposium 16: 247–266.Google Scholar
  7. Horridge, G.A., Mackay, B. 1964Neurociliary synapses in Pleurobrachia (Ctenophora)Quarterly Journal of Microscopical Science105163174Google Scholar
  8. Mackie, G.O., Mills, C.E., Singla, C.L. 1992Giant axons and escape swimming in Euplokamis dunlapae (Ctenophora: Cydippida)Biological Bulletin182248256CrossRefGoogle Scholar
  9. Moss, A.G., Tamm, S.L. 1986Electrophysiological control of ciliary motor responses in the ctenophore PleurobrachiaJournal of Comparative Physiology158311330PubMedCrossRefGoogle Scholar
  10. Moss, A.G., Tamm, S.L. 1987A calcium regenerative potential controlling ciliary reversal is propagated along the length of ctenophore comb platesProceedings of the National Academy of Sciences8464766480CrossRefGoogle Scholar
  11. Moss, A.G., Tamm, S.L. 1993Patterns of electrical activity in comb plates of feeding Pleurobrachia (Ctenophora)Philosophical Transactions of the Royal Society, London series B339116CrossRefGoogle Scholar
  12. Nakamura, S., Tamm, S.L. 1985Calcium control of ciliary reversal in ionophore-treated and ATP-reactivated comb plates of ctenophoresJournal of Cell Biology10014471454CrossRefPubMedGoogle Scholar
  13. Purcell, J.E. 1985Predation on fish eggs and larvae by pelagic cnidarians and ctenophoresBulletin of Marine Science37739755Google Scholar
  14. Purcell, J.E., Arai, M.N. 2001Interactions of pelagic cnidarians and ctenophores with fish: a reviewHydrobiologia4512744CrossRefGoogle Scholar
  15. Tamm, S.L. 1973Mechanisms of ciliary coordination in ctenophoresJournal of Experimental Biology59231245Google Scholar
  16. Tamm, S. L., 1982. Ctenophora. In Shelton, G. A. B. (ed.), ‘Electrical Conduction and Behavior in ‘Simple’ Invertebrates’. Oxford: 266–358. Google Scholar
  17. Tamm, S.L. 1994Ca2+ channels and signaling in cilia and flagellaTrends in Cell Biology4305310CrossRefPubMedGoogle Scholar
  18. Tamm, S.L., Moss, A.G. 1985Unilateral ciliary reversal and motor responses during prey capture by the ctenophore PleurobrachiaJournal of Experimental Biology114443461PubMedGoogle Scholar
  19. Tamm, S.L., Tamm, S. 1981Ciliary reversal without rotation of axonemal structures in ctenophore comb platesJournal of Cell Biology89495509CrossRefPubMedGoogle Scholar
  20. Tamm, S., Tamm, S.L. 1995A giant nerve net with multi-effector synapses underlying epithelial adhesive strips in the mouth of Beroë (Ctenophora)Journal of Neurocytology24711723CrossRefPubMedGoogle Scholar
  21. Tamm, S.L., Tamm, S. 2002Novel bridge of axon-like processes of epithelial cells in the aboral sense organ of ctenophoresJournal of Morphology25499120CrossRefPubMedGoogle Scholar

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  1. 1.Biological SciencesAuburn UniversityAuburnUSA

Personalised recommendations