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Conduction system in a sponge

I D Lawn, G O Mackie, G Silver

    Science (New York, N.Y.)
    |March 13, 1981
    PubMed
    Summary
    This summary is machine-generated.

    The sponge Rhabdocalyptus dawsoni can stop its water current using a nervous system. This response travels at 0.22 cm/s, showing coordinated electrical signaling in sponges.

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    Area of Science:

    • Marine Biology
    • Invertebrate Zoology
    • Neurobiology

    Background:

    • Hexactinellid sponges, like Rhabdocalyptus dawsoni, are complex filter feeders.
    • Understanding their physiological responses is key to marine invertebrate biology.

    Purpose of the Study:

    • To investigate the mechanism of exhalant water current arrest in Rhabdocalyptus dawsoni.
    • To characterize the electrical properties of the sponge's conduction system.

    Main Methods:

    • Mechanical and electrical stimuli were applied to the sponge.
    • The arrest response and its propagation were measured.
    • Excitability threshold and chronaxie were determined.

    Main Results:

    • Rhabdocalyptus dawsoni demonstrated the ability to arrest its exhalant water current.

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  • A conduction system with a threshold and 38 ms chronaxie was identified.
  • The response propagated at 0.22 cm/s with unpolarized conduction.

    • Conclusions:

    • The sponge possesses a coordinated conduction system for physiological responses.
    • This study reveals sophisticated electrical signaling capabilities in sponges.
    • Findings contribute to the understanding of primitive nervous systems.