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Echinoid spawning induced by a radial nerve factor.

R C Cochran, F Engelmann

    Science (New York, N.Y.)
    |October 27, 1972
    PubMed
    Summary
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    Radial nerve extracts from sea urchins trigger rapid spawning in their own species and other echinoids. This spawn-inducing factor concentration varies seasonally, linked to the reproductive cycle.

    Area of Science:

    • Marine Biology
    • Reproductive Physiology
    • Echinoderm Research

    Background:

    • Sea urchins (Strongylocentrotus purpuratus) are key marine invertebrates.
    • Understanding reproductive triggers is crucial for aquaculture and conservation.
    • Radial nerves are implicated in echinoderm reproductive processes.

    Purpose of the Study:

    • To investigate the spawn-inducing properties of radial nerve extracts in sea urchins.
    • To determine the effect of these extracts on different echinoderm species.
    • To analyze the seasonal variation of the spawn-inducing factor.

    Main Methods:

    • Extraction of radial nerves from Strongylocentrotus purpuratus.
    • Administration of extracts to various echinoid and asteroid species.

    Related Experiment Videos

  • Observation and timing of induced spawning events.
  • Annual monitoring of radial nerve extract concentration.

    • Main Results:

    • Radial nerve extract induced spawning within 1 minute in Strongylocentrotus purpuratus and other echinoids.
    • Delayed spawning was observed in several asteroid species.
    • The concentration of the spawn-inducing factor showed annual fluctuations.
    • These fluctuations correlated with the reproductive season along the southern California coast.

    Conclusions:

    • Radial nerve extracts contain a potent spawn-inducing factor for echinoids.
    • The factor's seasonal variation suggests a role in natural reproductive cycles.
    • This finding has implications for controlling reproduction in marine invertebrates.