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Related Experiment Videos

Complex behavior induced by egg-laying hormone in Aplysia

S M Bernheim1, E Mayeri

  • 1Department of Physiology, University of California, San Francisco 94143-0444.

Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology
|January 1, 1995
PubMed
Summary

Egg laying hormone (ELH) in the marine mollusc Aplysia triggers a complex egg-laying behavior. This study confirms ELH

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Area of Science:

  • Neurobiology
  • Marine Biology
  • Animal Behavior

Background:

  • The marine mollusc Aplysia exhibits complex behaviors during egg laying.
  • Egg laying is initiated by neuroendocrine bag cells in the abdominal ganglion or by bag cell extract injection.

Purpose of the Study:

  • To precisely identify factors inducing egg-laying behavior in Aplysia.
  • To investigate the role of egg laying hormone (ELH) in regulating this behavior.

Main Methods:

  • Injection of egg laying hormone (ELH) into Aplysia.
  • Observation and analysis of behavioral patterns following ELH injection.
  • Injection of atrial gland homogenate as a comparison.
  • Control group injections for baseline comparison.

Main Results:

  • ELH injection induced a behavior pattern similar to spontaneous egg laying.
  • Observed behaviors included specific head movements, inhibition of locomotion, and decreased respiratory pumping.
  • Atrial gland homogenate induced similar behaviors, excluding respiratory pumping changes.
  • Control injections did not elicit these specific behaviors.

Conclusions:

  • Egg laying hormone (ELH) is strongly implicated in the regulation of Aplysia egg-laying behavior.
  • The findings support ELH's role in controlling the observed behavioral sequence.
  • Further research is needed to explore ELH's sites of action and neural control mechanisms.

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