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Developmental constraint of insect audition.

Reinhard Lakes-Harlan1, Johannes Strauss

  • 1Justus-Liebig Universität Giessen, Institute for Animal Physiology, Integrative Sensory Physiology, Germany. Reinhard.Lakes-Harlan@uni-giessen.de

Frontiers in Zoology
|December 14, 2006
PubMed
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Developmental constraints shape insect ears. Larval cicada auditory organs may function as vibration receivers, influencing adult sensory cell numbers and evolution.

Area of Science:

  • Auditory neurobiology
  • Developmental biology
  • Evolutionary biology

Background:

  • Insect auditory organs exhibit significant variation in sensory cell numbers, from single cells to thousands.
  • The large number of sensory cells in cicadas remains functionally unexplained.
  • Developmental pathways for insect auditory organs differ across insect orders, suggesting stage-specific sensory cell functions.

Purpose of the Study:

  • To propose that functional demands on subadult stages dictate the adult sensory unit count in cicada auditory systems.
  • To hypothesize that larval auditory organs function as vibration receivers, a concept termed functional caenogenesis.

Main Methods:

  • Detailed neuroanatomical analysis of the larval auditory sense organ.
  • Neurophysiological and behavioral experiments to determine larval auditory organ function.

Related Experiment Videos

  • Investigation into sensory cell persistence and auditory organ regeneration from larval to adult stages.

    • Main Results:

    • Analysis of larval auditory organ neuroanatomy.
    • Neurophysiological and behavioral data on larval vibration reception.
    • Evidence of sensory cell persistence and organ remodeling during postembryonic development.

    Conclusions:

    • The evolution of insect ears should consider developmental processes, not solely adult sound perception mechanisms.
    • Functional requirements during postembryonic development can impose constraints on the evolution of adult sensory organs.
    • The cicada auditory system serves as a model for how developmental constraints influence the evolution of adult sensory systems.