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Melatonin influences vocal network excitability and call duration in midshipman fish. This neurohormonal action in the midbrain may determine social context-dependent vocalizations.

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Area of Science:

  • Neuroendocrinology
  • Animal Behavior
  • Neuroscience

Background:

  • Melatonin synchronizes physiology to circadian rhythms.
  • Its role in the neural basis of social behavior, particularly vocalization, is largely unknown.
  • Midshipman fish exhibit seasonal and daily variations in vocal behavior.

Purpose of the Study:

  • To investigate melatonin's influence on the vocal network (VN) excitability in midshipman fish.
  • To determine how melatonin affects vocal call characteristics, such as duration.
  • To explore the neural mechanisms underlying social context-dependent vocalizations.

Main Methods:

  • Electrically evoked fictive calls from the vocal nerve were recorded.
  • Effects of constant light, melatonin analog (2-iodomelatonin), and melatonin receptor antagonists were examined.
  • Stimulus threshold and call duration were measured in medial and lateral midbrain sites.

Main Results:

  • Constant light increased stimulus threshold, while 2-iodomelatonin decreased it.
  • 2-iodomelatonin increased fictive call duration, with stronger effects in the lateral midbrain.
  • Melatonin receptor antagonists increased threshold and decreased duration in medial sites.

Conclusions:

  • Melatonin modulates vocal network excitability and call duration in midshipman fish.
  • Specific midbrain regions show differential sensitivity to melatonin.
  • Neurohormonal actions of melatonin likely contribute to social context-dependent vocalizations.