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Forebrain peptides modulate sexually polymorphic vocal circuitry.

J L Goodson¹, A H Bass

¹Department of Neurobiology and Behaviour, Cornell University, Ithaca, New York 14853, USA. jlg14@cornell.edu

|February 29, 2000

Summary

This summary is machine-generated.

Neuropeptides like arginine-vasotocin and isotocin influence social behaviors. In plainfin midshipman fish, vocal behavior is modulated by these peptides, with distinct patterns observed between sexes and male morphs.

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Area of Science:

Neurobiology
Behavioral Endocrinology
Comparative Physiology

Background:

Arginine-vasopressin and oxytocin regulate reproductive physiology and social behaviors in mammals.
Homologous peptides, arginine-vasotocin and isotocin, serve similar roles in non-mammals, including fish.
Sex-specific differences in neuropeptide distribution and function are common across species.

Purpose of the Study:

To investigate the role of arginine-vasotocin and isotocin in vocal-motor activity in the plainfin midshipman fish.
To determine if vocal characteristics correlate with neuropeptide function patterns, irrespective of gonadal sex.
To explore sex and morph-specific neuromodulatory mechanisms underlying reproductive behaviors.

Main Methods:

Direct delivery of arginine-vasotocin, isotocin, and their antagonists to the preoptic area-anterior hypothalamus in plainfin midshipman fish.
Recording and analysis of forebrain-evoked, rhythmic vocal-motor activity.
Comparison of neuropeptide effects across female, acoustically courting male, and sneak-spawning male morphs.

Main Results:

Arginine-vasotocin and isotocin modulated vocal-motor activity in a manner consistent with reproductive strategies.
Females and sneak-spawning males exhibited sensitivity to isotocin.
Acoustically courting males showed sensitivity to arginine-vasotocin, differing from conspecific males.
These findings suggest that vocal characteristics, not gonadal sex, predict neuropeptide function patterns.

Conclusions:

Neuromodulatory mechanisms for reproduction-related behaviors can be dissociated from gonadal sex.
Vocal characteristics in males are associated with specific patterns of neuropeptide function, aligning with females or distinct male morphs.
This study provides neurophysiological evidence for the flexible role of vasotocin-group peptides in shaping social and reproductive behaviors across sexes and morphs.