Ontogeny of sexually dimorphic ultrasonic vocalizations in Mongolian gerbils

Sexual differentiation of emission rates (Experiment 1) and physical structure of ultrasonic vocalizations (Experiment 2) were investigated in Mongolian gerbils between 17 and 85 days of age. Animals from different litters were allowed to interact in iso- and heterosexual pairs. Vocalization rates i...

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Bibliographic Details
Published inDevelopmental psychobiology Vol. 24; no. 2; p. 103
Main Authors Holman, S D, Seale, W T
Format Journal Article
LanguageEnglish
Published United States 01.03.1991
Subjects
Aging - physiology
Animals
Arousal - physiology
Female
Gerbillinae - physiology
Gonadal Steroid Hormones - physiology
Male
Sexual Maturation - physiology
Social Environment
Sound Spectrography
Ultrasonics
Vocalization, Animal - physiology
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Summary:Sexual differentiation of emission rates (Experiment 1) and physical structure of ultrasonic vocalizations (Experiment 2) were investigated in Mongolian gerbils between 17 and 85 days of age. Animals from different litters were allowed to interact in iso- and heterosexual pairs. Vocalization rates increased in all groups, reaching a plateau at approximately day 56. Female pups had significantly higher rates of all vocalizations than male pairs before the plateau stage. Five stereotypic categories of physical structure were easily distinguished and confirmed by sound spectrographic analysis. Only mid-range frequencies of vocalizations appeared to decline throughout the juveniles' lives: this change may communicate the animal's age. Two male and one female categories were sexually dimorphic and similar in structure to those made during courtship interactions. Rates of male-type vocalizations appear to increase as testicular androgens start rising.
ISSN:0012-1630
DOI:10.1002/dev.420240204