Sexual dimorphism and testosterone responsiveness in hypaxial muscles of the northern leopard frog, Rana pipiens

AbstractAbdominal hypaxial muscles of male anurans function in vocalization by causing forcible expulsion of pulmonary air through the larynx. The hypaxial muscles were studied in the leopard frog, Rana pipiens, to test whether functions of these muscles in males are reflected in sexual dimorphism a...

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Bibliographic Details
Published in:Amphibia-reptilia 1998, Vol.19 (3), p.269-279
Main Authors: Blackburn, Daniel G, Bernardo, Vincent A
Format: Article
Language:English
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Summary:AbstractAbdominal hypaxial muscles of male anurans function in vocalization by causing forcible expulsion of pulmonary air through the larynx. The hypaxial muscles were studied in the leopard frog, Rana pipiens, to test whether functions of these muscles in males are reflected in sexual dimorphism and in androgen responsiveness. The combined abdominal oblique muscles and the rectus abdominis showed significant sexual dimorphism in wet mass and dry mass. However, the abdominal oblique muscles were less concentrated in protein content in males than in females. In overwintering males, exogenous testosterone cypionate stimulated a significant increase in mass and protein content of the abdominal oblique and rectus abdominis muscles. Castration had no effect on muscle mass or on the response to androgen treatment.
ISSN:0173-5373
1568-5381
DOI:10.1163/156853898X00179