Hormone-induced vocal behavior and midbrain auditory sensitivity in the green treefrog,Hyla cinerea |
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Authors: | Mario Penna Robert R Capranica Jane Somers |
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Institution: | (1) Section of Neurobiology and Behavior, Cornell University, 14853 Ithaca, New York, USA;(2) Present address: Department of Physiology and Biophysics, Faculty of Medicine, University of Chile, Casilla 70005 Correo 7, Santiago, Chile |
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Abstract: | Summary Twenty four castrated male, 6 intact male, and 11 intact female Hyla cinerea were injected subcutaneously with 25 g arginine-vasotocin (AVT) and induced to call 1 h later in response to the playback of a conspecific mating call. Eighteen castrated males and 8 intact females were implanted 5 mg androgen pellets for 3 weeks prior to the neuropeptide injection. Among castrated males, 6/9 testosterone (T) implanted, 4/9 dihydrotestosterone (DHT) implanted and 2/6 non implanted individuals produced calls after being administered AVT. 5/6 intact non implanted males and 6/8 T intact implanted females also called, and 3 intact non implanted females remained silent after the injection. Evoked calls had a mid-frequency spectral peak at about 1900 Hz which is absent in field-recorded mating calls of this species. Calls of implanted females and castrated non implanted males were shorter than those of castrated implanted and intact non implanted males. Audiograms measured before hormone implants showed dips of enhanced sensitivity at about 0.5, 0.9 and 3.0 kHz in males and females. After AVT injection, thresholds at frequencies within the 0.7–1.5 kHz range were increased in castrated males. Such reduction in sensitivity points to an inhibition of the auditory system during hormone induced vocal activation.Abbreviations
AVT
arginine-vasotocin
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DHT
dihydrotestosterone
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T
testosterone
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TS
torus semicircularis |
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Keywords: | Androgens Argine-vasotocin Auditory sensitivity Torus semicircularis Treefrogs Vocal behavior |
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