Vocal repertoire and effect of advertisement call intensity on calling behaviour in the West African tree frog, Leptopelis viridis

Vocal repertoire and effect of advertisement call intensity on calling behaviour in the West... Vocal repertoire and effect of advertisement call intensity on calling behaviour in the West African tree frog, Leptopelis viridis T. Ulmar Grafe, Jan O. Steffen, Carolin Stoll Department of Animal Ecology and Tropical Biology, Biozentrum, University of Würzburg, 97074 Würzburg, Germany e-mail: grafe@biozentrum.uni-wuerzburg.de Abstract. The vocal repertoire of the West African tree frog Leptopelis viridis was investigated in the Comoé National Park, Ivory Coast. Leptopelis viridis had a complex vocal repertoire consisting of short clicks, multinote clicks, trills, and soft calls. Most calls produced were short advertisement clicks. Soft calls were emitted during agonistic interactions between males suggesting that they function as aggressive calls. In contrast, multinote calls and trills were emitted when advertisement call rate was high suggesting that these calls are used by males to increase their attractiveness to females. Even at high densities males were spaced widely with a median nearest neighbour distance of 4.8 m. We also examined the effects of increased sound level of advertisement calls on calling behaviour. Playback experiments using synthetic clicks showed that males increased the proportion of aggressive calls as the stimulus intensity was increased. Males typically responded with aggressive calls when playback levels exceeded 82 dB (re 20 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Amphibia-Reptilia Brill

Vocal repertoire and effect of advertisement call intensity on calling behaviour in the West African tree frog, Leptopelis viridis

Amphibia-Reptilia, Volume 21 (1): 13 – Jan 1, 2000

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Publisher
Brill
Copyright
© 2000 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0173-5373
eISSN
1568-5381
D.O.I.
10.1163/156853800507246
Publisher site
See Article on Publisher Site

Abstract

Vocal repertoire and effect of advertisement call intensity on calling behaviour in the West African tree frog, Leptopelis viridis T. Ulmar Grafe, Jan O. Steffen, Carolin Stoll Department of Animal Ecology and Tropical Biology, Biozentrum, University of Würzburg, 97074 Würzburg, Germany e-mail: grafe@biozentrum.uni-wuerzburg.de Abstract. The vocal repertoire of the West African tree frog Leptopelis viridis was investigated in the Comoé National Park, Ivory Coast. Leptopelis viridis had a complex vocal repertoire consisting of short clicks, multinote clicks, trills, and soft calls. Most calls produced were short advertisement clicks. Soft calls were emitted during agonistic interactions between males suggesting that they function as aggressive calls. In contrast, multinote calls and trills were emitted when advertisement call rate was high suggesting that these calls are used by males to increase their attractiveness to females. Even at high densities males were spaced widely with a median nearest neighbour distance of 4.8 m. We also examined the effects of increased sound level of advertisement calls on calling behaviour. Playback experiments using synthetic clicks showed that males increased the proportion of aggressive calls as the stimulus intensity was increased. Males typically responded with aggressive calls when playback levels exceeded 82 dB (re 20

Journal

Amphibia-ReptiliaBrill

Published: Jan 1, 2000

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