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Communicating male size by tremulatory vibration in a Columbian rainforest katydid, Gnathoclita sodalis (Orthoptera, Tettigoniidae)

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In the South American rainforest katydid Gnathoclita sodalis (Orthoptera, Tettigonidae), bouts of acoustic (airborne) and vibratory (substrate-borne) signals occur in the context of male agonistic interactions. We characterized the physical form for both sound and substrate signals and evaluated their role in male–male interactions. In a tournament design larger males retained sites against smaller opponents: the probability of winning was predicted by both male size and the incidence of tremulating vibrations. Substrate signaling by longbodied rainforest katydids is a widespread and important modality of communication which embraces both female attraction and male rivalry.

Affiliations: 1: Department of Biology, University of Toronto Mississauga, 3359 Mississauga Road, Mississauga, ON, Canada L5L 1C6;, Email:; 2: Evolution and Ecology Research Centre, University of New South Wales, Kensington, Sydney 2052, NSW, Australia; 3: Department of Biological Sciences, University of Lethbridge, 4401 University Drive W., Lethbridge, AB, Canada T1K 3M4


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