@article {51475,
	title = {Wing resonances in a new dead-leaf-mimic katydid (Tettigoniidae: Pterochrozinae) from the Andean cloud forests},
	journal = {Zoologischer Anzeiger - A Journal of Comparative Zoology},
	volume = {270},
	year = {2017},
	month = {Jan-09-2017},
	pages = {60 - 70},
	abstract = {<p>Day-camouflaged leaf-mimic katydids Typophyllum spp. have a remarkable way of evading predators as male and female forewings appear as bite-damaged leaves complete with necrotic spots. As in all other katydids, males produce sound signals to attract females by rubbing their forewings together. The biophysical properties of these special leaf-like forewings remain obscure. Here we study the wing mechanics and resonances of Typophyllum spurioculis, a new species of leaf-mimic katydid with a broad distribution in the Andes from Western Ecuador to the middle Central Cordillera in Colombia. This species performs an unusual laterally directed aposematic display, showing orange spots that simulate eyes at the leg base. At night, males are conspicuous by their loud, audible calling songs, which exhibit two spectral peaks at ca. 7 and 12 kHz. Using micro-scanning laser Doppler vibrometry we find the effective sound radiators of the wings (speculae) vibrate with three modes of vibration, two of which include the frequencies observed in the calling song. Remarkably, this resonance is preserved in the parts of the wings mimicking necrotic leaves, which are in theory not specialised for sound production. The eyespot function is discussed.</p>
},
	keywords = {bush-cricket, katydid, mimetism, resonance, stridulation},
	issn = {00445231},
	doi = {10.1016/j.jcz.2017.10.001},
	url = {http://linkinghub.elsevier.com/retrieve/pii/S0044523117300748},
	author = {Baker, Andrew and Sarria-S, Fabio A. and Glenn K. Morris and Jonsson, Thorin and Montealegre-Z, Fernando}
}
@article {47329,
	title = {Wing mechanics, vibrational and acoustic communication in a new bush-cricket species of the genus Copiphora (Orthoptera: Tettigoniidae) from Colombia},
	journal = {Zoologischer Anzeiger - A Journal of Comparative Zoology},
	volume = {263},
	year = {2016},
	month = {Jan-07-2016},
	pages = {55 - 65},
	abstract = {<p>Male bush-crickets produce acoustic signals by wing stridulation to call females. Several species also alternate vibratory signals with acoustic calls for intraspecific communication, a way to reduce risk of detection by eavesdropping predators. Both modes of communication have been documented mostly in neotropical species, for example in the genus Copiphora. In this article, we studied vibratory and acoustic signals and the biophysics of wing resonance in Copiphora vigorosa, a new species from the rainforest of Colombia. Different from other Copiphora species in which the acoustic signals have been properly documented as pure tones, C. vigorosa males produce a complex modulated broadband call peaking at ca. 30 kHz. Since males of this species do rarely sing, we also report that substratum vibrations have been adopted in this species as a persistent communication channel. Wing resonances and substratum vibrations were measured using a \&mu;-scanning Laser Doppler Vibrometry. We found that the stridulatory areas of both wings exhibit a relatively broad-frequency response and the combined vibration outputs fits with the calling song spectrum breadth. The broadband calling song spectrum results from several wing resonances activated simultaneously during stridulation. Under laboratory conditions the calling song duty cycle is very low and males spend more time tremulating than singing.</p>
},
	keywords = {bioacoustics, biotremology, bush-cricket, laser Doppler vibrometer, resonance, tremulation, ultrasound},
	issn = {00445231},
	doi = {10.1016/j.jcz.2016.04.008},
	url = {http://linkinghub.elsevier.com/retrieve/pii/S0044523116300584},
	author = {Sarria-S, Fabio A. and Buxton, Kallum and Jonsson, Thorin and Fernando Montealegre-Zapata}
}
