Abstract
Bladder grasshoppers are a small family of Orthoptera, with ear morphology and physiology, behavior, and sensory ecological features outstanding among acoustic insects. Acoustic communication is characterized by male and female duetting and male phonotaxis. The detection distance of the male signal is exceptional at about 2 km, achieved via stridulation against air-filled abdominal resonators, and exploitation of weather conditions ideal for sound transmission. In at least three species, alternate male morphs occur which are incapable of flight and sound production but copulate with females. Such alternative mating tactics constitute profound selective pressures for sexual competition and the evolution of the communication system. Auditory sensitivity is mediated by an array of six pairs of atympanate ears in abdominal segments A1–A6. The auditory organ, a pleural chordotonal organ, in A1 comprises about 2,000 sensilla, whereas ears in segments A2–A6 are less developed, making pneumorids a unique system for studying the evolution of complex ears from simple precursors.
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Acknowledgments
We thank the students and colleagues who collaborated on experiments in our laboratories and in the field. V. Couldridge and N. Donelson were responsible for the images of B. unicolor and B. membracioides, respectively. Research on which this chapter was based was supported by grants from the Austrian Science Foundation PO9523-BIO to HR, and the National Science Foundation 0091189 to MvS. Preparation of the chapter was supported by grant DUE 0757001 to MvS.
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Römer, H., Smith, A.R., van Staaden, M. (2014). Hearing and Sensory Ecology of Acoustic Communication in Bladder Grasshoppers. In: Hedwig, B. (eds) Insect Hearing and Acoustic Communication. Animal Signals and Communication, vol 1. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-40462-7_3
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