Interests in acoustic behaviour have centred on sexual behaviour in mate searching, recognition and courtship. The role of sound in more purely ecological contexts has been less widely studied. Buchvalova (Chapter 15) here discusses the possible role of grasshopper songs in the organisation of natural field assemblages and communities of insects. In interspecific interactions, particularly predator-prey and parasitoid-host interactions, sound has only occasionally been studied. The classic work of Blest (1964) on the ultrasonic calls of night flying Arctiid moths and their aposematic function against hunting insectivorous bats has stimulated much work on acoustic antipredator responses much more widely and is reviewed by Bailey (1991; and Chapter 8). The detection of sound signals by adult parasitoids during host finding is also little studied, but it is a rapidly expanding field which has been reviewed by Meyhofer and Casas (1999) and here by Casas and Magal (Chapter 20).

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