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Adaptation du sonar de la Barbastelle Barbastella barbastellus à la capture de Papillons tympanés : un cas de mimétisme acoustique trompeur ?

Auteur : Barataud (Michel)


Année de publication : 2011
Publication : Vespere
Volume : 2
Pagination : 95-105


Résumé :

pplyBrkRulesBarbastelle's diet consists almost exclusively of small moths, which are/ often tympanate. other bat species with a similar diet have developed/ acoustic adaptations against their prey escape strategies, such as/ allotonic frequencies and whispering emissions. Barbastelle emits/ several kinds of sonar signal which are linked to its flight environment/ or its behaviour. Amongst the sonar types used, the most frequent,/ so-called ialternation typei, remains remarkably constant despite of the/ variation of the environmental conditions, a fact which is not congruent/ with the theoretical model. This paper provides support for the/ hypothesis that Barbastelle sonar, with frequency and intensity/ alternation, is adapted to counteract the escape reaction of a tympanate/ prey. Basic principle would be acoustic mimicry, with Barbastelles/ hunting calls resembling the inoffensive acoustic environment of their/ preys. This adaptation appears successful because Barbastelles diet is/ the most specialised amongst European bats.