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- W289551806 abstract "Periodical cicadas, Magicicada septendecim and M. cassini, occupy the same habitat and the males’ singing overlaps, often forming a chorus, which in M. cassini is synchronized. The calling songs of the males differ in their sound frequency spectra and in the temporal pattern. Playback of conspecific calling songs in the field initiated singing in both species. In M. cassini the initial tick part of the song stimulated males to synchronize their songs with the chorus; the final buzz part attracted preferably females by flight phonotaxis. Auditory nerve responses showed thresholds at ca. 35 dB SPL. Only in M. septendecim, highest sensitivity of the ear matched the peak of the frequency spectrum, whereas a shift toward lower frequencies was seen in M. cassini, slightly outside the conspecific song spectrum. The temporal pattern of the song was copied at the level of single timbal actions. The auditory nerves signalled calling and courtship songs of both species. In the male, the auditory nerve responded to the male’s own sound, but with about half the latency when compared with externally produced song which points to the involvement of other mechanosensitive organs. Several interneurons were recorded and traced in the fused metathoracic-abdominal ganglion complex (MAC), which were mostly of the plurisegmental ascending types. In both species a correlation was found between the densitiy of arborizations and neuronal sensitivity. The narrower frequency tuning of the interneurons in both species indicated frequency discrimination at the ventral cord level and, at least in M. septendecim, some adaptation to distinct temporal rhythms within the song. The interneurons differed in pattern copying: in M. septendecim, they responded only to the conspecific calling and courtship songs, probably based on their rather sharp frequency tuning. Here, the most sensitive interneurons were tonically excited throughout the whole song. In M. cassini, some of the interneurons copied only the tick part, others the tick and buzz part of the song, providing the basis for sex-specific reactions of this species. In M. septendecim males a neuron was found suppressed in its response to external song when this stimulus coincided with a disturbance sound produced by the male himself. This suppression may be caused by non-auditory mechanosensitive input." @default.
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- W289551806 date "1990-01-01" @default.
- W289551806 modified "2023-09-30" @default.
- W289551806 title "Acoustic Communication in Periodical Cicadas: Neuronal Responses to Songs of Sympatric Species" @default.
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- W289551806 doi "https://doi.org/10.1007/978-3-0348-6410-7_38" @default.
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