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Vocalization of the silvery mole-rat: comparison of vocal repertoires in subterranean rodents with different social systems

Ema Knotková, Silke Veitl, Radim Šumbera, František Sedlácek & Hynek Burda (2009). Vocalization of the silvery mole-rat: comparison of vocal repertoires in subterranean rodents with different social systems. Bioacoustics, Volume 18 (3): 241 -257

 

Abstract: 

We examined vocalisations of a solitary subterranean rodent, the Silvery Mole-rat Heliophobius argenteocinereus (Bathyergidae). Seven true vocalisations and one mechanical vocalisation were identified. The main frequencies of the analysed sounds (0.34-13.17 kHz) match to a great extent the frequency range suitable for transmission in underground burrows. Due to the narrow frequency range of vocalisations, motivation is predominantly expressed by the rate of tonality rather than by frequency changes.  The vocal repertoire of the Silvery Mole-rat perfectly matches to Morton's MS rules, i.e. that low-frequency and harsh vocalisations indicate hostility whereas high tonal calls signalize appeasement or fear. In comparison with social species, this solitary bathyergid produces fewer calls. It lacks contact and alarm calls, but has a rich repertoire of mating calls (mating ends with duet vocalization of male and female). Acoustic signals seem to play a major role in lowering natural aggressiveness during the mating period.

Keywords: 

Silvery mole-rat, Bathyergidae, vocal communication, Heliophobius argenteocinereus, MS rules, sociality

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