Project 2686: Tobias Riede, Heather L. Borgard, Bret Pasch. 2017. Laryngeal airway reconstruction indicates rodent ultrasonic vocalizations are produced by an edge tone mechanism. Royal Society Open Science. 4:170976.
Specimen: Onychomys arenicola (MWU:Male, A06-01)
View: Thyroid cartilage, multiple views

Abstract

Some rodents produce ultrasonic vocalizations (USVs) for social communication using an aerodynamic whistle, a unique vocal production mechanism not found in other animals. The functional anatomy and evolution of this sound production mechanism remains unclear. Using laryngeal airway reconstruction, we identified anatomical specializations critical for USV production. A robust laryngeal cartilaginous framework supports a narrow supraglottal airway. An intralaryngeal airsac-like cavity termed the ventral pouch was present in three muroid rodents (suborder Myomorpha), but was absent in a heteromyid rodent (suborder Castorimorpha) that produces a very small vocal repertoire without USVs. Small lesions to the ventral pouch in laboratory rats caused dramatic changes to USV production supporting the hypothesis that an interaction between a glottal exit jet and the alar edge generates ultrasonic signals in rodents. The resulting undulating air flow around the alar edge interacts with the resonance of the ventral pouch, which may function as Helmholtz resonator. The proposed edge-tone mechanism requires control of intrinsic laryngeal muscles and sets the foundation for acoustic variation and diversification among rodents. Our work highlights the importance of anatomical innovations in the evolution of animal sound production mechanisms.


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Article DOI: 10.1098/rsos.170976

Project DOI: 10.7934/P2686, http://dx.doi.org/10.7934/P2686
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    Authors' Institutions

    • Midwestern University

    • Northern Arizona University



    Members

    member name taxa specimens media
    Tobias Riede
    Project Administrator
    Last logged in 11/01/17
    72299
    Bret Pasch
    Full membership
    Last logged in 10/03/17
    000


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