Vocal Communication Mechanisms in Anuran Species

Anuran species—frogs and toads—employ a sophisticated suite of vocal behaviours to mediate mate attraction, territorial defence and species recognition. Sound production arises from the coordinated action of pulmonary airflow and laryngeal structures, where specialised vocal cords and resonance chambers shape frequency and temporal patterns. The biomechanical properties of the larynx, including elastic cartilages and muscle control, determine call amplitude, pitch and modulation. Concurrently, the central nervous system orchestrates vocal pattern generation through dedicated neural circuits known as central pattern generators. These circuits integrate sensory feedback, hormonal state and neuromodulatory inputs to produce species-typical call sequences. Receivers decode these signals via auditory filtering mechanisms that emphasise conspecific call parameters against environmental noise. Evolution has fine-tuned call structure to local acoustic habitats, promoting reproductive isolation and adaptive radiations across diverse ecological regions. Research into anuran vocal communication has illuminated fundamental principles of motor pattern generation, signal evolution and the interplay between peripheral biomechanics and central control, with implications for understanding vertebrate acoustic signalling more broadly.

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Vocal Communication Mechanisms in Anuran Species publication trend

The graph below shows the total number of articles in vocal communication mechanisms in anuran species across all publications each year (not limited to Nature Index journals).

Technical terms

Anura: The taxonomic order comprising frogs and toads, characterised by vocal communication through lung‐driven sound production.

Laryngeal resonance: The amplification and tuning of vocal signals by elastic cartilages and air chambers within the larynx.

Central pattern generator (CPG): A neural network that produces rhythmic motor patterns, such as calls, without requiring rhythmic sensory input.

Dyads: Two simultaneous resonance frequencies generated by laryngeal structures, serving as acoustic identifiers within species or clades.

Fictive vocalisation: Neural activity patterns and muscle commands recorded in an isolated preparation that mimic natural calls in the absence of sound output.

References

1. The return to water in ancestral Xenopus was accompanied by a novel mechanism for producing and shaping vocal signals. eLife (2019).
2. Development of an Acute Method to Deliver Transgenes Into the Brains of Adult Xenopus laevis. Frontiers in Neural Circuits (2018).