Sound design for vocalizations: Quality in the woods, consistency in the fields

Article Abstract:

The acoustic adaptation hypothesis (AAH) proposed that acoustic signals are formed in such a way as to maximize their performance under environmental acoustic stresses characterizing the native habitat. Frequency dependent attenuation (FDA), reverberation, and irregular amplitude fluctuations (IAFs) are the main components of degradation. A high and low carrier frequency range of four synthetic signals were transmitted in five different habitat types to study the benefit of trill and whistle-structured signals. Results suggest that whistles degrade less than trills in each of the habitats. Trills were of benefit in open habitats.

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Nuptial vocalizations of male Least Seedsnipe: structure and evolutionary significance

Article Abstract:

Nuptial vocalizations of the Least Seedsnipe (Thinocorus rumicivorus) are similar to those of many scolopacids in complexity, syntactical properties, and rhythmicity and resemble vocalizations of Common Snipe. The one- and two-part ground/perch calls of Least Seedsnipe and Common Seedsnipe are similar in structure and function. The calls are brief and simple in constituent elements and other characteristics. The Least Seedsnipe also has a more complex aerial vocalization. Phylogenetic conclusions are, however, infeasible at this stage.

Observations, Snipes

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Acoustic signal amplitude patterns: a computer simulation investigation of the acoustic adaptation hypothesis

Article Abstract:

A study of simulated level of degradation of rapid amplitude modulation (AM) versus low rate AM signals due to reverberation and irregular amplitude fluctuations supports the acoustic adaptation hypothesis. The performance of signals with rapid or slow AM is dependent on the variability of the transmission quality. The transmission of signals with rapid AM has a lower variability than that of signals with slow AM in open habitats. The transmission of signals shows an opposite behavior in closed habitats.

Usage, Sound production by animals, Computer simulation, Animal vocalizations

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