Reptile Vocalization Is Surprisingly Flexible and Complex
Phenotypic plasticity of gecko calls reveals the complex communication of lizards
It has now been shown for the first time that non-avian reptiles are able to adjust their calls in relation to environmental noise as is known for the complex vocal communication systems of birds and mammals.
Credit: © Henrik Brumm
The sophisticated vocal communication systems of birds and mammals are characterized by a high degree of plasticity in which signals are individually adjusted in response to changes in the environment. One mechanism of such vocal plasticity is the Lombard effect, in which the call amplitude increases depending on the level of ambient noise. This Lombard effect is often accompanied by an increase in the duration of the call, which further helps to detect the signals in noise.
In non-avian reptiles some species do have vocal communication, like for example the Tokay, a night active gecko from South East Asia. Within his repertoire, especially the loud GECK-O call stands out and led to his scientific name Gekko gecko. The GECK-O call has important functions for the communication of Tokay males to attract females and to repel rival males. This call is often preceded by low-amplitude cackles.
However, the researchers could not find a Lombard effect in the calls, as the Tokays did not increase the amplitude of their call syllables in relation to the background noise level. “The study suggests that the Lombard effect evolved independently in birds and mammals”, says Henrik Brumm, first author of the study and research group leader in Seewiesen.
Contacts and sources:
Dr. Henrik Brumm
Max Planck Institute for Ornithology, Seewiesen
Citation: Vocal plasticity in a reptile
Henrik Brumm, Sue Anne Zollinger
Published 24 May 2017.DOI: 10.1098/rspb.2017.0451
Source: http://www.ineffableisland.com/2017/05/reptile-vocalization-is-surprisingly.html
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