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Hearing in the African lungfish Protopterus annectens: preadaptation for pressure hearing in tetrapods?

Lookup NU author(s): Dr Christian Brandt

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Abstract

Lungfishes are the closest living relatives of the tetrapods, and the ear of recent lungfishes resembles the tetrapod ear more than the ear of ray-finned fishes and is therefore of interest for understanding the evolution of hearing in the early tetrapods. The water-to-land transition resulted in major changes in the tetrapod ear associated with the detection of air-borne sound pressure, as evidenced by the late and independent origins of tympanic ears in all of the major tetrapod groups. To investigate lungfish pressure and vibration detection, we measured the sensitivity and frequency responses of five West African lungfish (Protopterus annectens) using brainstem potentials evoked by calibrated sound and vibration stimuli in air and water. We find that the lungfish ear has good low-frequency vibration sensitivity, like recent amphibians, but poor sensitivity to air-borne sound. The skull shows measurable vibrations above 100 Hz when stimulated by air-borne sound, but the ear is apparently insensitive at these frequencies, suggesting that the lungfish ear is neither adapted nor pre-adapted for aerial hearing. Thus, if the lungfish ear is a model of the ear of early tetrapods, their auditory sensitivity was limited to very low frequencies on land, mostly mediated by substrate-borne vibrations.


Publication metadata

Author(s): Christensen-Dalsgaard J, Brandt C, Wilson M, Wahlberg M, Madsen PT

Publication type: Article

Publication status: Published

Journal: Biology Letters

Year: 2011

Volume: 7

Issue: 1

Pages: 139-141

Print publication date: 23/02/2011

ISSN (print): 1744-9561

ISSN (electronic): 1744-957X

Publisher: The Royal Society Publishing

URL: http://dx.doi.org/10.1098/rsbl.2010.0636

DOI: 10.1098/rsbl.2010.0636


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