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Hearing sensitivity and amplitude coding in bats are differentially shaped by echolocation calls and social calls

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Author(s)

Ella Z Lattenkamp, Martina Nagy, Markus Drexl, Sonja C Vernes, Lutz Wiegrebe, Mirjam Knörnschild

School/Research organisations

Abstract

Differences in auditory perception between species are influenced by phylogenetic origin and the perceptual challenges imposed by the natural environment, such as detecting prey- or predator-generated sounds and communication signals. Bats are well suited for comparative studies on auditory perception since they predominantly rely on echolocation to perceive the world, while their social calls and most environmental sounds have low frequencies. We tested if hearing sensitivity and stimulus level coding in bats differ between high and low-frequency ranges by measuring auditory brainstem responses (ABRs) of 86 bats belonging to 11 species. In most species, auditory sensitivity was equally good at both high- and low-frequency ranges, while amplitude was more finely coded for higher frequency ranges. Additionally, we conducted a phylogenetic comparative analysis by combining our ABR data with published data on 27 species. Species-specific peaks in hearing sensitivity correlated with peak frequencies of echolocation calls and pup isolation calls, suggesting that changes in hearing sensitivity evolved in response to frequency changes of echolocation and social calls. Overall, our study provides the most comprehensive comparative assessment of bat hearing capacities to date and highlights the evolutionary pressures acting on their sensory perception.

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Details

Original languageEnglish
Article number20202600
Number of pages10
JournalProceedings of the Royal Society B: Biological Sciences
Volume288
Issue number1942
Early online date6 Jan 2021
DOIs
Publication statusPublished - 13 Jan 2021

    Research areas

  • Audiogram, Hearing threshold, Sensory system evolution, Amplitude coding, Dynamic range, Auditory brainstem responses

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