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Precise Doppler shift compensation in the hipposiderid bat, Hipposideros armiger

Bats of the Rhinolophidae and Hipposideridae families, and Pteronotus parnellii, compensate for Doppler shifts generated by their own flight movement. They adjust their call frequency such that the frequency of echoes coming from ahead fall in a specialized frequency range of the hearing system, the...

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Autores principales: Schoeppler, Diana, Schnitzler, Hans-Ulrich, Denzinger, Annette
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5854618/
https://www.ncbi.nlm.nih.gov/pubmed/29545520
http://dx.doi.org/10.1038/s41598-018-22880-y
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author Schoeppler, Diana
Schnitzler, Hans-Ulrich
Denzinger, Annette
author_facet Schoeppler, Diana
Schnitzler, Hans-Ulrich
Denzinger, Annette
author_sort Schoeppler, Diana
collection PubMed
description Bats of the Rhinolophidae and Hipposideridae families, and Pteronotus parnellii, compensate for Doppler shifts generated by their own flight movement. They adjust their call frequency such that the frequency of echoes coming from ahead fall in a specialized frequency range of the hearing system, the auditory fovea, to evaluate amplitude and frequency modulations in echoes from fluttering prey. Some studies in hipposiderids have suggested a less sophisticated or incomplete Doppler shift compensation. To investigate the precision of Doppler shift compensation in Hipposideros armiger, we recorded the echolocation and flight behaviour of bats flying to a grid, reconstructed the flight path, measured the flight speed, calculated the echo frequency, and compared it with the resting frequency prior to each flight. Within each flight, the average echo frequency was kept constant with a standard deviation of 110 Hz, independent of the flight speed. The resting and reference frequency were coupled with an offset of 80 Hz; however, they varied slightly from flight to flight. The precision of Doppler shift compensation and the offset were similar to that seen in Rhinolophidae and P. parnellii. The described frequency variations may explain why it has been assumed that Doppler shift compensation in hipposiderids is incomplete.
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spelling pubmed-58546182018-03-22 Precise Doppler shift compensation in the hipposiderid bat, Hipposideros armiger Schoeppler, Diana Schnitzler, Hans-Ulrich Denzinger, Annette Sci Rep Article Bats of the Rhinolophidae and Hipposideridae families, and Pteronotus parnellii, compensate for Doppler shifts generated by their own flight movement. They adjust their call frequency such that the frequency of echoes coming from ahead fall in a specialized frequency range of the hearing system, the auditory fovea, to evaluate amplitude and frequency modulations in echoes from fluttering prey. Some studies in hipposiderids have suggested a less sophisticated or incomplete Doppler shift compensation. To investigate the precision of Doppler shift compensation in Hipposideros armiger, we recorded the echolocation and flight behaviour of bats flying to a grid, reconstructed the flight path, measured the flight speed, calculated the echo frequency, and compared it with the resting frequency prior to each flight. Within each flight, the average echo frequency was kept constant with a standard deviation of 110 Hz, independent of the flight speed. The resting and reference frequency were coupled with an offset of 80 Hz; however, they varied slightly from flight to flight. The precision of Doppler shift compensation and the offset were similar to that seen in Rhinolophidae and P. parnellii. The described frequency variations may explain why it has been assumed that Doppler shift compensation in hipposiderids is incomplete. Nature Publishing Group UK 2018-03-15 /pmc/articles/PMC5854618/ /pubmed/29545520 http://dx.doi.org/10.1038/s41598-018-22880-y Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Schoeppler, Diana
Schnitzler, Hans-Ulrich
Denzinger, Annette
Precise Doppler shift compensation in the hipposiderid bat, Hipposideros armiger
title Precise Doppler shift compensation in the hipposiderid bat, Hipposideros armiger
title_full Precise Doppler shift compensation in the hipposiderid bat, Hipposideros armiger
title_fullStr Precise Doppler shift compensation in the hipposiderid bat, Hipposideros armiger
title_full_unstemmed Precise Doppler shift compensation in the hipposiderid bat, Hipposideros armiger
title_short Precise Doppler shift compensation in the hipposiderid bat, Hipposideros armiger
title_sort precise doppler shift compensation in the hipposiderid bat, hipposideros armiger
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5854618/
https://www.ncbi.nlm.nih.gov/pubmed/29545520
http://dx.doi.org/10.1038/s41598-018-22880-y
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