Precise Doppler shift compensation in the hipposiderid bat, Hipposideros armiger.

Abstract:

: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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Schoeppler D,Schnitzler HU,Denzinger A

doi

10.1038/s41598-018-22880-y

subject

Has Abstract

pub_date

2018-03-15 00:00:00

pages

4598

issue

1

issn

2045-2322

pii

10.1038/s41598-018-22880-y

journal_volume

8

pub_type

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