Evolution of high duty cycle echolocation in bats

@article{Fenton2012EvolutionOH,
  title={Evolution of high duty cycle echolocation in bats},
  author={M. Brock Fenton and Paul A. Faure and John M Ratcliffe},
  journal={Journal of Experimental Biology},
  year={2012},
  volume={215},
  pages={2935 - 2944}
}
Summary Duty cycle describes the relative ‘on time’ of a periodic signal. In bats, we argue that high duty cycle (HDC) echolocation was selected for and evolved from low duty cycle (LDC) echolocation because increasing call duty cycle enhanced the ability of echolocating bats to detect, lock onto and track fluttering insects. Most echolocators (most bats and all birds and odontocete cetaceans) use LDC echolocation, separating pulse and echo in time to avoid forward masking. They emit short… 
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Sonar Signals of Bats and Toothed Whales
This chapter reviews echolocation signals of bats and toothed whales. It addresses mechanisms of sound production and reception, signal structure, patterns of call production, and the role of…
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TLDR
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Evolution of the heteroharmonic strategy for target-range computation in the echolocation of Mormoopidae
TLDR
The hypothesis that the ability to perform heteroharmonic computations evolved separately from the ability of using long constant-frequency echolocation calls, high duty cycle echlocation, and Doppler Shift Compensation is stressed.
Fast-moving bat ears create informative Doppler shifts
TLDR
This work investigates whether certain bats (rhinolophid and hipposiderid bats) actively create Doppler shifts with their pinnae to encode additional sensory information, and shows that the bats’ active pinna motions are a source of Dopple shifts that have all attributes required for a functional relevance.
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References

SHOWING 1-10 OF 148 REFERENCES
High duty cycle echolocation and prey detection by bats
TLDR
It is suggested that some echolocation call characteristics, particularly duty cycle and pulse duration, translate into improved ability to detect fluttering targets in clutter, and that HDC eCholocation confers a superior ability to detects fluttering prey in the forest understory compared with LDC echlocation.
Scaling of echolocation call parameters in bats.
  • G. Jones
  • Physics
    The Journal of experimental biology
  • 1999
TLDR
Rhinolophids escape this constraint by Doppler shift compensation and, importantly, can exploit advantages associated with the emission of both high-frequency and long-duration calls.
Signal strength, timing, and self-deafening: the evolution of echolocation in bats
TLDR
It is proposed that the ancestors of bats were small, nocturnal, sylvatic gliders that used echolocation for general orientation and used echo- location to detect, track, and assess flying insects, which they attacked while gliding.
Echolocation range and wingbeat period match in aerial-hawking bats
TLDR
It is argued that a species' call frequency is at such a pitch that the resulting detection range matches theirWingbeat period, and small and medium–sized bats in fact matched their maximum detection range for insects and larger flying targets to their wingbeat period.
Information in sonar echoes of fluttering insects available for echolocating bats
Insects were mounted in the acoustical beam of an ultrasonic loudspeaker transmitting either an 80‐kHz continuous constant frequency (CF) tone or a short frequency‐modulated (FM) signal (82–18 kHz).…
Vespertilionid bats control the width of their biosonar sound beam dynamically during prey pursuit
TLDR
Directionality is proposed as an explanation for the frequency decrease observed in the buzz of aerial hawking vespertilionid bats and dynamic control of beam width in both species is demonstrated.
Echolocating Bats Cry Out Loud to Detect Their Prey
TLDR
It is concluded that for bats with similar hunting habits, prey detection range represents a unifying constraint on the emitted intensity largely independent of call shape, body size, and close phylogenetic relationships.
Frequency tracking and Doppler shift compensation in response to an artificial CF/FM echolocation sound in the CF/FM bat,Noctilio albiventris
TLDR
Bats in flight lower the frequency of their emitted pulses to compensate for Doppler shifts caused by their own flight speed and systematically shift the frequencyof their emitted CF component so that the echo CF frequency returns close to that of the CF component of the artificial CF/FM pulse, over the frequency range where tracking occurs.
Auditory fovea and Doppler shift compensation: adaptations for flutter detection in echolocating bats using CF-FM signals
TLDR
The frequency range of the foveal areas with their flutter processing neurons overlaps exactly with the frequency range where DS compensating bats most likely receive echoes from fluttering insects, indicating that auditory fovea and DSC are adaptations for the detection and evaluation of insects flying in clutter.
Echolocating bats emit a highly directional sonar sound beam in the field
TLDR
Directionality of echolocation calls of the trawling Daubenton's bat, Myotis daubentonii, flying over a pond in its natural habitat was measured and the relationship between frequency and directionality can be explained by the simple piston model.
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