Doppler-shift compensation behavior by Wagner’s mustached bat, <i>Pteronotus personatus</i>

Smotherman, Michael; Guillén-Servent, Antonio

doi:10.1121/1.2912436

Cited by 26 publications

(24 citation statements)

References 27 publications

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“…The two LDC Pteronotus spp. we recorded, and other species in this genus, emit relatively long calls for LDC bats, with some narrowband elements, and P. personatus accomplishes partial Doppler shift compensation (Smotherman and Guillén-Servent, 2008). However, their reaction to the fluttering prey did not differ from that of other LDC bats in the present study.…”

Section: Discussion Prey Detectioncontrasting

confidence: 41%

High duty cycle echolocation and prey detection by bats

Lazure

Fenton

2011

Journal of Experimental Biology

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SUMMARYThere are two very different approaches to laryngeal echolocation in bats. Although most bats separate pulse and echo in time by signalling at low duty cycles (LDCs), almost 20% of species produce calls at high duty cycles (HDCs) and separate pulse and echo in frequency. HDC echolocators are sensitive to Doppler shifts. HDC echolocation is well suited to detecting fluttering targets such as flying insects against a cluttered background. We used two complementary experiments to evaluate the relative effectiveness of LDC and HDC echolocation for detecting fluttering prey. We measured echoes from fluttering targets by broadcasting artificial bat calls, and found that echo amplitude was greatest for sounds similar to those used in HDC echolocation. We also collected field recordings of syntopic LDC and HDC bats approaching an insect-like fluttering target and found that HDC bats approached the target more often (18.6% of passes) than LDC bats (1.2% of passes). Our results suggest 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 detect fluttering prey in the forest understory compared with LDC echolocation. The prevalence of moths in the diets of HDC bats, which is often used as support for the allotonic frequency hypothesis, can therefore be partly explained by the better flutter detection ability of HDC bats. Supplementary material available online at

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Section: Discussion Prey Detectioncontrasting

confidence: 41%

High duty cycle echolocation and prey detection by bats

Lazure

Fenton

2011

Journal of Experimental Biology

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“…The process in high duty cycle bats depends upon Doppler shift compensation, which involves lowering the CF frequency of the outgoing signal to compensate for the Doppler-shifted increase in frequency of the returning echo. The bat's goal is to maintain the frequency in the returning echoes at the centre of the acoustic fovea (Smotherman & Guillén-Servent 2008). High duty cycle echolocation appears to be a specialization for detecting fluttering insects within foliage (Lazure & Fenton 2011) that has evolved twice in bats (Teeling 2009).…”

Section: Bat Hearingmentioning

confidence: 98%

Questions, ideas and tools: lessons from bat echolocation

Fenton

2013

Animal Behaviour

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“…The remaining five extant species of Pteronotus emit sonar calls consisting of a short-CF segment (<5 ms) followed by a downward FM sweep. [20][21][22][23][24][25] Molecular evidence shows that P. parnellii derives from the most basal node in the Pteronotus tree 26 [ Fig. 1(B)].…”

Section: Introductionmentioning

confidence: 99%

Evolution of neuronal mechanisms for echolocation: Specializations for target-range computation in bats of the genus Pteronotus

Hechavarría

Macías²,

Vater³

et al. 2013

The Journal of the Acoustical Society of America

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Delay tuning was studied in the auditory cortex of Pteronotus quadridens. All the 136 delay-tuned units that were studied responded strongly to heteroharmonic pulse-echo pairs presented at specific delays. In the heteroharmonic pairs, the first sonar call harmonic marks the timing of pulse emission while one of the higher harmonics (second or third) indicates the timing of the echo. Delay-tuned units are organized chronotopically along a rostrocaudal axis according to their characteristic delay. There is no obvious indication of multiple cortical axes specialized in the processing of different harmonic combinations of pulse and echo. Results of this study serve for a straight comparison of cortical delay-tuning between P. quadridens and the well-studied mustached bat, Pteronotus parnellii. These two species stem from the most recent and most basal nodes in the Pteronotus lineage, respectively. P. quadridens and P. parnellii use comparable heteroharmonic target-range computation strategies even though they do not use biosonar calls of a similar design. P. quadridens uses short constant-frequency (CF)/frequency-modulated (FM) echolocation calls, while P. parnellii uses long CF/FM calls. The ability to perform "heteroharmonic" target-range computations might be an ancestral neuronal specialization of the genus Pteronotus that was subjected to positive Darwinian selection in the evolution.

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Doppler-shift compensation behavior by Wagner’s mustached bat, Pteronotus personatus

Cited by 26 publications

References 27 publications

High duty cycle echolocation and prey detection by bats

High duty cycle echolocation and prey detection by bats

Questions, ideas and tools: lessons from bat echolocation

Evolution of neuronal mechanisms for echolocation: Specializations for target-range computation in bats of the genus Pteronotus

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