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Keywords: Source level
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Journal Articles
J Exp Biol (2020) 223 (12): jeb223909.
Published: 26 June 2020
... and compared it to closely related species with very different feeding ecology and to that of the niche-sharing but distantly related Myotis daubentonii . Our results show that M. macrophyllum uses higher source levels and emits less-directional calls than other phyllostomids. In the field, its call...
Journal Articles
J Exp Biol (2020) 223 (2): jeb217109.
Published: 28 January 2020
... absorption adjust their vocalizations in a non-logarithmic fashion to maximize echo-to-noise ratio at long ranges and to avoid high echo levels when close to a target. Microphone array Intensity compensation Source level Echo level CF bats Atmospheric absorption Echolocating bats navigate...
Journal Articles
J Exp Biol (2019) 222 (16): jeb206169.
Published: 19 August 2019
... in the net pen, except during the buzz phase, where slightly longer ICIs were used in the pool. We further show that average click source levels were 4–7 dB higher in the net pen. Because of the very low-level in-band ambient noise in both environments, we posit that the porpoises adapted their echolocation...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (2): jeb189217.
Published: 25 January 2019
... to target ranges of ∼100 m. TRO consistently kept ICIs above the two-way travel time (TWTT) for target ranges shorter than ∼100 m, whereas SAY switched between clicking at ICIs above and below the TWTT for target ranges down to ∼25 m. Source levels changed on average by 17log 10 (target range...
Includes: Supplementary data
Journal Articles
J Exp Biol (2017) 220 (14): 2654–2665.
Published: 15 July 2017
...: Wild Amazon river dolphins increase biosonar beamwidth and decrease source level during prey approach while click rates transition into a buzz phase at the time of prey capture. Beam pattern Boto Echolocation Gain control Source level Toothed whale Echolocation enables toothed whales...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (3): 334–340.
Published: 1 February 2016
... the bat's acoustic field of view and hence its perception of the echo scene. The intensity (source level) and directionality of the emitted calls directly contribute to the bat's acoustic field of view; however, the source level and directionality of the big brown bat's sonar signals have not been measured...
Journal Articles
J Exp Biol (2014) 217 (17): 3028–3032.
Published: 1 September 2014
... duration, pulse interval and source levels with those of gleaning individuals previously recorded using the same setup. We found differences in all variables with the strongest difference in source levels, where bats called at a mean of 119 dB peSPL (compared with 75 dB peSPL when gleaning). Bat faecal...
Journal Articles
J Exp Biol (2010) 213 (19): 3263–3268.
Published: 1 October 2010
...Jens C. Koblitz; Peter Stilz; Hans-Ulrich Schnitzler SUMMARY Recordings of the echolocation signals of landing big brown bats with a two-dimensional 16-microphone array revealed that the source level reduction of 7 dB per halving of distance is superimposed by a variation of up to 12 dB within...
Journal Articles
J Exp Biol (2007) 210 (1): 56–64.
Published: 1 January 2007
...Anne Villadsgaard; Magnus Wahlberg; Jakob Tougaard SUMMARY Field recordings of harbour porpoises (Phocoena phocoena) were made in the inner Danish waters with a vertical array of three or four hydrophones. The back-calculated source level ranged from 178 to 205 dB re 1μPa pp @ 1 m with a mean...
Journal Articles
J Exp Biol (2005) 208 (7): 1321–1327.
Published: 1 April 2005
... in the field is restricted to a small number of species. We describe a novel stereo videogrammetry method used to study flight and echolocation behaviour, and to measure call source levels of the aerial hawking bat Eptesicus bottae (Vespertilionidae). Bats flew close to their predicted minimum power speed...
Journal Articles
J Exp Biol (2004) 207 (11): 1811–1823.
Published: 1 May 2004
... eating Grampus griseus . Pseudorca produces short duration (30 μs), broadband( Q =2–3) signals with peak frequencies around 40 kHz, centroid frequencies of 30–70 kHz, and source levels between 201–225 dB re. 1 μPa (peak to peak, pp). Grampus also produces short (40 μs),broadband ( Q =2–3) signals...