... propellers several hundred meters from a vessel, can mask porpoise echolocation in a way that cannot be fully compensated for. As biosonar is vital for foraging and navigation around hazards such as gillnets for porpoises and other toothed whales, this study highlights that masking effects should...

... trials. These observations reject our hypothesis, leading us to conclude that bats display great resilience to clutter via short auditory integration times and acute auditory stream segregation rather than via biosonar adjustments. * Author for correspondence ( [email protected]...

.... Highlighted Article: Video recordings and acoustic stimulation show that bat foraging success decreases in the presence of high duty cycle moth signals; bats alter their echolocation to compensate. Jamming behavior Biosonar Duty cycle Eptesicus fuscus Bertholdia trigona Arctiinae...

...: Measurement of the vocal compensation of Daubenton's bats to masking noise reveals that bats defend echo-to-noise ratios by increasing call amplitude but not by spectrally adjusting calls. Chiroptera Biosonar Jamming avoidance response Lombard response Acoustic interference Natur og Univers...

... targets, suggesting a clutter rejection zone much shorter than their auditory integration time, and that such clutter rejection is greatly aided by spatial filtering with their directional biosonar beam. * Author for correspondence ( [email protected] ) Competing interests The authors...

... orientation Active sensing Way-finding Biosonar Spatial perception Landmark-guided navigation, a strategy by which animals find their way through the environment, has been studied in a wide range of species ( Chamizo et al., 2012 ; Cheng, 1986 ; Collett et al., 1986 ; Foo et al., 2007 ; Jensen...

...James A. Simmons; Shizuko Hiryu; Uday Shriram ABSTRACT In complex biosonar scenes, the delay of echoes represents the spatial distribution of objects in depth. To avoid overlap of echo streams from successive broadcasts, individual echolocation sounds should only be emitted after all echoes...

... a subsequent click is produced, presumably facilitating range estimation from the delay between clicks and returning echoes. However, this click–echo–click paradigm for the dolphin biosonar is mostly based on experiments with stationary animals echolocating fixed targets at ranges below ∼120 m. Therefore, we...

... dolphins (Inia geoffrensis) modify biosonar output level and directivity during prey interception in the wild . J. Exp. Biol.   220 , 2654 - 2665 . 10.1242/jeb.159913 Matsuta , N. , Hiryu , S. , Fujioka , E. , Yamada , Y. , Riquimaroux , H. and Watanabe , Y. ( 2013...

...Kelsey N. Hom; Meike Linnenschmidt; James A. Simmons; Andrea Megela Simmons ABSTRACT Echolocating bats emit trains of intense ultrasonic biosonar pulses and listen to weaker echoes returning from objects in their environment. Identification and categorization of echoes are crucial for orientation...

...P. Arranz; S. L. DeRuiter; A. K. Stimpert; S. Neves; A. S. Friedlaender; J. A. Goldbogen; F. Visser; J. Calambokidis; B. L. Southall; P. L. Tyack ABSTRACT Early studies that categorized odontocete pulsed sounds had few means of discriminating signals used for biosonar-based foraging from those used...

... interests. 26 11 2015 18 1 2016 © 2016. Published by The Company of Biologists Ltd 2016 Highlighted Article: Big brown bats are less susceptible to hearing losses after exposure to intense broadband noise than are terrestrial mammals. Biosonar Echolocation Hearing loss...

... of a vibroacoustic finite element model using bottlenose dolphin simulations: the dolphin biosonar beam is focused in stages . Bioacoustics   23 , 161 - 194 . 10.1080/09524622.2013.843061 DeRuiter , S. L. , Bahr , A. , Blanchet , M.-A. , Hansen , S. F. , Kristensen , J. H. , Madsen , P...

...Frants H. Jensen; Magnus Wahlberg; Kristian Beedholm; Mark Johnson; Natacha Aguilar de Soto; Peter T. Madsen ABSTRACT Echolocating animals exercise an extensive control over the spectral and temporal properties of their biosonar signals to facilitate perception of their actively generated auditory...

...James A. Simmons Big brown bats emit biosonar sounds and perceive their surroundings from the delays of echoes received by the ears. Broadcasts are frequency modulated (FM) and contain two prominent harmonics sweeping from 50 to 25 kHz (FM1) and from 100 to 50 kHz (FM2). Individual frequencies...

.... COMPETING INTERESTS No competing interests declared. 23 5 2013 30 7 2013 © 2013. Published by The Company of Biologists Ltd 2013 biosonar high-frequency hearing marine mammals auditory evoked potential Extensive studies have described hearing loss from congenital...

.... 2012 gain control model echolocation intensity compensation bat biosonar Sophisticated forms of echolocation have evolved in two mammalian groups, laryngeal echolocating bats and toothed whales. Echolocation (or biosonar) is an active orientation system allowing individuals to navigate...

... AEPs were dependent on the target distances. The echo-related AEP response amplitudes increased at further target distances, demonstrating an overcompensation of echo attenuation with target distance in the echo-perception system of the dolphin biosonar. Measurement and analysis of outgoing click...

...Mary E. Bates; James A. Simmons SUMMARY Echolocating big brown bats emit ultrasonic frequency-modulated (FM) biosonar sounds containing two prominent downward-sweeping harmonics (FM1 and FM2) and perceive target distance from echo delay. In naturally occurring echoes, FM1 and FM2 are delayed...

... animals in audiology and biosonar experiments. * Author for correspondence( [email protected] ) 30 6 2009 2009 echolocation porpoise foraging buzz biosonar Phocoena Echolocating animals can gather information about their environment by emitting sound pulses...