scholarly journals EFFECTS OF CLUTTER ON ECHOLOCATION CALL STRUCTURE OF MYOTIS SEPTENTRIONALIS AND M. LUCIFUGUS

2004 ◽  
Vol 85 (2) ◽  
pp. 273-281 ◽  
Author(s):  
Hugh G. Broders ◽  
C. Scott Findlay ◽  
Ligang Zheng
Keyword(s):  
Echolocation Call ◽  
Myotis Septentrionalis ◽  
Call Structure

Spatial variation in the echolocation calls of the little brown bat (Myotis lucifugus)

2013 ◽  
Vol 91 (11) ◽  
pp. 795-801 ◽  
Author(s):  
N. Veselka ◽  
L.P. McGuire ◽  
Y.A. Dzal ◽  
L.A. Hooton ◽  
M.B. Fenton
Keyword(s):  
New York ◽  
Spatial Variation ◽  
Spatial Scale ◽  
Hudson River ◽  
Myotis Lucifugus ◽  
Echolocation Call ◽  
Echolocation Calls ◽  
Call Structure ◽  
Continental Scale ◽  
Little Brown Bat

We studied spatial variation in echolocation call structure of the little brown bat (Myotis lucifugus (LeConte, 1831)) by analysing calls recorded from free-flying individuals at 1 site in Haida Gwaii, British Columbia, 1 site in Chautaqua, New York, and 20 sites along the Hudson River, New York. We controlled for factors that are often thought to lead to interspecific variation in echolocation calls (habitat, ontogeny, presence of conspecifics, recording techniques, ambient conditions), which allowed us to focus on the effect of spatial scale on call structure. As predicted, we found that at small scales (up to 1 km), there was significant geographic variation, likely owing to roost-specific signatures and group foraging activities. At intermediate scales (2–500 km), we found no differences in call structure, suggesting that populations within this area are part of a single hibernating and breeding population. Finally, echolocation call structure differed at the continental scale (>1000 km) likely because of little genetic exchange among sampled populations. Our results highlight the importance of considering the magnitude of spatial scale when examining variation in echolocation call structure.

scholarly journals Acoustic deterrents influence foraging activity, flight and echolocation behaviour of free-flying bats

2021 ◽  
Author(s):  
Lia R. V. Gilmour ◽  
Marc W. Holderied ◽  
Simon P. C. Pickering ◽  
Gareth Jones
Keyword(s):  
Human Impacts ◽  
Flight Speed ◽  
Masking Effect ◽  
Foraging Activity ◽  
Echolocation Call ◽  
Call Structure ◽  
Acoustic Methods ◽  
Social Calls ◽  
Direct Flight ◽  
Masking Noise

Acoustic deterrents have shown potential as a viable mitigation measure to reduce human impacts on bats, however, the mechanisms underpinning acoustic deterrence of bats have yet to be explored. Bats avoid ambient ultrasound in their environment and alter their echolocation calls in response to masking noise. Using stereo thermal videogrammetry and acoustic methods, we tested predictions that i) bats would avoid acoustic deterrents and forage and social call less in a ‘treated airspace’; ii) deterrents would cause bats to fly with more direct flight paths akin to commuting behaviour and in line with a reduction in foraging activity, resulting in increased flight speed and decreased flight tortuosity; iii) bats would alter their echolocation call structure in response to the masking deterrent sound. As predicted, overall bat activity was reduced by 30% and we recorded a significant reduction in counts of Pipistrellus pygmaeus (27%), Myotis spp. (probably M. daubentonii) (26%) and Nyctalus and Eptesicus spp. (68%) passes. P. pygmaeus feeding buzzes were also reduced by the deterrent in relation to general activity (by 38%), however social calls were not (only 23% reduction). Bats also increased their flight speed and reduced the tortuosity of their flight paths and P. pygmaeus reduced echolocation call bandwidth and start frequency of calls in response to deterrent playback, probably due to the masking effect of the sound. Deterrence could therefore be used to remove bats from areas where they forage, for example wind turbines and roads, where they may be under threat from direct mortality.

Variation in echolocation calls of Hipposideros amiger during habituation to a novel, captive environment

Behaviour ◽  
2015 ◽  
Vol 152 (7-8) ◽  
pp. 1083-1095 ◽  
Author(s):  
Y. Chen ◽  
Q. Liu ◽  
Y.G. Shao ◽  
L.J. Tan ◽  
Z.F. Xiang ◽  
...  
Keyword(s):  
Natural Habitat ◽  
Peak Frequency ◽  
The Novel ◽  
Echolocation Call ◽  
Echolocation Calls ◽  
Call Structure ◽  
In Captivity ◽  
Free Ranging ◽  
Great Leaf ◽  
Frequency Pulse

Animals alter their behaviour during habituation to novel environments. Echolocating bats exhibit remarkable flexibility in their acoustic signals to sense diverse microhabitats. Previous studies have described intra-individual variation in echolocation calls of bats in different environments, but few studies have systematically quantified these changes in detail. We investigated variation in echolocation call structure of the great leaf-nosed bat, Hipposideros armiger during habituation to a novel, captive environment. Echolocation calls of free-ranging bats were recorded in the natural habitat and in captivity over a three-week period. We found that bats exhibited significant changes in some call parameters following introduction to the novel captive environment, and some parameters changed continuously over time. We observed plasticity in peak frequency, pulse duration and pulse rate during the captive period. This suggests that variation in echolocation calls of bats in response to a novel captive environment is a progressive process, during which bats adjust echolocation call structure to habituate gradually to their surroundings.

Echolocation call structure and intensity in five species of insectivorous bats.

1995 ◽  
Vol 198 (2) ◽  
pp. 475-489 ◽  
Author(s):  
D A Waters ◽  
G Jones
Keyword(s):  
Energy Flux ◽  
Escape Response ◽  
Free Flight ◽  
Echolocation Call ◽  
Constant Frequency ◽  
Insectivorous Bats ◽  
Call Structure ◽  
Low Intensity ◽  
Energy Flux Density ◽  
Rms Amplitude

Echolocation call intensity was measured in the laboratory for five species of British insectivorous bats in free flight and in the hand. All species showed similar call intensities of between 80 and 90 dB peSPL (peak equivalent SPL) at 1 m during flight except Plecotus auritus, whose call intensity was between 68 and 77 dB peSPL at 1 m. Calls from stationary bats were about 13 dB less intense than calls during flight. A method is proposed to measure the root mean square (rms) amplitude of echolocation calls and, hence, to calculate the energy flux density of the call. The constant-frequency calls of Rhinolophus hipposideros have energy flux densities approximately ten times higher than those of bats using frequency-modulated calls as a result of their longer durations and lower crest factors. It is argued that the low-intensity calls of P. auritus allow it to approach tympanate moths more closely before triggering their escape response.

scholarly journals Echolocation Call Structure of Fourteen Bat Species in Korea

2015 ◽  
Vol 31 (3) ◽  
pp. 160-175
Author(s):  
Dai Fukui ◽  
David A. Hill ◽  
Sun-Sook Kim ◽  
Sang-Hoon Han
Keyword(s):  
Echolocation Call ◽  
Call Structure

Roost and Echolocation Call Structure of the Alashanian PipistrelleHypsugo alaschanicus: First Confirmation as a Resident Species in Japan

Mammal Study ◽  
2013 ◽  
Vol 38 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Dai Fukui ◽  
Makoto Mochida ◽  
Aki Yamamoto ◽  
Kuniko Kawai
Keyword(s):  
Resident Species ◽  
Echolocation Call ◽  
Call Structure

Bats aloft: variability in echolocation call structure at high altitudes

2009 ◽  
Vol 64 (1) ◽  
pp. 69-79 ◽  
Author(s):  
Erin H. Gillam ◽  
Gary F. McCracken ◽  
John K. Westbrook ◽  
Ya-Fu Lee ◽  
Michael L. Jensen ◽  
...  
Keyword(s):  
High Altitudes ◽  
Echolocation Call ◽  
Call Structure

Observations of the echolocation, feeding behaviour, and habitat use of Euderma maculatum (Chiroptera: Vespertilionidae) in southcentral British Columbia

1981 ◽  
Vol 59 (6) ◽  
pp. 1099-1102 ◽  
Author(s):  
G. C. Woodsworth ◽  
G. P. Bell ◽  
M. B. Fenton
Keyword(s):  
British Columbia ◽  
Ponderosa Pine ◽  
Feeding Behaviour ◽  
Low Frequency ◽  
Breeding Population ◽  
Moderate Intensity ◽  
Echolocation Call ◽  
Feeding Site ◽  
Call Structure ◽  
High Level

A record of the spotted bat, Euderma maculatum, from Oliver, British Columbia, is the first for Canada, extending its known range approximately 900 km. The specimen was obtained from a well-established breeding population in this area and does not represent an accidental or stray record. Observations of the foraging bahaviour of E. maculatum suggest that it may change its strategy from a rapid traplining approach in the spring, to spending more time per feeding site later in the summer, always foraging in ponderosa pine montane woodland. In the study area, E. maculatum appeared to roost in areas with high steep cliffs. The echolocation calls of this species are of low frequency (fundamental from 15 to 8 kHz) and moderate intensity (80–90 dB). Our observations and the theoretical implications of its echolocation call structure suggest that E. maculatum is a fast-flying, high-level forager that may include a high proportion of tympanate moths in its diet.

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