scholarly journals Erratum: Type of shelter and first description of the echolocation call of disk-winged bat (Thyroptera devivoi)

2021 ◽  
Keyword(s):  
Echolocation Call

scholarly journals Description of Echolocation Call Parameters for Urban Bats in Vietnam as a Step Towards a More Integrated Acoustic Monitoring of Urban Wildlife in Southeast Asia

Diversity ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 18
Author(s):  
Long Kim Pham ◽  
Bang Van Tran ◽  
Quy Tan Le ◽  
Trung Thanh Nguyen ◽  
Christian C. Voigt
Keyword(s):  
Discriminant Function ◽  
Discriminant Function Analysis ◽  
Function Analysis ◽  
Quantitative Description ◽  
Southeast Asian ◽  
Asian Countries ◽  
Echolocation Call ◽  
Echolocation Calls ◽  
Pilot Work ◽  
Southeast Asian Countries

This study is the first step towards more systematic monitoring of urban bat fauna in Vietnam and other Southeast Asian countries by collecting bat echolocation call parameters in Ho Chi Minh and Tra Vinh cities. We captured urban bats and then recorded echolocation calls after releasing in a tent. Additional bat’s echolocation calls from the free-flying bats were recorded at the site where we captured bat. We used the obtained echolocation call parameters for a discriminant function analysis to test the accuracy of classifying these species based on their echolocation call parameters. Data from this pilot work revealed a low level of diversity for the studied bat assemblages. Additionally, the discriminant function analysis successfully classified bats to four bat species with an accuracy of >87.4%. On average, species assignments were correct for all calls from Taphozous melanopogon (100% success rate), for 70% of calls from Pipistrellus javanicus, for 80.8% of calls from Myotis hasseltii and 67.3% of calls from Scotophilus kuhlii. Our study comprises the first quantitative description of echolocation call parameters for urban bats of Vietnam. The success in classifying urban bats based on their echolocation call parameters provides a promising baseline for monitoring the effect of urbanization on bat assemblages in Vietnam and potentially also other Southeast Asian countries.

Divergent echolocation call frequencies in insular rhinolophids (Chiroptera): a case of character displacement?

2007 ◽  
Vol 34 (12) ◽  
pp. 2129-2138 ◽  
Author(s):  
Danilo Russo ◽  
Mauro Mucedda ◽  
Monica Bello ◽  
Stefania Biscardi ◽  
Ermanno Pidinchedda ◽  
...  
Keyword(s):  
Character Displacement ◽  
Echolocation Call

Echolocation call frequencies of bats vary with body temperature and weather conditions

2021 ◽  
Vol 180 ◽  
pp. 51-61
Author(s):  
Huan Wu ◽  
Lixin Gong ◽  
Tinglei Jiang ◽  
Jiang Feng ◽  
Aiqing Lin
Keyword(s):  
Body Temperature ◽  
Weather Conditions ◽  
Echolocation Call

scholarly journals Rapid jamming avoidance in biosonar

2006 ◽  
Vol 274 (1610) ◽  
pp. 651-660 ◽  
Author(s):  
Erin H Gillam ◽  
Nachum Ulanovsky ◽  
Gary F McCracken
Keyword(s):  
Abrupt Change ◽  
Considerable Effort ◽  
Echolocation Call ◽  
Tadarida Brasiliensis ◽  
Radar Systems ◽  
Spectral Shifts ◽  
Processing Strategies ◽  
Jamming Avoidance ◽  
Sonar Systems ◽  
Behavioural Correlations

The sonar systems of bats and dolphins are in many ways superior to man-made sonar and radar systems, and considerable effort has been devoted to understanding the signal-processing strategies underlying these capabilities. A major feature determining the efficiency of sonar systems is the sensitivity to noise and jamming signals. Previous studies indicated that echolocating bats may adjust their signal structure to avoid jamming (‘jamming avoidance response’; JAR). However, these studies relied on behavioural correlations and not controlled experiments. Here, we provide the first experimental evidence for JAR in bats. We presented bats ( Tadarida brasiliensis ) with ‘playback stimuli’ consisting of recorded echolocation calls at one of six frequencies. The bats exhibited a JAR by shifting their call frequency away from the presented playback frequency. When the approaching bats were challenged by an abrupt change in the playback stimulus, they responded by shifting their call frequencies upwards, away from the playback. Interestingly, even bats initially calling below the playback's frequency shifted their frequencies upwards, ‘jumping’ over the playback frequency. These spectral shifts in the bats' calls occurred often within less than 200 ms, in the first echolocation call emitted after the stimulus switch—suggesting that rapid jamming avoidance is important for the bat.

scholarly journals Genetic divergence and echolocation call frequency in cryptic species of Hipposideros larvatus s.l. (Chiroptera: Hipposideridae) from the Indo-Malayan region

2006 ◽  
Vol 88 (1) ◽  
pp. 119-130 ◽  
Author(s):  
ADORA THABAH ◽  
STEPHEN J. ROSSITER ◽  
TIGGA KINGSTON ◽  
SHUYI ZHANG ◽  
STUART PARSONS ◽  
...  
Keyword(s):  
Cryptic Species ◽  
Genetic Divergence ◽  
Echolocation Call

scholarly journals Don’t believe the mike: behavioural, directional, and environmental impacts on recorded bat echolocation call measures

2018 ◽  
Vol 96 (4) ◽  
pp. 283-288 ◽  
Author(s):  
J.M. Ratcliffe ◽  
L. Jakobsen
Keyword(s):  
Environmental Impacts ◽  
Acoustic Signals ◽  
Bird Song ◽  
Great Flexibility ◽  
Echolocation Call ◽  
Echolocation Calls ◽  
Acoustic Information ◽  
Species Overlap ◽  
Actual Signal ◽  
Nocturnal Mammals

Echolocation calls produced by bats in their larynges allow these flying, nocturnal mammals to orient and find food at night. The acoustic signals are not like bird song, and even individual bats exhibit great flexibility in call design and between-species overlap is common. As a result, identifying bats to species by their echolocation calls even in communities with few bat species can be difficult. Unfortunately, the situation is worse still. As a result of several factors — some to do with microphones, some with environment, some with bats, and the calls themselves — acoustic information transmitted to and transduced by microphones can be dramatically different from the actual signal produced by the bat and as would be recorded on axis, close to its mouth using ideal microphones under ideal conditions. We outline some of these pitfalls and discuss ways to make the best of a bad situation. Overall, however, we stress that many of these factors cannot be ignored and do impact our recordings.

Bats are still not birds in the digital era: echolocation call variation and why it matters for bat species identification

2018 ◽  
Vol 96 (2) ◽  
pp. 63-78 ◽  
Author(s):  
Danilo Russo ◽  
Leonardo Ancillotto ◽  
Gareth Jones
Keyword(s):  
Adaptive Significance ◽  
Bird Songs ◽  
Echolocation Call ◽  
Comprehensive Overview ◽  
Echolocation Calls ◽  
Digital Era ◽  
Call Classification ◽  
Acoustic Surveys ◽  
And Behavior ◽  
And Control

The recording and analysis of echolocation calls are fundamental methods used to study bat distribution, ecology, and behavior. However, the goal of identifying bats in flight from their echolocation calls is not always possible. Unlike bird songs, bat calls show large variation that often makes identification challenging. The problem has not been fully overcome by modern digital-based hardware and software for bat call recording and analysis. Besides providing fundamental insights into bat physiology, ecology, and behavior, a better understanding of call variation is therefore crucial to best recognize limits and perspectives of call classification. We provide a comprehensive overview of sources of interspecific and intraspecific echolocation call variations, illustrating its adaptive significance and highlighting gaps in knowledge. We remark that further research is needed to better comprehend call variation and control for it more effectively in sound analysis. Despite the state-of-art technology in this field, combining acoustic surveys with capture and roost search, as well as limiting identification to species with distinctive calls, still represent the safest way of conducting bat surveys.

scholarly journals Echolocation call frequency variation in horseshoe bats: molecular basis revealed by comparative transcriptomics

2020 ◽  
Vol 287 (1934) ◽  
pp. 20200875
Author(s):  
Haijian Sun ◽  
Wenli Chen ◽  
Jiaying Wang ◽  
Libiao Zhang ◽  
Stephen J. Rossiter ◽  
...  
Keyword(s):  
Genetic Basis ◽  
De Novo ◽  
Expression Profiles ◽  
Frequency Variation ◽  
Echolocation Call ◽  
Reverse Transcription Pcr ◽  
Strong Candidate ◽  
Horseshoe Bat ◽  
Candidate Loci ◽  
Horseshoe Bats

Recently diverged taxa with contrasting phenotypes offer opportunities for unravelling the genetic basis of phenotypic variation in nature. Horseshoe bats are a speciose group that exhibit a derived form of high-duty cycle echolocation in which the inner ear is finely tuned to echoes of the narrowband call frequency. Here, by focusing on three recently diverged subspecies of the intermediate horseshoe bat ( Rhinolophus affinis ) that display divergent echolocation call frequencies, we aim to identify candidate loci putatively involved in hearing frequency variation. We used de novo transcriptome sequencing of two mainland taxa ( himalayanus and macrurus ) and one island taxon ( hainanus ) to compare expression profiles of thousands of genes. By comparing taxa with divergent call frequencies (around 15 kHz difference), we identified 252 differentially expressed genes, of which six have been shown to be involved in hearing or deafness in human/mouse. To obtain further validation of these results, we applied quantitative reverse transcription–PCR to the candidate gene FBXL15 and found a broad association between the level of expression and call frequency across taxa. The genes identified here represent strong candidate loci associated with hearing frequency variation in bats.

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