Pub Date : 2023-06-29DOI: 10.1080/09524622.2023.2229277
Ł. Pawelec, K. Graja, Jagoda Marchewczyk, A. Lipowicz
ABSTRACT Voice is an important biological cue, which may reveal a significant amount of information about an individual. Particularly in males, it plays a crucial role in processes like male competition or sexual selection. Additionally, voice can provide a cue for body size assessment. This study investigates the relationship between male voice characteristics and physical features (assessed by women) and determines the accuracy of these assessments. Three groups of female judges assessed 60 male voices (20 different voices per group) across seven categories of male physical features: height, body fat, musculature, body shape, hirsuteness, age and strength. Recordings of five vowels and sentence and number of anthropometric measurements were made for each of the studied men. Intra- and extragroup agreement of assessments of men’s physical characteristics was demonstrated. Men with lower fundamental frequency (F0 ) and lower formant dispersion (Df ) values were perceived as being heavier, older, stronger and more likely to have chest hair. However, across all the analysed fields of assessment, no accuracy was registered between estimates and men’s actual physical characteristics. These findings suggest that females were guided by stereotypes in their assessment of men’s appearance from voice alone. We propose the size exaggeration hypothesis as an explanation of this phenomenon
{"title":"Women misjudge men’s physical characteristics based on vocal cues","authors":"Ł. Pawelec, K. Graja, Jagoda Marchewczyk, A. Lipowicz","doi":"10.1080/09524622.2023.2229277","DOIUrl":"https://doi.org/10.1080/09524622.2023.2229277","url":null,"abstract":"ABSTRACT Voice is an important biological cue, which may reveal a significant amount of information about an individual. Particularly in males, it plays a crucial role in processes like male competition or sexual selection. Additionally, voice can provide a cue for body size assessment. This study investigates the relationship between male voice characteristics and physical features (assessed by women) and determines the accuracy of these assessments. Three groups of female judges assessed 60 male voices (20 different voices per group) across seven categories of male physical features: height, body fat, musculature, body shape, hirsuteness, age and strength. Recordings of five vowels and sentence and number of anthropometric measurements were made for each of the studied men. Intra- and extragroup agreement of assessments of men’s physical characteristics was demonstrated. Men with lower fundamental frequency (F0 ) and lower formant dispersion (Df ) values were perceived as being heavier, older, stronger and more likely to have chest hair. However, across all the analysed fields of assessment, no accuracy was registered between estimates and men’s actual physical characteristics. These findings suggest that females were guided by stereotypes in their assessment of men’s appearance from voice alone. We propose the size exaggeration hypothesis as an explanation of this phenomenon","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42239801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-05DOI: 10.1080/09524622.2023.2204325
Rogério Ferreira de Oliveira, André Felipe de Araújo Lira, Valentina Zaffaroni-Caorsi, G. J. B. de Moura
ABSTRACT Noise pollution contributes to the global biodiversity crisis, however the consequences of this pollution on anuran diversity patterns are poorly understood. This is especially true of less evident sources of noise like wind farms and highly exploited areas, as in the Brazilian semi-arid region. Here, we evaluated the influence of wind farm noise on anuran assemblages’ diversity at the Caatinga, a seasonal dry tropical forest in Brazil. We tested the hypothesis that wind farm noise negatively affects the diversity of anuran assemblages in terms of abundance, species richness and composition. Anurans were sampled in 19 temporary ponds along a noise gradient in two wind farms over a rainy season (March to August). A total of 2,047 individuals belonging to 20 species were recorded. Our results suggest that wind farm noise has a non-significant relationship with anuran diversity patterns (species richness, composition and abundance). To our knowledge, this is the first investigation into the effects of wind farm noise on anuran assemblages in the Caatinga dry forest. Despite our results suggesting that anuran diversity is insensitive to noise pollution caused by wind farms, identification of emerging threats is essential to mitigate impacts on anuran populations which are declining globally.
{"title":"Wind farm noise and anuran diversity patterns: a case study in Brazilian seasonal dry tropical forest","authors":"Rogério Ferreira de Oliveira, André Felipe de Araújo Lira, Valentina Zaffaroni-Caorsi, G. J. B. de Moura","doi":"10.1080/09524622.2023.2204325","DOIUrl":"https://doi.org/10.1080/09524622.2023.2204325","url":null,"abstract":"ABSTRACT Noise pollution contributes to the global biodiversity crisis, however the consequences of this pollution on anuran diversity patterns are poorly understood. This is especially true of less evident sources of noise like wind farms and highly exploited areas, as in the Brazilian semi-arid region. Here, we evaluated the influence of wind farm noise on anuran assemblages’ diversity at the Caatinga, a seasonal dry tropical forest in Brazil. We tested the hypothesis that wind farm noise negatively affects the diversity of anuran assemblages in terms of abundance, species richness and composition. Anurans were sampled in 19 temporary ponds along a noise gradient in two wind farms over a rainy season (March to August). A total of 2,047 individuals belonging to 20 species were recorded. Our results suggest that wind farm noise has a non-significant relationship with anuran diversity patterns (species richness, composition and abundance). To our knowledge, this is the first investigation into the effects of wind farm noise on anuran assemblages in the Caatinga dry forest. Despite our results suggesting that anuran diversity is insensitive to noise pollution caused by wind farms, identification of emerging threats is essential to mitigate impacts on anuran populations which are declining globally.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43958535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-15DOI: 10.1080/09524622.2023.2211544
Connor M. Wood, Stefan Kahl, Stephanie Barnes, Rachel Van Horne, C. Brown
ABSTRACT Passive acoustic monitoring has proven effective for broad-scale population surveys of acoustically active species, making it a valuable tool for conserving threatened species. However, successful automated classification of anuran vocalisations in large audio datasets has been limited. We deployed five autonomous recording units at three known breeding areas of the Yosemite toad (Anaxyrus canorus), which is threatened and relatively uncommon, and the sympatric Pacific chorus frog (Pseudacris regilla), which is widespread and more common, to test the viability of bioacoustics as a means of supplementing ongoing, human survey efforts. We analysed the audio data with the BirdNET algorithm, which was originally developed for birds but has been expanded to include both species. We achieved efficient and accurate identification of both species in 2,756 h of audio, which yielded high-resolution phenological data about seasonal and daily vocal activity as well as daily detection counts. These findings demonstrate that a newly expanded machine learning detector, BirdNET, can effectively process passive acoustic surveys for these species. Further exploration of how passive acoustic monitoring may complement existing survey techniques for these and other Anurans is warranted.
{"title":"Passive acoustic surveys and the BirdNET algorithm reveal detailed spatiotemporal variation in the vocal activity of two anurans","authors":"Connor M. Wood, Stefan Kahl, Stephanie Barnes, Rachel Van Horne, C. Brown","doi":"10.1080/09524622.2023.2211544","DOIUrl":"https://doi.org/10.1080/09524622.2023.2211544","url":null,"abstract":"ABSTRACT Passive acoustic monitoring has proven effective for broad-scale population surveys of acoustically active species, making it a valuable tool for conserving threatened species. However, successful automated classification of anuran vocalisations in large audio datasets has been limited. We deployed five autonomous recording units at three known breeding areas of the Yosemite toad (Anaxyrus canorus), which is threatened and relatively uncommon, and the sympatric Pacific chorus frog (Pseudacris regilla), which is widespread and more common, to test the viability of bioacoustics as a means of supplementing ongoing, human survey efforts. We analysed the audio data with the BirdNET algorithm, which was originally developed for birds but has been expanded to include both species. We achieved efficient and accurate identification of both species in 2,756 h of audio, which yielded high-resolution phenological data about seasonal and daily vocal activity as well as daily detection counts. These findings demonstrate that a newly expanded machine learning detector, BirdNET, can effectively process passive acoustic surveys for these species. Further exploration of how passive acoustic monitoring may complement existing survey techniques for these and other Anurans is warranted.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41833966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-10DOI: 10.1080/09524622.2023.2209052
Sebastian Hoefer, D. T. McKnight, S. Allen‐Ankins, Eric J. Nordberg, L. Schwarzkopf
ABSTRACT Passive acoustic monitoring (PAM) has become increasingly popular in ecological studies, but its efficacy for assessing overall terrestrial vertebrate biodiversity is unclear. To quantify this, its performance for species detection must be directly compared to that obtained using traditional observer-based monitoring (OBM). Here, we review such comparisons across all major terrestrial vertebrate classes and identify factors impacting PAM performance. From 41 studies, we found that while PAM-OBM comparisons have been made for all major terrestrial vertebrate classes, most comparisons have focused on birds (65%) in North America (52%). PAM performed equally well or better (61%) compared to OBM in general. We found no statistical difference between the methods for total number of species detected across all vertebrate classes (excluding reptiles); however, recording period and region of study influenced the relative performance of PAM, while acoustic analysis method and which method sampled for longer overall showed no impact. Further studies comparing PAM performance in non-avian vertebrates using standardised methods are needed to investigate in more detail the factors that may influence PAM performance. While PAM is a valuable tool for vertebrate surveys, a combined approach with targeted OBM for non-vocal species should achieve the most comprehensive assessment of terrestrial vertebrate communities.
{"title":"Passive acoustic monitoring in terrestrial vertebrates: a review","authors":"Sebastian Hoefer, D. T. McKnight, S. Allen‐Ankins, Eric J. Nordberg, L. Schwarzkopf","doi":"10.1080/09524622.2023.2209052","DOIUrl":"https://doi.org/10.1080/09524622.2023.2209052","url":null,"abstract":"ABSTRACT Passive acoustic monitoring (PAM) has become increasingly popular in ecological studies, but its efficacy for assessing overall terrestrial vertebrate biodiversity is unclear. To quantify this, its performance for species detection must be directly compared to that obtained using traditional observer-based monitoring (OBM). Here, we review such comparisons across all major terrestrial vertebrate classes and identify factors impacting PAM performance. From 41 studies, we found that while PAM-OBM comparisons have been made for all major terrestrial vertebrate classes, most comparisons have focused on birds (65%) in North America (52%). PAM performed equally well or better (61%) compared to OBM in general. We found no statistical difference between the methods for total number of species detected across all vertebrate classes (excluding reptiles); however, recording period and region of study influenced the relative performance of PAM, while acoustic analysis method and which method sampled for longer overall showed no impact. Further studies comparing PAM performance in non-avian vertebrates using standardised methods are needed to investigate in more detail the factors that may influence PAM performance. While PAM is a valuable tool for vertebrate surveys, a combined approach with targeted OBM for non-vocal species should achieve the most comprehensive assessment of terrestrial vertebrate communities.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48193142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-27DOI: 10.1080/09524622.2023.2204313
Marina Vieira da Rosa, Miquéias Ferrão, Pedro Pequeno, A. Lima
ABSTRACT The Acoustic Adaptation Hypothesis (AAH) predicts that acoustic signals emitted at sites with greater vegetation density should have spectral and temporal characteristics that increase signal transmission, but there is a pleiotropism related to body size: large animals produce signals with lower frequency. We used 238 advertisement calls of 34 populations of Amazonian nurse frogs from two Amazonian rainforests with different vegetation density to test if tree density influences the evolution of acoustic parameters. We used PGLS to test for relationships between acoustic traits and phenotypic, environmental and geographic predictors. Spectral and temporal features of calls have an allometric relationship with body size. We found a novel quadratic relationship between note duration and body size. The allometric relationship between dominant frequency and body size and a direct effect of tree density indicates that the evolutionary trajectories of Amazonian nurse frogs follow a general macro-evolutionary pattern as in birds. The temporal features of calls have opposite evolutionary trajectories to those predicted by AAH; frogs from lower tree density environments emit longer notes and have higher note rates than those from denser-tree environments. Subtle differences between Amazonian forest types can drive acoustic diversification of temporal and spectral features of calls at micro-evolutionary scales.
{"title":"How do tree density and body size influence acoustic signals in Amazonian nurse frogs?","authors":"Marina Vieira da Rosa, Miquéias Ferrão, Pedro Pequeno, A. Lima","doi":"10.1080/09524622.2023.2204313","DOIUrl":"https://doi.org/10.1080/09524622.2023.2204313","url":null,"abstract":"ABSTRACT The Acoustic Adaptation Hypothesis (AAH) predicts that acoustic signals emitted at sites with greater vegetation density should have spectral and temporal characteristics that increase signal transmission, but there is a pleiotropism related to body size: large animals produce signals with lower frequency. We used 238 advertisement calls of 34 populations of Amazonian nurse frogs from two Amazonian rainforests with different vegetation density to test if tree density influences the evolution of acoustic parameters. We used PGLS to test for relationships between acoustic traits and phenotypic, environmental and geographic predictors. Spectral and temporal features of calls have an allometric relationship with body size. We found a novel quadratic relationship between note duration and body size. The allometric relationship between dominant frequency and body size and a direct effect of tree density indicates that the evolutionary trajectories of Amazonian nurse frogs follow a general macro-evolutionary pattern as in birds. The temporal features of calls have opposite evolutionary trajectories to those predicted by AAH; frogs from lower tree density environments emit longer notes and have higher note rates than those from denser-tree environments. Subtle differences between Amazonian forest types can drive acoustic diversification of temporal and spectral features of calls at micro-evolutionary scales.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47200511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-20DOI: 10.1080/09524622.2023.2197863
D. Bohnenstiehl
ABSTRACT The American silver perch (Bairdiella chrysoura) is a numerically dominant and ecologically important species found throughout coastal habitats along the eastern United States and Gulf of Mexico. During spawning in the spring and summer, male silver perch produce distinctive knocking sounds to attract females. These sounds are readily identifiable through aural and visual analysis of underwater acoustic recordings, providing a means to track the distribution and spawning activity of these fish. However, as the volume of passive acoustic datasets grows, there is an essential need to automate the process of cataloguing silver perch vocalisations. The approach presented here utilises a (1) detection stage, where candidate calls are identified based on the properties of signal kurtosis and signal-to-noise ratio, (2) a feature extraction stage where layer activations are returned from the pre-trained ResNet-50 convolutional neural network operating on a wavelet scalogram of these signals, and (3) a one-vs-all support-vector-machine classifier. The labelled data used to build the classifier consists of 6000 perch calls and 6000 other signals that sample diverse acoustic conditions within the Pamlico Sound estuary, USA. The model accuracy is 98.9%, and the accompanying software provides an efficient tool to investigate silver perch calling patterns within passive acoustic data.
{"title":"Automated cataloguing of American silver perch (Bairdiella chrysoura) calls using machine learning","authors":"D. Bohnenstiehl","doi":"10.1080/09524622.2023.2197863","DOIUrl":"https://doi.org/10.1080/09524622.2023.2197863","url":null,"abstract":"ABSTRACT The American silver perch (Bairdiella chrysoura) is a numerically dominant and ecologically important species found throughout coastal habitats along the eastern United States and Gulf of Mexico. During spawning in the spring and summer, male silver perch produce distinctive knocking sounds to attract females. These sounds are readily identifiable through aural and visual analysis of underwater acoustic recordings, providing a means to track the distribution and spawning activity of these fish. However, as the volume of passive acoustic datasets grows, there is an essential need to automate the process of cataloguing silver perch vocalisations. The approach presented here utilises a (1) detection stage, where candidate calls are identified based on the properties of signal kurtosis and signal-to-noise ratio, (2) a feature extraction stage where layer activations are returned from the pre-trained ResNet-50 convolutional neural network operating on a wavelet scalogram of these signals, and (3) a one-vs-all support-vector-machine classifier. The labelled data used to build the classifier consists of 6000 perch calls and 6000 other signals that sample diverse acoustic conditions within the Pamlico Sound estuary, USA. The model accuracy is 98.9%, and the accompanying software provides an efficient tool to investigate silver perch calling patterns within passive acoustic data.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47670180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-19DOI: 10.1080/09524622.2023.2197868
Angela M. Mendoza-Henao, Orlando Acevedo‐Charry, Daniela Martínez-Medina, Eliana Barona-Cortés, Sergio Córdoba-Córdoba, Paula C. Caycedo-Rosales, J. Ulloa, K. Borja-Acosta, Alexandra Buitrago-Cardona, Hoover Pantoja-Sánchez
ABSTRACT Digital bioacoustic collections preserve important behavioural and ecological traits, as well as trackable evidence of the presence of species in space and time. Well-structured and open-source repositories provide valuable information for science and biodiversity conservation. Here, we introduce the Environmental Sound Collection – ‘Mauricio Álvarez-Rebolledo’ (Colección de Sonidos Ambientales IAvH-CSA) at Instituto Humboldt in Colombia, which is one of the most relevant natural sound repositories in South America. The collection was founded in 1998 as ‘Banco de Sonidos Animales (BSA)’ to document Colombian biodiversity and guide conservation actions, two aims that remain at the forefront of our daily work. After over 25 years, the collection has preserved more than 25,000 audio specimens from over 1,300 species. Here, we highlight the value of sound collections by presenting a historical overview of our collection and providing examples of its role in research and outreach. We also identify taxonomic and geographical gaps that need to be filled, analyse the impact of new technological advances on sound collections, and discuss the critical role of acoustics in the future of research and biodiversity conservation programmes.
数字生物声学收集保存了重要的行为和生态特征，以及物种在空间和时间上存在的可追踪证据。结构良好的开源资源库为科学和生物多样性保护提供了有价值的信息。在这里，我们介绍哥伦比亚洪堡研究所的环境声音收集-“毛里西奥Álvarez-Rebolledo”(Colección de Sonidos Ambientales IAvH-CSA)，这是南美洲最相关的自然声音库之一。该收藏成立于1998年，名为“Sonidos Animales银行(BSA)”，旨在记录哥伦比亚的生物多样性并指导保护行动，这两个目标仍然是我们日常工作的首要目标。经过25年多的时间，该馆藏保存了来自1300多个物种的25000多个音频标本。在这里，我们通过展示我们的收藏的历史概述，并提供其在研究和推广中的作用的例子，强调声音收藏的价值。我们还确定了需要填补的分类和地理空白，分析了新技术进步对声音收集的影响，并讨论了声学在未来研究和生物多样性保护计划中的关键作用。
{"title":"Past, present, and future of a tropical sounds collection from Colombia","authors":"Angela M. Mendoza-Henao, Orlando Acevedo‐Charry, Daniela Martínez-Medina, Eliana Barona-Cortés, Sergio Córdoba-Córdoba, Paula C. Caycedo-Rosales, J. Ulloa, K. Borja-Acosta, Alexandra Buitrago-Cardona, Hoover Pantoja-Sánchez","doi":"10.1080/09524622.2023.2197868","DOIUrl":"https://doi.org/10.1080/09524622.2023.2197868","url":null,"abstract":"ABSTRACT Digital bioacoustic collections preserve important behavioural and ecological traits, as well as trackable evidence of the presence of species in space and time. Well-structured and open-source repositories provide valuable information for science and biodiversity conservation. Here, we introduce the Environmental Sound Collection – ‘Mauricio Álvarez-Rebolledo’ (Colección de Sonidos Ambientales IAvH-CSA) at Instituto Humboldt in Colombia, which is one of the most relevant natural sound repositories in South America. The collection was founded in 1998 as ‘Banco de Sonidos Animales (BSA)’ to document Colombian biodiversity and guide conservation actions, two aims that remain at the forefront of our daily work. After over 25 years, the collection has preserved more than 25,000 audio specimens from over 1,300 species. Here, we highlight the value of sound collections by presenting a historical overview of our collection and providing examples of its role in research and outreach. We also identify taxonomic and geographical gaps that need to be filled, analyse the impact of new technological advances on sound collections, and discuss the critical role of acoustics in the future of research and biodiversity conservation programmes.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59483089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-30DOI: 10.1080/09524622.2023.2193815
B. Reeves, W. Conradie
ABSTRACT Given the potential impact of climate change on amphibians, there is a need to establish baseline phenological data for vulnerable species and to investigate their responses to changing climatic conditions. We recorded vocalisations of Hewitt’s ghost frog Heleophryne hewitti in the Baviaanskloof World Heritage Site, South Africa, to investigate its breeding phenology and vocalisation behaviour. Our objectives were to: 1) characterise seasonal and diel vocalisation patterns, 2) examine relationships between environmental variables and calling behaviour and 3) evaluate the effectiveness of acoustic recording as a monitoring technique. We employed automatic vocalisation recognition software to detect calls and used hurdle regression to model the relationships between environmental variables and the number of calls produced. Our study confirmed that H. hewitti is a seasonal prolonged breeder, with reproductive activity occurring from early to late spring. We found that while relative humidity seemed to influence the probability of calling, none of the weather variables appeared to have a strong influence on the number of calls produced. Acoustic monitoring combined with automatic vocalisation recognition has proven to be a viable technique for monitoring this species. Further investigation of cues for breeding initiation is required to understand the impacts of climate change on this species.
{"title":"Breeding phenology and behaviour of the Endangered Hewitt’s ghost frog Heleophryne hewitti in the Baviaanskloof World Heritage Site, Eastern Cape Province, South Africa","authors":"B. Reeves, W. Conradie","doi":"10.1080/09524622.2023.2193815","DOIUrl":"https://doi.org/10.1080/09524622.2023.2193815","url":null,"abstract":"ABSTRACT Given the potential impact of climate change on amphibians, there is a need to establish baseline phenological data for vulnerable species and to investigate their responses to changing climatic conditions. We recorded vocalisations of Hewitt’s ghost frog Heleophryne hewitti in the Baviaanskloof World Heritage Site, South Africa, to investigate its breeding phenology and vocalisation behaviour. Our objectives were to: 1) characterise seasonal and diel vocalisation patterns, 2) examine relationships between environmental variables and calling behaviour and 3) evaluate the effectiveness of acoustic recording as a monitoring technique. We employed automatic vocalisation recognition software to detect calls and used hurdle regression to model the relationships between environmental variables and the number of calls produced. Our study confirmed that H. hewitti is a seasonal prolonged breeder, with reproductive activity occurring from early to late spring. We found that while relative humidity seemed to influence the probability of calling, none of the weather variables appeared to have a strong influence on the number of calls produced. Acoustic monitoring combined with automatic vocalisation recognition has proven to be a viable technique for monitoring this species. Further investigation of cues for breeding initiation is required to understand the impacts of climate change on this species.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43387916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-21DOI: 10.1080/09524622.2023.2189164
T. L. Andreani, R. Bastos, M. N. Siqueira, W. P. Ramalho, Alessandro Ribeiro de Morais
ABSTRACT During the breeding season, hundreds of anurans agglomerate at spawning sites, where a diversity of social contexts arise. In this scenario, anurans may alter their vocal repertoire according to the immediate social context, to overcome intraspecific competition. To evaluate the acoustic response of Boana goiana to successive interactions with a conspecific competitor, the present study was based on comparing the repetition rates of advertisement and aggressive calls of B. goiana focal males exposure to repeated artificial advertisement calls in 10 playback sessions. We observed that B. goiana males altered their acoustic behaviour in response to the simulated arrival of a new competitor. Males emitted less advertisement calls and more aggressive calls with the arrival of the competitors. Temperature and body condition were not important predictors of continuity of males in the experiment or the call repetition rates in the pre-playback session. However, the body condition influenced the total delta advertisement calls (differences in the call rate emission between end and the beginning of the experiment), indicating that higher values of body conditions allow males to show smaller reductions in the emission of advertisement calls over time in the presence of a competitor.
{"title":"Acoustic plasticity in Boana goiana (Lutz, 1968) (Anura, Hylidae): how males respond to successive interactions with conspecific competitors","authors":"T. L. Andreani, R. Bastos, M. N. Siqueira, W. P. Ramalho, Alessandro Ribeiro de Morais","doi":"10.1080/09524622.2023.2189164","DOIUrl":"https://doi.org/10.1080/09524622.2023.2189164","url":null,"abstract":"ABSTRACT During the breeding season, hundreds of anurans agglomerate at spawning sites, where a diversity of social contexts arise. In this scenario, anurans may alter their vocal repertoire according to the immediate social context, to overcome intraspecific competition. To evaluate the acoustic response of Boana goiana to successive interactions with a conspecific competitor, the present study was based on comparing the repetition rates of advertisement and aggressive calls of B. goiana focal males exposure to repeated artificial advertisement calls in 10 playback sessions. We observed that B. goiana males altered their acoustic behaviour in response to the simulated arrival of a new competitor. Males emitted less advertisement calls and more aggressive calls with the arrival of the competitors. Temperature and body condition were not important predictors of continuity of males in the experiment or the call repetition rates in the pre-playback session. However, the body condition influenced the total delta advertisement calls (differences in the call rate emission between end and the beginning of the experiment), indicating that higher values of body conditions allow males to show smaller reductions in the emission of advertisement calls over time in the presence of a competitor.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45791808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-27DOI: 10.1080/09524622.2023.2177887
M. Tan, Zhu-Qing He, S. Ingrisch
ABSTRACT The scaly crickets, Mogoplistinae, form a monophyletic group of crickets and are characterised by scales covering the integument. In many species, males have modified forewings for producing highly tonal calling songs. Despite being a highly speciose and abundant group of orthopterans in tropical forests, data on their calling songs and studies on their bioacoustics remain scanty. In this study, we recorded and described the calling songs of seven sympatric scaly cricket species belonging to three genera—Cycloptiloides, Ectatoderus and Ornebius—from Singapore. We compared call structure and call parameters of syntopic species occurring together in the same locality within Singapore and found that syntopic congeners exhibit acoustic partitioning to avoid inter-specific competition for the acoustic space. We also found that calling songs can be highly varied among congeners and species from the same species groups. Finally, we also observed that syllable duration and peak frequency exhibit vastly different allometric relationships with body size. Larger scaly cricket species bear disproportionately longer syllable duration, but not differences in peak frequency.
{"title":"A study on the bioacoustics of Oriental scaly crickets (Orthoptera: Mogoplistinae), with a focus on Singaporean species","authors":"M. Tan, Zhu-Qing He, S. Ingrisch","doi":"10.1080/09524622.2023.2177887","DOIUrl":"https://doi.org/10.1080/09524622.2023.2177887","url":null,"abstract":"ABSTRACT The scaly crickets, Mogoplistinae, form a monophyletic group of crickets and are characterised by scales covering the integument. In many species, males have modified forewings for producing highly tonal calling songs. Despite being a highly speciose and abundant group of orthopterans in tropical forests, data on their calling songs and studies on their bioacoustics remain scanty. In this study, we recorded and described the calling songs of seven sympatric scaly cricket species belonging to three genera—Cycloptiloides, Ectatoderus and Ornebius—from Singapore. We compared call structure and call parameters of syntopic species occurring together in the same locality within Singapore and found that syntopic congeners exhibit acoustic partitioning to avoid inter-specific competition for the acoustic space. We also found that calling songs can be highly varied among congeners and species from the same species groups. Finally, we also observed that syllable duration and peak frequency exhibit vastly different allometric relationships with body size. Larger scaly cricket species bear disproportionately longer syllable duration, but not differences in peak frequency.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47337132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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