Pub Date : 2021-05-27DOI: 10.1080/09524622.2021.1929488
Lucimary S. Deconto, T. C. Freitas, A. Guaraldo, Dalila T. Leão, F. L. Silva, E.L.A. Monteiro-Filho
ABSTRACT This study aims to determine the influence of distance and environmental parameters of water on Sotalia guianensis sounds. We used recordings of three distinct vocalisations for testing their propagation in places with different environmental characteristics in the Northeast and Southeast of Brazil. We observed that the propagation of all the sounds tested depended on the distance, turbidity, and concentration of oxygen dissolved in the water. Relative amplitude data for each sampled distance were smaller than the values predicted by the cylindrical spreading law. This result indicates that there are probably other factors that can influence sound propagation besides the distance in the sampled areas. The relative amplitude was also proportionally higher when there were lower levels of turbidity and higher concentration of dissolved oxygen in the water. From the data presented here, a model was generated that can be used as a tool to predict acoustic alterations of the environment against natural or anthropic changes in salinity, dissolved oxygen, and water turbidity. In addition, the methodology of this study is an important tool for conservation studies, for it can be replicated in other areas and with other species.
{"title":"Propagation of Guiana dolphin sounds in their habitat: measured transmission loss and influence of environmental factors","authors":"Lucimary S. Deconto, T. C. Freitas, A. Guaraldo, Dalila T. Leão, F. L. Silva, E.L.A. Monteiro-Filho","doi":"10.1080/09524622.2021.1929488","DOIUrl":"https://doi.org/10.1080/09524622.2021.1929488","url":null,"abstract":"ABSTRACT This study aims to determine the influence of distance and environmental parameters of water on Sotalia guianensis sounds. We used recordings of three distinct vocalisations for testing their propagation in places with different environmental characteristics in the Northeast and Southeast of Brazil. We observed that the propagation of all the sounds tested depended on the distance, turbidity, and concentration of oxygen dissolved in the water. Relative amplitude data for each sampled distance were smaller than the values predicted by the cylindrical spreading law. This result indicates that there are probably other factors that can influence sound propagation besides the distance in the sampled areas. The relative amplitude was also proportionally higher when there were lower levels of turbidity and higher concentration of dissolved oxygen in the water. From the data presented here, a model was generated that can be used as a tool to predict acoustic alterations of the environment against natural or anthropic changes in salinity, dissolved oxygen, and water turbidity. In addition, the methodology of this study is an important tool for conservation studies, for it can be replicated in other areas and with other species.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09524622.2021.1929488","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43449984","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 : 2021-05-19DOI: 10.1080/09524622.2021.1925589
Aileen C. van der Mescht, J. Pryke, R. Gaigher, M. Samways
ABSTRACT Soundscape comprises of a mix of species-specific calls, where individuals compete for acoustic space, yet a different vegetation structure allows for differential call filtration. We focus on an assemblage of bush cricket species in a human-transformed landscape, with a special focus on the seemingly endangered Thoracistus thyraeus. Landscape transformation produces both novel ecological and acoustic spaces in which species must maintain effective communication. Using acoustic activity and species’ total call times to characterise their response to the different biotopes in the landscape, we determine how species are distributed across the landscape to optimise ecological and acoustic space. We further investigate the distribution of occupied frequency bands to determine whether species are exposed to potential acoustic interference from other sympatric species. We identified 11 bush cricket species and hypothesised that where acoustic interference between species is likely; the different species will be found in different biotopes. We found that acoustic interference between species is low as species co-exist by having distinct ecological resource requirements and inhabit different biotopes, thus preventing acoustic interference from other species. Acoustic and environmental factors play interactive roles in enabling sympatric species to co-exist across complex landscapes, illustrating that these insects can co-exist without acoustic interference.
{"title":"Sympatric bush cricket species co-exist across a complex landscape by optimising both acoustic and ecological space","authors":"Aileen C. van der Mescht, J. Pryke, R. Gaigher, M. Samways","doi":"10.1080/09524622.2021.1925589","DOIUrl":"https://doi.org/10.1080/09524622.2021.1925589","url":null,"abstract":"ABSTRACT Soundscape comprises of a mix of species-specific calls, where individuals compete for acoustic space, yet a different vegetation structure allows for differential call filtration. We focus on an assemblage of bush cricket species in a human-transformed landscape, with a special focus on the seemingly endangered Thoracistus thyraeus. Landscape transformation produces both novel ecological and acoustic spaces in which species must maintain effective communication. Using acoustic activity and species’ total call times to characterise their response to the different biotopes in the landscape, we determine how species are distributed across the landscape to optimise ecological and acoustic space. We further investigate the distribution of occupied frequency bands to determine whether species are exposed to potential acoustic interference from other sympatric species. We identified 11 bush cricket species and hypothesised that where acoustic interference between species is likely; the different species will be found in different biotopes. We found that acoustic interference between species is low as species co-exist by having distinct ecological resource requirements and inhabit different biotopes, thus preventing acoustic interference from other species. Acoustic and environmental factors play interactive roles in enabling sympatric species to co-exist across complex landscapes, illustrating that these insects can co-exist without acoustic interference.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09524622.2021.1925589","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46488313","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 : 2021-05-12DOI: 10.1080/09524622.2021.1921618
M. Penna, R. Solís, F. N. Moreno‐Gómez
ABSTRACT Phonotactic female and vocal male responses of frogs to advertisement calls have been shown to encompass broader ranges than those of variation of natural mate-attracting signals. Anuran aggressive calls contribute to expand the range of sound features significant for communication. Evoked vocal responses (EVRs) of males of Batrachyla leptopus to synthetic advertisement calls and variants with different temporal features altered parametrically were studied to assess their correspondence with features of natural signals. Frogs responded to stimuli differing in note rate with vocal patterns that depended on the design of the synthetic sounds: lower call rates were obtained with stimuli composed of notes with linear rise-fall times deviating from the average of this parameter for natural calls. However, opposite results were obtained with stimuli composed of sinusoidally amplitude-modulated notes. Calls of longer duration resembling aggressive calls were emitted in response to low note rate sinusoidal stimuli. Stimuli with note durations above and below the natural average, stimuli having low pulse rates and a continuous tone also elicited longer calls of aggressive type. These patterns relate the vocal responses recorded to recognition of conspecific and heterospecific advertisement and aggressive calls, as well as to novel signal features.
{"title":"Diverse patterns of responsiveness to fine temporal features of acoustic signals in a temperate austral forest frog, Batrachyla leptopus (Batrachylidae)","authors":"M. Penna, R. Solís, F. N. Moreno‐Gómez","doi":"10.1080/09524622.2021.1921618","DOIUrl":"https://doi.org/10.1080/09524622.2021.1921618","url":null,"abstract":"ABSTRACT Phonotactic female and vocal male responses of frogs to advertisement calls have been shown to encompass broader ranges than those of variation of natural mate-attracting signals. Anuran aggressive calls contribute to expand the range of sound features significant for communication. Evoked vocal responses (EVRs) of males of Batrachyla leptopus to synthetic advertisement calls and variants with different temporal features altered parametrically were studied to assess their correspondence with features of natural signals. Frogs responded to stimuli differing in note rate with vocal patterns that depended on the design of the synthetic sounds: lower call rates were obtained with stimuli composed of notes with linear rise-fall times deviating from the average of this parameter for natural calls. However, opposite results were obtained with stimuli composed of sinusoidally amplitude-modulated notes. Calls of longer duration resembling aggressive calls were emitted in response to low note rate sinusoidal stimuli. Stimuli with note durations above and below the natural average, stimuli having low pulse rates and a continuous tone also elicited longer calls of aggressive type. These patterns relate the vocal responses recorded to recognition of conspecific and heterospecific advertisement and aggressive calls, as well as to novel signal features.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09524622.2021.1921618","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48687619","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 : 2021-05-10DOI: 10.1080/09524622.2021.1921617
D. R. Brooks, J. Nocera
ABSTRACT Autonomous Recording Units (ARUs) are commonly used, alongside traditional methods, to study the presence/absence of vocal species. ARUs are useful in monitoring species that are secretive or vocalise at night. We endeavoured to develop a method to monitor avian reproductive activity using ARUs. Olive-sided flycatchers (Contopus cooperi), an at-risk passerine, are an ideal species with which to develop this method as they have a loud distinct call and have large territories without much intrusion from conspecifics. Olive-sided flycatchers have a distinct call pattern during the breeding season. We used a change-point analysis to determine the dates of significant changes in their call pattern to determine if individuals were successfully breeding. We monitored 22 Olive-sided flycatchers in central New Brunswick in 2018 and 2019. We found that using a combination of ARUs and change-point analyses was a viable method for studying reproductive activity of Olive-sided flycatchers. We found that 27% of Olive-sided flycatchers were successfully breeding which, when considering erroneous classifications, is within the range of nest success (30–65%) documented elsewhere. Our method shows promise for studying other bird species as well as other vocal non-avian species.
{"title":"Using autonomous recording units and change-point analysis to determine reproductive activity in an aerial insectivore","authors":"D. R. Brooks, J. Nocera","doi":"10.1080/09524622.2021.1921617","DOIUrl":"https://doi.org/10.1080/09524622.2021.1921617","url":null,"abstract":"ABSTRACT Autonomous Recording Units (ARUs) are commonly used, alongside traditional methods, to study the presence/absence of vocal species. ARUs are useful in monitoring species that are secretive or vocalise at night. We endeavoured to develop a method to monitor avian reproductive activity using ARUs. Olive-sided flycatchers (Contopus cooperi), an at-risk passerine, are an ideal species with which to develop this method as they have a loud distinct call and have large territories without much intrusion from conspecifics. Olive-sided flycatchers have a distinct call pattern during the breeding season. We used a change-point analysis to determine the dates of significant changes in their call pattern to determine if individuals were successfully breeding. We monitored 22 Olive-sided flycatchers in central New Brunswick in 2018 and 2019. We found that using a combination of ARUs and change-point analyses was a viable method for studying reproductive activity of Olive-sided flycatchers. We found that 27% of Olive-sided flycatchers were successfully breeding which, when considering erroneous classifications, is within the range of nest success (30–65%) documented elsewhere. Our method shows promise for studying other bird species as well as other vocal non-avian species.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09524622.2021.1921617","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41608702","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 : 2021-04-19DOI: 10.1080/09524622.2021.1905065
Sasha L. Winkler, G. Bryant
ABSTRACT Complex social play is well-documented across many animals. During play, animals often use signals that facilitate beneficial interactions and reduce potential costs, such as escalation to aggression. Although greater focus has been given to visual play signals, here we demonstrate that vocalisations constitute a widespread mode of play signalling across species. Our review indicates that vocal play signals are usually inconspicuous, although loud vocalisations, which suggest a broadcast function, are present in humans and some other species. Spontaneous laughter in humans shares acoustic and functional characteristics with play vocalisations across many species, but most notably with other great apes. Play vocalisations in primates and other mammals often include sounds of panting, supporting the theory that human laughter evolved from an auditory cue of laboured breathing during play. Human social complexity allowed laughter to evolve from a play-specific vocalisation into a sophisticated pragmatic signal that interacts with a large suite of other multimodal social behaviours in both intragroup and intergroup contexts. This review provides a foundation for detailed comparative analyses of play vocalisations across diverse taxa, which can shed light on the form and function of human laughter and, in turn, help us better understand the evolution of human social interaction.
{"title":"Play vocalisations and human laughter: a comparative review","authors":"Sasha L. Winkler, G. Bryant","doi":"10.1080/09524622.2021.1905065","DOIUrl":"https://doi.org/10.1080/09524622.2021.1905065","url":null,"abstract":"ABSTRACT Complex social play is well-documented across many animals. During play, animals often use signals that facilitate beneficial interactions and reduce potential costs, such as escalation to aggression. Although greater focus has been given to visual play signals, here we demonstrate that vocalisations constitute a widespread mode of play signalling across species. Our review indicates that vocal play signals are usually inconspicuous, although loud vocalisations, which suggest a broadcast function, are present in humans and some other species. Spontaneous laughter in humans shares acoustic and functional characteristics with play vocalisations across many species, but most notably with other great apes. Play vocalisations in primates and other mammals often include sounds of panting, supporting the theory that human laughter evolved from an auditory cue of laboured breathing during play. Human social complexity allowed laughter to evolve from a play-specific vocalisation into a sophisticated pragmatic signal that interacts with a large suite of other multimodal social behaviours in both intragroup and intergroup contexts. This review provides a foundation for detailed comparative analyses of play vocalisations across diverse taxa, which can shed light on the form and function of human laughter and, in turn, help us better understand the evolution of human social interaction.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09524622.2021.1905065","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41957653","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 : 2021-04-14DOI: 10.1080/09524622.2021.1899987
Maria Carolina Rodella Manzano, Daniel Garcia Chagas, Julia Montenegro de Sena Ferreira, R. J. Sawaya, Diego Llusia
ABSTRACT Phylogenetic inertia often drives sister species to exhibit similar acoustic signals, compromising species recognition and increasing competition for acoustic space. Consequently, natural selection favours acoustic divergence in sympatry through behavioural plasticity or character displacement. Although well-documented in temperate regions, these phenomena have been less investigated in tropical communities, characterised by more complex interactions and saturated acoustic spaces. Here we examined acoustic divergence in the advertisement calls of two closely related neotropical treefrogs that share similar signals, habitat, and phenology, and that hybridise in nature. Our results revealed differences in call parameters between syntopy and allotopy, each species showing a specific response. While the smaller-sized species, Boana bischoffi, increased dominant frequency in syntopy, Boana prasina prolonged call duration, both increasing acoustic divergence between these sister species. In contrast, morphological and environmental factors had little influence on acoustic parameters, with only body size affecting dominant frequency in B. bischoffi. These findings suggest that vocal adjustment (acoustic plasticity) or character displacement (local adaptation) may enlarge acoustic divergence in advertisement calls, reinforcing reproductive isolation and reducing interspecific competition for acoustic space in sister taxa.
{"title":"Reinforced acoustic divergence in two syntopic neotropical treefrogs","authors":"Maria Carolina Rodella Manzano, Daniel Garcia Chagas, Julia Montenegro de Sena Ferreira, R. J. Sawaya, Diego Llusia","doi":"10.1080/09524622.2021.1899987","DOIUrl":"https://doi.org/10.1080/09524622.2021.1899987","url":null,"abstract":"ABSTRACT Phylogenetic inertia often drives sister species to exhibit similar acoustic signals, compromising species recognition and increasing competition for acoustic space. Consequently, natural selection favours acoustic divergence in sympatry through behavioural plasticity or character displacement. Although well-documented in temperate regions, these phenomena have been less investigated in tropical communities, characterised by more complex interactions and saturated acoustic spaces. Here we examined acoustic divergence in the advertisement calls of two closely related neotropical treefrogs that share similar signals, habitat, and phenology, and that hybridise in nature. Our results revealed differences in call parameters between syntopy and allotopy, each species showing a specific response. While the smaller-sized species, Boana bischoffi, increased dominant frequency in syntopy, Boana prasina prolonged call duration, both increasing acoustic divergence between these sister species. In contrast, morphological and environmental factors had little influence on acoustic parameters, with only body size affecting dominant frequency in B. bischoffi. These findings suggest that vocal adjustment (acoustic plasticity) or character displacement (local adaptation) may enlarge acoustic divergence in advertisement calls, reinforcing reproductive isolation and reducing interspecific competition for acoustic space in sister taxa.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09524622.2021.1899987","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47662611","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 : 2021-04-14DOI: 10.1080/09524622.2021.1910568
A. Opaev, Y. Kolesnikova
ABSTRACT In many songbird species, individuals sing multiple song types, some of which are shared between neighbours. Individuals may also share transitions between different song types, which leads to sharing sequencies of several (usually few) song types. Song themes, i.e. groups of song types that are consistently delivered in close succession, were identified in song sequences of several bird species. Detailed data on song theme sharing are still lacking. Here, we examined patterns of repertoire sharing in the Grey-crowned Warbler Phylloscopus tephrocephalus. Males of this species had repertoires of 29–42 song types that were divided into shorter song themes of up to 10–15 song types each. Each of the 13 studied males shared 81.6–100% of his repertoire as well as several song themes with other males. These themes recombined in different ways leading to the fact that exact song sequencing varied between individuals. That is why males shared much less transition types than song types in our study. Therefore, the analysis of song theme sharing may provide more careful description of sharing above the level of song type than the analysis of song sequence sharing alone.
{"title":"Song theme sharing in the Grey-crowned Warbler Phylloscopus tephrocephalus","authors":"A. Opaev, Y. Kolesnikova","doi":"10.1080/09524622.2021.1910568","DOIUrl":"https://doi.org/10.1080/09524622.2021.1910568","url":null,"abstract":"ABSTRACT In many songbird species, individuals sing multiple song types, some of which are shared between neighbours. Individuals may also share transitions between different song types, which leads to sharing sequencies of several (usually few) song types. Song themes, i.e. groups of song types that are consistently delivered in close succession, were identified in song sequences of several bird species. Detailed data on song theme sharing are still lacking. Here, we examined patterns of repertoire sharing in the Grey-crowned Warbler Phylloscopus tephrocephalus. Males of this species had repertoires of 29–42 song types that were divided into shorter song themes of up to 10–15 song types each. Each of the 13 studied males shared 81.6–100% of his repertoire as well as several song themes with other males. These themes recombined in different ways leading to the fact that exact song sequencing varied between individuals. That is why males shared much less transition types than song types in our study. Therefore, the analysis of song theme sharing may provide more careful description of sharing above the level of song type than the analysis of song sequence sharing alone.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09524622.2021.1910568","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42566405","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 : 2021-04-07DOI: 10.1080/09524622.2021.1904443
M. T. T. Santos, Izabela M. Barata, Rodrigo B. Ferreira, C. Haddad, M. Gridi-Papp, Thiago R. de Carvalho
ABSTRACT Vocal sounds occur in most anurans and are often emitted as simple and stereotyped acoustic signals. Some frog groups, however, have complex signals and others can produce distinctive acoustic structures, such as purely ultrasonic calls. Crossodactylodes is a genus of bromeligenous frogs that is understudied in many aspects. This genus has been historically regarded as voiceless, but recent studies reported briefly on vocal sounds in two species. Here, we provide the first quantitative description of vocalisations of Crossodactylodes frogs and describe the vocal repertoires of three species. Vocalisations are formed of up to three call types, reported herein as creaking, chirp and squeak calls. We discuss the major call patterns and the repertoire of Crossodactylodes. We also discuss the evolutionary and functional implications of the low-intensity calls produced at the water–air interface inside bromeliads. The absence of some morphological structures normally involved in sound reception (elements of the middle ear) in Crossodactylodes frogs indicates that extratympanic pathways might be the main auditory route in these highly specialised leptodactylids.
{"title":"Complex acoustic signals in Crossodactylodes (Leptodactylidae, Paratelmatobiinae): a frog genus historically regarded as voiceless","authors":"M. T. T. Santos, Izabela M. Barata, Rodrigo B. Ferreira, C. Haddad, M. Gridi-Papp, Thiago R. de Carvalho","doi":"10.1080/09524622.2021.1904443","DOIUrl":"https://doi.org/10.1080/09524622.2021.1904443","url":null,"abstract":"ABSTRACT Vocal sounds occur in most anurans and are often emitted as simple and stereotyped acoustic signals. Some frog groups, however, have complex signals and others can produce distinctive acoustic structures, such as purely ultrasonic calls. Crossodactylodes is a genus of bromeligenous frogs that is understudied in many aspects. This genus has been historically regarded as voiceless, but recent studies reported briefly on vocal sounds in two species. Here, we provide the first quantitative description of vocalisations of Crossodactylodes frogs and describe the vocal repertoires of three species. Vocalisations are formed of up to three call types, reported herein as creaking, chirp and squeak calls. We discuss the major call patterns and the repertoire of Crossodactylodes. We also discuss the evolutionary and functional implications of the low-intensity calls produced at the water–air interface inside bromeliads. The absence of some morphological structures normally involved in sound reception (elements of the middle ear) in Crossodactylodes frogs indicates that extratympanic pathways might be the main auditory route in these highly specialised leptodactylids.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09524622.2021.1904443","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48636123","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 : 2021-04-05DOI: 10.1080/09524622.2021.1886170
D. Ong, S. Shahrudin
ABSTRACT Bioacoustics information is an essential tool for anuran identification, especially within cryptic species. Here we recorded and analysed 17 calls of a male Limnonectes macrognathus individual and 15 calls of a single male Leptobrachium smithi. A Limnonectes macrognathus individual was caught at Gunung Raya on 13 July 2019, and an individual of male Leptobrachium smithi was caught at Lubuk Semilang on 18 January 2019. These species are native of the Langkawi Archipelago. The calls of Limnonectes macrognathus are short trills while Leptobrachium smithi calls have a single high-pitched ‘Kwak’ call. The advertisement call of Limnonectes macrognathus consists of two types that are emitted at a rate of 1 to 4 calls per minute. Each call lasts for 28.18 ± 29.69 (8.45–131.08) seconds (means ± SD (minimum – maximum)). Leptobrachium smithi produced high-pitched calls which consist of an apparent ‘KWAK’ sound. The advertisement call of Leptobrachium smithi consists of a single-note which is emitted 4–6 times per minute. Each call lasts for 0.22 ± 0.01 (0.21–0.23) seconds.
{"title":"Advertisement calls of Limnonectes macrognathus (Anura: Dicroglossidae) and Leptobrachium smithi (Anura: Megophryidae), native frog species from Langkawi, Kedah, Peninsular Malaysia","authors":"D. Ong, S. Shahrudin","doi":"10.1080/09524622.2021.1886170","DOIUrl":"https://doi.org/10.1080/09524622.2021.1886170","url":null,"abstract":"ABSTRACT Bioacoustics information is an essential tool for anuran identification, especially within cryptic species. Here we recorded and analysed 17 calls of a male Limnonectes macrognathus individual and 15 calls of a single male Leptobrachium smithi. A Limnonectes macrognathus individual was caught at Gunung Raya on 13 July 2019, and an individual of male Leptobrachium smithi was caught at Lubuk Semilang on 18 January 2019. These species are native of the Langkawi Archipelago. The calls of Limnonectes macrognathus are short trills while Leptobrachium smithi calls have a single high-pitched ‘Kwak’ call. The advertisement call of Limnonectes macrognathus consists of two types that are emitted at a rate of 1 to 4 calls per minute. Each call lasts for 28.18 ± 29.69 (8.45–131.08) seconds (means ± SD (minimum – maximum)). Leptobrachium smithi produced high-pitched calls which consist of an apparent ‘KWAK’ sound. The advertisement call of Leptobrachium smithi consists of a single-note which is emitted 4–6 times per minute. Each call lasts for 0.22 ± 0.01 (0.21–0.23) seconds.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09524622.2021.1886170","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46920612","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 : 2021-03-26DOI: 10.1080/09524622.2021.1889403
I. Volodin, E. Volodina, M. Rutovskaya
ABSTRACT Among ruminants, some species of cervids, bovids and camelids are capable of producing very high-frequency (HF) calls potentially produced by the aerodynamic whistle mechanism. We analysed the HF calls of six individual adult captive camels: three male and one female two-humped Camelus bactrianus and one male and one female one-humped C. dromedarius. Context of emission differed between sexes and individuals. Males of both species vocalised when guarding females during the rut. Females of both species vocalised towards their mates, postpartum (female C. bactrianus) or when protesting against preventing locomotion over enclosure (female C. dromedarius). In either species or sex, the HF calls were faint tonal vocalisations slightly modulated in fundamental frequency (f0). Between species, the calls were significantly lower-frequency (1.7 ± 0.16 kHz) and longer (0.23 ± 0.08 s) in C. bactrianus than in C. dromedarius (3.12 ± 0.11 kHz; 0.16 ± 0.05 s). Nonlinear vocal phenomena (subharmonics and sidebands) occurred in both species but not in all individuals. We discuss the relationship of the f0 of the HF calls with body size and vocal fold length in ruminants. We conclude that the ‘whistling’ HF calls of C. dromedarius are the highest-frequency vocalisations in Artiodactyla.
{"title":"Camel whistling vocalisations: male and female call structure and context in Camelus bactrianus and Camelus dromedarius","authors":"I. Volodin, E. Volodina, M. Rutovskaya","doi":"10.1080/09524622.2021.1889403","DOIUrl":"https://doi.org/10.1080/09524622.2021.1889403","url":null,"abstract":"ABSTRACT Among ruminants, some species of cervids, bovids and camelids are capable of producing very high-frequency (HF) calls potentially produced by the aerodynamic whistle mechanism. We analysed the HF calls of six individual adult captive camels: three male and one female two-humped Camelus bactrianus and one male and one female one-humped C. dromedarius. Context of emission differed between sexes and individuals. Males of both species vocalised when guarding females during the rut. Females of both species vocalised towards their mates, postpartum (female C. bactrianus) or when protesting against preventing locomotion over enclosure (female C. dromedarius). In either species or sex, the HF calls were faint tonal vocalisations slightly modulated in fundamental frequency (f0). Between species, the calls were significantly lower-frequency (1.7 ± 0.16 kHz) and longer (0.23 ± 0.08 s) in C. bactrianus than in C. dromedarius (3.12 ± 0.11 kHz; 0.16 ± 0.05 s). Nonlinear vocal phenomena (subharmonics and sidebands) occurred in both species but not in all individuals. We discuss the relationship of the f0 of the HF calls with body size and vocal fold length in ruminants. We conclude that the ‘whistling’ HF calls of C. dromedarius are the highest-frequency vocalisations in Artiodactyla.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09524622.2021.1889403","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47499155","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：