Pub Date : 2022-02-23DOI: 10.1080/09524622.2022.2039295
Andrey Anikin, D. Reby
ABSTRACT Animals normally vocalise while exhaling. Ingressive, or inspiratory, voice production occurs in humans and many other species, but its communicative function, if any, remains unknown. To test the perceptual effects of ingressive phonation, naturally occurring ingressive syllables in 109 human nonverbal vocalisations (55 laughs, 21 cries, and 33 moans) were experimentally attenuated or morphed into quiet and unvoiced intakes of breath using voice resynthesis technology. Ratings of the intensity of discrete emotions (amusement, sadness, pleasure) and of general arousal in three perceptual experiments revealed that listeners (N = 283) judged vocalisations with attenuated ingressive syllables to be less emotionally intense compared to the originals. Ingressive vocalisations were not experienced as either unnatural or unpleasant, confirming that they are a familiar part of human vocal repertoire. In sum, ingressive phonation can occur in a wide range of human nonverbal vocalisations and typically conveys intense emotion, presumably because listeners associate heavy breathing, imperfect vocal control, and continuous egressive-ingressive vocalising with the physiological state of high arousal. It remains to be seen whether ingressive phonation is a mere byproduct of high arousal or whether it can be exaggerated, and whether its communicative function extends to vocalisations of non-human animals.
{"title":"Ingressive phonation conveys arousal in human nonverbal vocalizations","authors":"Andrey Anikin, D. Reby","doi":"10.1080/09524622.2022.2039295","DOIUrl":"https://doi.org/10.1080/09524622.2022.2039295","url":null,"abstract":"ABSTRACT Animals normally vocalise while exhaling. Ingressive, or inspiratory, voice production occurs in humans and many other species, but its communicative function, if any, remains unknown. To test the perceptual effects of ingressive phonation, naturally occurring ingressive syllables in 109 human nonverbal vocalisations (55 laughs, 21 cries, and 33 moans) were experimentally attenuated or morphed into quiet and unvoiced intakes of breath using voice resynthesis technology. Ratings of the intensity of discrete emotions (amusement, sadness, pleasure) and of general arousal in three perceptual experiments revealed that listeners (N = 283) judged vocalisations with attenuated ingressive syllables to be less emotionally intense compared to the originals. Ingressive vocalisations were not experienced as either unnatural or unpleasant, confirming that they are a familiar part of human vocal repertoire. In sum, ingressive phonation can occur in a wide range of human nonverbal vocalisations and typically conveys intense emotion, presumably because listeners associate heavy breathing, imperfect vocal control, and continuous egressive-ingressive vocalising with the physiological state of high arousal. It remains to be seen whether ingressive phonation is a mere byproduct of high arousal or whether it can be exaggerated, and whether its communicative function extends to vocalisations of non-human animals.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2022-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42260592","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 : 2022-01-19DOI: 10.1080/09524622.2022.2028422
Krista J. Patriquin
following a standard format that elaborate on distribution, emergence time, flight and foraging behaviour, habitat types the species is likely to be encountered, echolocation call characteristics, social call characteristics, and species likely to be confused due to overlapping call characteristics. A portrait of the species, a map of their distribution and a tabular summary of their main echolocation call characteristics complement the text. Spectrogram figures of echolocation calls in different environments are provided, as well as those of social calls. Where available, even descriptions of the sounds in heterodyne detectors are given. While describing these species-specific properties, it summarises most topics but goes in depth with echolocation and social calls, and its representation in heterodyne detectors and time expansion/full spectrum recording devices. The authors do not hesitate to clearly state where the former method is insufficient for accurate species identification. In contrast to other books on the market treating the subject, the reader does not find himself lost in a multitude of scatterplots, tables and flowcharts. The text is written in a scientifically sound language, citing relevant scientific articles throughout, but is still easily understandable to laypeople. With 20 pages of literature citations and 9 index pages this book is a very valuable reference, both for beginners interested to learn about echolocation and for experts.
{"title":"The Handbook of acoustic bat detection","authors":"Krista J. Patriquin","doi":"10.1080/09524622.2022.2028422","DOIUrl":"https://doi.org/10.1080/09524622.2022.2028422","url":null,"abstract":"following a standard format that elaborate on distribution, emergence time, flight and foraging behaviour, habitat types the species is likely to be encountered, echolocation call characteristics, social call characteristics, and species likely to be confused due to overlapping call characteristics. A portrait of the species, a map of their distribution and a tabular summary of their main echolocation call characteristics complement the text. Spectrogram figures of echolocation calls in different environments are provided, as well as those of social calls. Where available, even descriptions of the sounds in heterodyne detectors are given. While describing these species-specific properties, it summarises most topics but goes in depth with echolocation and social calls, and its representation in heterodyne detectors and time expansion/full spectrum recording devices. The authors do not hesitate to clearly state where the former method is insufficient for accurate species identification. In contrast to other books on the market treating the subject, the reader does not find himself lost in a multitude of scatterplots, tables and flowcharts. The text is written in a scientifically sound language, citing relevant scientific articles throughout, but is still easily understandable to laypeople. With 20 pages of literature citations and 9 index pages this book is a very valuable reference, both for beginners interested to learn about echolocation and for experts.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2022-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44753792","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 : 2022-01-10DOI: 10.1080/09524622.2021.2021987
Frowin K. Becker, F. Shabangu, T. Gridley, H. Wittmer, S. Marsland
ABSTRACT Bioacoustics has emerged as a useful method of data collection and analysis for diverse animals in a wide range of environments and has helped to describe, monitor, and conserve some of Africa’s species biodiversity. However, little is known about how much it contributes to the continent’s research corpus. We report results from a systematic review of bioacoustics applications in Africa that summarises the current state of the field and identifies research opportunities. Using keyword searches of bibliographic databases, scanning reference lists, and placing appeals to the bioacoustics community in Africa we identified 727 publications between 1953 and mid-2020. We documented variables ranging from publication type and author affiliation, geographic location, biome and habitat, biological groups, and research type. Most (69%) studies were focused on animal behaviour, with terrestrial species (88.6%), particularly mammals, substantially outweighing research on freshwater (4.8%) and marine (6.6%) habitats. The majority (74.3%) of authors who have contributed to this body of knowledge were non-African affiliates. Our review suggests that bioacoustics research in Africa has considerable room to expand institutionally, taxonomically, and thematically. We highlight the need and potential for more locally driven research and provide a roadmap for future bioacoustics applications across the continent.
{"title":"Sounding out a continent: seven decades of bioacoustics research in Africa","authors":"Frowin K. Becker, F. Shabangu, T. Gridley, H. Wittmer, S. Marsland","doi":"10.1080/09524622.2021.2021987","DOIUrl":"https://doi.org/10.1080/09524622.2021.2021987","url":null,"abstract":"ABSTRACT Bioacoustics has emerged as a useful method of data collection and analysis for diverse animals in a wide range of environments and has helped to describe, monitor, and conserve some of Africa’s species biodiversity. However, little is known about how much it contributes to the continent’s research corpus. We report results from a systematic review of bioacoustics applications in Africa that summarises the current state of the field and identifies research opportunities. Using keyword searches of bibliographic databases, scanning reference lists, and placing appeals to the bioacoustics community in Africa we identified 727 publications between 1953 and mid-2020. We documented variables ranging from publication type and author affiliation, geographic location, biome and habitat, biological groups, and research type. Most (69%) studies were focused on animal behaviour, with terrestrial species (88.6%), particularly mammals, substantially outweighing research on freshwater (4.8%) and marine (6.6%) habitats. The majority (74.3%) of authors who have contributed to this body of knowledge were non-African affiliates. Our review suggests that bioacoustics research in Africa has considerable room to expand institutionally, taxonomically, and thematically. We highlight the need and potential for more locally driven research and provide a roadmap for future bioacoustics applications across the continent.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2022-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46524323","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 : 2022-01-06DOI: 10.1080/09524622.2021.2008494
M. Mancini, F. Hintze, Rafael De Souza Laurindo, Rodrigo de Macêdo Mello, R. Gregorin
ABSTRACT Bats are a complex and diverse group, making their study remarkably challenging. Several methods allow the study of bats, e.g. mist-nets and acoustic monitoring (AM). We compare the use of AM and mist-nets to inventory bats in a mountainous region of São Paulo state, Brazil. We provide a species list for the study area based on species registered with both methodologies, comparing with a species list known for the state, obtained from the literature. We calculated beta diversity between methodologies to evaluate the dissimilarity in species composition sampled with these methods. We also performed a PCA to evaluate if the bat fauna sampled with AM showed species-habitat associations. We recorded 15 species/sonotypes through AM and 22 species through mist-nets. Beta diversity revealed 97% of dissimilarity in species composition. The turnover component explained 96% of this dissimilarity. PCA revealed that Vespertilionidae bats were associated with border/cluttered habitats, while Molossidae bats were present in all habitat types. The species list for the state comprises eighty species. Our inventory recorded more than 25% of this fauna. Mist-nets are efficient for sampling low-flying/low-intensity echolocating bats. AM is crucial for sampling high-flying/high-intensity echolocating bats. This is the second study to use AM to inventory bats in this state.
{"title":"Tradition vs. innovation: comparing bioacoustics and mist-net results to bat sampling","authors":"M. Mancini, F. Hintze, Rafael De Souza Laurindo, Rodrigo de Macêdo Mello, R. Gregorin","doi":"10.1080/09524622.2021.2008494","DOIUrl":"https://doi.org/10.1080/09524622.2021.2008494","url":null,"abstract":"ABSTRACT Bats are a complex and diverse group, making their study remarkably challenging. Several methods allow the study of bats, e.g. mist-nets and acoustic monitoring (AM). We compare the use of AM and mist-nets to inventory bats in a mountainous region of São Paulo state, Brazil. We provide a species list for the study area based on species registered with both methodologies, comparing with a species list known for the state, obtained from the literature. We calculated beta diversity between methodologies to evaluate the dissimilarity in species composition sampled with these methods. We also performed a PCA to evaluate if the bat fauna sampled with AM showed species-habitat associations. We recorded 15 species/sonotypes through AM and 22 species through mist-nets. Beta diversity revealed 97% of dissimilarity in species composition. The turnover component explained 96% of this dissimilarity. PCA revealed that Vespertilionidae bats were associated with border/cluttered habitats, while Molossidae bats were present in all habitat types. The species list for the state comprises eighty species. Our inventory recorded more than 25% of this fauna. Mist-nets are efficient for sampling low-flying/low-intensity echolocating bats. AM is crucial for sampling high-flying/high-intensity echolocating bats. This is the second study to use AM to inventory bats in this state.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2022-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45247707","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 : 2022-01-04DOI: 10.1080/09524622.2021.2023047
Yasmin Viana, T. Amorim, F. R. de Castro, L. Wedekin, A. D. Paro, Michel H. Montoril, M. Rossi-Santos, A. Andriolo
ABSTRACT Cetaceans depend highly on acoustic signals, such as whistles, for social communication. Mixed-species associations (MSAs), temporary or long-term encounters between different species, may play an important role on the acoustic dynamics of the species involved. Because of whistles’ communication function, we used these sounds to investigate the acoustic relationships of Tursiops truncatus when involved in different group contexts: in MSAs with two other delphinid species and in single species group. Acoustic recordings of T. truncatus single species groups and in associations with Globicephala melas and Grampus griseus were collected in the Western South Atlantic Ocean through a towed array of hydrophones. A total of 1267 whistles were analysed and acoustical parameters were extracted. To verify the differences among whistles produced in such contexts a support vector machine and random forest analysis were implemented. Both analyses revealed a clear separation of whistles from the single species versus the MSA as well as between both MSAs. The results indicate that interspecific associations may influence the whistle structure and suggests that T. truncatus whistles can be modified during interspecific interactions. These findings are useful to elucidate the possible factors underlying behavioural plasticity and interspecific associations and to understand dolphins’ acoustic communication.
{"title":"Are dolphins modulating whistles in interspecific group contexts?","authors":"Yasmin Viana, T. Amorim, F. R. de Castro, L. Wedekin, A. D. Paro, Michel H. Montoril, M. Rossi-Santos, A. Andriolo","doi":"10.1080/09524622.2021.2023047","DOIUrl":"https://doi.org/10.1080/09524622.2021.2023047","url":null,"abstract":"ABSTRACT Cetaceans depend highly on acoustic signals, such as whistles, for social communication. Mixed-species associations (MSAs), temporary or long-term encounters between different species, may play an important role on the acoustic dynamics of the species involved. Because of whistles’ communication function, we used these sounds to investigate the acoustic relationships of Tursiops truncatus when involved in different group contexts: in MSAs with two other delphinid species and in single species group. Acoustic recordings of T. truncatus single species groups and in associations with Globicephala melas and Grampus griseus were collected in the Western South Atlantic Ocean through a towed array of hydrophones. A total of 1267 whistles were analysed and acoustical parameters were extracted. To verify the differences among whistles produced in such contexts a support vector machine and random forest analysis were implemented. Both analyses revealed a clear separation of whistles from the single species versus the MSA as well as between both MSAs. The results indicate that interspecific associations may influence the whistle structure and suggests that T. truncatus whistles can be modified during interspecific interactions. These findings are useful to elucidate the possible factors underlying behavioural plasticity and interspecific associations and to understand dolphins’ acoustic communication.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2022-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41249982","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 : 2021-12-21DOI: 10.1080/09524622.2021.2010598
Jade Bateman, A. Uzal
ABSTRACT Technologies to monitor species are constantly evolving including the use of acoustic recordings to determine species presence, activity patterns and population dynamics. The Acoustic Complexity Index (ACI) aims to determine ecologically relevant changes in the soundscape by measuring the variability within biotic sounds whilst remaining insensitive to anthrophony. Previous findings relating to this index and its correlations with avian species richness and diversity, environmental and anthropogenic factors were amalgamated in this review to guide the future use of this monitoring technique. A total of 25 papers were returned following a literature search in June 2020 targeting studies in which these relationships were analysed. Current literature shows inconclusive relationships between the ACI and avian species richness and diversity. Also, those studies analysing relationships between the index, environmental and anthropogenic factors provided contrasting results due to the lack of replication between studies. The future implementation of a standardised approach towards data collection should lead to more compelling conclusions. Relationships between the soundscape and the environment should be evaluated on an individual site basis due to the influence species composition has on the acoustic environment. Further study is required to determine the relationship between anthropogenic factors, the ACI and avian assemblages.
{"title":"The relationship between the Acoustic Complexity Index and avian species richness and diversity: a review","authors":"Jade Bateman, A. Uzal","doi":"10.1080/09524622.2021.2010598","DOIUrl":"https://doi.org/10.1080/09524622.2021.2010598","url":null,"abstract":"ABSTRACT Technologies to monitor species are constantly evolving including the use of acoustic recordings to determine species presence, activity patterns and population dynamics. The Acoustic Complexity Index (ACI) aims to determine ecologically relevant changes in the soundscape by measuring the variability within biotic sounds whilst remaining insensitive to anthrophony. Previous findings relating to this index and its correlations with avian species richness and diversity, environmental and anthropogenic factors were amalgamated in this review to guide the future use of this monitoring technique. A total of 25 papers were returned following a literature search in June 2020 targeting studies in which these relationships were analysed. Current literature shows inconclusive relationships between the ACI and avian species richness and diversity. Also, those studies analysing relationships between the index, environmental and anthropogenic factors provided contrasting results due to the lack of replication between studies. The future implementation of a standardised approach towards data collection should lead to more compelling conclusions. Relationships between the soundscape and the environment should be evaluated on an individual site basis due to the influence species composition has on the acoustic environment. Further study is required to determine the relationship between anthropogenic factors, the ACI and avian assemblages.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47143334","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 : 2021-12-20DOI: 10.1080/09524622.2021.2013319
P. Mcdonald, Samantha J. Doohan, Kyia J. Eveleigh
ABSTRACT Land-use changes have greatly impacted biodiversity and led to new conservation challenges, including greater predation pressure, although this can be difficult to quantify. Here we directly monitor predator encounters in fragmented woodlands by using passive acoustic monitoring (PAM) and a semi-automated assessment protocol to detect functionally referential alarm vocalisations of the noisy miner Manorina melanocephala. We demonstrate that measuring changes in perceived predation pressure, the so-called ‘landscape of fear’, in a prey species across temporal (dawn, midday, dusk across multiple seasons) and spatial scales (small/large fragments and edge/centre locations within fragments) is achievable. Vocalisations linked with ground predator presence were rarer during midday recordings, but more commonly detected from the edge rather than centre of smaller fragments. While the probability of detecting aerial alarm calls directed at flying raptors also increased in edge habitat, aerial alarm detections declined from a dawn peak to a minimum during dusk recordings. These patterns did not simply reflect noisy miner occupancy or different sections of monitored patches, but highlighted higher perceived predation risk along edges, particularly for small patches, demonstrating the nuanced insights that PAM can offer when quantifying animal behaviour.
{"title":"Using referential alarm signals to remotely quantify ‘landscapes of fear’ in fragmented woodland","authors":"P. Mcdonald, Samantha J. Doohan, Kyia J. Eveleigh","doi":"10.1080/09524622.2021.2013319","DOIUrl":"https://doi.org/10.1080/09524622.2021.2013319","url":null,"abstract":"ABSTRACT Land-use changes have greatly impacted biodiversity and led to new conservation challenges, including greater predation pressure, although this can be difficult to quantify. Here we directly monitor predator encounters in fragmented woodlands by using passive acoustic monitoring (PAM) and a semi-automated assessment protocol to detect functionally referential alarm vocalisations of the noisy miner Manorina melanocephala. We demonstrate that measuring changes in perceived predation pressure, the so-called ‘landscape of fear’, in a prey species across temporal (dawn, midday, dusk across multiple seasons) and spatial scales (small/large fragments and edge/centre locations within fragments) is achievable. Vocalisations linked with ground predator presence were rarer during midday recordings, but more commonly detected from the edge rather than centre of smaller fragments. While the probability of detecting aerial alarm calls directed at flying raptors also increased in edge habitat, aerial alarm detections declined from a dawn peak to a minimum during dusk recordings. These patterns did not simply reflect noisy miner occupancy or different sections of monitored patches, but highlighted higher perceived predation risk along edges, particularly for small patches, demonstrating the nuanced insights that PAM can offer when quantifying animal behaviour.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41874305","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 : 2021-12-17DOI: 10.1080/09524622.2021.2006083
V. Palacios, S. Barber-Meyer, Barbara Marti-Domken, Lori J. Schmidt
ABSTRACT We studied the spontaneous vocal behaviour of captive wolves at the International Wolf Center (IWC) in Minnesota (spring 2019 and winter 2020), and the Centro del Lobo Ibérico Félix Rodríguez de la Fuente (CLIFRF) in Spain (winter 2020). We used AudioMoth recording devices to record wolf howling 24 h/day. We identified 412 solo howl series and 403 chorus howls and found differences between wolves at the two centres. Vocal rates for North American wolves at the IWC (7.8 chorus howls/day in spring and 4.8 chorus howls/day in winter) were higher than rates obtained for Iberian wolves from CLIFRF (3.8 chorus howls/day in winter). Howling rates obtained in our study were similar to those obtained for captive Mexican wolves and greater than those reported for wild wolves. Hourly distribution of howling was also different between centres. The greatest howling activity identified at IWC was at pre-sunrise, while at CLIFRF the peak occurred at sunset. Weather conditions had little influence on the vocal behaviour of the captive wolves we studied. We show the potential of passive recorders to study topics of animal acoustic communication, such as vocal rates and temporal patterns, that have not been deeply addressed due to technological constraints.
{"title":"Assessing spontaneous howling rates in captive wolves using automatic passive recorders","authors":"V. Palacios, S. Barber-Meyer, Barbara Marti-Domken, Lori J. Schmidt","doi":"10.1080/09524622.2021.2006083","DOIUrl":"https://doi.org/10.1080/09524622.2021.2006083","url":null,"abstract":"ABSTRACT We studied the spontaneous vocal behaviour of captive wolves at the International Wolf Center (IWC) in Minnesota (spring 2019 and winter 2020), and the Centro del Lobo Ibérico Félix Rodríguez de la Fuente (CLIFRF) in Spain (winter 2020). We used AudioMoth recording devices to record wolf howling 24 h/day. We identified 412 solo howl series and 403 chorus howls and found differences between wolves at the two centres. Vocal rates for North American wolves at the IWC (7.8 chorus howls/day in spring and 4.8 chorus howls/day in winter) were higher than rates obtained for Iberian wolves from CLIFRF (3.8 chorus howls/day in winter). Howling rates obtained in our study were similar to those obtained for captive Mexican wolves and greater than those reported for wild wolves. Hourly distribution of howling was also different between centres. The greatest howling activity identified at IWC was at pre-sunrise, while at CLIFRF the peak occurred at sunset. Weather conditions had little influence on the vocal behaviour of the captive wolves we studied. We show the potential of passive recorders to study topics of animal acoustic communication, such as vocal rates and temporal patterns, that have not been deeply addressed due to technological constraints.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46410231","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 : 2021-12-13DOI: 10.1080/09524622.2021.1998796
S. Kimura, Tomoka Sagara, K. Yoda, L. Ponnampalam
ABSTRACT The passive acoustic monitoring (PAM) technique has been widely used to detect odontocetes that emit echolocation clicks. However, identifying sympatric dolphins and porpoises using clicks, which is important especially for conservation purposes, remains challenging. In this study, a species identification technique at the family group level using PAM was applied to classify the click trains of two sympatric odontocetes, the Indo-Pacific finless porpoise (Neophocaena phocaenoides, N.p.) and Indo-Pacific humpback dolphin (Sousa chinensis, S.c.). A threshold was identified to discriminate between the two species using the two-band intensity ratios at 130 and 70 kHz. In addition to the significant difference in the two-band intensity ratio, analyses of the click train characteristics revealed that the click train duration and inter-click interval were significantly longer for S.c. than for N.p., indicating that these parameters enable more accurate species identification. Although this study provides a clear means of discriminating between the two species to reveal their distributions and habitat usage, additional studies are recommended to determine whether the same method can be employed to discriminate between other species known to have overlapping distributions in the region, such as Tursiops aduncus or Orcaella brevirostris.
{"title":"Acoustic identification of the sympatric species Indo-Pacific finless porpoise and Indo-Pacific humpback dolphin: an example from Langkawi, Malaysia","authors":"S. Kimura, Tomoka Sagara, K. Yoda, L. Ponnampalam","doi":"10.1080/09524622.2021.1998796","DOIUrl":"https://doi.org/10.1080/09524622.2021.1998796","url":null,"abstract":"ABSTRACT The passive acoustic monitoring (PAM) technique has been widely used to detect odontocetes that emit echolocation clicks. However, identifying sympatric dolphins and porpoises using clicks, which is important especially for conservation purposes, remains challenging. In this study, a species identification technique at the family group level using PAM was applied to classify the click trains of two sympatric odontocetes, the Indo-Pacific finless porpoise (Neophocaena phocaenoides, N.p.) and Indo-Pacific humpback dolphin (Sousa chinensis, S.c.). A threshold was identified to discriminate between the two species using the two-band intensity ratios at 130 and 70 kHz. In addition to the significant difference in the two-band intensity ratio, analyses of the click train characteristics revealed that the click train duration and inter-click interval were significantly longer for S.c. than for N.p., indicating that these parameters enable more accurate species identification. Although this study provides a clear means of discriminating between the two species to reveal their distributions and habitat usage, additional studies are recommended to determine whether the same method can be employed to discriminate between other species known to have overlapping distributions in the region, such as Tursiops aduncus or Orcaella brevirostris.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48756038","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 : 2021-12-07DOI: 10.1080/09524622.2021.2008495
Maheshi E. Dharmasiri, C. Barber, A. Horn
ABSTRACT Anthropogenic noise, so common in cities, continues to increase with urbanisation. It adversely affects avian species that rely on acoustic forms of communication. The negative impacts are further exacerbated when parent-offspring communication is considered, especially in species where young are entirely dependent on the care of their parents. Our first objective was to study the effects that loud traffic noise had on nestling begging calls in European Starlings, Sturnus vulgaris, an urban-thriving species. For our second objective, we examined how this noise impacted parental provisioning and nestling condition. We found that the minimum frequency of the begging calls was higher in nestlings within experimental broods (exposed to traffic-noise playback) compared to that of nestlings in the control broods (exposed only to ambient noise). Also, nestlings in experimental broods continued to beg at a higher minimum frequency but with a narrowed bandwidth after the playback was stopped. Parental provisioning rates did not differ between control and experimental broods, nor did fledging success, although nestlings in the experimental group were in poorer condition. Our findings suggest that urban thrivers are affected by increasing traffic noise but have the phenotypic flexibility to adapt at a young age to maintain critical parent-offspring communication.
{"title":"Nestling European Starlings (Sturnus vulgaris) adjust their begging calls in noise","authors":"Maheshi E. Dharmasiri, C. Barber, A. Horn","doi":"10.1080/09524622.2021.2008495","DOIUrl":"https://doi.org/10.1080/09524622.2021.2008495","url":null,"abstract":"ABSTRACT Anthropogenic noise, so common in cities, continues to increase with urbanisation. It adversely affects avian species that rely on acoustic forms of communication. The negative impacts are further exacerbated when parent-offspring communication is considered, especially in species where young are entirely dependent on the care of their parents. Our first objective was to study the effects that loud traffic noise had on nestling begging calls in European Starlings, Sturnus vulgaris, an urban-thriving species. For our second objective, we examined how this noise impacted parental provisioning and nestling condition. We found that the minimum frequency of the begging calls was higher in nestlings within experimental broods (exposed to traffic-noise playback) compared to that of nestlings in the control broods (exposed only to ambient noise). Also, nestlings in experimental broods continued to beg at a higher minimum frequency but with a narrowed bandwidth after the playback was stopped. Parental provisioning rates did not differ between control and experimental broods, nor did fledging success, although nestlings in the experimental group were in poorer condition. Our findings suggest that urban thrivers are affected by increasing traffic noise but have the phenotypic flexibility to adapt at a young age to maintain critical parent-offspring communication.","PeriodicalId":55385,"journal":{"name":"Bioacoustics-The International Journal of Animal Sound and Its Recording","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49547177","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：