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Geographic variation of advertisement calls in the terrestrial frog Eleutherodactylus nitidus (Anura: Eleutherodactylidae) in southern Mexico Bioacoustics (IF 1.8) Pub Date : 2024-02-21 Zeltzin Karina Vázquez-Hernández, José Manuel Serrano, Ricarda Ramírez-Julián, Carlos Alberto Hernández-Jiménez, Leticia M. Ochoa-Ochoa
Geographic variation in acoustic characteristics of anuran advertisement calls could be an important indicator of species divergence due to its importance for species recognition. In this study, we...
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The importance of acoustic background modelling in CNN-based detection of the neotropical White-lored Spinetail (Aves, Passeriformes, Furnaridae) Bioacoustics (IF 1.8) Pub Date : 2024-02-13 Thiago M. Ventura, Todor D. Ganchev, Cristian Pérez-Granados, Allan G. de Oliveira, Gabriel de S. G. Pedroso, Marinez I. Marques, Karl-L. Schuchmann
Machine learning tools are widely used in support of bioacoustics studies, and there are numerous publications on the applicability of convolutional neural networks (CNNs) to the automated presence...
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Sleep fragmentation disrupts vocal interactions in rats Bioacoustics (IF 1.8) Pub Date : 2024-01-15 Léo Perrier, Amandine Cascarino, Chloé Mounichetty, Florence Levréro, Nicolas Mathevon, Frédéric Roche
Repeated interruption of the sleep cycle, commonly known as sleep fragmentation, is associated with a plethora of health issues, ranging from mood swings and memory loss to severe neurodegenerative...
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The sound of hope: searching for critically endangered species using acoustic template matching Bioacoustics (IF 1.8) Pub Date : 2023-12-29 C.B. De Araújo, J.P. Zurano, I.M.D. Torres, C.R.M.A. Simões, G.L.M. Rosa, A.G. Aguiar, W. Nogueira, H.A.L.S. Vilela, G. Magnago, B.T. Phalan, G.A. Zurita
Passive acoustic monitoring (PAM) has become increasingly popular in monitoring biodiversity. It produces large amounts of data and can provide a foundation for understanding the long-term conseque...
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Sound production in sea turtle nests and hatchlings (Eretmochelys imbricata and Caretta caretta) in Northeast Brazil Bioacoustics (IF 1.8) Pub Date : 2023-12-29 Safira Núbia Dias de Melo, Matheus Felipe de Souza Dias da Silva, Paulo Jorge Parreira dos Santos, Vívian Chimendes da Silva Neves, Bruna Martins Bezerra
Sea turtles have been considered the least vocal of living reptiles, but recent studies are changing this perception. Here, we aimed to investigate the acoustics of hatchlings of, Eretmochelys imbr...
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Tradeoffs in sound quality and cost for passive acoustic devices Bioacoustics (IF 1.8) Pub Date : 2023-12-12 Clarissa A. Starbuck, Logan M. DeSchepper, Meredith L. Hoggatt, Joy M. O’Keefe
Ecologists often collect data with automatic sensors such as passive acoustic devices. Traditional commercial passive acoustic devices that record ultrasonic sounds are usually > 700USD; less costl...
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Audio data compression affects acoustic indices and reduces detections of birds by human listening and automated recognisers Bioacoustics (IF 1.8) Pub Date : 2023-12-12 Alexander G. MacPhail, Daniel A. Yip, Elly C. Knight, Richard Hedley, Michelle Knaggs, Julia Shonfield, Emily Upham-Mills, Erin M. Bayne
Increasing popularity in passive acoustic monitoring and the ease with which researchers can accumulate large quantities of acoustic data has resulted in challenges for audio recording storage, arc...
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Summer calling activity patterns of a bird assemblage in a Valdivian temperate rainforest biodiversity hotspot Bioacoustics (IF 1.8) Pub Date : 2023-11-16 Felipe N. Moreno-Gómez, José Bartheld, Raúl Briones, Rafael Márquez, Mario Penna
Birds generally produce vocalisations in specific daily temporal windows. Describing diel-calling activity patterns along with taxonomic group and guild membership increase the knowledge about pote...
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Unsupervised discrimination of male Tawny owls (Strix aluco) individual calls using robust measurements of the acoustic signal Bioacoustics (IF 1.8) Pub Date : 2023-11-01 Daniele Roccazzello, Orlando Tomassini, Elena Bernardini, Alessandro Massolo, Marco Dragonetti, Dimitri Giunchi
Vocal individuality has been widely documented in the Tawny owl (Strix aluco); however, all statistical tools employed thus far to discriminate individual vocalisations have relied on prior knowled...
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Parselmouth for bioacoustics: automated acoustic analysis in Python Bioacoustics (IF 1.8) Pub Date : 2023-10-13 Yannick Jadoul, Bart de Boer, Andrea Ravignani
Bioacoustics increasingly relies on large datasets and computational methods. The need to batch-process large amounts of data and the increased focus on algorithmic processing require software tool...
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Threat vocalisations are acoustically similar between humans (Homo sapiens) and chimpanzees (Pan troglodytes) Bioacoustics (IF 1.8) Pub Date : 2023-08-29 Roza G. Kamiloğlu, Cantay Çalışkan, Katie E. Slocombe, Disa A. Sauter
In behavioural contexts like fighting, eating, and playing, acoustically distinctive vocalisations are produced across many mammalian species. Such expressions may be conserved in evolution, pointi...
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Evaluating factors affecting species detection using passive acoustic monitoring in neotropical forests: a playback experiment Bioacoustics (IF 1.8) Pub Date : 2023-08-25 Anja Hutschenreiter, J. Roberto Sosa-López, Fernando González-García, Filippo Aureli
Passive acoustic monitoring (PAM) has become a popular approach for terrestrial species monitoring. Studies determining detection ranges and predictors of detection probability are needed for accur...
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The functions and evolution of graded complex calls in a treefrog Bioacoustics (IF 1.8) Pub Date : 2023-08-03 Bicheng Zhu, Xiaomeng Zhao, Haodi Zhang, Jichao Wang, Jianguo Cui
Variation in signal complexity is common among different species. Understanding why some species have evolved extensive call complexity can offer insight into the evolution of complex signals. In t...
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Chasing the bird: 3D acoustic tracking of aerial flight displays with a minimal planar microphone array Bioacoustics (IF 1.8) Pub Date : 2023-08-02 Guillaume Dutilleux, Brett K. Sandercock, John Atle Kålås
Tracking the flight patterns of birds and bats in three-dimensional space is central to key questions in evolutionary ecology but remains a difficult technical challenge. For example, complex aeria...
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What do we know about advertisement calls of Mexican anurans? A bibliographic review Bioacoustics (IF 1.8) Pub Date : 2023-08-02 Samantha Ordóñez-Flores, Atziri Alicia Ibarra-Reyes, Leticia M. Ochoa-Ochoa
In a fast-changing environment, it is important to keep track of biodiversity. In Mexico, new herpetofauna is described every year. Vocalisations can portray ecological and evolutionary characteris...
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Evidence of signature whistles produced by Indian Ocean bottlenose dolphins (Tursiops aduncus) in Mozambique Bioacoustics (IF 1.8) Pub Date : 2023-07-05 Rachel Probert, Angie Gullan, Diana Rocha, Sasha Dines, Tess Gridley
ABSTRACT Individually distinctive signature whistles are used by common bottlenose dolphins (Tursiops truncatus) during social interactions and to facilitate group cohesion. There is evidence from a few populations that Indian Ocean bottlenose dolphins (T. aduncus) also use signature whistles. We investigated this from a coastal resident population of T. aduncus in Mozambique. Video-audio data were
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Women misjudge men’s physical characteristics based on vocal cues Bioacoustics (IF 1.8) Pub Date : 2023-06-29 Łukasz Piotr Pawelec, Katarzyna Graja, Jagoda Marchewczyk, Anna 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)
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Wind farm noise and anuran diversity patterns: a case study in Brazilian seasonal dry tropical forest Bioacoustics (IF 1.8) Pub Date : 2023-06-05 Rogério Ferreira de Oliveira, André Felipe de Araujo Lira, Valentina Zaffaroni-Caorsi, Geraldo Jorge Barbosa 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
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Passive acoustic surveys and the BirdNET algorithm reveal detailed spatiotemporal variation in the vocal activity of two anurans Bioacoustics (IF 1.8) Pub Date : 2023-05-15 Connor M. Wood, Stefan Kahl, Stephanie Barnes, Rachel Van Horne, Cathy Brown
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 ...
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Passive acoustic monitoring in terrestrial vertebrates: a review Bioacoustics (IF 1.8) Pub Date : 2023-05-10 Sebastian Hoefer, Donald T. McKnight, Slade Allen-Ankins, Eric J. Nordberg, Lin 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
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How do tree density and body size influence acoustic signals in Amazonian nurse frogs? Bioacoustics (IF 1.8) Pub Date : 2023-04-27 Marina Vieira da Rosa, Miquéias Ferrão, Pedro Aurélio Costa Lima Pequeno, Albertina Pimentel 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
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Automated cataloguing of American silver perch (Bairdiella chrysoura) calls using machine learning Bioacoustics (IF 1.8) Pub Date : 2023-04-20 DelWayne R. 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
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Past, present, and future of a tropical sounds collection from Colombia Bioacoustics (IF 1.8) Pub Date : 2023-04-19 Angela M. Mendoza-Henao, Orlando Acevedo-Charry, Daniela Martínez-Medina, Eliana Barona-Cortés, Sergio Córdoba-Córdoba, Paula Caycedo-Rosales, Juan Sebastián Ulloa, Kevin G. 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
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Breeding phenology and behaviour of the Endangered Hewitt’s ghost frog Heleophryne hewitti in the Baviaanskloof World Heritage Site, Eastern Cape Province, South Africa Bioacoustics (IF 1.8) Pub Date : 2023-03-30 Brian Reeves, Werner 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
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Acoustic plasticity in Boana goiana (Lutz, 1968) (Anura, Hylidae): how males respond to successive interactions with conspecific competitors Bioacoustics (IF 1.8) Pub Date : 2023-03-21 Tainã Lucas Andreani, Rogério Pereira Bastos, Mariana Nascimento Siqueira, Werther Pereira 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
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A study on the bioacoustics of Oriental scaly crickets (Orthoptera: Mogoplistinae), with a focus on Singaporean species Bioacoustics (IF 1.8) Pub Date : 2023-02-27 Ming Kai Tan, Zhu-Qing He, Sigfrid 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
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Hard of hearing: the effect of distance and experimental noise on mountain chickadee song transmission Bioacoustics (IF 1.8) Pub Date : 2023-02-09 C. L. Snell, M. W. Reudink, K. A. Otter
ABSTRACT Urban noise can disrupt avian communication networks, resulting in reduced communication among individuals. Mountain chickadees alter their vocalisations in areas of high ambient noise; however, it is unknown how audible their signals are within the nest cavity, where the female remains during dawn signalling. To test the relative audibility of songs within the nest box of urban and rural
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Temporal partitioning of Bullacris unicolor (Orthoptera: Pneumoridae) calling activity to avoid predation Bioacoustics (IF 1.8) Pub Date : 2023-01-30 Robyn Manuel, Tarné Johannes, Rekha Sathyan, Vanessa Cathrine Kemsley Couldridge
ABSTRACT Ecological interactions, including competition, predation, and environmental conditions, may significantly impact acoustic signalling behaviour. Here we characterise nocturnal signalling patterns in the bladder grasshopper Bullacris unicolor and relate this to biotic and abiotic factors, thus providing insights into ecological drivers of acoustic signalling behaviour. Passive acoustic recorders
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Caterpillar sonic defences: mechanisms and diversity of mandible stridulation in silk and hawk moth (Bombycoidea) larvae Bioacoustics (IF 1.8) Pub Date : 2022-11-09 Melanie L. Low, Veronica L. Bura, Jayne E. Yack
ABSTRACT Silk and hawk moth caterpillars produce a variety of defence sounds described as clicking, chirping, whistling, and vocalising. Such diversity provides opportunity to test hypotheses on the functions and evolution of insect defence sounds using comparative analyses. A key step to conducting comparative analyses is to categorise different phenotypes. Here, we describe mandible sounds of 20
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Singing in a noisy ocean: vocal plasticity in male humpback whales Bioacoustics (IF 1.8) Pub Date : 2022-09-28 E. Girola, R. A. Dunlop, M. J. Noad
ABSTRACT The songs produced by male humpback whales are believed to be a reproductive display shared by all singers within the same population. Ocean noise can interfere with the transmission of acoustic signals such as humpback whale songs. However, humpback whales evolved in an environment characterised by variable levels of noise generated by natural sources. This study investigates whether singing
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Seasonal song ontogeny in western North Atlantic humpback whales: drawing parallels with songbirds Bioacoustics (IF 1.8) Pub Date : 2022-09-19 Katie Kowarski, Salvatore Cerchio, Hal Whitehead, Danielle Cholewiak, Hilary Moors-Murphy
ABSTRACT The use of song as a reproductive display is common in the animal kingdom; however, for many taxa, little is known of song ontogeny. Male humpback whales produce elaborate songs on low latitude breeding grounds in winter and begin to sing on high latitude feeding grounds in late summer, yet songs from the two locations are rarely compared. Seasonal song ontogeny in western North Atlantic humpback
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Non-linear phenomena: a common acoustic feature of bottlenose dolphin (Tursiops truncatus) signature whistles Bioacoustics (IF 1.8) Pub Date : 2022-09-16 Jessica J. Sportelli, Brittany L. Jones, Sam H. Ridgway
ABSTRACT Biphonation, deterministic chaos, sidebands and subharmonics are four non-linear phenomena (NLP) that have been identified as common additions in the phonations of animals. NLP have been hypothesised to communicate urgency, caller identification, fitness and arousal/valence states for a variety of species but have yet to be studied in detail for bottlenose dolphins. For this study, the signature
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Hurry up and sing: early onset of diel calling behaviour and ecological drivers of calling behaviour of Acanthoplus discoidalis Bioacoustics (IF 1.8) Pub Date : 2022-08-25 Aileen C. van der Mescht, Chanel Lewis, Runè van der Merwe, Daryl Codron
ABSTRACT Animals adopt circadian rhythms and diel calling patterns to ensure successful breeding, avoid predators, and reduce intra- and inter-species competition. We determine the diel calling behaviour of the bush cricket, Acanthoplus discoidalis, across different vegetation types in the southern Kalahari, and whether any variation in calling behaviour exists across the different regions of the landscape
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Analysis of Mouse Vocal Communication (AMVOC): a deep, unsupervised method for rapid detection, analysis and classification of ultrasonic vocalisations Bioacoustics (IF 1.8) Pub Date : 2022-08-25 Vasiliki Stoumpou, César D. M. Vargas, Peter F. Schade, J. Lomax Boyd, Theodoros Giannakopoulos, Erich D. Jarvis
ABSTRACT Some aspects of the neural mechanisms underlying mouse ultrasonic vocalisations (USVs) are a useful model for the neurobiology of human speech and speech-related disorders. Much of the research on vocalisations and USVs is limited to offline methods and supervised classification of USVs, hindering the discovery of new types of vocalisations and the study of real-time free behaviour. To address
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In-air acoustic repertoire and associated behaviour of wild juvenile crabeater seals during rehabilitation Bioacoustics (IF 1.8) Pub Date : 2022-08-18 Fannie W. Shabangu, G. J. Greg Hofmeyr, Rachel Probert, Maëlle Connan, Corrine A. Buhrmann, Tess Gridley
ABSTRACT In-air sounds of pinnipeds are important for interactions with conspecifics and threat displays. However, little is known about the in-air acoustic repertoire and associated behaviour of crabeater seals Lobodon carcinophaga. We investigated the in-air acoustic repertoire and associated behaviour of two male and one female wild juvenile crabeater seals that beached separately, and were rehabilitated
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Sex differences in frequencies in a species with modest sexual size dimorphism Bioacoustics (IF 1.8) Pub Date : 2022-08-10 Gal Frydman, Yael Goll, Eli Geffen, Lee Koren
ABSTRACT Sex differences in vocalizations are found across the animal kingdom, which may be due to different vocal apparatus, call function, and context. Rock hyraxes (Procavia capensis) of both sexes are vocal, but the sexes differ in repertoire size, call usage, and amplitude. In this study we examined sex differences in vocalization frequencies and predicted that they will be low and that frequency
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Effects of noise on acoustic and visual signalling in the Croaking Gourami: differences in adaptation strategies in fish Bioacoustics (IF 1.8) Pub Date : 2022-06-14 Isabelle Pia Maiditsch, Friedrich Ladich
ABSTRACT Numerous fishes produce sounds and their transmission and detection may be hindered by increasing levels of anthropogenic noise. We investigated acoustic communication during dyadic contests between male croaking gouramis (Trichopsis vittata, Osphronemidae) in the presence and absence of white noise. We hypothesised that fish modify acoustic signalling in the presence of noise in order to
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Tic, Tii and Trii calls: advertisement call descriptions for eight glass frogs from Colombia and analysis of the structure of auditory signals in Centrolenidae Bioacoustics (IF 1.8) Pub Date : 2022-06-13 Sebastián Duarte-Marín, Marco Rada, Mauricio Rivera-Correa, Valentina Caorsi, Eliana Barona, Gustavo González-Durán, Fernando Vargas-Salinas
ABSTRACT In anurans, vocalisations are the main behavioural modality of communication. Hence, the description of acoustic signals in anurans is important for understanding many aspects of their biology. We describe for the first time the advertisement calls for eight glass frog species (Centrolene antioquiensis, ”Centrolene” robledoi, Nymphargus caucanus, N. chami, N. ignotus, N. rosada, N. spilotus
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Effects of anthropogenic noise on anuran amphibians Bioacoustics (IF 1.8) Pub Date : 2022-05-22 Valentina Zaffaroni-Caorsi, Camila Both, Rafael Márquez, Diego Llusia, Peter Narins, Marina Debon, Márcio Borges-Martins
ABSTRACT Anthropogenic noise is widespread in nature and has been shown to produce a plethora of impacts on wildlife. Sounds play a fundamental role in the lives of amphibians, with species relying on acoustic communication for social and reproductive behaviour, and thus noise can potentially interfere with these activities. Here, we provide a literature review on the effects of anthropogenic noise
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Local competitive environment and male condition influence within-bout calling patterns in túngara frogs Bioacoustics (IF 1.8) Pub Date : 2022-05-10 Luke C. Larter, Ximena E. Bernal, Rachel A. Page, Michael J. Ryan
ABSTRACT Flexible signalling behaviour is widespread, with adjustments often enhancing gains or reducing costs of signalling based on the current state of the signaller’s local communication network. Male túngara frogs call within multispecies communication networks containing conspecifics (both target receivers and rivals) and eavesdropping predators. These diverse players all exert an influence on
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Two of the most common crustacean zooplankton Meganyctiphanes norvegica and Calanus spp. produce sounds within the hearing range of their fish predators Bioacoustics (IF 1.8) Pub Date : 2022-05-05 Saskia Kühn, Anne Christine Utne-Palm, Karen de Jong
ABSTRACT Sound is an effective channel for the transfer of information underwater. While it is known that fish and whales can use sound for communication, and as a cue to localise predators and prey, much less is known about sound production in invertebrates. Here we describe sounds produced by two of the most common marine crustacean zooplankton in the Northern hemisphere: Northern krill (Meganyctiphanes
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The katydid country: bioacoustics and ecology of tettigoniid communities from the Indian subcontinent Bioacoustics (IF 1.8) Pub Date : 2022-04-22 Chandranshu Tiwari, Swati Diwakar
ABSTRACT The study provides the first description of acoustic communities from a subtropical rainforest in Northeast India and a previously unexplored site from the Western Ghats. We describe call structures of 15 katydid species from the Indian subcontinent. The habitat and seasonal variations of the communities were investigated at both sites. Most species observed produced ultrasonic broadband calls
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Spatial variation of vocalising dugongs around Talibong Island, Thailand Bioacoustics (IF 1.8) Pub Date : 2022-04-11 Kotaro Tanaka, Kotaro Ichikawa, Kongkiat Kittiwattanawong, Nobuaki Arai, Hiromichi Mitamura
ABSTRACT While the occurrence of Dugong (Dugong dugon) has been examined by visual surveys, their habitat use is still not fully understood, since the continuous observation of their behaviour is challenging. Passive acoustic monitoring enables the observation of dugongs’ vocal behaviour, which is one of the key components of their social behaviour, but the temporal and spatial scale of previous studies
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Listening in the dark: acoustics indices reveal bat species diversity in a tropical savannah Bioacoustics (IF 1.8) Pub Date : 2022-04-01 Claysson de Aguiar Silva, Ricardo B. Machado, Mauricio Silveira, Ludmilla M. S. Aguiar
ABSTRACT Surveying biodiversity using bioacoustics has become increasingly common worldwide, although it is mostly concentrated in temperate regions. The variety of automatic recorders, the development of free analytical tools, and several acoustic indices have increased the number of studies worldwide. The bioacoustic approach is essential for application in poorly surveyed regions with the pressure
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Hidden Markov models for detection of Mysticetes vocalisations based on principal component analysis Bioacoustics (IF 1.8) Pub Date : 2022-03-25 Olayinka O. Ogundile, Oluwaseyi P. Babalola, Seun G. Odeyemi, Kazeem I. Rufai
ABSTRACT The economic relevance of Mysticetes has prompted marine ecologists and biologists to investigate this suborder of cetaceans. Mysticetes produce distinct vocal repertoires, which are recorded to analyse the behaviour of the species within its ecology. Passive acoustic monitoring (PAM) is a standard technique for tracking Mysticete movement and vocalisation. PAM collects enormous datasets over
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Automated bat call classification using deep convolutional neural networks Bioacoustics (IF 1.8) Pub Date : 2022-03-18 E. Schwab, S. Pogrebnoj, M. Freund, F. Flossmann, S. Vogl, K.-H. Frommolt
ABSTRACT Identification of bats is most practically done by exploiting the characteristic features of their echolocation calls. This usually involves expert knowledge, expensive equipment and time-consuming post processing of previously recorded calls. Automated solutions exist, but are usually not as accurate as human experts. We present an automated solution for the processing of bat calls and identification
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Environmental factors influencing call propagation in Pithecopus nordestinus: testing the acoustic adaptation hypothesis Bioacoustics (IF 1.8) Pub Date : 2022-03-03 Lidiane Gomes, David Lucas Röhr, Renata S. Sousa-Lima, Adrian Antonio Garda, Flora Acuña Juncá
ABSTRACT The acoustic adaptation hypothesis (AAH) states that the acoustic signal of a species must propagate better in its native habitat. Studies have shown that certain anuran species modify acoustic parameters according to the environment where they are calling. However, these studies did not verify if these modifications improved the call’s transmission. We investigated whether advertisement calls
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Ingressive phonation conveys arousal in human nonverbal vocalizations Bioacoustics (IF 1.8) Pub Date : 2022-02-23 Andrey Anikin, David 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
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The Handbook of acoustic bat detection Bioacoustics (IF 1.8) Pub Date : 2022-01-19 Krista Patriquin
Published in Bioacoustics: The International Journal of Animal Sound and its Recording (Vol. 31, No. 6, 2022)
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I beg your pardon? Acoustic behaviour of a wild solitary common dolphin who interacts with harbour porpoises Bioacoustics (IF 1.8) Pub Date : 2022-01-10 Mel Cosentino, David Nairn, Mariano Coscarella, Joseph C. Jackson, James F. C. Windmill
ABSTRACT Kylie is a solitary common dolphin who inhabits a restricted area within the Firth of Clyde (Scotland). She spends most of her time around navigational buoys in the Hunterston/Fairlie channel, where she has been seen interacting with harbour porpoises. Recordings from 2016 and 2017 were used to study her acoustic behaviour when seen alone and with a porpoise. Clicks were classified as potential
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Sounding out a continent: seven decades of bioacoustics research in Africa Bioacoustics (IF 1.8) Pub Date : 2022-01-10 Frowin K. Becker, Fannie W. Shabangu, Tess Gridley, Heiko U. Wittmer, Stephen 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
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Tradition vs. innovation: comparing bioacoustics and mist-net results to bat sampling Bioacoustics (IF 1.8) Pub Date : 2022-01-06 Matheus Camargo Silva Mancini, Frederico Hintze, Rafael de Souza Laurindo, Rodrigo de Macêdo Mello, Renato 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
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“Bat calls of Britain and Europe” Bioacoustics (IF 1.8) Pub Date : 2022-01-04 Martin K. Obrist
Published in Bioacoustics: The International Journal of Animal Sound and its Recording (Vol. 31, No. 6, 2022)
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Are dolphins modulating whistles in interspecific group contexts? Bioacoustics (IF 1.8) Pub Date : 2022-01-04 Yasmin Viana, Thiago Orion Simões Amorim, Franciele Rezende de Castro, Leonardo Wedekin, Alexandre Douglas Paro, Michel Helcias Montoril, Marcos Rossi-Santos, Artur 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
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The relationship between the Acoustic Complexity Index and avian species richness and diversity: a review Bioacoustics (IF 1.8) Pub Date : 2021-12-21 Jade Bateman, Antonio 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
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Using referential alarm signals to remotely quantify ‘landscapes of fear’ in fragmented woodland Bioacoustics (IF 1.8) Pub Date : 2021-12-20 Paul G. 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
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Assessing spontaneous howling rates in captive wolves using automatic passive recorders Bioacoustics (IF 1.8) Pub Date : 2021-12-17 Vicente Palacios, Shannon M. Barber-Meyer, Bárbara Martí-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
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Acoustic identification of the sympatric species Indo-Pacific finless porpoise and Indo-Pacific humpback dolphin: an example from Langkawi, Malaysia Bioacoustics (IF 1.8) Pub Date : 2021-12-13 Satoko S. Kimura, Tomoka Sagara, Ken Yoda, Louisa S. 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
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Nestling European Starlings (Sturnus vulgaris) adjust their begging calls in noise Bioacoustics (IF 1.8) Pub Date : 2021-12-07 Maheshi E. Dharmasiri, Colleen A. Barber, Andrew G. 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
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Adaptation of dolphins’ (Tursiops truncatus) location signals when searching for and identifying objects hidden by sea sediments Bioacoustics (IF 1.8) Pub Date : 2021-11-15 K. A. Zaitseva, V. I. Korolev, A. V. Akhi, A. A. Akhi
ABSTRACT An experimental study was conducted to research dolphins’ sonar adaptation capabilities for location of objects obscured by marine sediments. It was shown that dolphins are able to alter spectral and temporal characteristics of their location signals. Adaptive change in length, spectral width and amplitude of signals provides optimal tools to fight interference and allows dolphins to effectively