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Artykuły w czasopismach na temat "Bird vocalizations"
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Batistela, Marciela, i Eliara Solange Müller. "Analysis of duet vocalizations in Myiothlypis leucoblephara (Aves, Parulidae)". Neotropical Biology and Conservation 14, nr 2 (13.08.2019): 297–311. http://dx.doi.org/10.3897/neotropical.14.e37655.
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Bird vocalizations might be used for specific recognition, territorial defense, and reproduction. Bioacoustic studies aim to understand the production, propagation and reception of acoustic signals, and they are an important component of research on animal behavior and evolution. In this study we analyzed the sound structure of duet vocalizations in pairs of Myiothlypis leucoblephara and evaluated whether the vocal variables differ among pairs and if there are differences in temporal characteristics and frequency of duets between pairs in forest edges vs. forest interior. Vocalizations were recorded from 17 bird pairs in three remnants of Atlantic Forest in southern Brazil. Six of the bird pairs were situated at the edge of the forest remnant, and 11 were in the interior of the remnant. The duets of different pairs between forest areas showed descriptive differences in the frequency, number of notes per call, and time between issuance of calls, with the main distinguishing feature being a change in frequency of a few notes in the second part of the musical phrase. The minimum frequency of vocalization was reduced at the private area than in the other two remnants (p <0.05). The duets of birds in the forest edge and forest interior did not significantly differ in minimum or maximum frequency of phrases (p> 0.05), phrase duration (p> 0.05) or number of notes per phrase (p> 0.05). Myiothlypis leucoblephara did not show a specific pattern with respect to issue of phrases in duets, but instead showed five different patterns, which were variable among pairs. There was a sharp decline or alternation in frequency between notes in the second part of the musical phrase for recognition among pairs. Variation in vocalization among M. leucoblephara duets may play a role in pair recognition.
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Divyapriya, Chandrasekaran, i Padmanabhan Pramod. "Ornithophony in the soundscape of Anaikatty Hills, Coimbatore, Tamil Nadu, India". Journal of Threatened Taxa 11, nr 12 (26.09.2019): 14471–83. http://dx.doi.org/10.11609/jott.4948.11.12.14471-14483.
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An attempt has been made to understand the extent of ornithophony (vocalization of birds) in the soundscape of Anaikatty Hills. The study was limited to 13 hours of daylight from dawn to dusk (06.00–19.00 h) between January 2015 and October 2016. Six replicates of 5-minute bird call recordings were collected from each hour window in 24 recording spots of the study area. Each 5-minute recording was divided into 150 ‘2-sec’ observation units for the detailed analysis of the soundscape. A total of 78 recordings amounting to 390 minutes of acoustic data allowed a preliminary analysis of the ornithophony of the area. A total of 62 bird species were heard vocalizing during the study period and contributed 8,629 units. A total of 73.75% acoustic space was occupied by birds, among which the eight dominant species alone contributed to 63.65% of ornithophony. The remaining 26% of acoustic space was occupied by other biophonies (12.60%), geophony (5.57%), indistinct sounds (7.66%), and anthropogenic noise (0.41%). Passerines dominated the vocalizations with 7,269 (84.24%) and non-passerines with 1,360 (15.76%) units. Birds vocalized in all 13 observation windows, with a peak in the first three hours of the day (06.00–09.00 h). Vocalizations of non-passerines were prominent in the dusk hours (18.00–19.00 h).
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Raposo, Marcos A., i Elizabeth Höfling. "Overestimation of vocal characters in Suboscine taxonomy (Aves: Passeriformes: Tyranni): causes and implications". Lundiana: International Journal of Biodiversity 4, nr 1 (2.12.2022): 35–42. http://dx.doi.org/10.35699/2675-5327.2003.21833.
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The difference in treatment of vocal features in Oscines and Suboscines passerine birds characterizes a large portion of the current studies on their taxonomy. In the former taxon, vocalization is supposed to be molded by learning, and consequently is not regarded as taxonomically informative. In the latter, a strong emphasis is given to vocalization because it supposedly reflects the genetic structure of populations. This paper reviews the various assumptions related to this difference in treatment, including the overestimation of the vocal characters in suboscine alpha taxonomy due to the alleged importance of vocalization under the framework of the species mate recognition system. The innate origin of suboscine vocalizations remains to be rigorously demonstrated and the use of vocalization as “super-characters” is prejudicial to bird taxonomy. Despite the possibility of being learned, vocalization should also be used in the taxonomic studies of oscine passerines.
Keywords: Vocalization, Oscines, Suboscines, Birds, Passeriformes
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Abdel-Kafy, El-Sayed M., Samya E. Ibraheim, Alberto Finzi, Sabbah F. Youssef, Fatma M. Behiry i Giorgio Provolo. "Sound Analysis to Predict the Growth of Turkeys". Animals 10, nr 5 (17.05.2020): 866. http://dx.doi.org/10.3390/ani10050866.
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Protocols for manual weighing of turkeys are not practical on turkey farms because of the large body sizes, heavy weights and flighty nature of turkeys. The sounds turkeys make may be a proxy for bird weights, but the relationship between turkey sounds and bird weights has not been studied. The aim of this study was to correlate peak frequency (PF) of vocalization with the age and weight of the bird and examine the possibility using PF to predict the weight of turkeys. The study consisted of four trials in Egypt. Sounds of birds and their weights were recorded for 11 days during the growth period in each trial. A total 2200 sounds were manually analyzed and labelled by extracting individual and general sounds on the basis of the amplitude and frequency of the sound signal. The PF of vocalizations in each trial, as well as in pooled trails, were evaluated to determine the relationship between PF and the age and weight of the turkey. PF exhibited a highly significant negative correlation with the weight and age of the turkeys showing that PF of vocalizations can be used for predicting the weight of turkeys. Further studies are necessary to refine the procedure.
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Monteiro, Ronan de Azevedo, Carolina Demetrio Ferreira i Gilmar Perbiche-Neves. "Vocal repertoire and group-specific signature in the Smooth-billed Ani, Crotophaga ani Linnaeus, 1758 (Cuculiformes, Aves)". Papéis Avulsos de Zoologia 61 (30.07.2021): e20216159. http://dx.doi.org/10.11606/1807-0205/2021.61.59.
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Vocal plasticity reflects the ability of animals to vary vocalizations according to context (vocal repertoire) as well as to develop vocal convergence (vocal group signature) in the interaction of members in social groups. This feature has been largely reported for oscine, psittacine and trochilid birds, but little has been investigated in birds that present innate vocalization. The smooth-billed ani (Crotophaga ani) is a social bird that lives in groups between two and twenty individuals, and which presents innate vocalization. Here we analyzed the vocal repertoire of this species during group activities, and further investigated the existence of a vocal group signature. The study was conducted in the Southeast of Brazil between May 2017 and April 2018. Two groups of smooth-billed anis were followed, Guararema and Charqueada groups, and their vocalizations were recorded and contextualized as to the performed behavior. The vocal repertoire was analyzed for its composition, context and acoustic variables. The acoustic parameters maximum peak frequency, maximum fundamental frequency, minimum frequency, maximum frequency and duration were analyzed. To verify the vocal signature of the group, we tested whether there was variation in the acoustic parameters between the monitored groups. We recorded ten vocalizations that constituted the vocal repertoire of the Smooth-billed Ani, five of which (“Ahnee”, “Whine”, “Pre-flight”, “Flight” and “Vigil”) were issued by the two groups and five exclusive to the Charqueada group. There were significant differences in the acoustic parameters for “Flight” and “Vigil” vocalizations between the groups, suggesting vocal group signature for these sounds. We established that the Smooth-billed Ani has a diverse vocal repertoire, with variations also occurring between groups of the same population. Moreover, we found evidence of vocal group signature in vocalizations used in the context of cohesion, defense and territory maintenance.
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Arato, Jozsef, i W. Tecumseh Fitch. "Phylogenetic signal in the vocalizations of vocal learning and vocal non-learning birds". Philosophical Transactions of the Royal Society B: Biological Sciences 376, nr 1836 (6.09.2021): 20200241. http://dx.doi.org/10.1098/rstb.2020.0241.
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Some animal vocalizations develop reliably in the absence of relevant experience, but an intriguing subset of animal vocalizations is learned: they require acoustic models during ontogeny in order to develop, and the learner's vocal output reflects those models. To what extent do such learned vocalizations reflect phylogeny? We compared the degree to which phylogenetic signal is present in vocal signals from a wide taxonomic range of birds, including both vocal learners (songbirds) and vocal non-learners. We used publically available molecular phylogenies and developed methods to analyse spectral and temporal features in a carefully curated collection of high-quality recordings of bird songs and bird calls, to yield acoustic distance measures. Our methods were initially developed using pairs of closely related North American and European bird species, and then applied to a non-overlapping random stratified sample of European birds. We found strong similarity in acoustic and genetic distances, which manifested itself as a significant phylogenetic signal, in both samples. In songbirds, both learned song and (mostly) unlearned calls allowed reconstruction of phylogenetic trees nearly isomorphic to the phylogenetic trees derived from genetic analysis. We conclude that phylogeny and inheritance constrain vocal structure to a surprising degree, even in learned birdsong. This article is part of the theme issue ‘Vocal learning in animals and humans’.
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Czyżowski, Piotr, Sławomir Beeger, Mariusz Wójcik, Dorota Jarmoszczuk, Mirosław Karpiński i Marian Flis. "Analysis of the Territorial Vocalization of the Pheasants Phasianus colchicus". Animals 12, nr 22 (19.11.2022): 3209. http://dx.doi.org/10.3390/ani12223209.
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The aim of the study was to assess the impact of the duration of the mating season and the time of day on the parameters of the vocalization pheasants (duration of vocalization, frequency of the sound wave, intervals between vocalizations). In the study, pheasant vocalization recorded in the morning (600–800) and in the afternoon (1600–1800) between April and June 2020 was analyzed. In total, the research material consisted of 258 separate vocalizations. After recognition of the individual songs of each bird, frequency-time indicators were collected from the samples to perform statistical analysis of the recorded sounds. The duration of the first syllable [s], the duration of the second syllable [s], the duration of the pause between the syllables [s], the intervals between successive vocalizations [min], and the peak frequency of the syllables I and II [Hz] were specified for each song. The duration of the syllables and the pauses between the syllables and vocalizations were determined through evaluation of spectrograms. The peak amplitude frequencies of the syllables were determined via time-frequency STFT analysis. Statistically significant differences in the distributions of the values of all variables between the analyzed months were demonstrated. The longest duration of total vocalization and the shortest time between vocalizations were recorded in May. Therefore, this month is characterized by the highest frequency and longest duration of vocalization, which is related to the peak of the reproductive period. The time of day was found to exert a significant effect on all variables except the duration of syllable II. The duration of vocalization was significantly shorter in the morning, which indicates that the cooks are more active at this time of day in the study area. The highest peak amplitude frequencies of both syllables were recorded in April, but they decreased in the subsequent months of observation. The time of day was also shown to have an impact on the peak amplitude frequencies, which had the highest values in the morning.
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Pedroza, Angel David, José I. De la Rosa, Rogelio Rosas, Aldonso Becerra, Jesús Villa, Gamaliel Moreno, Efrén González i Daniel Alaniz. "Acoustic Individual Identification in Birds Based on the Band-Limited Phase-Only Correlation Function". Applied Sciences 10, nr 7 (31.03.2020): 2382. http://dx.doi.org/10.3390/app10072382.
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A new technique based on the Band-Limited Phase-Only Correlation (BLPOC) function to deal with acoustic individual identification is proposed in this paper. This is a biometric technique suitable for limited data individual bird identification. The main advantage of this new technique, in contrast to traditional algorithms where the use of large-scale datasets is assumed, is its ability to identify individuals by the use of only two samples from the bird species. The proposed technique has two variants (depending on the method used to analyze and extract the bird vocalization from records): automatic individual verification algorithm and semi-automatic individual verification algorithm. The evaluation of the automatic algorithm shows an average precision that is over 80% for the identification comparatives. It is shown that the efficiencies of the algorithms depend on the complexity of the vocalizations.
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Larsen, O. N., i F. Gollerf. "Role of syringeal vibrations in bird vocalizations". Proceedings of the Royal Society of London. Series B: Biological Sciences 266, nr 1429 (22.08.1999): 1609–15. http://dx.doi.org/10.1098/rspb.1999.0822.
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Blumstein, Daniel T. "The evolution of functionally referential alarm communication". Evolution of Communication 3, nr 2 (31.12.1999): 135–47. http://dx.doi.org/10.1075/eoc.3.2.03blu.
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Many species produce specific alarm vocalizations when they encounter predators. There is considerable interest in the degree to which bird, ground-dwelling sciurid rodent, and primate alarm calls denote the species or type of predator that elicited the vocalization. When there is a tight association between the type or species of predator eliciting an alarm call, and when a played-back alarm call elicits antipredator responses qualitatively similar to those seen when individuals personally encounter a predator, the alarm calls are said to be functionally referential. In this essay I aim to make two simple points about the evolution of functionally referential alarm communication. Firstly, functionally referential communication is likely to be present only when a species produces acoustically distinct alarm vocalizations. Thus, to understand its evolution we must study factors that influence the evolution of alarm call repertoire size. Secondly, and potentially decoupled from the ability to produce acoustically distinctive alarm vocalizations, species must have the perceptual and motor abilities to respond differently to acoustically-distinct alarm vocalizations. Thus, to understand the evolution of functionally referential communication we also must study factors that influence the evolution of context-independent perception. While some factors may select for functionally referential alarm communication, constraints on production or perception may prevent its evolution.
Rozprawy doktorskie na temat "Bird vocalizations"
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May, Les. "Vocalizations in the magpie and the corncrake : methods of analysis, individual differences and geographical variation". Thesis, Manchester Metropolitan University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246260.
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Johnson, Gayle, i n/a. "Vocalizations in the Grey Butcherbird Cracticus Torquatus with Emphasis on Structure in Male Breeding Song: Implications for the Function and Evolution of Song from a Study of a Southern Hemisphere Species". Griffith University. Australian School of Environmental Studies, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20051103.111004.
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An undue focus on Temperate Zone oscines (songbirds or passerines) has led to a geographical bias in interpretation of song frmnction and evolution. This bias led initially to relatively simplistic theories of the ftmnction of bird song with vocalizations divided into 'songs' and 'calls'. Songs were complex, learned vocalizations, given by males in the breeding season, thnctioning in territory defence and mate attraction and stimulation. Calls, on the other hand, were simple innate vocalizations serving more immediate needs such as begging for food and raising an alarm. Female song, where it occurred, was considered an aberration. Further studies suggested that complex songs were associated with mate attraction functions while simpler songs were associated with territory defence. However it became apparent that the distinction between songs and calls was not nearly so clear-cut and the supposed connection between complexity and function in song was questioned. Moreover it was realised that female song could not be dismissed as a mere aberration. Another problem was the ftmnction of the dawn chorus, where research had failed to find a consistent, all-encompassing explanation. Since most studies had been done on Northern Hemisphere songbirds, it was becoming clear that the geographical focus needed to be broadened. The life histories of Northern Hemisphere TemperateZone songbirds are very different from those in many other regions. In contrast to the situation in this zone, maintenance of year-round territory, territory defence by both male and female, life-long social monogamy and extensive female vocalization are widespread in tropical, subtropical and Southern Hemisphere regions. Recently it has been suggested that more intensive studies of vocalizations in these regions might help clariQi some of these issues and consequently an endemic Australian passerine was chosen for the current study. The study focused on the vocalizationsof the grey butcherbird Cracticus torquatus Artamidae, which displays the life history features described above. The main study population was located in the Brisbane suburbs of Rainworth and Bardon. Additional data were gathered from other Brisbane suburbs and bushland sites within the city and at Lake Broadwater near Dalby, Queensland. Vocalizations were initially recorded electronically and analysed using Canary sound editing program. Vocalization data were supplemented using an aural recording method, which was independently checked for reliability. Behavioural data including posture during vocalizations and interactions with other birds were also gathered. Initial investigationsrevealed the existence of two main categories of vocalizations - those given by the family group during the day, all year round and those given at dawn by males during the breeding season. For the focal study populations, group vocalizations were studied throughout the year over several years, however the song given at dawn by males during the breeding season proved to be quite complex and three birds from three territories in the main study area were chosen as case studies. Recordings were made of the vocalizations of the three case study birds over three breeding seasons. Starting and fmishing times (with respect to civil twilight) were recorded in order to determine both changes in song bout duration and starting time throughout the breeding season. Additional birds from the same area, from the other Brisbane suburbs and from the bushland sites were studied to check the validity of conclusions drawn from the case studies. The results of the investigations revealed a vocalization structure that contrasted strongly with the simple picture of bird song drawn from study ofNorthernHemisphere Temperate Zone passerines. The vocalizations given during the day, often referred to as the 'song' of this species, were very different from the early dawn song given by the male during the breeding season. This latter appeared to be song sensu stricto according to the paradigms developed for Northern Hemisphere birds. The thytime vocalizations, however, fitted neither the classic definition of 'song' nor the classic definition of 'call'. This relatively long-term study revealed different starting time patterns and periodicity for thy vocalizations and male breeding season song. Day vocalizations commenced at a fairly constant time with respect to civil twilight throughoutthe year but breeding season song started progressively earlier from the beginning through to the middle of the season then progressively later till the end of the season. Relative finishing time of breeding song however remained constant so that the duration of breeding season song gradually increased then decreased paralleling the change in starting times. A consequence of the two distinct classes of vocalizations was that there were essentially two distinct 'dawn choruses'. One, consisting of group vocals, was sung all year round; the other was given by males singing 'breeding season' song. Since there was no reason the expect that a single function would necessarily be ascribed to both choruses, this raised the possibility that some of the confusion surrounding the ftinction and nature of the 'dawn chorus' originated from a failure to recognize the existence of two such choruses. Variation in time and space showed ifirther differences between the two vocalization classes. The breeding song of each male was distinctly different from that of his neighbours and there was a marked change in the repertoire of any individual from one year to the next. In marked contrast, daytime vocalization repertoires of neighbouring groups were virtually indistinguishable and changed little from year to year. These findings, together with information from recent literature, suggested that the two song classes had a different ontogeny, function and possibly evolution. It was proposed that territory declaration was the function of dawn singing by grey butcherbird family groups but that the function most consistent with adult male dawn song was attraction of females for extra-pair copulations. It was suggested that chorusing itself was to some extent an accidental by-product of the advantage to the individual or group of singing at dawn although a recently proposed function, the social dynamics function, could not be ruled out. Further differences from the Northern Hemisphere situation were detected in subsong. First, subsong was given by birds in their first year and also by adult males. The finding of subsong in adult males was not without precedent as it has been documented previously for a small number of passerines, especially those that change repertoire from year to year. Subsong in young (first year) birds, however, was unusual in that birds practised in small groups rather than in the complete isolation usually associated with subsong. Moreover they did not practise adult male song but instead practised group daytime vocalizations. It was suggested that it was important for birds to learn to sing in company for the important task of group territory defence. Further investigation of the literature and observations during the present study revealed similar vocalization classes and behaviours in other members of the Artamidae and other endemic Australasian taxa. These literature investigations also revealed that the possession two song vocalization classes was quite widespread although they tended to be restricted (but not exclusive) to males rather than found in males and females. These findings led to furtherresearch into the significanceofAustraliain the evolution of songbirds, the role of co-operative breeding in Australianpasserines, and finally to an hypothesis for a possible origin of male bird song. It is suggested that male song arose in a social environment where the male and female were in frequent vocal communication. If the tendency to seek extra-pair copulations (EPCs) and female choice had already been incorporated into the suite of passerine behaviours, it would be necessary to avoid the mate during such activities and the male would need to advertise with a signal distinct from group vocalizations. Early dawn, with poor light conditions, could be a favourable time for these activities. Thus it is proposed that the ancestral condition was with all group members singing most vocalisations, the intermediate situation was similar to that in the grey butcherbird and the 'advanced' condition was where female and other group member vocalizations (other than calls) have dropped out and only male song remains.
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Bolanos, Sittler Pablo Rafael. "Acoustic behavior and ecology of the Resplendent Quetzal Pharomachrus mocinno, a flagship tropical bird species". Thesis, Paris, Muséum national d'histoire naturelle, 2019. http://www.theses.fr/2019MNHN0001/document.
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Le Quetzal Resplendissant Pharomachrus mocinno est une espèce d’oiseau tropical considérée fortement menacée par la perte de son habitat due aux activités humaines. Le Quetzal Resplendissant joue un rôle important de disperseur de graines et constitue le centre de la culture maya passée et présente. Les recherches sur cette espèce couvrent plusieurs aspects de son histoire naturelle et de sa biologie. Néanmoins, à ce jour, il n’y a aucune description détaillée du comportement et de l’écologie acoustiques de cette espèce, condition préalable à une conservation efficace de l'espèce. L’objectif de cette thèse a été d’étudier tout particulièrement le comportement et l’écologie acoustique de P. mocino dans la forêt nuageuse du Guatemala. Une analyse détaillée des vocalisations de P. mocinno, incluant des expériences de propagation de ses vocalisations dans son habitat, a permis d’identifier deux types de vocalisations destinés à la communication à longue distance et deux autres types de vocalisations destinés à la communication à courte distance. La quantification des différences dans les vocalisations territoriales des deux sous-espèces de Quetzals Resplendissants, P. m. mocinno (partie nord de l’Amérique centrale et sud du Mexique) et P. m. costaricensis (sud de l'Amérique centrale) a révélé de nettes différences entre les sous-espèces, ce qui conforterait l'hypothèse d’espèces distinctes. L'observation de l'espèce dans la canopée dense est difficile et la manipulation des individus est controversée en raison de sa grande importance culturelle. De fait, un système acoustique automatique a été mis au point pour suivre l’espèce de manière non invasive. Le système s'est avéré efficace et a produit des résultats révélant des profils de suivis acoustiques en partie dépendants de variables environnementales. Enfin, la communauté acoustique des oiseaux à laquelle P. mocinno appartient a été analysée afin d’évaluer les interactions interspécifiques de compétition. Les recherches développées ici devraient aider aux décisions de conservation futures concernant le Quetzal Resplendissant et son habitat, la forêt nuageuse. Cette recherche montre également que l'écoacoustique peut constituer une stratégie utile pour aborder les problèmes d'écologie et de conservation dans les zones tropicalesThe Resplendent Quetzal Pharomachrus mocinno is a tropical bird considered in a high risk of danger. Degradation of its habitat caused by human activities is the principal menace. The Resplendent Quetzal is important as seed disperser and is the centre of the past and present Mayan culture. The available studies about the species have covered aspects of the natural history and biology. Nevertheless, the description of the acoustic behaviour and ecology, a prerequisite for the conservation of the species, was not available. The general aim of this PhD thesis was to investigate the acoustic behaviour and ecology of P. mocinno in the cloud forest of Guatemala. A detailed analysis of P. mocinno vocalizations, including propagation experiments of these vocalizations in its habitat, led to identify two vocalizations intended for long range, and two for short range communication. Quantification of acoustic parameters in territorial vocalizations of the two subspecies of the Resplendent Quetzal, P. m. mocinno (north part of Central America and Chiapas) and P. m. costaricensis (south part of Central America), revealed clear differences between the subspecies, that could support a species separation hypothesis. . The observation of the species in the dense canopy is difficult and manipulation of individuals is controversial due to its high cultural importance. Then, an automatic acoustic system was developed as a method to study the species in a non-invasive way. The system proved to be efficient and returned results that revealed acoustic patterns linked to environmental variables. Finally, the acoustic community of other bird species P. mocinno belongs to was analysed so that interspecific competition interactions could be assessed. The research here developed should help in future conservation decisions about the Resplendent Quetzal and its habitat, the cloud forest. This research also illustrates that ecoacoustics can be a valuable strategy to tackle ecology and conservation questions in tropical areas
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Groot, Damon. "A deep dive into the Prinia atrogularis complex : A tale of birds and taxonomy". Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-435486.
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The taxonomy of the taxa in the Prinia atrogularis-khasiana-superciliaris complex has changed several times in recent history. To this day, different world bird lists classify this complex as 1–3 species. These classifications are based mainly on morphological comparisons of museum specimens. No study has analysed the songs and genetics of this complex. This thesis focuses on the integrative taxonomy of this complex by analysing and comparing their song and mitochondrial cytochrome b (cytb) gene. Seventeen different variables from in total 172 individual songs were measured and analysed. A linear discriminant analysis showed a clear separation in song between atrogularis, khasiana and the superciliaris group (latter including the taxa superciliaris, erythropleura, klossi, dysancrita and waterstradti). The mitochondrial cytb phylogenetic tree produced using Bayesian inference suggested that atrogularis and khasiana split from superciliaris around 4.9 million years ago (mya), with atrogularis and khasiana splitting from each other around 3.4 mya. Based on the combined results of the song and cytb analysis I propose to recognise three species: Black-throated Prinia Prinia atrogularis, Rufous-crowned Prinia P. khasiana and Hill Prinia P. superciliaris. The study also showed some support for classifying klossi as a separate species, but acquisition of additional information is needed to verify this.
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Soendjoto, Mochamad Arief. "Vocalization behavior of captive loggerhead shrikes (Lanius ludovicianus excubitorides)". Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23427.
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Vocalization behavior of captive loggerhead shrikes was studied at the Avian Science and Conservation Centre of McGill University. In the first stage, calls of two pairs kept in indoor cages were individually recorded not only to catalogue these calls spectrographically and quantitatively but also to use them in identifying the birds sexually. Males vocalized 21 call figures for 16.50% of the observation time and females, 8 call figures for 2.64% of the observation time. Males contiguously delivered 1 to 11 bouts with a mean of 7.25 min for a rate of 6.06 bouts/h; females delivered 1 to 9 bouts with a mean of 4.07 min for a rate of 1.27 bouts/h. Males not only vocalized at a higher rate and longer than females, but also demonstrated trill calls which the females did not do. In the second stage, five pairs were paired in large outdoor breeding pens. Their calls were recorded and current visual displays observed in an effort to understand calls related to breeding behaviors. Two new calls figures vocalized by males as well as 2 call figures by young shrikes were recorded. Each male demonstrated distinctive calls that differed from those of other males during nest-site selection, nest building and copulation, but similar calls during food offering, aggressive and alarm behavior. Despite the call differences, all males performed similar visual displays during the above activities. Conversely, breeding females gave no calls, other than harsh calls during food offering, food begging, aggressive and alarm behaviors.
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Rodrigues, Vanessa Filipa Santos. "Vocalization repertoires variation of Red-billed Chough (Pyrrhocorax pyrrhocorax) population in Portugal". Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/21457.
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Mestrado em Ecologia AplicadaEcological changes in the habitats, induced by climate change or the new paradigms of land use, have had enormous effects in the distribution of species, from the fragmentation of the populations to changes on the genome and/or their behavior. In the case of birds, these constraints may cause changes in vocal repertoires among isolated populations. It was recently confirmed that the two last populations of Red-billed Chough (Pyrrhocorax pyrrhocorax) resident in Portugal (populations of the Serra d'Aire e Candeeiros and Sagres) have an apparent gene-flow restriction, suggesting an isolation that is not explained only by the geographical distance that separates them. In fact, the species has a high dispersion capacity which can not itself justify this restriction of genes between these two populations. Being the species a corvid with a high cognitive capacity and gregarious species, the communication between individuals becomes a vital point to its survival. This work intends to investigate if the gene-flow restriction is due to a social segregation that can be reflected in the variations of the vocal repertoire between the two populations. The aim of this study was to describe and try to understand the main differences between the two populations, as well as possible variations among individuals of the same population (in this case, only in Serra d'Aire e Candeeiros). The results showed that the two studied populations have different repertoires, were described five call types from the population in the Serra d'Aire e Candeeiros and only four in the population of Sagres, thus not existing an evident common vocal repertoire between both populations. It was verified that among the populations the greatest differences are in the duration, maximum frequency and final frequency, where the population from Sagres has smaller durations and maximum frequencies and a higher final frequency than the population from Serra d'Aire e Candeeiros. In the case of the differences between individuals analysed at the intra-population level, these showed individual variations, namely peak frequency and ascending time. Overall, the results seem to corroborate the thesis that the genetic isolation of these populations can be attributed to communication and social barriers.
As mudanças no estado ecológico dos habitats, induzidas por alterações climáticas e/ou por novos paradigmas dos usos do solo, têm tido inúmeras consequências na distribuição das espécies, desde a fragmentação das populações, passando por mudanças no genoma e no seu comportamento. No caso das aves, estes constrangimentos poderão traduzir-se em mudanças nos repertórios vocais entre populações isoladas. Recentemente, confirmou-se que as duas últimas populações de Gralha de Bico Vermelho (Pyrrhocorax pyrrhocorax) residentes em Portugal (populações da Serra d’Aire e Candeeiros e de Sagres) apresentam uma aparente restrição de fluxo genético entre si, sugerindo um isolamento que não se explica apenas pela distância geográfica que as separa. De facto, a espécie apresenta uma elevada capacidade de dispersão o que não pode, só por si, justificar esta restrição de genes. Sendo a espécie um corvídeo com uma elevada capacidade cognitiva e gregária a comunicação entre indivíduos torna-se vital à sua sobrevivência. Este trabalho pretende investigar se a restrição do fluxo genético se deve a uma segregação social que pode refletir-se nas variações do repertório vocal entre as duas populações. Com este intuito, o presente estudo teve como objetivo descrever e tentar compreender quais as principais diferenças entre as duas populações, bem como possíveis variações entre indivíduos de uma mesma população (neste último caso apenas na Serra d’Aire e Candeeiros). Os resultados demonstraram que as duas populações estudadas exibiram repertórios diferentes, com a existência de cinco tipos de vocalizações para a população da Serra na Serra d’Aire e Candeeiros e apenas quatro na população de Sagres, não havendo uma partilha evidente de entre tipos de vocalização comuns a ambas as populações. Verificou-se que entre as populações as maiores diferenças estão na duração, frequência máxima e frequência final, sendo que na população de Sagres as vocalizações têm durações e frequências máximas menores e a frequência final maior que as da população de Serra d’Aire e Candeeiros. No caso das diferenças entre indivíduos analisados ao nível intra-populacional, estes mostraram variações individuais nomeadamente na frequência de pico e do tempo de ascensão. Globalmente, os resultados parecem corroborar a tese de que o isolamento genético destas populações pode ser imputável também a barreiras comunicacionais e sociais.
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Catalano, Ana Luiza Camargo [UNESP]. "Variação do canto de Thamnophilus Doliatus (Linnaeus, 1764) (Aves: Thamnophilidae) em diferentes regiões da América Latina". Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/126504.
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000840982.pdf: 1252667 bytes, checksum: 7069bb98ea402999ba81d7d978408194 (MD5)Este trabalho teve como objetivo analisar e comparar as vocalizações entre indivíduos e subespécies de Thamnophilus doliatus de diferentes localizações da América Latina. Foram analisados 280 cantos de 140 indivíduos diferentes, e as variáveis levadas em consideração foram: número de notas, duração do trecho em sequência, taxa de notas por segundo, frequência de pico total do trecho, duração da nota terminal e frequência de pico da mesma. Os cantos também foram divididos em porções para se calcular a variação de velocidade e de tonalidade (frequência) ao longo dos trechos. As características do canto foram correlacionadas com dados geográficos como latitude, longitude e altitude a fim de se conferir se existe alguma padronização com a localização, e a amostra também foi agrupada em subespécies de acordo com suas localizações para comparações. As variáveis analisadas foram fortemente correlacionadas com a latitude, indicando que indivíduos de localização equatorial emitem cantos com mais notas, mais longos, mais rápidos e com uma nota terminal mais grave do que aqueles localizados ao sul da distribuição. As variáveis também foram correlacionadas com a longitude, incluindo também a frequência de pico. Foram identificadas sete subespécies de acordo com as localidades em que foram gravadas, porém apenas cinco foram utilizadas para comparações. Resultados mostraram uma separação das subespécies intermedius e radiatus pelas significativas diferenças no número de notas, duração do trecho, taxa de notas por segundo e frequência de pico. Também foram feitas comparações com a recém-separada espécie Thamnophilus capistratus, e só foram encontradas diferenças significativas na nota terminal e na variação de frequência ao longo do trecho. Devido às características do canto se mostrarem mais próximas entre diferentes espécies (T. doliatus e T. capistratus), que entre as subespécies de...
The aim of this study was to analyze and to compare vocalizations of individuals of the species Thamnophilus doliatus from different locations of Latin America. 280 loudsongs from 140 individuals were analyzed and the variables taken into account were the following: number of notes, duration of the sequenced patch, note rate (notes per second), overall peak frequency, duration of the terminal note, and peak frequency of the terminal note. The loudsongs were also divided into portions in order to measure the variation of note rate (speed) and pitch (frequency) along the patch. The loudsong characteristics were correlated with geographic factors such as latitude, longitude and altitude to check if there is any acoustic pattern with the location. Also, the sample was clustered into subspecies for comparisons. The analyzed variables were strongly correlated with latitude, where individuals from equatorial locations had loudsongs with more notes, longer in duration, faster in note rate and a terminal note lower in peak frequency. The variables also appeared to be significantly correlated with longitude, including as well the overall peak frequency. Seven subspecies were identified according to their locations, however, only five of them were used for comparisons. Results showed a separation of the intermedius and radiatus subspecies due to their significant divergence in number of notes, patch duration, note rate and peak frequency. Comparisons with the recently separated species Thamnophilus capistratus were also made and no significant variation were found in the number of notes and total duration, but there were differences in note rate, overall peak frequency, peak frequency and duration of the terminal note. Because song characteristics between the different species (T. doliatus and T. capistratus) presented to be more similar than among the subspecies of T. doliatus, raises the question of the existence of more than one species within ...
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Catalano, Ana Luiza Camargo. "Variação do canto de Thamnophilus Doliatus (Linnaeus, 1764) (Aves: Thamnophilidae) em diferentes regiões da América Latina /". Botucatu, 2015. http://hdl.handle.net/11449/126504.
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Orientador: Reginaldo José DonatelliBanca: Manoel Dias Filho
Banca: Carolina Demetrio Ferreira
Resumo: Este trabalho teve como objetivo analisar e comparar as vocalizações entre indivíduos e subespécies de Thamnophilus doliatus de diferentes localizações da América Latina. Foram analisados 280 cantos de 140 indivíduos diferentes, e as variáveis levadas em consideração foram: número de notas, duração do trecho em sequência, taxa de notas por segundo, frequência de pico total do trecho, duração da nota terminal e frequência de pico da mesma. Os cantos também foram divididos em porções para se calcular a variação de velocidade e de tonalidade (frequência) ao longo dos trechos. As características do canto foram correlacionadas com dados geográficos como latitude, longitude e altitude a fim de se conferir se existe alguma padronização com a localização, e a amostra também foi agrupada em subespécies de acordo com suas localizações para comparações. As variáveis analisadas foram fortemente correlacionadas com a latitude, indicando que indivíduos de localização equatorial emitem cantos com mais notas, mais longos, mais rápidos e com uma nota terminal mais grave do que aqueles localizados ao sul da distribuição. As variáveis também foram correlacionadas com a longitude, incluindo também a frequência de pico. Foram identificadas sete subespécies de acordo com as localidades em que foram gravadas, porém apenas cinco foram utilizadas para comparações. Resultados mostraram uma separação das subespécies intermedius e radiatus pelas significativas diferenças no número de notas, duração do trecho, taxa de notas por segundo e frequência de pico. Também foram feitas comparações com a recém-separada espécie Thamnophilus capistratus, e só foram encontradas diferenças significativas na nota terminal e na variação de frequência ao longo do trecho. Devido às características do canto se mostrarem mais próximas entre diferentes espécies (T. doliatus e T. capistratus), que entre as subespécies de...
Abstract: The aim of this study was to analyze and to compare vocalizations of individuals of the species Thamnophilus doliatus from different locations of Latin America. 280 loudsongs from 140 individuals were analyzed and the variables taken into account were the following: number of notes, duration of the sequenced patch, note rate (notes per second), overall peak frequency, duration of the terminal note, and peak frequency of the terminal note. The loudsongs were also divided into portions in order to measure the variation of note rate (speed) and pitch (frequency) along the patch. The loudsong characteristics were correlated with geographic factors such as latitude, longitude and altitude to check if there is any acoustic pattern with the location. Also, the sample was clustered into subspecies for comparisons. The analyzed variables were strongly correlated with latitude, where individuals from equatorial locations had loudsongs with more notes, longer in duration, faster in note rate and a terminal note lower in peak frequency. The variables also appeared to be significantly correlated with longitude, including as well the overall peak frequency. Seven subspecies were identified according to their locations, however, only five of them were used for comparisons. Results showed a separation of the intermedius and radiatus subspecies due to their significant divergence in number of notes, patch duration, note rate and peak frequency. Comparisons with the recently separated species Thamnophilus capistratus were also made and no significant variation were found in the number of notes and total duration, but there were differences in note rate, overall peak frequency, peak frequency and duration of the terminal note. Because song characteristics between the different species (T. doliatus and T. capistratus) presented to be more similar than among the subspecies of T. doliatus, raises the question of the existence of more than one species within ...
Mestre
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ARRUDA, André Ribeiro de. "Bioecologia e dinâmica temporal de Pseudoseisura cristata (Passeriformes) sob influência dos períodos climáticos". Universidade Federal Rural de Pernambuco, 2013. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/5409.
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Given the strong relationship between the birds and the environments where they live, this study aimed to characterize the temporal dynamics of molts, breeding, abundance and vocalizations of Pseusoseisura cristata, as well as the influence of climatic periods under these aspects. Data collection was monthly between June 2011 and May 2012. The Caatinga area studied is located in the municipality of São José do Egito, Pernambuco - Brazil. Nine mist nets were used to capture and record brood patch and molts. The sampling effort was equal to 3564 hours/net. The abundance was estimated through three "strip transects" and the temporal structure of vocalizations were recorded through sound contacts with unlimited radius. It was verified that the climatic periods influence the molts and breeding. Both occur during the rainy season, since they require a large supply of resources to meet the energy demands of the processes. The seasonality also exerts a subtle influence on the temporal structure of vocalizations, forming different patterns for the dry and rainy seasons. However, these patterns must be further linked to breeding the rainfall itself. The abundance in turn, was not altered as a function of climate, revealed that this species is better adapted to climatic variations of the environment.
Diante da forte relação entre as aves e os ambientes onde vivem, esta pesquisa objetivou caracterizar bioecologicamente a dinâmica temporal de mudas, reprodução, vocalizações e abundância de Pseusoseisura cristata, bem como a influência dos períodos climáticos sob estes aspectos. A coleta de dados foi mensal entre junho de 2011 e maio de 2012. A área de Caatinga estudada localiza-se no município de São José do Egito, Pernambuco - Brasil. Nove redes de neblina foram utilizadas para captura e registro de mudas e placas de incubação, sendo o esforço amostral igual a 3564 horas/rede. A abundância foi estimada através de três “strip transects” e a estrutura temporal de vocalizações foi registrada através de contatos sonoros com raio ilimitado. Pôde-se verificar que há influência dos períodos climáticos sobre as mudas e sobre a reprodução. Ambos ocorrem durante o período chuvoso, pois necessitam de uma grande oferta de recursos para suprir a demanda energética dos processos. A sazonalidade também exerce uma sutil influência sobre a estrutura temporal das vocalizações, formando padrões diferentes para os períodos seco e chuvoso. No entanto, estes padrões devem estar mais ligados à reprodução do que à pluviosidade propriamente dita. A abundância por sua vez, não foi alterada em função do clima, revelando que a espécie apresenta adaptabilidade às variações climáticas do ambiente.
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Cardoso, Gonçalo Canelas. "Evolução de características sexuais secundárias no género Serinus (aves, Fringillidae) : canto e coloração". Doctoral thesis, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, 2005. http://hdl.handle.net/10400.12/1620.
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Tese de Doutoramento em Biologia, especialidade de Ecologia, apresentada à Faculdade de Ciências e Tecnologia, Universidade de CoimbraEstudámos a dinâmica evolutiva e aspectos selectivos das duas características sexuais secundárias mais proeminentes em passeriformes – canto e coloração – por meio de experimentação no serino (Serinus serinus) e de análises comparativas no género Serinus. A velocidade e frequência aguda das canções de serino são extremas quando comparadas com as restantes espécies do género, o que sugere evolução por selecção sexual. Em experiências comportamentais, fêmeas de serino manifestaram preferência por canções agudas; canções rápidas, pelo contrário, inibiram as respostas das fêmeas. Os machos de serino não discriminaram quanto à frequência das canções, mas foram inibidos por canções rápidas. Estes resultados sugerem pressões selectivas distintas: a evolução da frequência de canto é compatível com um processo de selecção inter-sexual, e a velocidade das canções parece ser um sinal agonístico, passível portanto de selecção intra-sexual. Documentamos um padrão de diversificação evolutiva intensa do canto no género Serinus, que se sobrepõe a constrangimentos vocais importantes. A evolução do canto neste género foi apenas parcialmente acompanhada por adaptação vocal às características das canções nas diferentes espécies. Tal deve-se, pelo menos em parte, ao facto de várias espécies evoluírem características de complexidade silábica em relação às quais detectámos custos de produção vocal fortes. Diferentes sintaxes de canto correlacionam-se com aspectos distintos de desempenho vocal, o que sugere formas de selecção indirecta sobre a sintaxe. A coloração apresenta um padrão de evolução intensa em ambos os sexos de Serinus spp., como é típico de características sexualmente seleccionadas. Mostramos que a coloração conspícua em fêmeas evoluiu sobretudo por constrangimento sexual, pelo que advertimos contra a inferência de causalidade evolutiva a partir do valor adaptativo presente de ornamentos femininos. Os principais eixos de complexidade do canto e elaboração da coloração estão fortemente correlacionados entre as espécies de Serinus, e tendem a variar com aspectos do habitat que indicam maior intensidade de selecção sexual, sugerindo que selecção sexual é o processo selectivo mais determinante na sua evolução.
Książki na temat "Bird vocalizations"
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MacKay, Barry Kent. Bird sounds. Mechanicsburg, PA: Stackpole Books, 2001.
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L, Silaeva O., i Sokolov Vladimir Evgenʹevich, red. Talking birds. Moscow: Nauka Publishers, 1992.
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Slater, P. J. B. 1942-, red. Bird song: Biological themes and variations. Wyd. 2. Cambridge [England]: Cambridge University Press, 2008.
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Catchpole, Clive. Bird song: Biological themes and variations. Wyd. 2. Cambridge [England]: Cambridge University Press, 2008.
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Slater, P. J. B. 1942-, red. Bird song: Biological themes and variations. Cambridge [England]: New York, NY, USA, 1995.
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Catchpole, Clive. Bird song: Biological themes and variations. Wyd. 2. Cambridge: Cambridge University Press, 2008.
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Dalton, Michael S. Another kind of mind: A talking bird masters English. Clearwater, Fla: Arielle Pub., 2007.
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Roth, Sally. Attracting songbirds to your backyard: Hundreds of easy ways to bring the music and beauty of songbirds to your yard. Emmaus, Pa: Rodale, 2012.
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L, Silaeva O., i Sokolov Vladimir Evgenʹevich, red. Govori͡a︡shchie ptit͡s︡y. Moskva: "Nauka", 1990.
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Colver, Kevin J. Calls of ducks and geese. Mechanicsburg, PA: Stackpole Books, 2008.
Znajdź pełny tekst źródłaCzęści książek na temat "Bird vocalizations"
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Martens, Jochen. "12. Vocalizations and Speciation of Palearctic Birds". W Ecology and Evolution of Acoustic Communication in Birds, redaktorzy Donald E. Kroodsma i Edward H. Miller, 221–40. Ithaca, NY: Cornell University Press, 2020. http://dx.doi.org/10.7591/9781501736957-019.
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"Analyzing the Structure of Bird Vocalizations and Language: Finding Common Ground". W Birdsong, Speech, and Language. The MIT Press, 2013. http://dx.doi.org/10.7551/mitpress/9322.003.0017.
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Rogers, Susan Fox. "Chiuit". W Learning the Birds, 197–207. Cornell University Press, 2022. http://dx.doi.org/10.7591/cornell/9781501762246.003.0015.
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This chapter recounts the author's birding trip to Nome, Alaska, where she looked for the Bristle-thighed Curlew. The most common call of the Bristle-thighed is a basic chiu-eet, which is why the Yupʻik Eskimo call them the Chiuit. The Curlew's song, however, is one that has been described in all of its layered complexity. Nuptial vocalizations include “Sweeping portamentos, dramatic frequency spikes, and multiple patterns of sequential frequency shifts.” Additionally, there is the low whistle “similar to warning beeps of dump trucks in reverse” and the complex whistle and the whine. Empty land is what the Curlew seems to prefer. When it is not in the expanse of Alaska in summer, it spends its winter on islands in Oceania and can be seen on beaches on Caroline Atoll or on lawns on Midway Atoll.
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"Peripheral Mechanisms of Vocalization in Birds: A Comparison with Human Speech". W Birdsong, Speech, and Language. The MIT Press, 2013. http://dx.doi.org/10.7551/mitpress/9322.003.0026.
Pełny tekst źródłaStreszczenia konferencji na temat "Bird vocalizations"
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O'Reilly, Colm, Nicola M. Marples, David J. Kelly i Naomi Harte. "Quantifying difference in vocalizations of bird populations". W Interspeech 2015. ISCA: ISCA, 2015. http://dx.doi.org/10.21437/interspeech.2015-677.
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Barmatz, Hagai, Dana Klein, Yoni Vortman, Sivan Toledo i Yizhar Lavner. "Segmentation and Analysis of Bird Trill Vocalizations". W 2018 IEEE International Conference on the Science of Electrical Engineering in Israel (ICSEE). IEEE, 2018. http://dx.doi.org/10.1109/icsee.2018.8646070.
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Deneva, Prolet, i Todor Ganchev. "Automatic recognition of the characteristic melody of bird vocalizations". W 2019 International Conference on Biomedical Innovations and Applications (BIA). IEEE, 2019. http://dx.doi.org/10.1109/bia48344.2019.8967458.
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Suzuki, Reiji, Hao Zhao, Shinji Sumitani, Shiho Matsubayashi, Takaya Arita, Kazuhiro Nakadai i Hiroshi G. Okuno. "Visualizing Directional Soundscapes of Bird Vocalizations Using Robot Audition Techniques". W 2021 IEEE/SICE International Symposium on System Integration (SII). IEEE, 2021. http://dx.doi.org/10.1109/ieeeconf49454.2021.9382639.
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Barmatz, Hagai, Dana Klein, Yoni Vortman, Sivan Toledo i Yizhar Lavner. "A Method for Automatic Segmentation and Parameter Estimation of Bird Vocalizations". W 2019 International Conference on Systems, Signals and Image Processing (IWSSIP). IEEE, 2019. http://dx.doi.org/10.1109/iwssip.2019.8787282.
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Patti, Anand, i Geoffrey A. Williamson. "Methods for classification of nocturnal migratory bird vocalizations using Pseudo Wigner-Ville Transform". W ICASSP 2013 - 2013 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2013. http://dx.doi.org/10.1109/icassp.2013.6637750.
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Suzuki, Reiji, Shinji Sumitani, Zachary Harlow, Shiho Matsubayashi, Takaya Arita, Kazuhiro Nakadai i Hiroshi G. Okuno. "Extracting Bird Vocalizations from a Complex Natural Soundscape in Forests Using Robot Audition Techniques". W 2023 IEEE/SICE International Symposium on System Integration (SII). IEEE, 2023. http://dx.doi.org/10.1109/sii55687.2023.10039198.
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Sumitani, Shinji, Reiji Suzuki, Shiho Matsubayashi, Takaya Arita, Kazuhiro Nakadai i Hiroshi G. Okuno. "Extracting the Relationship between the Spatial Distribution and Types of Bird Vocalizations Using Robot Audition System HARK". W 2018 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS). IEEE, 2018. http://dx.doi.org/10.1109/iros.2018.8594130.
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Rassak, Simna, M. Nachamai i Murthy A. Krishna. "Survey study on the methods of bird vocalization classification". W 2016 IEEE International Conference on Current Trends in Advanced Computing (ICCTAC). IEEE, 2016. http://dx.doi.org/10.1109/icctac.2016.7567337.
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Jiang, Weili, Qian Xue, Xudong Zheng, Jeppe H. Rasmussen i Coen Elemans. "High-Fidelity Fluid-Structure Interaction Modeling of Bird Vocalization in Syrinx". W 2018 AIAA Aerospace Sciences Meeting. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-0578.
Pełny tekst źródłaRaporty organizacyjne na temat "Bird vocalizations"
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Buehler, David, Richard Fischer, John Wilkerson, Stacy Worley, David Smith, Emily Hockman i Stephanie Prevost. Demonstration of autonomous aerial acoustic recording systems to inventory Department of Defense bird populations. Engineer Research and Development Center (U.S.), marzec 2021. http://dx.doi.org/10.21079/11681/39921.
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This demonstration project addressed the Department of Defense need for innovative technology for monitoring avian populations in inaccessible areas. This report presents results from field validation tests for an autonomous aerial acoustic recording system, a helium-filled weather balloon that transported an instrument payload over inaccessible areas (e.g., ordnance impact areas) to record avian vocalizations.