Relevant bibliographies by topics / Signature whistle

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  2. Dissertations / Theses
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Academic literature on the topic 'Signature whistle'

Author: Grafiati
Published: 25 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Signature whistle"

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Probert, Rachel, Anna Bastian, Simon H. Elwen, Bridget S. James, and Tess Gridley. "Vocal correlates of arousal in bottlenose dolphins (Tursiops spp.) in human care." PLOS ONE 16, no. 9 (September 1, 2021): e0250913. http://dx.doi.org/10.1371/journal.pone.0250913.

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Human-controlled regimes can entrain behavioural responses and may impact animal welfare. Therefore, understanding the influence of schedules on animal behaviour can be a valuable tool to improve welfare, however information on behaviour overnight and in the absence of husbandry staff remains rare. Bottlenose dolphins (Tursiops spp.) are highly social marine mammals and the most common cetacean found in captivity. They communicate using frequency modulated signature whistles, a whistle type that is individually distinctive and used as a contact call. We investigated the vocalisations of ten dolphins housed in three social groups at uShaka Sea World dolphinarium to determine how patterns in acoustic behaviour link to dolphinarium routines. Investigation focused on overnight behaviour, housing decisions, weekly patterns, and transitional periods between the presence and absence of husbandry staff. Recordings were made from 17h00 – 07h00 over 24 nights, spanning May to August 2018. Whistle (including signature whistle) presence and production rate decreased soon after husbandry staff left the facility, was low over night, and increased upon staff arrival. Results indicated elevated arousal states particularly associated with the morning feeding regime. Housing in the pool configuration that allowed observation of staff activities from all social groups was characterised by an increase in whistle presence and rates. Heightened arousal associated with staff presence was reflected in the structural characteristics of signature whistles, particularly maximum frequency, frequency range and number of whistle loops. We identified individual differences in both production rate and the structural modification of signature whistles under different contexts. Overall, these results revealed a link between scheduled activity and associated behavioural responses, which can be used as a baseline for future welfare monitoring where changes from normal behaviour may reflect shifts in welfare state.
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Madsen, P. T., F. H. Jensen, D. Carder, and S. Ridgway. "Dolphin whistles: a functional misnomer revealed by heliox breathing." Biology Letters 8, no. 2 (September 7, 2011): 211–13. http://dx.doi.org/10.1098/rsbl.2011.0701.

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Delphinids produce tonal whistles shaped by vocal learning for acoustic communication. Unlike terrestrial mammals, delphinid sound production is driven by pressurized air within a complex nasal system. It is unclear how fundamental whistle contours can be maintained across a large range of hydrostatic pressures and air sac volumes. Two opposing hypotheses propose that tonal sounds arise either from tissue vibrations or through actual whistle production from vortices stabilized by resonating nasal air volumes. Here, we use a trained bottlenose dolphin whistling in air and in heliox to test these hypotheses. The fundamental frequency contours of stereotyped whistles were unaffected by the higher sound speed in heliox. Therefore, the term whistle is a functional misnomer as dolphins actually do not whistle, but form the fundamental frequency contour of their tonal calls by pneumatically induced tissue vibrations analogous to the operation of vocal folds in terrestrial mammals and the syrinx in birds. This form of tonal sound production by nasal tissue vibrations has probably evolved in delphinids to enable impedance matching to the water, and to maintain tonal signature contours across changes in hydrostatic pressures, air density and relative nasal air volumes during dives.
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Logominova, I. V., A. V. Agafonov, and Gorbunov R. V. "Spatial-temporal dynamics of a local population of Black Sea Bottlenose dolphins (tursiops truncatus ponticus barabash, 1940): visual and acoustic methods of description." Океанология 59, no. 1 (April 18, 2019): 108–15. http://dx.doi.org/10.31857/s0030-1574591108-115.

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This work is devoted to research of the Sudak – Novy Svet (Crimea) local population of Black Sea Bottlenose dolphins. Observations and acoustic records were carried out all the year round in 2014 and 2015. Along with visual identification of individuals, for the first time in our country the method of «acoustic identification» was applied (according to the made catalog of «signature whistles»). «Signature whistles» are defined as tonal signals having a frequency contour, unique for each animal, and dominating in its repertoire. In such aspect «signature whistle» can be considered as a peculiar «acoustic marker» of this individual. In the analysis of all volume of the registered whistles of dolphins (about 30 thousands of signals) 206 dominating types (i.e. «signature whistles») have been defined. On the basis of comparison of visual and acoustic data the structure of groups, making the studied population, has been described; the seasonal picture of visit of the water area by various groups has been presented as well as «transit» and «resident» groups have been allocated.
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Tyack, Peter. "Whistle repertoires of two bottlenosed dolphins, Tursiops truncatus: mimicry of signature whistles?" Behavioral Ecology and Sociobiology 18, no. 4 (February 1986): 251–57. http://dx.doi.org/10.1007/bf00300001.

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Tyack, P. L. "ANIMAL BEHAVIOR: Dolphins Whistle a Signature Tune." Science 289, no. 5483 (August 25, 2000): 1310–11. http://dx.doi.org/10.1126/science.289.5483.1310.

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Noh, Geontae, Ji Young Chun, and Ik Rae Jeong. "Strongly Unforgeable Ring Signature Scheme from Lattices in the Standard Model." Journal of Applied Mathematics 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/371924.

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In a ring signature scheme, a user selects an arbitrary ring to be able to sign a message on behalf of the ring without revealing the signer’s identity. Whistle-blowers especially find this useful. To date, various ring signature schemes have been proposed, all considered to be secure as existentially unforgeable with respect to insider corruption; that is, an adversary who chooses ring-message pairs for which he requests signatures, corrupts honest users, and obtains their signing keys can not produce forgeries for new ring-message pairs. Lattice-based ring signature schemes offer lower computational overhead and security from quantum attacks. In this paper, we offer a lattice-based scheme. We begin by showing that the existing ring signature schemes are not sufficiently secure, because existential unforgeability still permits a signer to potentially produce a new signature on previously signed messages. Furthermore, we show that existing ring signature schemes from lattices are not even existentially unforgeable with respect to insider corruption. We then improve previous schemes by applying, for the first time, the concept of strong unforgeability with respect to insider corruption to a ring signature scheme in lattices. This offers more security than any previous ring signature scheme: adversaries cannot produce new signatures for any ring-message pair, including previously signed ring-message pairs.
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Longden, Emma G., Simon H. Elwen, Barry McGovern, Bridget S. James, Clare B. Embling, and Tess Gridley. "Mark–recapture of individually distinctive calls—a case study with signature whistles of bottlenose dolphins (Tursiops truncatus)." Journal of Mammalogy 101, no. 5 (August 17, 2020): 1289–301. http://dx.doi.org/10.1093/jmammal/gyaa081.

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Abstract Robust abundance estimates of wild animal populations are needed to inform management policies and are often obtained through mark–recapture (MR) studies. Visual methods are commonly used, which limits data collection to daylight hours and good weather conditions. Passive acoustic monitoring offers an alternative, particularly if acoustic cues are naturally produced and individually distinctive. Here we investigate the potential of using individually distinctive signature whistles in a MR framework and evaluate different components of study design. We analyzed signature whistles of common bottlenose dolphins, Tursiops truncatus, using data collected from static acoustic monitoring devices deployed in Walvis Bay, Namibia. Signature whistle types (SWTs) were identified using a bout analysis approach (SIGnature IDentification [SIGID]—Janik et al. 2013). We investigated spatial variation in capture by comparing 21 synchronized recording days across four sites, and temporal variation from 125 recording days at one high-use site (Aphrodite Beach). Despite dolphin vocalizations (i.e., echolocation clicks) being detected at each site, SWTs were not detected at all sites and there was high variability in capture rates among sites where SWTs were detected (range 0–21 SWTs detected). At Aphrodite Beach, 53 SWTs were captured over 6 months and discovery curves showed an initial increase in newly detected SWTs, approaching asymptote during the fourth month. A Huggins closed capture model constructed from SWT capture histories at Aphrodite Beach estimated a population of 54–68 individuals from acoustic detection, which overlaps with the known population size (54–76 individuals—Elwen et al. 2019). This study demonstrates the potential power of using signature whistles as proxies for individual occurrence and in MR abundance estimation, but also highlights challenges in using this approach.
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Janik, V. M., L. S. Sayigh, and R. S. Wells. "Signature whistle shape conveys identity information to bottlenose dolphins." Proceedings of the National Academy of Sciences 103, no. 21 (May 12, 2006): 8293–97. http://dx.doi.org/10.1073/pnas.0509918103.

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Janik, V. M., Guido Dehnhardt, and Dietmar Todt. "Signature whistle variations in a bottlenosed dolphin, Tursiops truncatus." Behavioral Ecology and Sociobiology 35, no. 4 (October 1, 1994): 243–48. http://dx.doi.org/10.1007/s002650050094.

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Janik, Vincent M., Dietmar Todt, and G. Dehnhardt. "Signature whistle variations in a bottlenosed dolphin, Tursiops truncatus." Behavioral Ecology and Sociobiology 35, no. 4 (October 1994): 243–48. http://dx.doi.org/10.1007/bf00170704.

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Dissertations / Theses on the topic "Signature whistle"

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Stuby, Richard George. "A stochastic measure of similarity between dolphin signature whistles /." This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-03042009-040851/.

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Rylander, Tilde. "The Whistle caller concept - Signature whistles as call-over signals for Bottlenose dolphins (Tursiops truncatus) under human care." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-176922.

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Dolphins use stereotyped, individually distinctive, frequency modulated whistles, referred to as signature whistles, in order to broadcast their identity. In this study, we trained six dolphins at Kolmården Zoo, Sweden, to be called over, either upon hearing their own signature whistle (SW) or upon hearing a biologically irrelevant ”trivial” sound (TS), with the aim to prove the Whistle caller concept. The Whistle caller concept is based on the fact that dolphins occasionally use other dolphins’ signature whistles in order to address specific group members and convene.  Our hypotheses were that (1) dolphins call-over trained using their SW would learn the behaviour faster than dolphins trained using TSs, and (2) dolphins trained with their SW would be able to discriminate between different SWs better than dolphins trained with a TS would be at discriminating between different TSs.  Three out of three dolphins were successfully call-over trained using their SW, and two out of three dolphins using their assigned TS. When discriminating between different sounds, two of the dolphins trained using their SW performed significantly better than one of the dolphins trained using a TS. However, there were large intra-group differences in the results, indicating that we cannot eliminate the possibility that these results stem from individual differences in these dolphins’ ability to learn new behaviours overall, rather than an understanding of the sounds they heard. We suggest that future studies focus on (1) male-female differences in discrimination success when applying the Whistle caller concept, (2) how the characteristics of the trivial sounds affect discrimination success, and (3) the option of calling more than one animal at a time by sending out several SWs in succession.
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Hill, Mandy Lee. "Signature whistle productions, development, and perception in free-ranging bottlenose dolphins /." Electronic version (PDF), 2002. http://dl.uncw.edu/etd/2002/hillm/mandyhill.html.

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Gridley, Teresa. "Geographic and species variation in bottlenose dolphin (Tursiops spp.) signature whistle types." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/1910.

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Geographic variation in the whistle vocalisations of dolphins has previously been reported. However, most studies have focused on the whole whistle repertoire, with little attempt to classify sounds into biologically relevant categories. Common bottlenose dolphins (Tursiops truncatus) use individually distinctive signature whistles which are thought to help maintain contact between conspecifics at sea. These whistles may show a different kind of variation between populations than non-signature whistles. Here I investigate signature whistle use and variation in the two recognised species of bottlenose dolphins (T. truncatus and T. aduncus) from populations inhabiting the coastal waters of the North America, Scotland, South Africa, Tanzania, Japan, Australia and New Zealand, and one captive colony. I identified likely signature whistles (signature whistles types, SWTs) from acoustic recordings by combining two novel techniques: automated contour categorisation in ARTwarp (Deecke and Janik, 2006) and a specific bout analysis based on the timing of signature whistle production in T. truncatus termed SIGID (Janik et al. in press). Three ways of categorising the contours were tested and between 87 and 111 SWTs were identified in total. Repeated emissions of stereotyped contours were apparent in the repertoire of all T. aduncus populations using both automated and human observer categorisation, providing good evidence for signature whistle use in this species. There was significant inter-specific variation in the frequency parameters, looping patterns and duration of SWTs. Inflection points, duration and measures of SWT complexity showed high variation within populations, suggesting inter- and intra-individual modification of these parameters, perhaps to enhance identity encoding or convey motivational information. Using 328 bases of the mtDNA control region, I found high levels of population differentiation (FST and φST) within the genus Tursiops. These data do not support a link between mtDNA population differentiation and variability in call type. Instead, morphological variations at the species level, and learned differences at the population level, better explain the variation found.
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Stuby, Richard George Jr. "A stochastic measure of similarity between dolphin signature whistles." Thesis, Virginia Tech, 1993. http://hdl.handle.net/10919/31408.

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Bottlenose dolprlin (Tursiops trunratus) whistles are currently studied by subjective visual comparison of whistle spectrograms. This thesis describes the novel use of stochastic modeling to automate the comparison of dolphin whistles and to yield an objective, quantitative measure of whistle similarity. The relationship of bottlenose dolphin whistle production to a model of human speech production is discussed, providing a basis for the use of human speech recognition techniques for creating whistle models. Discrete hidden Markov models based on vector quantization of linear prediction coefficients are used to create whistle models based on statistical information derived from a sample set of dolphin whistles. Whistle model comparison results are presented indicating that evaluation of bottlenose dolphin whistles via hidden Markov modeling provides an objective measure of similarity between whistles. The results also demonstrate that hidden Markov models provide robustness against the effects of temporal and frequency variance in the comparison of whistles. The extensibility of stochastic modeling techniques to other animal vocalizations is discussed and possibilities for further work in areas such as the determination of possible structural components, similar to phonemes in human speech, is provided.
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Sayigh, Laela Suad. "Development and functions of signature whistles of free-ranging bottlenose dolphins, Tursiops truncatus." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12900.

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Rashley, Gemma. "Investigating the potential for individually distinctive signature whistles to be used in mark-recapture of common bottlenose dolphins (Tursiops truncatus)." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/23784.

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Mark-recapture is used to investigate the abundance, survival and social relationships and even individual-specific habitat use of a number of species. Several studies suggest that individually distinctive acoustic signals could be used in a mark-recapture framework. We investigated the potential of using individually distinctive signature whistles of bottlenose dolphins, Tursiops truncatus. Acoustic and photo identification data were collected simultaneously from a small population of common bottlenose dolphins in Walvis Bay, Namibia, between 2009 and 2015. Visual classification and bout analysis was used to identify signature whistle types. Photos were graded for quality and fins for distinctiveness and matched to a pre-existing catalogue of individuals. Whistle data was graded on signal to noise ratio. Abundance was calculated for both signature whistles and photographic data for the years 2011, 2012 and 2015 separately using Huggins closed models. Since not all animals were used in the photographic mark-recapture and the signature whistles of all animals were not recorded in all encounters, it was necessary to extrapolate mark-recapture estimates up to total population size. Two methods of calculating theta (the proportion detected or 'marked') for acoustic data were investigated, one calculated from the field group size and another based solely on acoustic data. An attempt to match individuals with their signature whistle type was also conducted through a process of encounter matrices and elimination. Assuming that photographic mark-recapture data provides the most accurate measure of population size (2011=65, 2012=82, 2015=83 animals estimated), the acoustic abundance estimate extrapolated using a theta calculated from field group size overestimated the population (2011=131, 2012=243, 2015=133), while the acoustic abundance extrapolated using solely acoustic data gave an underestimation (2011=44, 2012=63, 2015=78). Differences between the acoustic estimates and photo identification estimates were between a 25% decrease and 121% increase. Seventeen signature whistle types were used in the matching process, 3 out of which were confidently matched with individuals and a further 3 were matched through the process of elimination. Overall, this study shows that acoustic abundance estimates using signature whistle data has the potential to provide a conservative estimate of abundance compared to photographic methods. However, estimates were effected by how theta was estimated and further studies to better estimate theta are required to improve abundance estimates from signature whistle data.
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King, Stephanie L. "The vocal imitation of bottlenose dolphin (Tursiops truncatus) signature whistles : their use in vocal matching interactions and their role as vocal labels." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3184.

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The bottlenose dolphin uses vocal learning to develop its own unique acoustic signal. This signal encodes the identity of the signaller, and is known as the animal's signature whistle. The dolphin's ability for vocal learning means that the signature whistle of one animal may be found in the vocal repertoire of other animals. This copying of signature whistle types may allow conspecifics to label or address one another. This thesis investigated the use of signature whistle copying in both captive and wild animals. Dolphins have been known to rapidly imitate each other's signature whistle in vocal matching exchanges. This matching of sounds has an aggressive connotation in songbirds, yet the function in bottlenose dolphins remains unclear. I have shown, through playback experiments with captive animals, that signature whistle matching in dolphins is not aggressive but appears to be affiliative, and may be used as a tool to initiate contact with the signature whistle owner. In addition, the rapid matching of whistle types in wild dolphins appears to play a specific role in their foraging behaviour, indicating the function of vocal matching may indeed be multi-faceted. This thesis also uses a unique dataset to extensively describe the occurrence of signature whistle copying in wild animals. The imitation of individual signature whistles occurred almost exclusively between close associates during separations. All copies were accurate representations of the original signature whistle, but were clearly recognisable due to fine-scale differences in selected acoustic parameters, and are therefore unlikely to be used deceptively. Finally, I provide evidence that wild bottlenose dolphins respond to hearing a copy of their own signature whistle by calling back. This offers support to the notion that signature whistles function as distinctive labels that are used to address individuals, and perhaps even label them referentially.
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Books on the topic "Signature whistle"

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Sayigh, Laela Suad. Development and functions of signature whistles of free-ranging bottlenose dolphins, Tursiops truncatus. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1992.

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Thompson, Vicki Lewis, Julie Elizabeth Leto, and Kate Hoffmann. A Fare To Remember: Just Whistle\Driven To Distraction\Taken For A Ride (Harlequin Signature Select). Harlequin, 2006.

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Book chapters on the topic "Signature whistle"

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Caldwell, Melba C., David K. Caldwell, and Peter L. Tyack. "Review of the Signature-Whistle Hypothesis for the Atlantic Bottlenose Dolphin." In The Bottlenose Dolphin, 199–234. Elsevier, 1990. http://dx.doi.org/10.1016/b978-0-12-440280-5.50014-7.

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Sayigh, Laela S., and Vincent M. Janik. "Signature Whistles." In Encyclopedia of Marine Mammals, 854–56. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-12-804327-1.00228-4.

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Sayigh, Laela S., and Vincent M. Janik. "Signature Whistles." In Encyclopedia of Marine Mammals, 1014–16. Elsevier, 2009. http://dx.doi.org/10.1016/b978-0-12-373553-9.00235-2.

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Sayigh, L. S., and V. M. Janik. "Dolphin Signature Whistles." In Encyclopedia of Animal Behavior, 553–61. Elsevier, 2010. http://dx.doi.org/10.1016/b978-0-08-045337-8.00016-4.

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Conference papers on the topic "Signature whistle"

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Deng, Xiaohong, Yi Tao, Xingbin Tu, and Xiaomei Xu. "The separation of overlapped dolphin signature whistle based on blind source separation." In 2017 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC). IEEE, 2017. http://dx.doi.org/10.1109/icspcc.2017.8242534.

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Narayan, Sridhar. "Identification of dolphin signature whistles using artificial neural networks." In AeroSense '97, edited by Steven K. Rogers. SPIE, 1997. http://dx.doi.org/10.1117/12.271492.

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Lyn, Heidi, and Megan Broadway. "Greeting and meeting: Vocal interactions and use of signature whistles in bottlenose dolphins during an introduction." In The Evolution of Language. Proceedings of the 12th International Conference on the Evolution of Language (Evolang12). Wydawnictwo Naukowe Uniwersytetu Mikołaja Kopernika, 2018. http://dx.doi.org/10.12775/3991-1.065.

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