Relevant bibliographies by topics / Signature whistle

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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"

1

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 (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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2

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 (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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3

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 (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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4

Tyack, Peter. "Whistle repertoires of two bottlenosed dolphins, Tursiops truncatus: mimicry of signature whistles?" Behavioral Ecology and Sociobiology 18, no. 4 (1986): 251–57. http://dx.doi.org/10.1007/bf00300001.

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5

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

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6

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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7

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 (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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8

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 (2006): 8293–97. http://dx.doi.org/10.1073/pnas.0509918103.

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9

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

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10

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

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