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Journal articles on the topic 'Signature whistle'

Author: Grafiati

Published: 25 June 2021

Last updated: 13 February 2022

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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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11

Janik, Vincent M., and Laela S. Sayigh. "Communication in bottlenose dolphins: 50 years of signature whistle research." Journal of Comparative Physiology A 199, no. 6 (2013): 479–89. http://dx.doi.org/10.1007/s00359-013-0817-7.

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12

Cook, Mandy L. H., Laela S. Sayigh, James E. Blum, and Randall S. Wells. "Signature–whistle production in undisturbed free–ranging bottlenose dolphins ( Tursiops truncatus )." Proceedings of the Royal Society of London. Series B: Biological Sciences 271, no. 1543 (2004): 1043–49. http://dx.doi.org/10.1098/rspb.2003.2610.

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13

King, Stephanie L., Heidi E. Harley, and Vincent M. Janik. "The role of signature whistle matching in bottlenose dolphins, Tursiops truncatus." Animal Behaviour 96 (October 2014): 79–86. http://dx.doi.org/10.1016/j.anbehav.2014.07.019.

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14

King, Stephanie L., Emily Guarino, Katy Donegan, Jane Hecksher, and Kelly Jaakkola. "Further insights into postpartum signature whistle use in bottlenose dolphins (Tursiops truncatus)." Marine Mammal Science 32, no. 4 (2016): 1458–69. http://dx.doi.org/10.1111/mms.12317.

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15

Parijs, Sofie M., and Peter J. Corkeron. "EVIDENCE FOR SIGNATURE WHISTLE PRODUCTION BY A PACIFIC HUMPBACK DOLPHIN, SOUSA CHINENSIS." Marine Mammal Science 17, no. 4 (2001): 944–49. http://dx.doi.org/10.1111/j.1748-7692.2001.tb01308.x.

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16

Hiley, Helen M., Sarah Perry, Steve Hartley, and Stephanie L. King. "What’s occurring? Ultrasonic signature whistle use in Welsh bottlenose dolphins (Tursiops truncatus)." Bioacoustics 26, no. 1 (2016): 25–35. http://dx.doi.org/10.1080/09524622.2016.1174885.

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17

McCowan, Brenda, and Diana Reiss. "Quantitative Comparison of Whistle Repertoires from Captive Adult Bottlenose Dolphins (Delphinidae, Tursiops truncatus): a Re-evaluation of the Signature Whistle Hypothesis." Ethology 100, no. 3 (2010): 194–209. http://dx.doi.org/10.1111/j.1439-0310.1995.tb00325.x.

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18

Sayigh, Laela S., Peter L. Tyack, Randall S. Wells, Michael D. Scott, and A. Blair Irvine. "Sex difference in signature whistle production of free-ranging bottlenose dolphins, Tursiops truncates." Behavioral Ecology and Sociobiology 36, no. 3 (1995): 171–77. http://dx.doi.org/10.1007/bf00177793.

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19

Watwood, Stephanie L., Edward C. G. Owen, Peter L. Tyack, and Randall S. Wells. "Signature whistle use by temporarily restrained and free-swimming bottlenose dolphins, Tursiops truncatus." Animal Behaviour 69, no. 6 (2005): 1373–86. http://dx.doi.org/10.1016/j.anbehav.2004.08.019.

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20

Sayigh, L. S., Peter L. Tyack, Randall S. Wells, Michael D. Scott, and A. Blair Irvine. "Sex difference in signature whistle production of free-ranging bottlenose dolphins, Tursiops truncatus." Behavioral Ecology and Sociobiology 36, no. 3 (1995): 171–77. http://dx.doi.org/10.1007/s002650050137.

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21

Harley, Heidi E. "Whistle discrimination and categorization by the Atlantic bottlenose dolphin (Tursiops truncatus): A review of the signature whistle framework and a perceptual test." Behavioural Processes 77, no. 2 (2008): 243–68. http://dx.doi.org/10.1016/j.beproc.2007.11.002.

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22

King, Stephanie L., Emily Guarino, Loriel Keaton, Linda Erb, and Kelly Jaakkola. "Maternal signature whistle use aids mother-calf reunions in a bottlenose dolphin, Tursiops truncatus." Behavioural Processes 126 (May 2016): 64–70. http://dx.doi.org/10.1016/j.beproc.2016.03.005.

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23

Bebus, Sara, and Denise Herzing. "Mother-Offspring Signature Whistle Similarity and Patterns of Association in Atlantic Spotted Dolphins (Stenella frontalis)." Animal Behavior and Cognition 2, no. 1 (2015): 71–87. http://dx.doi.org/10.12966/abc.02.06.2015.

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24

Jones, Brittany L., Risa Daniels, Samantha Tufano, and Sam Ridgway. "Five members of a mixed-sex group of bottlenose dolphins share a stereotyped whistle contour in addition to maintaining their individually distinctive signature whistles." PLOS ONE 15, no. 5 (2020): e0233658. http://dx.doi.org/10.1371/journal.pone.0233658.

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25

Jagarlamudi, V. K., T. Dudok de Wit, C. Froment, et al. "Whistler wave occurrence and the interaction with strahl electrons during the first encounter of Parker Solar Probe." Astronomy & Astrophysics 650 (June 2021): A9. http://dx.doi.org/10.1051/0004-6361/202039808.

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Aims. We studied the properties and occurrence of narrowband whistler waves and their interaction with strahl electrons observed between 0.17 and 0.26 au during the first encounter of Parker Solar Probe. Methods. We used Digital Fields Board band-pass filtered (BPF) data from FIELDS to detect the signatures of whistler waves. Additionally parameters derived from the particle distribution functions measured by the Solar Wind Electrons Alphas and Protons (SWEAP) instrument suite were used to investigate the plasma properties, and FIELDS suite measurements were used to investigate the electromagnetic (EM) fields properties corresponding to the observed whistler signatures. Results. We observe that the occurrence of whistler waves is low, nearly ~1.5% and less than 0.5% in the analyzed peak and average BPF data, respectively. Whistlers occur highly intermittently and 80% of the whistlers appear continuously for less than 3 s. The spacecraft frequencies of the analyzed waves are less than 0.2 electron cyclotron frequency (fce). The occurrence rate of whistler waves was found to be anticorrelated with the solar wind bulk velocity. The study of the duration of the whistler intervals revealed an anticorrelation between the duration and the solar wind velocity, as well as between the duration and the normalized amplitude of magnetic field variations. The pitch-angle widths (PAWs) of the field-aligned electron population referred to as the strahl are broader by at least 12 degrees during the presence of large amplitude narrowband whistler waves. This observation points toward an EM wave electron interaction, resulting in pitch-angle scattering. PAWs of strahl electrons corresponding to the short duration whistlers are higher compared to the long duration whistlers, indicating short duration whistlers scatter the strahl electrons better than the long duration ones. Parallel cuts through the strahl electron velocity distribution function (VDF) observed during the whistler intervals appear to depart from the Maxwellian shape typically found in the near-Sun strahl VDFs. The relative decrease in the parallel electron temperature and the increase in PAW for the electrons in the strahl energy range suggests that the interaction with whistler waves results in a transfer of electron momentum from the parallel to the perpendicular direction.

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26

Zuber, Krzysztof W., and Krzysztof J. Opieliński. "A Genetics-Based Method for Analysing and Synthesizing Animal Vocal Communication and its Application to Bottlenose Dolphins' Signature Whistle Analysis and Generation." Acta Acustica united with Acustica 104, no. 4 (2018): 657–67. http://dx.doi.org/10.3813/aaa.919205.

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27

Jacobson, A. R., R. H. Holzworth, R. F. Pfaff, and M. P. McCarthy. "Study of oblique whistlers in the low-latitude ionosphere, jointly with the C/NOFS satellite and the World-Wide Lightning Location Network." Annales Geophysicae 29, no. 5 (2011): 851–63. http://dx.doi.org/10.5194/angeo-29-851-2011.

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Abstract. We use the C/NOFS satellite's Vector Electric Field Instrument (VEFI) to study the relationship of impulsive electron whistlers in the low-latitude ionosphere to lightning strokes located by the World-Wide Lightning Location Network (WWLLN). In order to systematize this work, we develop an automated algorithm for recognizing and selecting the signatures of electron whistlers amongst many Very Low Frequency (VLF) recordings provided by VEFI. We demonstrate the application of this whistler-detection algorithm to data mining of a ~ two-year archive of VEFI recordings. It is shown that the relatively simple oblique electron whistler adequately accounts of the great majority of low-latitude oscillatory VLF waves seen in this study.

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28

Sauer, K., and R. D. Sydora. "Beam-excited whistler waves at oblique propagation with relation to STEREO radiation belt observations." Annales Geophysicae 28, no. 6 (2010): 1317–25. http://dx.doi.org/10.5194/angeo-28-1317-2010.

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Abstract. Isotropic electron beams are considered to explain the excitation of whistler waves which have been observed by the STEREO satellite in the Earth's radiation belt. Aside from their large amplitudes (~240 mV/m), another main signature is the strongly inclined propagation direction relative to the ambient magnetic field. Electron temperature anisotropy with Te⊥>Te||, which preferentially generates parallel propagating whistler waves, can be excluded as a free energy source. The instability arises due to the interaction of the Doppler-shifted cyclotron mode ω=−Ωe+kVbcosθ with the whistler mode in the wave number range of kc/ωe≤1 (θ is the propagation angle with respect to the background magnetic field direction, ωe is the electron plasma frequency and Ωe the electron cyclotron frequency). Fluid and kinetic dispersion analysis have been used to calculate the growth rate of the beam-excited whistlers including the most important parameter dependencies. One is the beam velocity (Vb) which, for instability, has to be larger than about 2VAe, where VAe is the electron Alfvén speed. With increasing VAe the propagation angle (θ) of the fastest growing whistler waves shifts from θ~20° for Vb=2VAe to θ~80° for Vb=5VAe. The growth rate is reduced by finite electron temperatures and disappears if the electron plasma beta (βe) exceeds βe~0.2. In addition, Gendrin modes (kc/ωe≈1) are analyzed to determine the conditions under which stationary nonlinear waves (whistler oscillitons) can exist. The corresponding spatial wave profiles are calculated using the full nonlinear fluid approach. The results are compared with the STEREO satellite observations.

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29

Błęcki, J., M. Parrot, and R. Wronowski. "ELF and VLF signatures of sprites registered onboard the low altitude satellite DEMETER." Annales Geophysicae 27, no. 6 (2009): 2599–605. http://dx.doi.org/10.5194/angeo-27-2599-2009.

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Abstract. We report the observation of ELF and VLF signature of sprites recorded on the low altitude satellite DEMETER during thunderstorm activity. At an altitude of ~700 km, waves observed on the E-field spectrograms at mid-to-low latitudes during night time are mainly dominated by up-going 0+ whistlers. During the night of 20 July 2007 two sprites have been observed around 20:10:08 UT from the observatory located on the top of the mountain Śnieżka in Poland (50°44'09" N, 15°44'21" E, 1603 m) and, ELF and VLF data have been recorded by the satellite at about 1200 km from the region of thunderstorm activity. During this event, the DEMETER instruments were switched in the burst mode and it was possible to register the wave forms. It is shown that the two sprites have been triggered by two intense +CG lightning strokes (100 kA) occurring during the same millisecond but not at the same location. Despite the distance DEMETER has recorded at the same time intense and unusual ELF and VLF emissions. It is shown that the whistler wave propagates from the thunderstorm regions in the Earth-ionosphere guide and enters in the ionosphere below the satellite. They last several tens of milliseconds and the intensity of the ELF waveform is close to 1 mV/m. A particularly intense proton whistler is also associated with these emissions.

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30

Esch, H. Carter, Laela S. Sayigh, and Randall S. Wells. "Quantifying parameters of bottlenose dolphin signature whistles." Marine Mammal Science 25, no. 4 (2009): 976–86. http://dx.doi.org/10.1111/j.1748-7692.2009.00289.x.

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31

Fripp, Deborah, Caryn Owen, Ester Quintana-Rizzo, et al. "Bottlenose dolphin (Tursiops truncatus) calves appear to model their signature whistles on the signature whistles of community members." Animal Cognition 8, no. 1 (2004): 17–26. http://dx.doi.org/10.1007/s10071-004-0225-z.

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32

Morgenbesser, Hugh B., John Buck, and Peter Tyack. "Analysis, modification, and synthesis of dolphin signature whistles." Journal of the Acoustical Society of America 95, no. 5 (1994): 2887. http://dx.doi.org/10.1121/1.409356.

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33

Quick, Nicola J., and Vincent M. Janik. "Bottlenose dolphins exchange signature whistles when meeting at sea." Proceedings of the Royal Society B: Biological Sciences 279, no. 1738 (2012): 2539–45. http://dx.doi.org/10.1098/rspb.2011.2537.

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34

Sayigh, Laela S., H. Carter Esch, Randall S. Wells, and Vincent M. Janik. "Facts about signature whistles of bottlenose dolphins, Tursiops truncatus." Animal Behaviour 74, no. 6 (2007): 1631–42. http://dx.doi.org/10.1016/j.anbehav.2007.02.018.

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35

King, Stephanie L., Laela S. Sayigh, Randall S. Wells, Wendi Fellner, and Vincent M. Janik. "Vocal copying of individually distinctive signature whistles in bottlenose dolphins." Proceedings of the Royal Society B: Biological Sciences 280, no. 1757 (2013): 20130053. http://dx.doi.org/10.1098/rspb.2013.0053.

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36

Buck, John R., and Peter L. Tyack. "A quantitative measure of similarity for tursiops truncatus signature whistles." Journal of the Acoustical Society of America 94, no. 5 (1993): 2497–506. http://dx.doi.org/10.1121/1.407385.

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37

Nakahara, Fumio, and Nobuyuki Miyazaki. "Vocal exchanges of signature whistles in bottlenose dolphins (Tursiops truncatus)." Journal of Ethology 29, no. 2 (2011): 309–20. http://dx.doi.org/10.1007/s10164-010-0259-4.

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38

Johnson, M. P., U. S. Inan, and D. S. Lauben. "Subionospheric VLF signatures of oblique (nonducted) whistler-induced precipitation." Geophysical Research Letters 26, no. 23 (1999): 3569–72. http://dx.doi.org/10.1029/1999gl010706.

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39

Macfarlane, Nicholas, Vincent Janik, Frants H. Jensen, et al. "Signature whistles facilitate reunions and/or advertise identity in Bottlenose Dolphins." Journal of the Acoustical Society of America 141, no. 5 (2017): 3543. http://dx.doi.org/10.1121/1.4987492.

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40

Papale, Elena, Gaspare Buffa, Francesco Filiciotto, et al. "Biphonic calls as signature whistles in a free-ranging bottlenose dolphin." Bioacoustics 24, no. 3 (2015): 223–31. http://dx.doi.org/10.1080/09524622.2015.1041158.

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41

McCowan, Brenda, and Diana Reiss. "The fallacy of ‘signature whistles’ in bottlenose dolphins: a comparative perspective of ‘signature information’ in animal vocalizations." Animal Behaviour 62, no. 6 (2001): 1151–62. http://dx.doi.org/10.1006/anbe.2001.1846.

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42

JANIK, VINCENT M., and PETER J. B. SLATER. "Context-specific use suggests that bottlenose dolphin signature whistles are cohesion calls." Animal Behaviour 56, no. 4 (1998): 829–38. http://dx.doi.org/10.1006/anbe.1998.0881.

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43

TYACK, PETER L. "DEVELOPMENT AND SOCIAL FUNCTIONS OF SIGNATURE WHISTLES IN BOTTLENOSE DOLPHINS TURSIOPS TRUNCATUS." Bioacoustics 8, no. 1-2 (1997): 21–46. http://dx.doi.org/10.1080/09524622.1997.9753352.

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44

Luís, Ana Rita, Miguel N. Couchinho, and Manuel E. dos Santos. "Signature whistles in wild bottlenose dolphins: long-term stability and emission rates." acta ethologica 19, no. 2 (2015): 113–22. http://dx.doi.org/10.1007/s10211-015-0230-z.

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45

Bespalov, P. A., V. V. Zaitsev, and A. V. Stepanov. "Energetic Particles in a Flare Loop: Spectra and Radiation Signatures." Symposium - International Astronomical Union 142 (1990): 421–27. http://dx.doi.org/10.1017/s0074180900088343.

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It has been shown that high energy particle spectra, particle dynamics, and radiation in a flare loop are determined by wave-particle interactions. The electron-whistler interaction occurs under conditions of strong pitch angle diffusion that makes the particle distribution function isotropic. The flare loop electrons retain information about the particle source spectrum. The interaction of energetic ions with Alfven waves is characterized by strong, moderate, and weak diffusion. The time delays in hard X-ray and gamma-ray emission during one-step acceleration processes might be understood in terms of a trap-plus-turbulent propagation model. The density of precipitating particles is less than or equal to the trapping one. Radiation signatures of flare loop electrons are discussed.

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46

Gridley, Tess, Victor G. Cockcroft, Elizabeth R. Hawkins, Michelle Lemon Blewitt, Tadamichi Morisaka, and Vincent M. Janik. "Signature whistles in free-ranging populations of Indo-Pacific bottlenose dolphins,Tursiops aduncus." Marine Mammal Science 30, no. 2 (2013): 512–27. http://dx.doi.org/10.1111/mms.12054.

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47

Lima, Alice, and Yvonnick Le Pendu. "Evidence for signature whistles in Guiana dolphins (Sotalia guianensis) in Ilhéus, northeastern Brazil." Journal of the Acoustical Society of America 136, no. 6 (2014): 3178–85. http://dx.doi.org/10.1121/1.4900829.

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Janik, Vincent M., Stephanie L. King, Laela S. Sayigh, and Randall S. Wells. "Identifying signature whistles from recordings of groups of unrestrained bottlenose dolphins (Tursiops truncatus)." Marine Mammal Science 29, no. 1 (2012): 109–22. http://dx.doi.org/10.1111/j.1748-7692.2011.00549.x.

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Cheng, Zhaolong, Ding Wang, Haiping Wu, et al. "Stereotyped Whistles May Be First Evidence to Suggest the Possibility of Signature Whistles in an InjuredIndo-Pacific Humpback Dolphin (Sousa chinensis." Aquatic Mammals 43, no. 2 (2017): 185–92. http://dx.doi.org/10.1578/am.43.2.2017.185.

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Bolton, S. J., R. M. Thorne, D. A. Gurnett, W. S. Kurth, and D. J. Williams. "Enhanced whistler-mode emissions: Signatures of interchange motion in the Io torus." Geophysical Research Letters 24, no. 17 (1997): 2123–26. http://dx.doi.org/10.1029/97gl02020.

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