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  • 2015-2019  (6)
  • Komparatistik. Außereuropäische Sprachen/Literaturen  (6)
  • 1
    Online-Ressource
    Online-Ressource
    High-frequency whistles of Guiana dolphins ( Sotalia guianensis ) in Guanabara Bay, southeastern Brazil
    Acoustical Society of America (ASA) ; 2015
    In:  The Journal of the Acoustical Society of America Vol. 137, No. 1 ( 2015-01-01), p. EL15-EL19
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 137, No. 1 ( 2015-01-01), p. EL15-EL19
    Kurzfassung: Guiana dolphins produce whistles with a higher frequency and less complexity than most other delphinid species. The present study used a recording system with sampling rate of 192 kHz to describe the high-frequency whistles of Sotalia guianensis in Guanabara Bay, Rio de Janeiro. Eleven acoustic parameters (start, end, minimum, maximum, delta, center and peak frequency, duration, and frequency at 14, 12, and 34 of duration) were measured for all whistles. Whistles with a fundamental frequency up to 66.7 kHz were reported, thereby expanding the known frequency range of this species.
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4902428
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 2015
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    Whistle comparison of four delphinid species in Southeastern Brazil
    Acoustical Society of America (ASA) ; 2016
    In:  The Journal of the Acoustical Society of America Vol. 139, No. 5 ( 2016-05-01), p. EL124-EL127
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 139, No. 5 ( 2016-05-01), p. EL124-EL127
    Kurzfassung: The present study evaluates variations in frequency and duration parameters of whistles of four dolphin species (Sotalia guianensis, Steno bredanensis, Stenella frontalis, and Tursiops truncatus), recorded in the Rio de Janeiro State Coast, Southeastern Brazil. A total of 487 whistles were analyzed. Acoustic parameters of the whistles were classified to species by discriminant function analysis. Overall classification score was 72.5%, with the highest classification score obtained for whistles of S. bredanensis and the lowest obtained for S. frontalis. Most differences were among S. bredanensis and S. guianensis, species that did not have their repertoires compared in other studies.
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4947310
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 2016
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    Monitoring noise levels and delphinid presence through autonomous acoustic in Rio de Janeiro coastal area
    Acoustical Society of America (ASA) ; 2018
    In:  The Journal of the Acoustical Society of America Vol. 144, No. 3_Supplement ( 2018-09-01), p. 1885-1885
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 144, No. 3_Supplement ( 2018-09-01), p. 1885-1885
    Kurzfassung: In order to investigate the soundscape in a Rio de Janeiro coast site, passive acoustic monitoring was conducted during two non-consecutive weeks in the summer of 2015/2016 by deploying one SM2M + device. The equipment recorded at a 66% duty cycle with sample rate of 96 kHz and 36 dB gain. Third octave levels (TOLs) were calculated for all recordings through PAMGuide software. To search for delphinid presence, a band limited energy detector was employed using Raven 1.5 in a 512 Hann window, 50% overlap. TOLs varied across frequencies and day hours. Light hours were noisier than dark hours in 25 frequency bands (MW, p & lt;0.01), with highest mean level being measured at 794 Hz at 06am (105.4 ± 5.4 dB re 1μPa), and lowest mean level measured at 39.8 kHz at 01am (80.3 ± 3.7 dB re 1μPa). A total of 281 delphinid sound emissions were detected in nine occasions, seven during week 1 and two during week 2. Seven detection events occurred during dark hours. Although more than one species of delphinid is known to occur in Rio de Janeiro coast, these results indicate a frequent nocturnal use of the area, which was only possible to observe through autonomous monitoring.
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.5068264
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 2018
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 4
    Online-Ressource
    Online-Ressource
    Burst pulses of Guiana dolphin ( Sotalia guianensis ) in southeastern Brazil
    Acoustical Society of America (ASA) ; 2017
    In:  The Journal of the Acoustical Society of America Vol. 141, No. 4 ( 2017-04-01), p. 2947-2956
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 141, No. 4 ( 2017-04-01), p. 2947-2956
    Kurzfassung: Acoustic studies of Guiana dolphin have been focused on whistles, with little known about pulse signals in this species. This study characterized the temporal and spectral properties of Guiana dolphin burst pulses. Groups of 2 to 23 Guiana dolphins were recorded while feeding and socializing in shallow waters in Guanabara Bay, southeastern Brazil, in 2013 and 2014. Burst pulse analysis involved two steps: signal detection and acoustic parameter analysis. Eight variables were analyzed for 197 total burst pulses: number of clicks, burst pulse duration, interclick interval, click duration, peak frequency, center frequency, −3 dB bandwidth, and −10 dB bandwidth. Mean burst pulse duration was 108.6 ms [standard deviation (SD) = 91.3] with a mean of 168 clicks (SD = 137.3). Burst pulses had short interclick interval (0.7 ms, SD = 0.3) and mean click duration of 300 μs (SD = 100). Mean peak frequency and center frequency were 28 kHz (SD = 11.6) and 29 kHz (SD = 11.0), respectively. Mean −3 dB bandwidth was 15 kHz (SD = 7.5) and mean −10 dB bandwidth was 40.5 kHz (SD = 14.3). The quantitative characterization of Guiana dolphin burst pulses is an important step in describing the full acoustic repertoire of this species.
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4981768
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 2017
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 5
    Online-Ressource
    Online-Ressource
    High-frequency social communication in Sotalia guianensis
    Acoustical Society of America (ASA) ; 2019
    In:  The Journal of the Acoustical Society of America Vol. 146, No. 2 ( 2019-08-01), p. EL124-EL128
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 146, No. 2 ( 2019-08-01), p. EL124-EL128
    Kurzfassung: This study aimed to investigate the use of high ultrasonic frequencies (above 40 kHz) in the Sotalia guianensis whistle repertoire. The whistles were classified as high-frequency (HF) whistles and very high-frequency (VHF) whistles. Seven parameters were extracted and a general linear mixed effects model was performed between the total number of whistles and VHF ones. Frequency parameters of HF and VHF whistles were the highest reported for this species so far. However, VHF whistles were rare and occurred in situations of high acoustic activity, which may represent a strategy used by dolphins to deal with higher levels of vocalization rates.
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.5120550
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 2019
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 6
    Online-Ressource
    Online-Ressource
    Characteristics of Guiana dolphins ( Sotalia guianensis ) burst-pulse sounds emitted during different surface activity rates in Rio de Janeiro’s coast
    Acoustical Society of America (ASA) ; 2018
    In:  The Journal of the Acoustical Society of America Vol. 144, No. 3_Supplement ( 2018-09-01), p. 1978-1978
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 144, No. 3_Supplement ( 2018-09-01), p. 1978-1978
    Kurzfassung: Burst-pulses are still the least studied signals in delphinid acoustic repertoire. In this study, acoustic data were gathered in two Rio de Janeiro coastal bays where groups of Guiana dolphins can be found regularly. The acoustic equipment consisted of a C54XRS hydrophone (-155.8 dBV, 0.006 Hz a 203 kHz) and a Fostex digital recorder (192 kHz sampling rate). During each recording, the surface activity rate of the group was classified as being high or low. Burst-pulses were analyzed using SoundRuler software. Fifty signals were randomly selected and the values for duration (low = 143.9 ± 145.4; high = 82.2 ± 74.8), interpulse interval (low = 2.81 ± 1.92; high = 1.34 ± 1.35), number of pulses (low = 52.6 ± 55.7; high = 71.6 ± 64.5), peak frequency (low = 37.4 ± 2.5; high = 38.5 ± 3.2), and minimum frequency (low = 15.4 ± 6.5; high = 6.7 ± 5.3) were measured. Additionally, a Mann-Whitney U test compared all acoustic parameters of burst-pulses emitted during both surface activity rates. Significant differences between activity rates were found for interpulse interval (p & lt;0.01) and minimum frequency (p & lt;0.01). This scenario could indicate that some burst-pulse parameters are related to group arousal and behavior.
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.5068636
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 2018
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
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