Echolocation clicks of free-ranging Chilean dolphins (<i>Cephalorhynchus eutropia</i>)

Götz, Thomas; Antunes, Ricardo; Heinrich, Sonja

doi:10.1121/1.3353078

Cited by 34 publications

(36 citation statements)

References 12 publications

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“…NBHF clicks of Heaviside's dolphins Similar to other Cephalorhynchus species, Heaviside's dolphins produced NBHF clicks and did not produce whistles. NBHF clicks and the lack of whistles are thus distinctive features of the genus Cephalorhynchus (Kyhn et al, 2009;Götz et al, 2010;Tougaard and Kyhn, 2010). In one study, Dawson and Thorpe (1990) analyzed a large sample of recordings made with a single hydrophone, and although they could not be sure of the orientation of the phonating animal toward the hydrophone, the Heaviside's dolphin sounds found in our study are very similar to the single pulses described by Dawson ).…”

Section: Discussionsupporting

confidence: 76%

“…The echolocation clicks of Hector's dolphins (Cephalorhynchus hectori) (Dawson, 1988;Dawson and Thorpe, 1990; , Commerson's dolphins (Cephalorhynchus commersonii) (Kamminga and Wiersma, 1982;Yeh et al, 1982;, Hatakeyama et al, 1988Dziedzic and De Buffrenil, 1989;Nakamura, 1999, and Chilean dolphin (Cephalorhynchus eutropia) (Götz et al, 2010) have been described in detail. Compared to the very short (<50 ls), intense (often >200 dB re 1 lPa) broadband (À3 dB BW >10 of kHz) clicks typical of other delphinids (Au, 1997;2002), NBHF clicks are longer (>125 ls), typically >20 dB less intense signals with one peak above 100 kHz and with narrower BWs (À3 dB BW typically <10 kHz).…”

Section: Introductionmentioning

confidence: 96%

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Echolocation signals of Heaviside’s dolphins (Cephalorhynchus heavisidii)

Morisaka

Karczmarski

Akamatsu

et al. 2011

The Journal of the Acoustical Society of America

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Field recordings of echolocation signals produced by Heaviside's dolphins (Cephalorhynchus heavisidii) were made off the coast of South Africa using a hydrophone array system. The system consisted of three hydrophones and an A-tag (miniature stereo acoustic data-logger). The mean centroid frequency was 125 kHz, with a -3 dB bandwidth of 15 kHz and -10 dB duration of 74 μs. The mean back-calculated apparent source level was 173 dB re 1 μPa(p.-p.). These characteristics are very similar to those found in other Cephalorhynchus species, and such narrow-band high-frequency echolocation clicks appear to be a defining characteristic of the Cephalorhynchus genus. Click bursts with very short inter-click intervals (up to 2 ms) were also recorded, which produced the "cry" sound reported in other Cephalorhynchus species. Since inter-click intervals correlated positively to click duration and negatively to bandwidth, Heaviside's dolphins may adjust their click duration and bandwidth based on detection range. The bimodal distribution of the peak frequency and stable bimodal peaks in spectra of individual click suggest a slight asymmetry in the click production mechanism.

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Section: Discussionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 96%

Echolocation signals of Heaviside’s dolphins (Cephalorhynchus heavisidii)

Morisaka

Karczmarski

Akamatsu

et al. 2011

The Journal of the Acoustical Society of America

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“…The clicks of Heaviside's dolphins conform to the model of species using NBHF clicks (Morisaka & Connor, 2007). Heaviside's dolphin clicks were reported to have a mean centroid frequency of 125 kHz (range 118 to 132 kHz), click duration of 74 μs, inter-click intervals ranging from 2 to 113 ms (Morisaka et al, 2011), and overall characteristics similar to the clicks of other Cephalorhynchus species (Kamminga & Wiersma, 1982;Dawson & Thorpe, 1990;Kyhn et al, 2009Kyhn et al, , 2010Götz et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Using Static Acoustic Monitoring to Describe Echolocation Behaviour of Heaviside’s Dolphins (Cephalorhynchus heavisidii) in Namibia

Leeney¹,

Carslake²,

Elwen³

2011

Aquat Mamm

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Static acoustic monitoring is a cost-effective, low-effort means of gathering large datasets on echolocation click characteristics and habitat use by odontocetes. Heaviside's dolphins (Cephalorhynchus heavisidii) were monitored using an acoustic monitoring unit, the T-POD, in July 2008 at a site of known high abundance for this species in Walvis Bay, Namibia. The T-POD successfully detected clicks from Heaviside's dolphins, and these clicks were detected in the 120 to 140 kHz frequency range. A distinct diel pattern to the hourly mean inter-click interval was observed, with higher values during daylight hours than at night, suggesting that click trains are produced at faster rates at night time. There was no apparent diel pattern in the proportion of buzz trains produced, however. A diel pattern in click activity was observed, with many more detection-positive minutes per hour recorded between dusk and dawn, and vocalization activity dropping to low levels in the middle of the day. This corresponded with visual observations made on abundance of dolphins in the study area. These results suggest that Heaviside's dolphins use this site primarily during the night. Static acoustic monitoring proved to be an effective technique for monitoring patterns of habitat use by Heaviside's dolphins.

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“…A second publication on the topic by Götz et al [28] discussed the observation of multiple pulses within the Chilean dolphin recordings, but attributed these to being off-axis merged waveforms, wherein the second pulse is presumed to be the result of a reflection. The structure of these pulses appears to be non-overlapping.…”

Section: Chilean Dolphin (C Eutropia)mentioning

confidence: 97%

“…In 2005, Götz and Heinrich [25] made recordings of freeranging Chilean dolphins using a two-element vertical array. A second publication on the topic by Götz et al [28] discussed the observation of multiple pulses within the Chilean dolphin recordings, but attributed these to being off-axis merged waveforms, wherein the second pulse is presumed to be the result of a reflection.…”

Section: Chilean Dolphin (C Eutropia)mentioning

confidence: 99%

Review of the occurrence of multiple pulse echolocation clicks in recordings from small odontocetes

Finfer

White

Chua

et al. 2012

IET Radar, Sonar &Amp; Navigation

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This study investigates the extent of the possible correlation between small odontocetes that predominantly inhabit littoral waters, and those which have been associated with the detection of echolocation clicks that consist of multiple pulses. The echolocation clicks discussed are primarily characterised as short, high frequency (.100 kHz) and narrow band. There are many sources that report clicks that contain multiple pulses and there is more than one structure associated with such pulses. A review of the literature provides a list of odontocetes which have been associated with such sounds and the structure of those reported clicks. The competing hypotheses regarding the origins of such multiple pulses in recordings are discussed. Regardless of the mechanism by which multiple pulse clicks occur, there are potential competitive advantages which may arise from them, and these are highlighted.

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Echolocation clicks of free-ranging Chilean dolphins (Cephalorhynchus eutropia)

Cited by 34 publications

References 12 publications

Echolocation signals of Heaviside’s dolphins (Cephalorhynchus heavisidii)

Echolocation signals of Heaviside’s dolphins (Cephalorhynchus heavisidii)

Using Static Acoustic Monitoring to Describe Echolocation Behaviour of Heaviside’s Dolphins (Cephalorhynchus heavisidii) in Namibia

Review of the occurrence of multiple pulse echolocation clicks in recordings from small odontocetes

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