CLICK COMMUNICATION IN HARBOUR PORPOISES<i>PHOCOENA PHOCOENA</i>

Clausen, Karin Tubbert; Wahlberg, Magnus; Beedholm, Kristian; DeRuiter, Stacy L.; Madsen, Peter T.

doi:10.1080/09524622.2011.9753630

Cited by 93 publications

(104 citation statements)

References 44 publications

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“…Such changes were unlikely to result from the presence of seismic noise, as this was mostly below 400 Hz [14], while most energy in porpoise clicks is within 110-150 kHz [26]. Porpoises may use high-repetition click trains for prey capture or for social communication [27]. Thus, observed changes in buzzing occurrence could reflect disruption of either foraging or social activities.…”

Section: Discussionmentioning

confidence: 99%

Variation in harbour porpoise activity in response to seismic survey noise

et al. 2014

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Animals exposed to anthropogenic disturbance make trade-offs between perceived risk and the cost of leaving disturbed areas. Impact assessments tend to focus on overt behavioural responses leading to displacement, but tradeoffs may also impact individual energy budgets through reduced foraging performance. Previous studies found no evidence for broad-scale displacement of harbour porpoises exposed to impulse noise from a 10 day two-dimensional seismic survey. Here, we used an array of passive acoustic loggers coupled with calibrated noise measurements to test whether the seismic survey influenced the activity patterns of porpoises remaining in the area. We showed that the probability of recording a buzz declined by 15% in the ensonified area and was positively related to distance from the source vessel. We also estimated received levels at the hydrophones and characterized the noise response curve. Our results demonstrate how environmental impact assessments can be developed to assess more subtle effects of noise disturbance on activity patterns and foraging efficiency.

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Section: Discussionmentioning

confidence: 99%

Variation in harbour porpoise activity in response to seismic survey noise

et al. 2014

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“…Communicative click sequences at varying pulse repetition rates have been described for several odontocete species (Weilgart and Whitehead, 1993;Blomqvist and Amundin, 2004;Lammers et al, 2006;Aguilar Soto et al, 2011;Clausen et al, 2011;Marrero et al, 2016). Captive bottlenose dolphins emit directional pulsed sounds in intraspecific agonistic interactions (Blomqvist and Amundin, 2004;Blomqvist, 2004).…”

Section: Burst Pulsesmentioning

confidence: 99%

“…They use sound to communicate and echolocate, emitting directional pulses of high-frequency sound and listening for echoes to build an acoustic scene of prey and landmarks using an active echolocation sense (Madsen and Surlykke, 2013). Our understanding of the echolocation behavior of toothed whales is gradually increasing (Miller et al, 2004;Madsen et al, 2005;Wisniewska et al, 2016;Clausen et al, 2011), but is limited by the challenges of studying the acoustic behavior of free-ranging marine animals that often vocalize at depth and out of sight. Many toothed whales have sophisticated communication systems, but study of their vocal behavior is hampered by problems in identifying which animal makes a sound and which animals respond to these calls.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, buzzes are routinely associated with increased maneuvering and/or changes in the body acceleration rate ('jerk') Miller et al, 2004;Aguilar Soto et al, 2011), likely resulting from fast movements in pursuit of prey. Alternatively, short bursts of high-repetition-rate clicks have been proposed to function in communication ; S. Neves, Acoustic behavior of Risso's dolphins, Grampus griseus, in the Canary Islands, Spain, PhD Thesis, University of St Andrews, St Andrews, 2012), agonistic interactions (Miller et al, 1995;Blomqvist and Amundin, 2004;Lammers et al, 2006;Clausen et al, 2011) and long-range detection (Finneran, 2013) in this species as well as in other odontocetes. To date, Grampus buzzes have not been unambiguously defined (Corkeron and Van Parijs, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Discrimination of fast click series produced by tagged Risso's dolphins (Grampus griseus) for echolocation or communication

Arranz

DeRuiter

Stimpert

et al. 2016

Journal of Experimental Biology

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Early studies that categorized odontocete pulsed sounds had few means of discriminating signals used for biosonar-based foraging from those used for communication. This capability to identify the function of sounds is important for understanding and interpreting behavior; it is also essential for monitoring and mitigating potential disturbance from human activities. Archival tags were placed on free-ranging Grampus griseus to quantify and discriminate between pulsed sounds used for echolocation-based foraging and those used for communication. Two types of rapid click-series pulsed sounds, buzzes and burst pulses, were identified as produced by the tagged dolphins and classified using a Gaussian mixture model based on their duration, association with jerk (i.e. rapid change of acceleration) and temporal association with click trains. Buzzes followed regular echolocation clicks and coincided with a strong jerk signal from accelerometers on the tag. They consisted of series averaging 359±210 clicks (mean±s.d.) with an increasing repetition rate and relatively low amplitude. Burst pulses consisted of relatively short click series averaging 45±54 clicks with decreasing repetition rate and longer inter-click interval that were less likely to be associated with regular echolocation and the jerk signal. These results suggest that the longer, relatively lower amplitude, jerkassociated buzzes are used in this species to capture prey, mostly during the bottom phase of foraging dives, as seen in other odontocetes. In contrast, the shorter, isolated burst pulses that are generally emitted by the dolphins while at or near the surface are used outside of a direct, known foraging context.

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“…Passive acoustic monitoring (PAM) techniques involve the detection of cetacean vocalizations from either towed or static hydrophones, and this method is increasingly being used to collect data on cetacean habitat use (e.g., Rayment et al, 2009b;Simon et al, 2010), behaviour (e.g., Leeney et al, 2007;Van Parijs et al, 2009;Akamatsu et al, 2010;Clausen et al, 2010;Kyhn et al, 2010), and even to estimate abundance (e.g., Marques et al, 2009;Whitehead, 2009). Static acoustic monitoring (SAM), using moored equipment to detect cetacean vocalizations from a fixed area, enables the observation of trends in relative abundance and of behaviours of target animals within a focal area (Kimura et al, 2010) and has several advantages over visual techniques.…”

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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CLICK COMMUNICATION IN HARBOUR PORPOISESPHOCOENA PHOCOENA

Cited by 93 publications

References 44 publications

Variation in harbour porpoise activity in response to seismic survey noise

Variation in harbour porpoise activity in response to seismic survey noise

Discrimination of fast click series produced by tagged Risso's dolphins (Grampus griseus) for echolocation or communication

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

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