Echolocation Characteristics and Range Detection Threshold of a False Killer Whale (Pseudorca Crassidens)

Thomas, Jeànette A.; Turl, Charles W.

doi:10.1007/978-1-4899-0858-2_21

Cited by 54 publications

(56 citation statements)

References 14 publications

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“…The inter-pulse interval of odontocetes is linearly correlated with target range (Thomas and Turl, 1990;Au, 1993). We calculated the average interpulse interval in all click trains for both species (Figs.…”

Section: Resultsmentioning

confidence: 99%

“…Behavioural data, such as dive depth and times, and potential target distance, can be obtained by using acoustic tags supplemented with additional data acquisition devices. For some captive odontocetes there is a linear correlation between inter-pulse interval and target range as shown by the bottlenose dolphin, Tursiops truncatus (Au, 1993), false killer whale, Pseudorca crassidens (Thomas and Turl, 1990), and the harbor porpoise (Verfuss et al, 2005). The inter-pulse interval is longer than the two-way sound travel time to and back from the target (Morozov et al, 1972).…”

Section: Article In Pressmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of echolocation behaviour between coastal and riverine porpoises

Akamatsu

Teilmann²,

Miller

et al. 2007

Deep Sea Research Part II: Topical Studies in Oceanography

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Section: Resultsmentioning

confidence: 99%

Section: Article In Pressmentioning

confidence: 99%

Comparison of echolocation behaviour between coastal and riverine porpoises

Akamatsu

Teilmann²,

Miller

et al. 2007

Deep Sea Research Part II: Topical Studies in Oceanography

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“…Au et al 1995, Madsen et al 2004, Ibsen et al 2011 and false killer whale echolocation capabilities have mainly been studied with captive animals (e.g. Thomas & Turl 1990, Brill et al 1992, Yuen et al 2005, Kloepper et al 2012, Madsen et al 2013). The overall spectral content of their clicks seems to be generally lower than what is known for most other echolocating delphinids, having considerable energy below 20 kHz.…”

Section: Introductionmentioning

confidence: 99%

False killer whale and short-finned pilot whale acoustic identification

Baumann‐Pickering¹,

Simonis²,

Oleson³

et al. 2015

Endang. Species. Res.

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(Jefferson et al. 2008), where long-line fishing is conducted. The behavior, ecology, and social structure of these species have been studied most extensively around the Hawaiian archipelago (Baird 2009 ABSTRACT: False killer whales Pseudorca crassidens and short-finned pilot whales Globicephala macrorhynchus are known to interact with long-line fishing gear in Hawaiian waters, causing economic loss and leading to whale injuries and deaths. The main Hawaiian Islands' insular population of false killer whales is listed as endangered and the offshore population is considered 'strategic' under the Marine Mammal Protection Act due to relatively high bycatch levels. Discriminating between these species acoustically is problematic due to similarity in the spectral content of their echolocation clicks. We used passive acoustic monitoring along with data from satellite tags to distinguish signals from these 2 species. Acoustic encounters recorded with autonomous instruments offshore of the islands of Hawai'i and Kaua'i were matched with concurrent and nearby location information obtained from satellite tagged individuals. Two patterns of echolocation clicks were established for the 2 species. The overall spectral click parameters were highly similar (22 kHz peak and 25 kHz center frequency), but false killer whales had shorter duration and broader bandwidth clicks than short-finned pilot whales (225 µs, 8 kHz [−3 dB bandwidth] and 545 µs, 4 kHz, respectively). Also, short-finned pilot whale clicks showed distinct spectral peaks at 12 and 18 kHz. Automated classification techniques using Gaussian mixture models had a 6.5% median error rate. Based on these findings for echolocation clicks and prior published work on whistle classification, acoustic encounters of false killer whales and short-finned pilot whales on autonomous instruments should be identifiable to species level, leading to better long-term monitoring with the goal of mitigating bycatch.

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“…The number of ultrasonic pulses emitted is considered an appropriate indicator of the search effort made by an animal. Moreover, the target range of the sonar used by dolphins can be estimated from the interclick interval [1,6]. These signals can easily be recorded and can provide information about the timing and the distance over which the echolocating animal uses its biosonar.…”

Section: Introductionmentioning

confidence: 99%

Bilateral bioacoustics research of Chinese freshwater dolphins

Akamatsu

Wang

2009

Acoust. Sci. & Tech.

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China has various ecologically important sites that provide wonderful research opportunities. The biosonar behavior of Yangtze finless porpoises (Neophocaena phocaenoides asiaeorientalis) in the semi-natural reserve, Hubei, China has been extensively studied for the past five years by the Japan Fisheries Research Agency and Institute of Hydrobiology, Chinese Academy of Sciences. Careful scanning and acoustical autofocusing behavior in porpoises was firstly observed in free-ranging conditions. The biosonar model obtained in this study allowed us to recently develop a broadband high-resolution sonar system called the Dolphin Sonar Simulator. Frequent biosonar production by finless porpoises also allowed an effective passive acoustical survey to be conducted of the animal along the entire habitat of this species in 2006. Bilateral collaboration with cutting-edge acoustical technologies was proven to be highly productive for basic behavioral science, engineering applications, and the conservation of endangered species.

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Echolocation Characteristics and Range Detection Threshold of a False Killer Whale (Pseudorca Crassidens)

Cited by 54 publications

References 14 publications

Comparison of echolocation behaviour between coastal and riverine porpoises

Comparison of echolocation behaviour between coastal and riverine porpoises

False killer whale and short-finned pilot whale acoustic identification

Bilateral bioacoustics research of Chinese freshwater dolphins

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