The spatial context of free-ranging Hawaiian spinner dolphins (<b><i>Stenella longirostris</i></b>) producing acoustic signals

Lammers, Marc O.; Schotten, Michiel; Au, Whitlow W. L.

doi:10.1121/1.2151804

Cited by 77 publications

(55 citation statements)

References 28 publications

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“…We know very little about how wild dolphins use echolocation to solve tasks such as avoiding obstacles or detecting, selecting, and capturing prey ͑Tyack, 1999͒. Relatively recent field observations using arrays ͑e.g., Lammers et al, 2006͒ and acoustic recording tags ͑e.g., Madsen et al, 2005͒ are beginning to change this. However, concurrent observations of underwater behavior and acoustics of dolphins and prey behavior remain limited.…”

Section: Discussionmentioning

confidence: 99%

Phonation behavior of cooperatively foraging spinner dolphins

Benoit‐Bird

2009

The Journal of the Acoustical Society of America

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Groups of spinner dolphins have been shown to cooperatively herd small prey. It was hypothesized that the strong group coordination is maintained by acoustic communication, specifically by frequency-modulated whistles. Observations of groups of spinner dolphins foraging at night within a sound-scattering layer were made with a multibeam echosounder while the rates of dolphin sounds were measured using four hydrophones at 6 m depth intervals. Whistles were only detected when dolphins were not foraging and when animals were surfacing. Differences in click rates were found between depths and between different foraging stages but were relatively low when observations indicated that dolphins were actively feeding despite the consistency of these clicks with echolocation signals. Highest click rates occurred within the scattering layer, during transitions between foraging states. This suggests that clicks may be used directly or indirectly to cue group movement during foraging, potentially by detecting other individuals' positions in the group or serving a direct communicative role which would be contrary to the existing assumption that echolocation and communication are compartmentalized. Communicating via clicks would be beneficial as the signal's characteristics minimize the chance of eavesdropping by competing dolphins and large fish. Our results are unable to support the established paradigm for dolphin acoustic communication and suggest an alternate coordination mechanism in foraging spinner dolphins.

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Section: Discussionmentioning

confidence: 99%

Phonation behavior of cooperatively foraging spinner dolphins

Benoit‐Bird

2009

The Journal of the Acoustical Society of America

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“…There are no published sound recordings from Australia. Their sounds have instead been document from Hawaii [230,[256][257][258][259][260][261][262], the Eastern Tropical Pacific [151,152], the northwestern Atlantic [174], Brazil [263][264][265] and the western Indian Ocean off Madagascar [266].…”

Section: Stenella Longirostris-long-snouted Spinner Dolphinmentioning

confidence: 99%

Review of Underwater and In-Air Sounds Emitted by Australian and Antarctic Marine Mammals

et al. 2017

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The study of marine soundscapes is a growing field of research. Recording hardware is becoming more accessible; there are a number of off-the-shelf autonomous recorders that can be deployed for months at a time; software analysis tools exist as shareware; raw or preprocessed recordings are freely and publicly available. However, what is missing are catalogues of commonly recorded sounds. Sounds related to geophysical events (e.g. earthquakes) and weather (e.g. wind and precipitation), to human activities (e.g. ships) and to marine animals (e.g. crustaceans, fish and marine mammals) commonly occur. Marine mammals are distributed throughout Australia's oceans and significantly contribute to the underwater soundscape. However, due to a lack of concurrent visual and passive acoustic observations, it is often not known which species produces which sounds. To aid in the analysis of Australian and Antarctic marine soundscape recordings, a literature review of the sounds made by marine mammals was undertaken. Frequency, duration and source level measurements are summarised and tabulated. In addition to the literature review, new marine mammal data are presented and include recordings from Australia of Omura's whales (Balaenoptera omurai), dwarf sperm whales (Kogia sima), common dolphins (Delphinus delphis), short-finned pilot whales (Globicephala macrorhynchus), long-finned pilot whales (G. melas), Fraser's dolphins (Lagenodelphis hosei), false killer whales (Pseudorca crassidens), striped dolphins (Stenella coeruleoalba) and spinner dolphins (S. longirostris), as well as the whistles and burst-pulse sounds of Australian pygmy killer whales (Feresa attenuata). To date, this is the most comprehensive acoustic summary for marine mammal species in Australian waters.

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“…BP sounds are directional signals (Branstetter et al 2012) and may be used over short ranges and during interactions in which 'emotively charged' information is shared between conspecifics or perhaps to support visual displays (Lammers et al 2006). They are commonly associated with social contexts and, in particular, have been linked to aggressive behaviour in captive (Overstrom 1983;Blomqvist and Amundin 2004) and free-ranging (Herzing 2000) bottlenose dolphins.…”

Section: Discussionmentioning

confidence: 99%

The acoustic repertoire of wild common bottlenose dolphins (Tursiops truncatus) in Walvis Bay, Namibia

et al. 2015

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Describing the repertoire of sounds produced by wild cetaceans is necessary for understanding their function, for acoustic population monitoring and for measuring the potential influence of anthropogenic impact. Geographic variation in the types and parameters of sounds makes regional assessment of vocal behaviour necessary. We describe the acoustic repertoire of a small population of common bottlenose dolphins (Tursiops truncatus) inhabiting Walvis Bay, Namibia from recordings made over 59 encounters (72 h) between 2009 and 2012. The characteristics of burst pulse (BP) sounds, low-frequency narrow-band (LFN) sounds, brays, whistles and chirps are described. The BP sounds identified were generated at 150-1050 pulses per second, and most were short, lasting less than 1 s in duration. Bottlenose dolphins from Walvis Bay produce the lowest frequency LFN sounds described for the species. Whistles ranged in frequency from 1.58 to 23.24 kHz, and the mean acoustic parameters were within the range of those described from other geographic regions. Chirps were identified infrequently and usually as single occurrences. Although several sound types were often produced in close temporal succession, we found little evidence of stereotyped bray production, even during recordings of animals feeding. Our results demonstrate geographic variation in both the characteristics and sound types used by bottlenose dolphins and highlight the importance of regional data collection as a pre-curser to passive acoustic monitoring programmes.

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The spatial context of free-ranging Hawaiian spinner dolphins (Stenella longirostris) producing acoustic signals

Cited by 77 publications

References 28 publications

Phonation behavior of cooperatively foraging spinner dolphins

Phonation behavior of cooperatively foraging spinner dolphins

Review of Underwater and In-Air Sounds Emitted by Australian and Antarctic Marine Mammals

The acoustic repertoire of wild common bottlenose dolphins (Tursiops truncatus) in Walvis Bay, Namibia

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