Brays and bits: information theory applied to acoustic communication sequences of bottlenose dolphins

Luís, Ana Rita; Alves, I. S.; Sobreira, F. V.; Couchinho, Miguel Nogueira; Santos, Manuel Eduardo dos

doi:10.1080/09524622.2018.1443285

Cited by 11 publications

(27 citation statements)

References 45 publications

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“…Burst-pulsed signals are short, discrete bursts of broadband sound pulses believed to function mainly in social interactions 56 , although some signals may also play a role in foraging events, such as bray calls 27,29 . Bray calls consist of a singleor multi-unit sequences of sounds with burst-pulsed signals alternating with short tonal sweeps, only recorded for bottlenose dolphins [57][58][59] . Whistles are continuous, narrow band, frequency modulated signals that range in duration from several tenths of a second to several seconds.…”

Section: Discussionmentioning

confidence: 99%

Temporal patterns in acoustic presence and foraging activity of oceanic dolphins at seamounts in the Azores

Cascão

Lammers

Prieto

et al. 2020

Sci Rep

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Several seamounts have been identified as hotspots of marine life in the Azores, acting as feeding stations for top predators, including cetaceans. Passive acoustic monitoring is an efficient tool to study temporal variations in the occurrence and behaviour of vocalizing cetacean species. We deployed bottom-moored Ecological Acoustic Recorders (EARs) to investigate the temporal patterns in acoustic presence and foraging activity of oceanic dolphins at two seamounts (Condor and Gigante) in the Azores. Data were collected in March–May 2008 and April 2010–February 2011. Dolphins were present year round and nearly every day at both seamounts. Foraging signals (buzzes and bray calls) were recorded in >87% of the days dolphin were present. There was a strong diel pattern in dolphin acoustic occurrence and behaviour, with higher detections of foraging and echolocation vocalizations during the night and of social signals during daylight hours. Acoustic data demonstrate that small dolphins consistently use Condor and Gigante seamounts to forage at night. These results suggest that these seamounts likely are important feeding areas for dolphins. This study contributes to a better understanding of the feeding ecology of oceanic dolphins and provides new insights into the role of seamount habitats for top predators.

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Section: Discussionmentioning

confidence: 99%

Temporal patterns in acoustic presence and foraging activity of oceanic dolphins at seamounts in the Azores

Cascão

Lammers

Prieto

et al. 2020

Sci Rep

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“…However, this may have largely been an artefact of the rarity of certain types as the two patterns for which we identified lone units were relatively common (Table I). To our knowledge, there are only two examples of ordered sequences in odontocetes: the "N7-N8" calls of Northern resident killer whales and the bray sequences of bottlenose dolphins (Ford, 1988, Lu ıs et al, 2018. Structurally similar combinations of vocalizations are found more commonly in other taxa, where they have been linked to communicative complexity.…”

Section: Discussionmentioning

confidence: 99%

“…A lack of overlap between repeated signals is often used to support inferences that a sequence is produced by a single individual (Lu ıs et al, 2018;Sayigh et al, 2013;Zwamborn and Whitehead, 2017). However, some species produce call exchanges with precise and stereotyped timing (Mann et al, 2006;Pika et al, 2018), meaning that nonoverlapping sequences can also result from exchanges between multiple individuals (Miller et al, 2004).…”

Section: Discriminating Between Sequences and Call Exchangesmentioning

confidence: 99%

“…Even when individual units do not have specific meanings, the "developmental stress hypothesis" states that the complexity of a sequence (e.g., birdsong) can serve as an otherwise arbitrary indicator of mate quality (Nowicki and Searcy, 2004). Thus, without attention to the sequential structure of signals, the complexity and functions of vocal repertoires may be underestimated (Collier et al, 2014;Kershenbaum et al, 2012;Lu ıs et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…are known to produce feeding-associated bray sequences composed of repeated pulsed units, as well as "multi-looped" sequences of signature whistles (Janik, 2000;Lu ıs et al, 2018;Esch et al, 2009). Finally, sperm whales (Physester macrocephalus) are known to produce temporally stereotyped click codas (Watkins and Schevill, 1977).…”

Section: Introductionmentioning

confidence: 99%

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Vocal sequences in narwhals (Monodon monoceros)

Walmsley

Rendell

Hussey

et al. 2020

The Journal of the Acoustical Society of America

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Sequences are indicative of signal complexity in vocal communication. While vocal sequences are well-described in birds and terrestrial mammals, the extent to which marine mammals use them is less well understood. This study documents the first known examples of sequence use in the narwhal (Monodon monoceros), a gregarious Arctic cetacean. Eight female narwhals were fitted with animal-borne recording devices, resulting in one of the largest datasets of narwhal acoustic behaviour to date. A combination of visual and quantitative classification procedures was used to test whether subjectively defined vocalization patterns were organized into sequences. Next, acoustic characteristics were analyzed to assess whether sequences could disclose group or individual identity. Finally, generalized linear models was used to investigate the behavioural context under which sequences were produced. Two types of sequences, consisting of "paired" patterns and "burst pulse series," were identified. Sequences of burst pulse series were typically produced in periods of high vocal activity, whereas the opposite was true for sequences of paired patterns, suggesting different functions for each. These findings extend the set of odontocetes which are known to use vocal sequences. Inquiry into vocal sequences in other understudied marine mammals may provide further insights into the evolution of vocal communication. V

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Study of repertoire use reveals unexpected context-dependent vocalizations in bottlenose dolphins (Tursiops truncatus)

Gallo,

De Moura Lima,

Böye

et al. 2023

Sci Nat

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Brays and bits: information theory applied to acoustic communication sequences of bottlenose dolphins

Cited by 11 publications

References 45 publications

Temporal patterns in acoustic presence and foraging activity of oceanic dolphins at seamounts in the Azores

Temporal patterns in acoustic presence and foraging activity of oceanic dolphins at seamounts in the Azores

Vocal sequences in narwhals (Monodon monoceros)

Study of repertoire use reveals unexpected context-dependent vocalizations in bottlenose dolphins (Tursiops truncatus)

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