Species information in whistle frequency modulation patterns of common dolphins
| Autor: | Oswald, Julie N., Walmsley, Sam F., Casey, Caroline, Fregosi, Selene, Southall, Brandon, Janik, Vincent M. |
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| Přispěvatelé: | University of St Andrews. Scottish Oceans Institute, University of St Andrews. School of Biology, University of St Andrews. Sea Mammal Research Unit, University of St Andrews. Marine Alliance for Science & Technology Scotland, University of St Andrews. Institute of Behavioural and Neural Sciences, University of St Andrews. Centre for Social Learning & Cognitive Evolution, University of St Andrews. Bioacoustics group |
| Rok vydání: | 2021 |
| Předmět: |
Common dolphin
Computer science Common Dolphins QH301 Biology Speech recognition Delphinus delphis Communications system California Vocal learning General Biochemistry Genetics and Molecular Biology QH301 species recognition Delphinus bairdii biology.animal Animals Learning Research Articles QL Pacific Ocean biology vocal learning Species recognition Recognition Psychology DAS Articles QL Zoology biology.organism_classification whistles Vocalization Animal General Agricultural and Biological Sciences common dolphin Whistles Frequency modulation |
| Zdroj: | Philosophical Transactions of the Royal Society B: Biological Sciences |
| ISSN: | 1471-2970 0962-8436 |
| DOI: | 10.1098/rstb.2021.0046 |
| Popis: | The most flexible communication systems are those of open-ended vocal learners that can acquire new signals throughout their lifetimes. While acoustic signals carry information in general voice features that affect all of an individual's vocalizations, vocal learners can also introduce novel call types to their repertoires. Delphinids are known for using such learned call types in individual recognition, but their role in other contexts is less clear. We investigated the whistles of two closely related, sympatric common dolphin species, Delphinus delphis and Delphinus bairdii , to evaluate species differences in whistle contours. Acoustic recordings of single-species groups were obtained from the Southern California Bight. We used an unsupervised neural network to categorize whistles and compared the resulting whistle types between species. Of the whistle types recorded in more than one encounter, 169 were shared between species and 60 were species-specific (32 D. delphis types, 28 D. bairdii types). Delphinus delphis used 15 whistle types with an oscillatory frequency contour while only one such type was found in D. bairdii . Given the role of vocal learning in delphinid vocalizations, we argue that these differences in whistle production are probably culturally driven and could help facilitate species recognition between Delphinus species. This article is part of the theme issue ‘Vocal learning in animals and humans’. |
| Databáze: | OpenAIRE |
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