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Acoustic ecology of dolphins of the genus Sotalia (Cetartiodactyla, Delphinidae) and of the newly described Araguaian boto Inia araguaiaensis (Cetartiodactyla, Iniidae)
| Content Provider | Semantic Scholar |
|---|---|
| Author | Santos, Gabriel Alves Dos |
| Copyright Year | 2018 |
| Abstract | The recent discovery of the Araguaian river dolphin (Inia araguaiaensis) highlights how little we know about the diversity and biology of river dolphins. In this study, we described the acoustic repertoire of this newly discovered species in concert with their behaviour in freeranging, human-habituated individuals. We analysed 393 signals that we classified into 13 types of tonal sounds (n=15) and 66 types of pulsed calls (n=378). The most common sounds were short two-component calls. Thirty-five percent (n=140) of these calls were emitted by calves as they reunited with their mothers suggesting a key role in mother-calf communication. Our findings show that the acoustic repertoire of river dolphins is far from simple. Furthermore, the calls described here are similar in acoustic structure to those produced by social delphinids, such as orcas and pilot whales. Uncovering the context in which these signals are produced may help understand the social structure of this species and contribute to our understanding of the evolution of acoustic communication in whales. Introduction River dolphins of the genus Inia commonly known as botos are evolutionary relics found exclusively in the Amazon, Orinoco, and Tocantins River Basins of South America [1-7]. Like the franciscana dolphin (Pontoporia blainvillei), the baiji (Lipotes vexillifer), and the Ganges and Indus river dolphins (Platanista spp.), botos have flexible necks and backbones, a low and largebased dorsal fin, and a slender rostrum [1, 2, 8-16]. Botos have a preference for habitats with slow currents and high prey concentration such as bays, confluences, small streams, and channels and island margins [17-21]. However, residency patterns vary within locations from long-term residency to occasional visitors [17]. Although, botos are traditionally considered solitary, with |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://repositorio.ufpa.br/jspui/bitstream/2011/10478/1/Tese_AcousticEcologyDolphins.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
