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dc.contributor.authorJensen, Frants
dc.contributor.authorRocco, Alice
dc.contributor.authorMansur, Rubaiyat
dc.contributor.authorSmith, Brian
dc.contributor.authorJanik, Vincent M.
dc.contributor.authorMadsen, Peter
dc.date.accessioned2013-11-04T11:01:04Z
dc.date.available2013-11-04T11:01:04Z
dc.date.issued2013-04-03
dc.identifier.citationJensen , F , Rocco , A , Mansur , R , Smith , B , Janik , V M & Madsen , P 2013 , ' Clicking in Shallow Rivers : Short-Range Echolocation of Irrawaddy and Ganges River Dolphins in a Shallow, Acoustically Complex Habitat ' PLoS One , vol. 8 , no. 4 , e59284 . DOI: 10.1371/journal.pone.0059284en
dc.identifier.issn1932-6203
dc.identifier.otherPURE: 49660047
dc.identifier.otherPURE UUID: 69d9faec-593c-4907-94c9-f7272ec9d80a
dc.identifier.otherScopus: 84875720310
dc.identifier.urihttp://hdl.handle.net/10023/4141
dc.description.abstractToothed whales (Cetacea, odontoceti) use biosonar to navigate their environment and to find and catch prey. All studied toothed whale species have evolved highly directional, high-amplitude ultrasonic clicks suited for long-range echolocation of prey in open water. Little is known about the biosonar signals of toothed whale species inhabiting freshwater habitats such as endangered river dolphins. To address the evolutionary pressures shaping the echolocation signal parameters of non-marine toothed whales, we investigated the biosonar source parameters of Ganges river dolphins (Platanista gangetica gangetica) and Irrawaddy dolphins (Orcaella brevirostris) within the river systems of the Sundarban mangrove forest. Both Ganges and Irrawaddy dolphins produced echolocation clicks with a high repetition rate and low source level compared to marine species. Irrawaddy dolphins, inhabiting coastal and riverine habitats, produced a mean source level of 195 dB (max 203 dB) re 1 µPapp whereas Ganges river dolphins, living exclusively upriver, produced a mean source level of 184 dB (max 191) re 1 µPapp. These source levels are 1–2 orders of magnitude lower than those of similar sized marine delphinids and may reflect an adaptation to a shallow, acoustically complex freshwater habitat with high reverberation and acoustic clutter. The centroid frequency of Ganges river dolphin clicks are an octave lower than predicted from scaling, but with an estimated beamwidth comparable to that of porpoises. The unique bony maxillary crests found in the Platanista forehead may help achieve a higher directionality than expected using clicks nearly an octave lower than similar sized odontocetes.en
dc.format.extent13en
dc.language.isoeng
dc.relation.ispartofPLoS Oneen
dc.rights© 2013 Jensen et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.en
dc.subjectUltrasonic clicksen
dc.subjectBiosonar signalsen
dc.subjectEcholocationen
dc.subjectGanges river dolphinsen
dc.subjectIrrawaddy dolphinsen
dc.subjectAdaptationen
dc.subjectQ Scienceen
dc.subject.lccQen
dc.titleClicking in Shallow Rivers : Short-Range Echolocation of Irrawaddy and Ganges River Dolphins in a Shallow, Acoustically Complex Habitaten
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Biologyen
dc.contributor.institutionUniversity of St Andrews. Sea Mammal Research Uniten
dc.contributor.institutionUniversity of St Andrews. Marine Alliance for Science & Technology Scotlanden
dc.contributor.institutionUniversity of St Andrews. Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews. Institute of Behavioural and Neural Sciencesen
dc.contributor.institutionUniversity of St Andrews. Centre for Social Learning & Cognitive Evolutionen
dc.contributor.institutionUniversity of St Andrews. Bioacoustics groupen
dc.identifier.doihttps://doi.org/10.1371/journal.pone.0059284
dc.description.statusPeer revieweden


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