02236nas a2200253   4500008004100000245017200041210006900213260001600282300001400298490000700312520141300319653002101732653001001753653003201763653001801795653001301813100002101826700002001847700001601867700001501883700002201898700001901920856004301939       2018                        eng d00aDescription and classification of Indian Ocean humpback dolphin ( <i>Sousa plumbea</i>               ) whistles recorded off the Sindhudurg coast of Maharashtra, India0 aDescription and classification of Indian Ocean humpback dolphin   cJan-07-2018  a755 - 7760 v343 a<p>The Indian Ocean humpback dolphin (Sousa plumbea), a common cetacean species in India, has a diverse vocal repertoire, which to date has not been described in detail. This study focused on analyzing their whistle vocalizations. Humpback dolphins were recorded off the Sindhudurg coast of Maharashtra, India, and 2,260 whistles were analyzed for their acoustic characteristics. Whistles spanned a wide frequency range between 2.3 kHz and 33.0 kHz, with durations ranging from 0.01 s to 1.60 s. Whistles were categorized into seven contour classes based on their qualitative prop- erties. A classification and regression tree (CART) analysis was used to quantify vari- ability between the seven contour classes using the measured acoustic features. Based on the CART analysis, frequency gradient, minimum slope, maximum slope, begin- ning and ending slope accounted for most variability between whistle types. CART resulted in an overall classification accuracy of 89.5%. This study provides a detailed description of acoustic features and qualitative properties of humpback dolphin whis- tles from the northwestern coast of India. Further comparisons of acoustic data from Sousa populations along the Indian coast are necessary to determine possible geo- graphic variations in whistle characteristics and whether the variations are driven by environmental or genetic factors or a combination of both.</p>
10ahumpback dolphin10aIndia10apassive acoustic monitoring10aSousa plumbea10awhistles1 aBopardikar, Isha1 aSutaria, Dipani1 aSule, Mihir1 aJog, Ketki1 aPatankar, Vardhan1 aKlinck, Holger  uhttp://doi.wiley.com/10.1111/mms.v34.3