7 found an upward shift in several frequency parameters during non-resting behaviours. Whistle production is generally highest whilst dolphins are socialising 6, with whistle characteristics also varying according to group activity state 7– 11. However, although our understanding of whistle function is developing, the reasons behind variations in these sounds remain poorly understood.ĭolphin whistles can be described using a number of acoustic characteristics that appear to vary with context, such as frequency components and duration. Functions of dolphin whistles include group cohesion 1, coordination of group activities and movements 2, 3, identification of food patches 4, and individual identification 5. Whistles have received considerable research attention as a result of the role they play in social communication and because they can be easily characterised by their frequency contours. Delphinids produce a variety of sounds, which typically fall into three types: brief echolocation clicks, broad-band burst-pulse sounds, and frequency-modulated whistles. Digital files of individual whistles and corresponding measurements make this dataset available to researchers to address future questions regarding variations within and between dolphin communities.Īnimal communication sounds are diverse and dynamic. Of these, 164 ‘high-quality’ whistles were manually measured to provide an additional five acoustic characteristics.
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Acoustic data review identified 336 whistles, which were subsequently measured for six key characteristics using Raven Pro software. Data were collected using an autonomous recorder and analysed using a range of acoustic measurements.
This Data Descriptor presents an acoustic dataset of bottlenose dolphin ( Tursiops aduncus) whistles recorded in the Fremantle Inner Harbour, Western Australia. However, logistical and economic constraints on dolphin research have resulted in data collection biases, inconsistent analytical approaches, and knowledge gaps. Therefore, comparison of whistle characteristics can be used to address numerous research questions regarding dolphin populations and behaviour. Whistles vary in their characteristics according to context, such as activity state, group size, group composition, geographic location, and ambient noise levels.
Dolphins use frequency-modulated whistles for a variety of social functions.
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