R. Probert, Angie Gullan, Diana Rocha, Sasha Dines, T. Gridley
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引用次数: 0
Abstract
ABSTRACT Individually distinctive signature whistles are used by common bottlenose dolphins (Tursiops truncatus) during social interactions and to facilitate group cohesion. There is evidence from a few populations that Indian Ocean bottlenose dolphins (T. aduncus) also use signature whistles. We investigated this from a coastal resident population of T. aduncus in Mozambique. Video-audio data were collected during recreational swim-with activities over 12 years, where potential signature whistles were identified from 28 individuals. Of the 405 whistles documented, 75% were produced in SIGID bouts. Visual assessment of individual signature whistle contours demonstrated temporal stability for up to 8 years. Overall, most signature whistle types had upsweep frequency modulation and were emitted as multiloop whistles. Comparing all whistle contours to each other indicated low discrimination between individuals, with contours frequently categorised together. However, sex differences in the frequency characteristics of whistles were identified, with females whistling at lower frequencies than males. Our results indicate either a shared whistle repertoire or identity encoding with subtle contour features, requiring acute auditory perception and discrimination to decipher caller identity. More widespread geographic investigation into signature whistle use may demonstrate variation in acoustic communication systems for bottlenose dolphins, which are thus far not well understood.
期刊介绍:
Bioacoustics primarily publishes high-quality original research papers and reviews on sound communication in birds, mammals, amphibians, reptiles, fish, insects and other invertebrates, including the following topics :
-Communication and related behaviour-
Sound production-
Hearing-
Ontogeny and learning-
Bioacoustics in taxonomy and systematics-
Impacts of noise-
Bioacoustics in environmental monitoring-
Identification techniques and applications-
Recording and analysis-
Equipment and techniques-
Ultrasound and infrasound-
Underwater sound-
Bioacoustical sound structures, patterns, variation and repertoires