Whistle characteristics of the spinner dolphin population in the Comoros Archipelago

Bonato, Marco; Papale, Elena; Pingitore, Giuseppe; Ricca, S.; Attoumane, Artadji; Ouledi, A.; Giacoma, Cristina

doi:10.1121/1.4935518

Cited by 14 publications

(7 citation statements)

References 28 publications

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“…These variations can also be influenced by species‐specific differences in repertoire or environmental factors within the local habitat (May‐Collado and Wartzok ; Bonato et al . ).…”

Section: Discussionmentioning

confidence: 97%

Description and classification of Indian Ocean humpback dolphin (Sousa plumbea) whistles recorded off the Sindhudurg coast of Maharashtra, India

Bopardikar¹,

Sutaria

Sule³

et al. 2018

Marine Mammal Science

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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 properties. A classification and regression tree (CART) analysis was used to quantify variability between the seven contour classes using the measured acoustic features. Based on the CART analysis, frequency gradient, minimum slope, maximum slope, beginning 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 whistles from the northwestern coast of India. Further comparisons of acoustic data from Sousa populations along the Indian coast are necessary to determine possible geographic variations in whistle characteristics and whether the variations are driven by environmental or genetic factors or a combination of both.

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“…These variations can also be influenced by species‐specific differences in repertoire or environmental factors within the local habitat (May‐Collado and Wartzok ; Bonato et al . ).…”

Section: Discussionmentioning

confidence: 97%

Description and classification of Indian Ocean humpback dolphin (Sousa plumbea) whistles recorded off the Sindhudurg coast of Maharashtra, India

Bopardikar¹,

Sutaria

Sule³

et al. 2018

Marine Mammal Science

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“…There are no published sound recordings from Australia. Their sounds have instead been document from Hawaii [230,[256][257][258][259][260][261][262], the Eastern Tropical Pacific [151,152], the northwestern Atlantic [174], Brazil [263][264][265] and the western Indian Ocean off Madagascar [266].…”

Section: Stenella Longirostris-long-snouted Spinner Dolphinmentioning

confidence: 99%

Review of Underwater and In-Air Sounds Emitted by Australian and Antarctic Marine Mammals

et al. 2017

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The study of marine soundscapes is a growing field of research. Recording hardware is becoming more accessible; there are a number of off-the-shelf autonomous recorders that can be deployed for months at a time; software analysis tools exist as shareware; raw or preprocessed recordings are freely and publicly available. However, what is missing are catalogues of commonly recorded sounds. Sounds related to geophysical events (e.g. earthquakes) and weather (e.g. wind and precipitation), to human activities (e.g. ships) and to marine animals (e.g. crustaceans, fish and marine mammals) commonly occur. Marine mammals are distributed throughout Australia's oceans and significantly contribute to the underwater soundscape. However, due to a lack of concurrent visual and passive acoustic observations, it is often not known which species produces which sounds. To aid in the analysis of Australian and Antarctic marine soundscape recordings, a literature review of the sounds made by marine mammals was undertaken. Frequency, duration and source level measurements are summarised and tabulated. In addition to the literature review, new marine mammal data are presented and include recordings from Australia of Omura's whales (Balaenoptera omurai), dwarf sperm whales (Kogia sima), common dolphins (Delphinus delphis), short-finned pilot whales (Globicephala macrorhynchus), long-finned pilot whales (G. melas), Fraser's dolphins (Lagenodelphis hosei), false killer whales (Pseudorca crassidens), striped dolphins (Stenella coeruleoalba) and spinner dolphins (S. longirostris), as well as the whistles and burst-pulse sounds of Australian pygmy killer whales (Feresa attenuata). To date, this is the most comprehensive acoustic summary for marine mammal species in Australian waters.

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“…Therefore, frequency parameters may be distinctive in local populations and reflect certain habitat characteristics in each area (Bonato et al . ). This phenomenon was first proposed by Morton () as the “Acoustic Adaptation Hypothesis (AAH),” which predicts that habitat presents selective forces favoring the evolution of some sound aspects over others.…”

Section: Discussionmentioning

confidence: 97%

“…Bonato et al . () showed that the frequency parameters of spinner dolphin S. longirostris whistles were related only to habitat‐dependent variables (wind/sea conditions and depth) in the Comoros Archipelago, suggesting that this is the result of environmental selection on acoustic signals in this species. Louzada () emphasizes that the large behavioral repertoire of Guiana dolphins is the result of evolutionary processes driven by environmental heterogeneity.…”

Section: Discussionmentioning

confidence: 99%

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Whistle variability of Guiana dolphins in South America: Latitudinal variation or acoustic adaptation?

Moron

Lopes

Reis

et al. 2018

Marine Mammal Science

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A previous comparison of whistles using data sampled at 48 kHz suggested that certain frequency parameters vary along a latitudinal gradient. This geographical pattern may be biased because whistles sampled at higher frequencies could potentially have very different frequency contents. The current study compared the acoustic parameters of Guiana dolphin (Sotalia guianensis) whistles recorded at a higher sampling rate (96 kHz) and from groups occupying two never before sampled sites, Benevente Bay, Espírito Santo, Brazil, and Formosa Bay, Rio Grande do Norte, Brazil, with recordings of other populations in South America. By only considering data sampled at a rate of at least 96 kHz, we aimed to detect differences in whistles across locations. Contrary to previous findings, our analyses do not indicate any clear separation between northern and southern populations based on whistles, and do not corroborate the hypothesis of latitudinal acoustic variation in this species. The variation in Guiana dolphin whistle parameters found here appears to be influenced by latitude to some extent, but several other factors, including sampling method, environmental fluctuations, and social influence on vocal learning, may be confounding the detection of a geographic pattern in these whistle samples.

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Whistle characteristics of the spinner dolphin population in the Comoros Archipelago

Cited by 14 publications

References 28 publications

Description and classification of Indian Ocean humpback dolphin (Sousa plumbea) whistles recorded off the Sindhudurg coast of Maharashtra, India

Description and classification of Indian Ocean humpback dolphin (Sousa plumbea) whistles recorded off the Sindhudurg coast of Maharashtra, India

Review of Underwater and In-Air Sounds Emitted by Australian and Antarctic Marine Mammals

Whistle variability of Guiana dolphins in South America: Latitudinal variation or acoustic adaptation?

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