Whistle Stability and Variation in Captive Bottlenose Dolphins (Tursiops truncatus) Recorded in Isolation and Social Contexts

Rachinas-Lopes, Patrícia; Luís, Ana Rita; Borges, Augusta; Neto, Márcia; Santos, Manuel Eduardo dos

doi:10.1578/am.43.1.2017.1

Cited by 6 publications

(3 citation statements)

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“…The relative stability and dominance of the SW repertoire of a bottlenose dolphin have provided researchers an accessible way to understand the communication and the cognitive mechanisms of this mammal group (Janik et al, 2013). However, the available information on SWs is almost exclusively derived from captive or inshore/coastal bottlenose dolphin populations (Harley, 2008; Heiler et al, 2016; Jones et al, 2020b; King & Janik, 2013; Kriesell et al, 2014; Longden et al, 2020; Luís et al, 2016; Papale et al, 2015; Rachinas‐Lopes et al, 2017; Sayigh et al, 2017; Terranova et al, 2021). Information about the SWs of oceanic populations of common bottlenose dolphins is still limited and little is known about the ecology of these populations (Silva et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

First report of signature whistles in an oceanic common bottlenose dolphin (Tursiops truncatus) population from Revillagigedo Archipelago, Mexico

Rio

Rosales‐Nanduca

Piuma³

et al. 2022

Marine Mammal Science

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This study is the first baseline acoustic description of common bottlenose dolphin populations (Tursiops truncatus) from Revillagigedo Archipelago and the first identification of signature whistles (SWs) in an oceanic population of T. truncatus. A total of 85% (199/233) of the recorded whistles were classified as stereotyped whistles and subsequently (bout analysis/SIGID) categorized into one of five SW types. External observers were in perfect agreement in classifying whistles into the adopted SW categorization.SWs represented 42% (98/233) of the repertoire. Overall, most whistle types were categorized as sine (80%; SW1, SW2, SW4, and SW5) with one downsweep (20%, SW3).Roca Partida Island had the highest number of SW types.Principal component analysis explained 77% of the total SWs variance, highlighting the importance of shape/contour variables to the SWs variance. The combined mean SWs acoustic parameters from Revillagigedo Archipelago were higher than that recorded in coastal regions, which may indicate there are differences between SWs of pelagic and coastal populations. However, further acoustic and ecological studies in the Archipelago are needed to clarify and expand our findings, to identify its members (Photo ID and

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Section: Introductionmentioning

confidence: 99%

First report of signature whistles in an oceanic common bottlenose dolphin (Tursiops truncatus) population from Revillagigedo Archipelago, Mexico

Rio

Rosales‐Nanduca

Piuma³

et al. 2022

Marine Mammal Science

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“…Social changes are likely to impact odontocete sound production [ 43 ]. Captive bottlenose dolphins have been shown to whistle 7.8 times more in isolation than when they were not separated from their congeners [ 71 ], and social separation has been reported to affect some whistle types but not others in this species [ 43 ]. Yangtze finless porpoises produced more clicks when they were separated in subgroups.…”

Section: Discussionmentioning

confidence: 99%

The Click Production of Captive Yangtze Finless Porpoises (Neophocaena asiaeorientalis asiaorientalis) Is Influenced by Social and Environmental Factors

Serres

Hao

et al. 2021

Animals

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Yangtze finless porpoises use high-frequency clicks to navigate, forage, and communicate. The way in which click production may vary depending on social or environmental context has never been investigated. A group of five captive Yangtze finless porpoises was monitored for one year, and 107 h of audio recordings was collected under different conditions. Using a MATLAB-generated interface, we extracted click density (i.e., number of clicks per minute) from these recordings and analyzed its variation depending on the context. As expected, click density increased as the number of animals present increased. The click density did not exhibit diurnal variations but did have seasonal variations, with click density being highest in summer and fall. Yangtze finless porpoises produced more clicks when socially separated than when not (136% more), during training/feeding sessions than outside of such sessions (312% more), when enrichment was provided (265% more on average), and when noisy events occurred rather than when no unusual event occurred (22% more). The click density decreased when many visitors were present in the facility (up to 35% less). These results show that Yangtze finless porpoises modulate their click production depending on the context and suggest that their echolocation activity and their emotional state may be linked to these changes. Such context-dependent variations also indicate the potential usefulness of monitoring acoustical activity as part of a welfare assessment tool in this species. Additionally, the click density variation found in captivity could be useful for understanding click rate variations of wild populations that are hardly visible.

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“…Among the most studied are narrowband and frequencymodulated tonal sounds called whistles, that can be classified into signature and non-signature whistles based on their function and pattern of emission (Caldwell et al, 1990;Janik and Sayigh, 2013). Signature whistles are stereotypic sounds that encode information about individual identity and, thus, are used as contact calls (Caldwell et al, 1990), whereas non-signature whistles are non-stereotypic sounds produced in a wide range of social contexts (Sayigh et al, 1990;Macfarlane et al, 2017;2017Rachinas-Lopes et al, 2017. However, most studies of the impact of anthropogenic noise on dolphin whistles do not take into account whistle function, and limit descriptions to overall changes in frequency, contour complexity, and temporal characteristics (Morisaka et al, 2005a;May-Collado & Wartzok 2008;Perez-Ortega et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Dolphin communication during widespread systematic noise reduction-a natural experiment amid COVID-19 lockdowns

Gagne

Perez-Ortega

Hendry

et al. 2022

Front. Remote Sens.

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Underwater noise from human activities is recognized as a world-wide problem, with important repercussions on the acoustic communication of aquatic mammals. During the COVID-19 pandemic, the government of Panama went into a nationwide lockdown to limit the spread of the virus. This lockdown resulted in the closing of tourism infrastructure and limited mobility in both land and coastal areas. We used this “natural experiment” as an opportunity to study the impact of tour-boat activities on dolphin communication by using passive acoustic monitoring data collected before and during the lockdown at Dolphin Bay, Bocas del Toro, Panama. During the lockdown, tour-boat activity was absent, but boats transporting people and supplies were allowed to circulate. The shift in type of boat activity within the lockdown resulted in lower ambient noise levels and more frequent detections of dolphin sounds. We also detected a more diverse whistle repertoire during the lockdown than in the pre-lockdown period, even when accounting for variation in sample coverage. A Random Forest Analysis classified whistles between the two periods with high accuracy (92.4% accuracy, κ = 0.85) based primarily on whistle modulation and duration. During the lockdown, whistles were longer in duration and less modulated than pre-lockdown. Our study shows that a shift in boat traffic activity can generate significant changes in dolphin habitat, and in their communicative signals, an important consideration given ongoing unregulated ecotourism in the region.

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Whistle Stability and Variation in Captive Bottlenose Dolphins (Tursiops truncatus) Recorded in Isolation and Social Contexts

Cited by 6 publications

References 0 publications

First report of signature whistles in an oceanic common bottlenose dolphin (Tursiops truncatus) population from Revillagigedo Archipelago, Mexico

First report of signature whistles in an oceanic common bottlenose dolphin (Tursiops truncatus) population from Revillagigedo Archipelago, Mexico

The Click Production of Captive Yangtze Finless Porpoises (Neophocaena asiaeorientalis asiaorientalis) Is Influenced by Social and Environmental Factors

Dolphin communication during widespread systematic noise reduction-a natural experiment amid COVID-19 lockdowns

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