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124 results for “bottlenose dolphin”
Vortex input files -- Lacy et al. Assessing the viability of the Sarasota Bay community of bottlenose dolphins
<p>Vortex PVA input files for analyses presented in Lacy et al. "Assessing the viability of the Sarasota Bay community of bottlenose dolphins", Frontiers in Marine Science. </p>
Variation in foraging activity influences area-restricted search behaviour by bottlenose dolphins
<p>Area-restricted search (ARS) behaviour is commonly used to characterise spatio-temporal variation in foraging activity of predators, but evidence of the drivers underlying this behaviour in marine systems is sparse. Advances in underwater sound recording techniques and automated processing of acoustic data now provide opportunities to investigate these questions where species use different vocalisations when encountering prey. Here, we used passive acoustics to investigate drivers of ARS behaviour in a population of dolphins, to determine if residency in key foraging areas increased following encounters with prey. Analyses were based on two independent proxies of foraging: echolocation buzzes (widely used as foraging proxies), and bray calls (vocalizations linked to salmon predation attempts). Echolocation buzzes were extracted from echolocation data loggers and bray calls from broadband recordings by a convolutional neural network (CNN). We found a strong positive relationship between the duration of encounters and the frequency of both foraging proxies, supporting the theory that bottlenose dolphins engage in ARS behaviour in response to higher prey encounter rates. This study provides empirical evidence for one driver of ARS behaviour and demonstrates the potential for applying passive acoustic monitoring in combination with deep learning-based techniques to investigate the behaviour of vocal animals. </p>
Far-field effects of impulsive noise on coastal bottlenose dolphins
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Data from: Non-invasive age estimation based on fecal DNA using methylation-sensitive high-resolution melting for Indo-Pacific bottlenose dolphins
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Variation in foraging activity influences area-restricted search behaviour by bottlenose dolphins
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Data from: Sex bias in mortality risk changes over the lifespan of bottlenose dolphins
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Data from: Juvenile social dynamics reflect adult reproductive strategies in bottlenose dolphins
The juvenile period is a challenging life history stage, especially in species with a high degree of fission-fusion dynamics, such as bottlenose dolphins, where maternal protection is virtually absent. Here, we examined how juvenile male and female bottlenose dolphins navigate this vulnerable period. Specifically, we examined their grouping patterns, activity budget, network dynamics, and social associations in the absence of adults. We found that juveniles live in highly dynamic groups, with group composition changing every 10 minutes on average. Groups were generally segregated by sex, and segregation was driven by same-sex preference rather than opposite-sex avoidance. Juveniles formed strong associations with select individuals, especially kin and same-sex partners, and both sexes formed cliques with their preferred partners. Sex-specific strategies in the juvenile period reflected adult reproductive strategies, in which the exploration of potential social partners may be more important for males (which form long-term alliances in adulthood) than females (which preferentially associate with kin in adulthood). Females spent more time alone and were more focused on foraging than males, but still formed close same-sex associations, especially with kin. Males cast a wider social net than females, with strong same-sex associations and many male associates. Males engaged in more affiliative behavior than females. These results are consistent with the social bonds and skills hypothesis and suggest that delayed sexual maturity in species with relational social complexity may allow individuals to assess potential associates and explore a complex social landscape without the risks associated with sexual maturity (e.g. adult reproductive competition; inbreeding).
Sociality and tattoo skin disease among bottlenose dolphins in Shark Bay, Australia
<p></p><p>Social behavior is an important driver of infection dynamics, though identifying the social interactions that foster infectious disease transmission is challenging. Here we examine how social behavior impacts disease transmission in Indo-Pacific bottlenose dolphins (Tursiops aduncus) using an easily identifiable skin disease and social network data. We analyzed tattoo skin disease (TSD) lesions based on photographs collected as part of a 34-year longitudinal study in relation to the sociality of T. aduncus using three metrics (degree, time spent socializing, and time in groups) and network structure, using the k-test. We show that calves with TSD in the second year of life associated more with TSD-positive individuals in the first year of life compared with calves that did not have TSD. Additionally, the network k-test showed that the social network links are epidemiologically relevant for transmission. However, degree, time spent in groups, and time spent socializing were not significantly different between infected and uninfected groups. Our findings indicate that association with infected individuals is predictive of an individual's risk for TSD and that the social association network can serve as a proxy for studying the epidemiology of skin diseases in bottlenose dolphins.</p><p></p>
Magnetic Resonance Imaging Scan of a Bottlenose Dolphin Brain (Tursiops truncatus)
<p>Magnetic Resonance Imaging Scan of a Bottlenose Dolphin Brain (<em>Tursiops truncatus</em>) from http://braincatalogue.org/Bottlenose_dolphin</p>
Fig. 5 in Abundance And Summer Distribution Of A Local Stock Of Black Sea Bottlenose Dolphins, Tursiops Truncatus (Cetacea, Delphinidae), In Coastal Waters Near Sudak (Ukraine, Crimea)
Fig. 5. Discovery curve as cumulative number of identified dolphins vs. duration of study.
Fig. 3 in Abundance And Summer Distribution Of A Local Stock Of Black Sea Bottlenose Dolphins, Tursiops Truncatus (Cetacea, Delphinidae), In Coastal Waters Near Sudak (Ukraine, Crimea)
Fig. 3. Categories of dorsal fins for photo-identification(a– d, marked; e, f, unmarked).
Fig. 1 in Abundance And Summer Distribution Of A Local Stock Of Black Sea Bottlenose Dolphins, Tursiops Truncatus (Cetacea, Delphinidae), In Coastal Waters Near Sudak (Ukraine, Crimea)
Fig. 1. Area of study in the northern Black Sea.
Table 1 in How long do dolphins live? Survival rates and life expectancies for bottlenose dolphins in zoological facilities ťs. wild populations
<p><i>Table 1.</i> Mean and median life expectancies (in years, with 95% confidence intervals) for bottlenose dolphins in zoological care as calculated by Kaplan-Meier analyses.</p><table><tbody><tr><th>Time period</th><th>Median LE (CI)</th><th>Mean LE (CI)</th></tr></tbody><tbody><tr><th>1974–1982</th><td>9.0 (5.9–11.4)</td><td>10.6 (8.8–12.5)</td></tr><tr><th>1983–1992</th><td>15.3 (12.5–17.1)</td><td>17.3 (15.2–19.4)</td></tr><tr><th>1993–2002</th><td>18.2 (14.1–20.3)</td><td>20.3 (18.0–22.5)</td></tr><tr><th>2003–2012</th><td>29.2 (25.0–32.9)</td><td>28.2 (25.3–31.0)</td></tr></tbody></table>
Data from: Low frequency sampling rates are effective to record bottlenose dolphins
<p>Acoustic monitoring in cetacean studies is an effective but expensive approach. This is partly because of the high sampling rate required by acoustic devices when recording high-frequency echolocation clicks. However, the proportion of recording echolocation clicks at different frequencies is unknown for many species, including bottlenose dolphins. Here, we investigated the echolocation clicks for two subspecies of bottlenose dolphins in the western South Atlantic Ocean. The possibility of record echolocation clicks at 24 and 48 kHz was assessed by two approaches. First, we considered the clicks in the frequency range up to 96 kHz. We found a loss of 0.95-13.90% of echolocation clicks in the frequency range below 24 kHz, and 0.01-0.42% below 48 kHz, to each subspecies. Then, we evaluated these recordings downsampled at 48 and 96 kHz and confirmed that echolocation clicks are recorded at these lower frequencies, with some loss. Therefore, despite reaching high frequencies, the clicks can also be recorded at lower frequencies because echolocation clicks from bottlenose dolphins are broadband. We concluded that ecological studies based on presence-absence data are still effective for bottlenose dolphins when acoustic devices with a limited sampling rate are used.</p>
Data from: Anthropogenic noise impairs cooperation in bottlenose dolphins
<p><span>Understanding the impact of human disturbance on wildlife populations is of societal importance</span><span>, with anthropogenic noise known to impact a range of taxa, including mammals,</span><span> birds</span><span>, fish</span><span>, and invertebrates</span><span>.</span><span> While animals are known to use acoustic and other behavioural mechanisms to compensate for increasing noise at the individual level, our understanding of how noise impacts social animals working together remains limited. Here, we investigated the effect of noise on coordination between two bottlenose dolphins performing a cooperative task. We previously demonstrated that the dolphin dyad can use whistles to coordinate their behaviour, working together with extreme precision</span><span>. By equipping each dolphin with a sound-and-movement recording tag (DTAG-3</span><span>) and exposing them to increasing levels of anthropogenic noise, we show that both dolphins nearly doubled their whistle durations and increased whistle amplitude in response to increasing noise. While these acoustic compensatory mechanisms are the same as those frequently used by wild cetaceans</span><span>, they were insufficient to overcome the effect of noise on behavioural coordination. Indeed, cooperative task success decreased in the presence of noise, dropping from 85% during ambient noise control trials to 62.5% during the highest noise exposure. To our knowledge, this is the first study to demonstrate in any non-human species that noise impairs communication between conspecifics performing a cooperative task. Cooperation facilitates vital functions across many taxa and our findings highlight the need to account for the impact of disturbance on functionally important group tasks in wild animal populations.</span></p>
Data from: Low frequency sampling rates are effective to record bottlenose dolphins
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Data from: Juvenile social dynamics reflect adult reproductive strategies in bottlenose dolphins
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Demographic history and adaptive evolution of Indo-Pacific bottlenose dolphins (Tursiops aduncus) in Western Australia
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Data from: Anthropogenic noise impairs cooperation in bottlenose dolphins
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Demographic information and phthalate metabolite concentrations (µg/L) detected in bottlenose dolphins (Tursiops truncatus) urine sampled from Barataria Bay, LA during 2011-2023 and Sarasota Bay, FL during 2010-2019, 2022-2024
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