Visual health assessment of white‐beaked dolphins off the coast of Northumberland, North Sea, using underwater photography

VanBressem, M-F; Burville, Ben; Sharpe, Matt; Berggren, Per; VanWaerebeek, K

doi:10.1111/mms.12501

Cited by 6 publications

(5 citation statements)

References 36 publications

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“…However, the population in the North Sea and the adjacent Atlantic European waters has been proposed as a Priority Species (Grouped Plan for Dolphins) in the UK Biodiversity Action Plan and is protected under the EU's Habitats Directive (92/43/22C), where it is listed in the Annex IV as "in need of strict protection" (Parsons et al, 2010;Calderan et al, 2013). A visual health assessment of white-beaked dolphins off the Northumberland coast, UK, identified high incidence of skin disease and trauma across identified individuals, highlighting a potential conservation concern for the species (Van Bressem et al, 2018).…”

Section: Andmentioning

confidence: 99%

“…This study recorded underwater sounds from free-ranging white-beaked dolphins off the Northumberland coast, UK, where the species are regularly encountered between June and October (Van Bressem et al, 2018). The aims were to investigate spectral-temporal parameter differences across different click types, and to determine whether a high-frequency secondary peak frequency and spectral banding patterns were present in individual clicks.…”

Section: Andmentioning

confidence: 99%

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Characterization and comparison of echolocation clicks of white-beaked dolphins (Lagenorhynchus albirostris) off the Northumberland coast, UK

Yang

Sharpe

Temple

et al. 2021

The Journal of the Acoustical Society of America

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Odontocetes produce ultrasonic clicks for navigation and foraging. These are commonly categorized as regular or buzz clicks based on the inter-click interval. Buzz clicks are linked to foraging behaviors and may be subdivided into slow buzz clicks for prey chase, and regular buzz clicks for prey capture. This study recorded these three click types produced by white-beaked dolphins (Lagenorhynchus albirostris) off the Northumberland coast, UK. Acoustic parameters, (including duration, centroid frequency, and root-mean-squared bandwidth) were calculated and compared across the three click types. The results showed that the regular clicks had shorter durations and higher frequencies than both the buzz click types. The regular buzz clicks had longer durations, lower frequencies, and narrower bandwidths than the slow buzz clicks.Additionally, regardless of click type, about 30% of the clicks had high-frequency secondary peaks and > 90% of the clicks displayed spectral peak and notch patterns between 20 and 80 kHz. These findings are useful for future quantitative assessment of the echolocation a

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Section: Andmentioning

confidence: 99%

Section: Andmentioning

confidence: 99%

Characterization and comparison of echolocation clicks of white-beaked dolphins (Lagenorhynchus albirostris) off the Northumberland coast, UK

Yang

Sharpe

Temple

et al. 2021

The Journal of the Acoustical Society of America

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“…Emaciated animals with calves were considered probable lactating females, which usually have poor body condition as a result of the high energetic requirements of lactation (Miller et al, 2012; Bejarano, Wells & Costa, 2017). The presence of skin disorders has been included in visual health assessments of wild dolphins (Van Bressem et al, 2018), especially tattoo skin disease (poxvirus), which may be associated with immune deficiencies (Van Bressem et al, 2009). This disease may be lethal and negatively affect dolphin populations.…”

Section: Methodsmentioning

confidence: 99%

Abundance and effect of health status on apparent survival of Guiana dolphins, Sotalia guianensis, in an open embayment in north‐eastern Brazil

Meirelles

Choi‐Lima²,

Nova³

et al. 2022

Aquatic Conservation

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1. Guiana dolphins (Sotalia guianensis) inhabit shallow waters of the tropical western Atlantic, an area that is now mostly occupied by cities and harbours. Demographic studies have been concentrated in sheltered areas of south/south-eastern Brazil.2. This study investigated site fidelity and estimated population abundance and apparent survival of Guiana dolphins in Mucuripe Embayment (ME), on the northeastern Brazilian coast, through photo-identification surveys and closed and open population mark-recapture models, from October 2009 to September 2011.3. Forty-six Guiana dolphin groups were recorded (in groups of between one and eight dolphins, with a mean ± SD of 3.49 ± 2.33) in 27 out of 40 surveys. Twentyfive animals were photo-identified, with eight considered to have a 'poor health' status. The standardized site fidelity index (SSFI) was low (0.25).4. Using the program CAPTURE, the time and heterogeneity model (M th ) resulted in a total abundance estimate of 39, with a Coefficient of Variation (CV) of 21% (95% CI 35-80%). In PROGRAM MARK, model averaging resulted in a total abundance estimate of 33 (CV 32%, 95% CI 30-100%). Using a CV of 21%, the power to detect a decline of 50% during the study period was 0.44 and the power to detect a decline of 5% a year was 0.11. To detect these declines with a 0.90 power, 12 years of monitoring would be necessary.5. The annual adult apparent survival rate was low (0.71; CV 19%; 95% CI 0.40-0.90), and differed for dolphins in 'good' (0.64; CV 28%, 95% CI 0.27-0.89) and 'poor' (0.85; CV 22%; 95% CI: 0.23-0.99) health.6. The low abundance of Guiana dolphins in ME indicates that conservation actions should start immediately, such as creating a marine protected area, continuing awareness campaigns, using by-catch reduction technologies, developing new regulations, and promoting law enforcement. Monitoring studies must continue with increased effort to reduce uncertainty in estimates and to improve the power to detect trends of decline.

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“…Collection of the data found in NDD20 was achieved through two separate fieldwork efforts. Below water collection efforts consisted of 36 opportunistic surveys of the Farne Deeps -a glacial trench with high bio-productivity approximately 14-20nm offshore from the village of Seahouses, UK, from 2011-2018 (16). Above water efforts consisted of 27 surveys along a stretch of the Northumberland coast designated as the Coquet to St. Mary's Marine Conservation Zone (MCZ).…”

Section: Data Collectionmentioning

confidence: 99%

NDD20: A large-scale few-shot dolphin dataset for coarse and fine-grained categorisation

Trotter,

Atkinson,

Sharpe

et al. 2020

Preprint

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We introduce the Northumberland Dolphin Dataset 2020 (NDD20), a challenging image dataset annotated for both coarse and fine-grained instance segmentation and categorisation. This dataset, the first release of the NDD ( 13), was created in response to the rapid expansion of computer vision into conservation research and the production of fielddeployable systems suited to extreme environmental conditions -an area with few open source datasets. NDD20 contains a large collection of above and below water images of two different dolphin species for traditional coarse and fine-grained segmentation. All data contained in NDD20 was obtained via manual collection in the North Sea around the Northumberland coastline, UK. We present experimentation using standard deep learning network architecture trained using NDD20 and report baselines results.

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Visual health assessment of white‐beaked dolphins off the coast of Northumberland, North Sea, using underwater photography

Cited by 6 publications

References 36 publications

Characterization and comparison of echolocation clicks of white-beaked dolphins (Lagenorhynchus albirostris) off the Northumberland coast, UK

Characterization and comparison of echolocation clicks of white-beaked dolphins (Lagenorhynchus albirostris) off the Northumberland coast, UK

Abundance and effect of health status on apparent survival of Guiana dolphins, Sotalia guianensis, in an open embayment in north‐eastern Brazil

NDD20: A large-scale few-shot dolphin dataset for coarse and fine-grained categorisation

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