Anthropogenic Noise and Guiana Dolphins (Sotalia guianensis) in Brazil: Ecological and Conservation Concerns

Pais, Fábio de Sousa; Cardoso, Rafaela Prado; Rossi‐Santos, Marcos R.; Wedekin, Leonardo L.; Silva, Flávio J. L.; Monteiro‐Filho, Emygdio L. A.; Leão, Dalila T.

doi:10.1007/978-3-319-56985-7_13

Cited by 5 publications

(2 citation statements)

References 106 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Only four studies have been published regarding the impact of noise pollution on the acoustic behaviour of the Guiana dolphin in Brazil: (i) one in Guanabara Bay, Rio de Janeiro state BRSE2 (Bittencourt et al, 2017); (ii) one in Cananéia, São Paulo state -BRS/SE (Resende, 2008); (iii) one in Caravelas estuary, Bahia state -BRNE4 (Pais et al, 2018); and (iv) one in the district of Pipa, Rio Grande do Norte state -BRNE2 (Martins et al, 2018). Changes in the whistles acoustic parameters were recorded for some studies and suggested as a response to the high underwater noise.…”

Section: Noise Pollution and Collisionsmentioning

confidence: 99%

“…Stutz Reis (2013) observed different responses in Bevenuete bay, in Espirito Santo's state (BRS1), where Guiana dolphins produced longer whistles in a noisy habitat. In general, published and unpublished data (grey literature) from different areas along the Brazilian coast highlighted potential communication masking of Guiana dolphin acoustic signals when they are using noise areas (Alburquerque and Souto, 2013;Domit et al, 2018;Martins et al, 2018;Pais et al, 2018;Resende, 2008;Rossi-Santos, pers. comm.).…”

Section: Noise Pollution and Collisionsmentioning

confidence: 99%

See 1 more Smart Citation

Report of the Sotalia guianensis Pre-Assessment Workshop (São Paulo, Brazil, 26-28 November 2019)

2021

JCRM

View full text Add to dashboard Cite

show abstract

Section: Noise Pollution and Collisionsmentioning

confidence: 99%

Section: Noise Pollution and Collisionsmentioning

confidence: 99%

Report of the Sotalia guianensis Pre-Assessment Workshop (São Paulo, Brazil, 26-28 November 2019)

2021

JCRM

View full text Add to dashboard Cite

show abstract

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

View full text Add to dashboard Cite

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.

show abstract

Stay here, but keep quiet: the effects of anthropogenic noise on Guiana dolphins (Sotalia guianensis) in southeastern Brazil

Maciel,

Belderrain,

Alves

et al. 2023

Mar Biol

View full text Add to dashboard Cite

Shipping is the principal source of anthropogenic noise in the aquatic soundscape of coastal areas.Noise can have temporary or permanent effects on the physiology, behavior, and ecology of the marine mammals and, as noise pollution is considered to be an important threat to Guiana dolphins (Sotalia guianensis), we focused on this question in the present study. We modeled the impacts of anthropogenic noise on the acoustic behavior and distribution of these dolphins. We considered the acoustic parameters and occurrence of Guiana dolphins as the response variables and Sound Exposure Levels (SEL) and environmental factors as the explanatory variables. The dolphins used noisier areas but communicated mainly in less noisy areas, given that anthropogenic noise levels induced a reduction in whistle rates.Although the dolphins did not appear to avoid the noisiest areas, their communication was impaired, and there may be areas in which communication is impracticable in this species.

show abstract

Anthropogenic Noise and Guiana Dolphins (Sotalia guianensis) in Brazil: Ecological and Conservation Concerns

Cited by 5 publications

References 106 publications

Report of the Sotalia guianensis Pre-Assessment Workshop (São Paulo, Brazil, 26-28 November 2019)

Report of the Sotalia guianensis Pre-Assessment Workshop (São Paulo, Brazil, 26-28 November 2019)

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

Stay here, but keep quiet: the effects of anthropogenic noise on Guiana dolphins (Sotalia guianensis) in southeastern Brazil

Contact Info

Product

Resources

About