Guiana dolphins, Sotalia guianensis (Cetacea: Delphinidae), in the Paranaguá Estuarine Complex: insights on the use of area based on the photo-identification technique

Santos, M. A. L.; Oshima, Júlia Emi de Faria; Pacífico, Eduardo dos Santos; Silva, Ednilson da

doi:10.1590/s1984-46702010000300002

Cited by 7 publications

(4 citation statements)

References 24 publications

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“…an assumption of resident populations (Rosas & Monteiro-Filho, 2002;Santos, Oshima, Pacífico, & Silva, 2010). These findings agree with previous assessments in other estuaries,…”

Section: Baseline Values Of δ 13 C and δ 15 N And Ecological Relationsupporting

confidence: 92%

Trophic dynamics in two South American estuaries encompassing industrial development and a biodiversity hotspot

Trevizani

Domit

Broadhurst

et al. 2019

Aquatic Conservation

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1. Estuaries are critical to the life histories and development of many marine species, and support some of the most productive aquatic ecosystems. But, owing to their geographic accessibility, many estuaries face considerable anthropogenic threats, which can be exacerbated in developing nations. 2. Understanding the ecological implications of anthropogenic activities as a precursor to dedicated conservation activities requires comprehensive assessments of baseline trophic relationships. This study addresses a shortfall in such information for two tropical, coastal ecosystems globally identified as priority areas for biodiversity conservation: the Paranaguá estuarine complex and Cananéia-Iguape estuarine lagoon system in southern Brazil. 3. Ecological relationships were investigated through carbon and nitrogen stable isotope (δ 13 C and δ 15 N) determination in sediments, plant fragments and the muscle tissues of marine species occupying different trophic levels, including benthic invertebrates, This article is protected by copyright. All rights reserved. This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

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“…an assumption of resident populations (Rosas & Monteiro-Filho, 2002;Santos, Oshima, Pacífico, & Silva, 2010). These findings agree with previous assessments in other estuaries,…”

Section: Baseline Values Of δ 13 C and δ 15 N And Ecological Relationsupporting

confidence: 92%

Trophic dynamics in two South American estuaries encompassing industrial development and a biodiversity hotspot

Trevizani

Domit

Broadhurst

et al. 2019

Aquatic Conservation

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“…Investigations in the CE took place from 2000 to 2010 in 132 km 2 of inner estuarine waters used by Guiana dolphins (see details in Oshima et al 2010, Oshima & Santos 2016. In the PEC, investigations on Guiana dolphins were conducted between 2006 and 2009 in 124 km 2 of protected estuarine waters (see Santos et al 2010b). The Sepetiba Bay (SPB), on the coast of Rio de Janeiro state, is 526 km 2 , with ca.…”

Section: Methodsmentioning

confidence: 99%

Cetacean movements in coastal waters of the southwestern Atlantic ocean

Santos

Lailson‐Brito

Flach³

et al. 2019

Biota Neotrop.

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Cetaceans were monitored along ca. 700 km of the southeast coast of Brazil (22°S to 25°S) from 1995 to 2014 using photo-identification. The objective of this study was to identify any presence of long-distance movements for monitored cetacean species and discuss implications. Data on long-range movements of four of the monitored species are presented after the analysis of 321,765 photographs taken for individual identification. Seven individuals from four populations of Guiana dolphins (Sotalia guianensis) considered resident to particular estuaries or bays were reported in dispersal involving movement between pairs of protected areas over long-range distances varying between 86 and 135 km. Three cataloged rough-toothed dolphins (Steno bredanensis), first seen in Guanabara Bay, Rio de Janeiro state (22°46'S) in November 2011, were sighted 240 km southwards as members of the same group in coastal waters of São Paulo state (23°46'S) in July 2014. Water depth for those sightings ranged from 16 to 52.7 m; local sightings of rough-toothed dolphins in Brazil have frequently been in shallow waters, but the species global distribution is usually associated with deeper waters. In a 27-day interval in the spring of 2012, a group of 16 orcas (Orcinus orca) travelled ca. 277 km in shallow coastal waters ranging from 20 to 30 m deep. Orcas are commonly observed between November and February in southeast Brazil, probably in search for prey. In summer months between 2012 and 2014, three Bryde's whales (Balaenoptera edeni) sighted in waters ranging from 14 to 49 m deep, moved between 218 and 327 km. Bryde's whales are usually found in local coastal waters where they spend summer months feeding on sardines. To date, these are the longest estimated movements reported to S. guianensis, S. bredanensis, O. orca and B. edeni in the Southwestern Atlantic Ocean.

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“…The proportion of dolphins sighted more than once, and therefore exhibiting site fidelity to the study area, was moderate in the ME (64%). This rate varies along the species distribution, from 36.0 to 96.7% (Flores, 1999; Santos, Barão Acuña & Rosso, 2001; Azevedo et al, 2004; Nery, Espécie & Simão, 2008; Espécie, Tardin & Simão, 2010; Hardt et al, 2010; Santos et al, 2010b; Batista et al, 2014). In Iracema Beach, inside ME, this proportion was also moderate, with 50% of the identified dolphins showing site fidelity (Meirelles, Campos & Fonteles‐Filho, 2020).…”

Section: Discussionmentioning

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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Guiana dolphins, Sotalia guianensis (Cetacea: Delphinidae), in the Paranaguá Estuarine Complex: insights on the use of area based on the photo-identification technique

Cited by 7 publications

References 24 publications

Trophic dynamics in two South American estuaries encompassing industrial development and a biodiversity hotspot

Trophic dynamics in two South American estuaries encompassing industrial development and a biodiversity hotspot

Cetacean movements in coastal waters of the southwestern Atlantic ocean

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

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