Total tin (TSn) biomagnification: Evaluating organotin trophic flow and dispersion using hepatic TSn concentrations and stable isotope (C, N) data of nektonic organisms from Brazil

Schilithz, Priscila Ferreira; Paiva, Thaís de Castro; Flach, Leonardo; Barbosa, Lupércio A.; Domit, Camila; Cremer, Marta Jussara; Azevedo-Silva, Cláudio E.; Azevedo, Alexandre F.; Malm, Olaf; Lepoint, Gilles; Bisi, Tatiana L.; Das, Krishna; Lailson‐Brito, José

doi:10.1016/j.marenvres.2020.105063

Cited by 6 publications

(3 citation statements)

References 116 publications

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“…However, strong economic pressure has been occurring for the construction of at least three new harbor terminals in the innermost regions of the bay, directly affecting the franciscanas' current home range. Many direct impacts would be associated with the construction of these new harbors, including a large increase in noise pollution, degradation of habitat and communities due to dredging and explosions to deepen navigation channels, and increased levels of environmental contaminants (e.g., Domit et al, 2009; Dorneles et al, 2020; Richardson et al, 1995). In addition, the harbor and navigation areas are inaccessible to fishermen under Brazilian law, which restricts the areas available both for fishing and for both cetacean species in the area, increasing overlap and risk of incidental captures, another threat for franciscanas in Baía Babitonga (Cremer et al, 2018; Pinheiro & Cremer, 2003).…”

Section: Discussionmentioning

confidence: 99%

Tagging, ranging patterns, and behavior of franciscana dolphins (Pontoporia blainvillei) off Argentina and Brazil: Considerations for conservation

Wells

Cremer

Berninsone

et al. 2021

Marine Mammal Science

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The franciscana dolphin, Pontoporia blainvillei, is one of the most threatened cetaceans in the Southwestern Atlantic. Within their limited coastal range off Argentina, Uruguay, and Brazil, franciscanas face human activities, including artisanal gillnet fishing and coastal development. A lack of information on ranging patterns, population structure, and behavior for informing management led to efforts to develop and apply approaches to tag franciscanas in Argentina (Bahía Samborombón [BS], Bahía San Blas [BSB]) and Brazil (Baía Babitonga [BB]) during 2005–2013. Findings from VHF tags deployed in BS in 2005 during feasibility tests for catching and handling franciscanas for tagging suggested residency over periods of weeks. Subsequently, satellite‐linked tags confirmed patterns of residency at each site. Home range size varied, with ranges of 5–7 km2 for BB, 51–312 km2 for BS, and 49–1,014 km2 for BSB. Diving patterns varied across sites, with the animals using the entire water column, exposing them to fishing nets regardless of the depth at which the nets were set. Tracking durations and follow‐up observations indicated that this research approach is useful for studies of franciscanas. Small, definable ranges facilitate relating specific geographically based threats to appropriate population units, increasing the potential for effective conservation.

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Section: Discussionmentioning

confidence: 99%

Tagging, ranging patterns, and behavior of franciscana dolphins (Pontoporia blainvillei) off Argentina and Brazil: Considerations for conservation

Wells

Cremer

Berninsone

et al. 2021

Marine Mammal Science

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“…A significant and positive slope (b > 0) of a log-linear regression between pollutant concentration and δ 15 N (Log 10 [Pollutant] = a+b (δ 15 N)) indicates pollutant biomagnification in a food web (Lavoie et al 2013). The slope (b) of regression, which is called Trophic Magnification Slope (TMS), has been used to estimate contaminant biomagnification in different food webs (Kidd et al 2003;Campbell et al 2005;Lavoie et al 2013;Poste et al 2015;Dorneles et al 2020), facilitating the comparison between ecosystems.…”

Section: Biomagnification Estimationmentioning

confidence: 99%

Trophic dynamics of methylmercury and trace elements in a remote Amazonian Lake

Azevedo-Silva¹,

Pizzochero²,

Galvão³

et al. 2023

Environmental Research

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“…Throughout their distribution, Guiana dolphins are exposed to several human activities. Off the Brazilian coast, for instance, they are often threatened by vessel collision (Domiciano et al 2016), entanglement and incidental mortality in fishing gear (Moura et al 2014;Domiciano et al 2016), bioaccumulation of chemical compounds (Dorneles et al 2008(Dorneles et al , 2020Lailson-Brito et al 2010;Vidal et al 2020;Manhães et al 2021;Trevizani et al 2021), and exposure to emerging diseases (Sacristán et al 2018;Sanchez-Sarmiento et al 2019;Groch et al 2020). These cumulative anthropogenic impacts may cause injuries (Domiciano et al 2016) and health disorders, such as immune depression (Moura et al 2014;Domiciano et al 2016;Manhães et al 2021), poor body condition (Reif et al 2009;Van Bressem et al 2009a, b;Domiciano et al 2016), a higher prevalence of skin lesions and infectious diseases (Van Bressem et al 2009a;Groch et al 2014;Seade et al 2017;Sacristán et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Health conditions of Guiana dolphins facing cumulative anthropogenic impacts

et al. 2022

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Coastal areas are associated with anthropogenic activities and stressors that can expose the marine fauna to negative cumulative impacts. Apex predators, such as dolphins, can flag the quality of their environment through health parameters such as cutaneous and body conditions. We examined the potential relationship between environmental conditions and health parameters of Guiana dolphins around a port and a conservation unit within the Paranaguá Estuarine Complex, southern Brazil. During boat surveys between July 2018 and April 2019 covering both areas, we measured environmental parameters, photographed dolphins to infer their health condition and the frequency of use of the estuary. In total, 204 individual Guiana dolphins were photo-identified, 52 of which were seen in both years. In general, dolphins showed poor body condition (76% classified as emaciated or thin in 2018, and 79% in 2019), diverse cutaneous conditions (four types of lesions suggestive of an infectious aetiology, two conditions suggestive of traumatic events of anthropogenic origin, and two anomalous pigmentation) and a high prevalence of such cutaneous conditions (85% in 2018, 70% in 2019). Most individuals maintained their body and cutaneous conditions between the two years. There were no clear differences between the port and the conservation areas in terms of environmental conditions, frequency of use and health conditions of individual dolphins, suggesting that dolphins inhabiting this estuarine complex are exposed to potential cumulative impacts, such as pollutants, noise and habitat degradation. This study provides baseline information on some health parameters of Guiana dolphins in southern Brazil and highlights the need for systematic, long-term health assessment of Guiana dolphin populations to guide conservation actions to safeguard this vulnerable species.

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Total tin (TSn) biomagnification: Evaluating organotin trophic flow and dispersion using hepatic TSn concentrations and stable isotope (C, N) data of nektonic organisms from Brazil

Cited by 6 publications

References 116 publications

Tagging, ranging patterns, and behavior of franciscana dolphins (Pontoporia blainvillei) off Argentina and Brazil: Considerations for conservation

Tagging, ranging patterns, and behavior of franciscana dolphins (Pontoporia blainvillei) off Argentina and Brazil: Considerations for conservation

Trophic dynamics of methylmercury and trace elements in a remote Amazonian Lake

Health conditions of Guiana dolphins facing cumulative anthropogenic impacts

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