Total and subcellular Ti distribution and detoxification processes in Pontoporia blainvillei and Steno bredanensis dolphins from Southeastern Brazil

Monteiro, Fernanda de Souza; Lemos, Leila S.; Moura, Jailson Fulgêncio de; Rocha, Rafael Christian Chávez; Moreira, Isabel; Beneditto, Ana Paula Madeira Di; Kehrig, Helena A.; Bordon, Isabella C.; Siciliano, Salvatore; Saint’Pierre, Tatiana Dillenburg; Hauser‐Davis, Rachel Ann

doi:10.1016/j.marpolbul.2020.110975

Cited by 6 publications

(5 citation statements)

References 48 publications

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“…[39][40][41][42][43] Some contaminants of emerging concern, such as titanium, have also recently been detected in different P. blainvillei organs, with proven subcellular partitioning, indicating systemic contamination with unknown physiological effects. 44 As stated previously, cholangiocellular adenomas are benign tumour that may be precursors to cholangiocellular carcinomas. 20 If this hypothesis is correct, the fact that cholangiocellular adenomas are benign is most often an incidental finding that can be overlooked or not detected, due to tumour size, which may account for a lack of reports of this kind in cetaceans.…”

Section: Discussionmentioning

confidence: 87%

“…These contaminants are a major health concern for P. blainvillei populations, as they exhibit high carcinogenic, neurotoxic, immunosuppressive and endocrine disruptive potential 39–43 . Some contaminants of emerging concern, such as titanium, have also recently been detected in different P. blainvillei organs, with proven subcellular partitioning, indicating systemic contamination with unknown physiological effects 44 …”

Section: Discussionmentioning

confidence: 99%

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Cholangiocellular adenoma in Franciscana dolphins (Pontoporia blainvillei)

Jerdy,

Ribeiro,

Souza

et al. 2023

Vet Record Case Reports

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Pontoporia blainvillei, commonly known as the Franciscana dolphin, inhabits the coastal waters of South America and is classified as vulnerable and as undergoing significant population declines. This species is generally found in turbid coastal waters, although it is also found in clear waters, as well as marine areas associated with islands and rocky shores. Tumours originating from cholangiocytes have been rarely described in cetaceans, with descriptions limited to cholangiocellular carcinomas. Cholangiocellular adenomas are characterised by the formation of bile ducts and are rarer than cholangiocellular carcinoma. This study described the first report of a tumour originating from cholangiocytes in P. blainvillei, raising concerns on this endangered cetacean's health status and conservation. The underlying causes of this tumour in Franciscana dolphins remain unknown, highlighting the need for further research.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Cholangiocellular adenoma in Franciscana dolphins (Pontoporia blainvillei)

Jerdy,

Ribeiro,

Souza

et al. 2023

Vet Record Case Reports

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“…Conversely, selenium is acknowledged as an essential element for metabolic activity of aquatic mammals, performing as a protective agent against the toxicity of exogenous metals such as mercury and silver (Feroci et al, 2005;Baptista et al, 2016). Recently, Ti concentrations and metalloprotein detoxification in livers of franciscanas dolphins from southeastern Brazil were assessed (Monteiro et al, 2020).…”

Section: Chemical Pollutionmentioning

confidence: 99%

A Synthesis of the Ecology, Human-Related Threats and Conservation Perspectives for the Endangered Franciscana Dolphin

et al. 2021

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The franciscana is endemic to subtropical coastal waters of Brazil, Uruguay, and Argentina, and is the only living species of the family Pontoporiidae. It is regarded as the most endangered cetacean in the western South Atlantic. Five management units are recognized (Franciscana Management Areas, FMAs – sensu Secchi et al., 2003a), with abundance estimates ranging from a few hundred to around 15,000 dolphins. Low reproductive potential and short life span make this species highly susceptible to current non-natural removal rates. Bycatch in gillnet fisheries occurs in high levels since the 1960s in Uruguay and 1980s in Brazil and Argentina. Although other threats exist, such as habitat degradation that includes physical (noise) and chemical pollution, depletion of fish stocks and climate change, incidental mortality in gillnets is currently the greatest threat to franciscanas. Fishing-related mortality ranges from approximately 100, in FMA I, to more than 1,000 in FMA III, and exceed from near two (in FMA IV) to more than five times (in FMA III) the maximum allowed sustainable mortality rate, based on potential biological removal (PBR) approach. These numbers indicate that the species is unlikely to cope with the current levels of bycatch and that urgent and extreme reduction on fishing practice and effort are required to avoid collapse of the franciscana and to lower its risk of extinction. Current mortality levels and projected declines resulted in the listing of the franciscana as “Vulnerable” in the IUCN Red List. Recent fisheries regulations were implemented in areas with extensive bycatch in Brazil and were expected to improve the species’ conservation status. There is evidence, however, that this regulation is insufficient to reduce fishing-related mortality to sustainable levels due to either or both lack of compliance and inadequate regulation strategies. Here we provide a comprehensive review on the franciscana ecology and threats and discuss perspectives for its conservation.

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“…These local port activities provide logistics to the oil and gas production that have been growing since then, affecting coastal areas (Zappes et al 2016). In this context, recent assessments have indicated a considerable burden of contaminants in populations of rough-toothed dolphins along the SE Brazilian coast (Monteiro et al 2019(Monteiro et al , 2020. This study presents the solitary behavior of a sociable rough-toothed dolphin in a port area on northern Rio de Janeiro State, Brazil.…”

Section: Introductionmentioning

confidence: 98%

A solitary rough-toothed dolphin (Steno bredanensis) in a superport area on northern Rio de Janeiro State, SE Brazil

Beneditto

Siciliano

2020

Biota Neotrop.

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The solitary behavior is an unusual and peculiar behavior reported in a few sociable dolphin species. This study presents the solitary behavior of an adult rough-toothed dolphin, Steno bredanensis, in the Açu Superport (21º49’S; 041º00’W), northern Rio de Janeiro State, SE Brazil. Data about the dolphin were obtained from mobile phone videos and reports by local professionals. Probably, the same dolphin was there since 2017-2018 up to April 2020 (at least). In general, the solitary dolphin swims next to supply boats navigating along the port internal channel, and it rarely continues towards open sea. The dolphin plays with buoys and containment barriers, rubs itself against hulls, and bow-rides and jumps. There is no report of people swimming with this solitary dolphin, touching it, or offering it food in the Açu Superport. Thus, there seems to be no threats to the animal’s integrity locally.

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Total and subcellular Ti distribution and detoxification processes in Pontoporia blainvillei and Steno bredanensis dolphins from Southeastern Brazil

Cited by 6 publications

References 48 publications

Cholangiocellular adenoma in Franciscana dolphins (Pontoporia blainvillei)

Cholangiocellular adenoma in Franciscana dolphins (Pontoporia blainvillei)

A Synthesis of the Ecology, Human-Related Threats and Conservation Perspectives for the Endangered Franciscana Dolphin

A solitary rough-toothed dolphin (Steno bredanensis) in a superport area on northern Rio de Janeiro State, SE Brazil

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