Temporal trends of trace elements bioaccumulation by a vulnerable cetacean (Pontoporia blainvillei) before and after one of the largest mining disasters worldwide

Manhães, Bárbara Moura Reis; Vannuci-Silva, Monizze; Brião, Juliana A.; Guari, Emi B.; Botta, Silvina; Colosio, Adriana Castaldo; Ramos, Hernani G. C.; Barbosa, Lupércio A.; Cunha, Ian A.G.; Azevedo, Alexandre F.; Cunha, Haydée A.; Bisi, Tatiana L.; Lailson‐Brito, José

doi:10.1016/j.scitotenv.2021.150196

Cited by 24 publications

(9 citation statements)

References 72 publications

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“…However, they can also be attributed to degradation in environmental quality, such as pollution and other disturbances (Lailson-Brito et al, 2002;. The Fundão dam disaster impacted the FMA Ia region (Mayorga et al, 2020;Marcondes et al, 2020;Manhães et al, 2022). This incident is being monitored to understand the environmental impact over this population.…”

Section: Discussionmentioning

confidence: 99%

“…Franciscana dolphins are classified as Vulnerable by the Red List of the International Union for Conservation of Nature (Zerbini et al, 2017) and Critically Endangered according to the Red Book of Brazilian Fauna Threatened with Extinction (ICMBio, 2018). In general, they inhabit turbid waters shallower than 30 m. Due to the coastal characteristics of their distribution, they are subject to a series of disturbances and anthropogenic threats, especially incidental catch in fishing nets (Secchi et al, 2003;Danilewicz et al, 2009;Prado et al, 2013) and contamination by environmental degradation and chemical pollution (Lailson-Brito et al, 2002;Manhães et al, 2022). Secchi et al (2003) proposed four "Franciscana Management Areas" (FMAs) which aim is to guide conservation efforts on a regional basis: two of these areas are located in southeastern and southern Brazil (FMA I and II), one in southern Brazil and Uruguay (FMA III) and one in Argentina (FMA IV).…”

Section: Introductionmentioning

confidence: 99%

“…The FMA I includes animals from Espírito Santo and the northern region of Rio de Janeiro and was later subdivided into two by Cunha et al (2014) due to the recognition of genetic differentiation between them; therefore, the population located in Espírito Santo is now classified as FMA Ia and that of Rio de Janeiro as FMA Ib. The FMA Ia subpopulation is the most isolated and threatened (Manhães et al, 2022). It is the smallest, with approximately 595 individuals (Sucunza et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Carcass non-recovery rate of franciscana dolphin (Pontoporia blainvillei), calibrated with a drift mark-recapture study at FMA Ia, Brazil

Ramos

Colosio²,

Marcondes³

et al. 2022

Lat. Am. J. Aquat. Mamm.

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The franciscana dolphin (Pontoporia blainvillei) is one of the smallest dolphins globally and the most threatened in the Southwest Atlantic Ocean. Beach monitoring helps to investigate cetacean strandings within their distributions and assess impacts that cause mortality. Using drifters in mark-recapture studies helps to estimate recovery rates when carcasses are unavailable. The study aims to estimate the non-recovery rate of franciscana carcasses from FMA Ia by comparing the spatial distribution between carcasses and drifters along the coast; correlating the influence of cold fronts with the recovery rate of drifters; estimating the non-recovery rate of carcasses according to the drifters’ results and the meteorological profile in the pre-stranding period; characterizing the death diagnostic with temporal distribution of franciscanas by considering the stranding index and the carcass non-recovery rates. We repeated the release of 54 drifters in two campaigns close to the coast within the range of franciscana dolphins, where beaches are monitored daily, in the north region of Espírito Santo state, Brazil. The carcass stranding hotspots (21%) and drifters (18%) were 10 km apart. Cold fronts significantly increase the number of strandings. Considering the incidence of cold fronts in the pre-stranding period and linear regression from drifters, the median carcass recovery rate is 0.26, 95% IC [0.22 - 0.29], which means that for each stranding, the carcass non-recovery rate varies from 0.78 to 0.71. The range between 265 to 350 estimates the total of carcasses from 77 strandings observed from 2003 to 2021. The record year of strandings was 2014 (n = 14). About 52% of records occurred in summer, and January is the month with the highest occurrence of strandings. Of the conclusive diagnoses (n = 43), around 77% (n = 33) were attributed to incidental capture in gillnets. Estimating the number of carcasses based on stranding records is essential for population viability analyses and conservation purposes, especially considering small and isolated populations as in the present study. To prevent local extinction, a solution to avoid incidental capture, especially along summers, must be addressed quickly.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Carcass non-recovery rate of franciscana dolphin (Pontoporia blainvillei), calibrated with a drift mark-recapture study at FMA Ia, Brazil

Ramos

Colosio²,

Marcondes³

et al. 2022

Lat. Am. J. Aquat. Mamm.

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“…This decline in concentration could be related to environmental alterations in the Abrolhos Bank due to diseases and changes in the community associated with climate change, and/or the decrease in biodiversity after the dam collapse. Manhães et al (2022) showed differences in trace element concentrations in franciscanas from FMA Ia. Hg, Mn and Zn concentrations increased after the collapse of the mining dam and reached the coast of Espírito Santo state.…”

Section: Update From Argentina Brazil and Uruguaymentioning

confidence: 92%

Report of the Workshop to Finalise the Review of the Franciscana (Curitiba, Brazil, 4-5 June 2022)

2023

JCRM

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“…Among the most toxic anthropogenic pollutants are organochlorine pesticides (OCPs) and trace metals that are environmentally persistent, become bioaccumulated and biomagnified due to their low water solubility and slow chemical decomposition 6 . The OCPs and trace metal residues are transported to the marine ecosystems by environmental factors such as effluents, wind, and rain, becoming bioavailable from marine sediments or water columns for the marine organisms 7 , 8 .…”

Section: Introductionmentioning

confidence: 99%

Health risk of consuming Sphoeroides spp. from the Navachiste Lagoon complex due to its trace metals and organochlorine pesticides content

Muñoz-Armenta

Pérez-González

Rodríguez-Meza

et al. 2022

Sci Rep

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The Navachiste complex (NAV) is impacted by neighbored human activities and is located in the southwestern coastal zone of the Gulf of California. The study determines the trace metal (TM) and organochlorine pesticides (OCP) health risk content in the edible tissue of Sphoeroides spp. from NAV. The daily intakes (EDI), target hazard quotient (THQ), hazard index (HI), and carcinogenic and non-carcinogenic risks were calculated. Twenty OCP and seven TM were detected. Cd, Cu, Fe, Mn, Pb, and Zn were above MRLs. The γ‒Chlordane was the most frequent OCP. The highest average concentration was for α‒HCH, followed by γ‒chlordane. With the high ratios of γ‒HCH, p, p′‒ DDD and p, p′‒DDD, and the absence of p, p′‒ DDT, the higher ratios for dieldrin and endrin than for aldrin, α‒ chlordane, γ‒chlordane, heptachlor, and heptachlor epoxide indicates historical contamination. In contrast, the residual products of methoxychlor, endosulfan, and its isomers indicate endosulfan's recent use. The TM EDI, THQ > 1 (at 120 g day−1), and the ILCR (> 1 × 10–6) were above minimum levels, showing a high-risk potential for cancer development in the long term.

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Temporal trends of trace elements bioaccumulation by a vulnerable cetacean (Pontoporia blainvillei) before and after one of the largest mining disasters worldwide

Cited by 24 publications

References 72 publications

Carcass non-recovery rate of franciscana dolphin (Pontoporia blainvillei), calibrated with a drift mark-recapture study at FMA Ia, Brazil

Carcass non-recovery rate of franciscana dolphin (Pontoporia blainvillei), calibrated with a drift mark-recapture study at FMA Ia, Brazil

Report of the Workshop to Finalise the Review of the Franciscana (Curitiba, Brazil, 4-5 June 2022)

Health risk of consuming Sphoeroides spp. from the Navachiste Lagoon complex due to its trace metals and organochlorine pesticides content

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