Cephalopods and cetaceans as indicators of offshore bioavailability of cadmium off Central South Brazil Bight

Dorneles, Paulo R.; Lailson‐Brito, José; Santos, Roberta Aguiar dos; Costa, Paulo A. S.; Malm, Olaf; Azevedo, Alexandre F.; Torres, João Paulo Machado

doi:10.1016/j.envpol.2006.09.022

Cited by 82 publications

(47 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The concerns generated by the DRC contamination are amplified when it is taken into account that these cetaceans are exposed to other persistent bioaccumulative toxicants (PBTs) that have been shown to be endocrine disrupters, tumor promoters and immunosuppressors as well (Schecter et al, 2006;Simonyte et al, 2006;Sonne et al, 2006a;Whalen et al, 1999). The high exposure of cetaceans from Brazil to cadmium (Dorneles et al, 2007a(Dorneles et al, , 2007b, mercury (Lailson-Brito et al, 2012a), organochlorine pesticides (Lailson-Brito et al, 2011, 2010, 2012b, as well as to organotin (Dorneles et al, 2008b), perfluoroalkyl (Dorneles et al, 2008a) and organobrominated (Alonso et al, 2012;Dorneles et al, 2010) compounds has already been reported. Therefore, the possibility of synergistic effects among these PBTs should not be ruled out.…”

Section: A Serious Pcb Problemmentioning

confidence: 99%

“…Rough-toothed dolphins and false killer whales occur in tropical to warm temperate waters all over the world (Baird, 2009;Miyazaki and Perrin, 1994). In Brazil, these species occur predominantly on the continental shelf (Bisi, 2011;Dorneles et al, 2010Dorneles et al, , 2008bDorneles et al, , 2007a and rough-toothed dolphins can even be found in shallow coastal waters (Flores and Ximinez, 1997). Rough-toothed dolphins can occasionally reach more than 2.8 m of total length (Jefferson, 2009).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High accumulation of PCDD, PCDF, and PCB congeners in marine mammals from Brazil: A serious PCB problem

Dorneles

Sanz

Eppe

et al. 2013

Science of The Total Environment

Self Cite

View full text Add to dashboard Cite

• Dioxin-like PCBs accounted for over 83% of the total TEQ for all cetaceans • Negative correlations were found between length and TEQ values in franciscanas.• PCB concentrations found are among the highest ever reported for cetaceans. a b s t r a c t a r t i c l e i n f o Blubber samples from three delphinid species (false killer whale, Guiana and rough-toothed dolphin), as well as liver samples from franciscana dolphins were analyzed for dioxins and related compounds (DRCs). Samples were collected from 35 cetaceans stranded or incidentally captured in a highly industrialized and urbanized area (Southeast and Southern Brazilian regions). Dioxin-like PCBs accounted for over 83% of the total TEQ for all cetaceans. Non-ortho coplanar PCBs, for franciscanas (82%), and mono-ortho PCBs (up to 80%), for delphinids, constituted the groups of highest contribution to total TEQ. Regarding franciscana dolphins, significant negative correlations were found between total length (TL) and three variables, ΣTEQ-DRCs, ΣTEQ-PCDF and ΣTEQ non-ortho PCB. An increasing efficiency of the detoxifying activity with the growth of the animal may be a plausible explanation for these findings. This hypothesis is reinforced by the significant negative correlation found between TL and PCB126/PCB169 concentration ratio. DRC concentrations (ng/g lipids) varied from 36 to 3006, for franciscana dolphins, as well as from 356 to 30,776, for delphinids. The sum of dioxin-like and indicator PCBs varied from 34,662 to 279,407 ng/g lipids, for Guiana dolphins from Rio de Janeiro state, which are among the highest PCB concentrations ever reported for cetaceans. The high concentrations found in our study raise concern not only on the conservation of Brazilian coastal cetaceans, but also on the possibility of human health problem due to consumption of fish from Brazilian estuaries.

show abstract

Section: A Serious Pcb Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High accumulation of PCDD, PCDF, and PCB congeners in marine mammals from Brazil: A serious PCB problem

Dorneles

Sanz

Eppe

et al. 2013

Science of The Total Environment

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, high pollutant concentrations in squids and marine mammals (such as whales and dolphins like Stenella frontaris, Pseudorca crassidens, Tursiops truncatus, Steno bredanensis and Delphinus delphis) from the Rio de Janeiro coast are associated with the rising of SACW (DORNELES et al, 2007;.…”

Section: Nekton Trophodynamics and Fishery Productionmentioning

confidence: 99%

Biophysical interactions in the Cabo Frio upwelling system, southeastern Brazil

et al. 2012

View full text Add to dashboard Cite

A B S T R A C TThe rising of cold water from deeper levels characterizes coastal upwelling systems. This flow makes nutrients available in the euphotic layer, which enhances phytoplankton production and growth. On the Brazilian coast, upwelling is most intense in the Cabo Frio region (RJ). The basic knowledge of this system was reviewed in accordance with concepts of biophysical interactions. The high frequency and amplitude of the prevailing winds are the main factor promoting the rise of South Atlantic Central Water, but meanders and eddies in the Brazil Current as well as local topography and coast line are also important. Upwelling events are common during spring/summer seasons. Primary biomass is exported by virtue of the water circulation and is also controlled by rapid zooplankton predation. Small pelagic fish regulate plankton growth and in their turn are preyed on by predatory fish. Sardine furnishes an important regional fish stock. Shoreline irregularities define the embayment formation of the Marine Extractive Reserve of Arraial do Cabo making it an area with evident different intensities of upwelled water that harbors high species diversity. Consequently, on a small spatial scale there are environments with tropical and subtropical features, a point to be explored as a particularity of this ecosystem. R E S U M OOs sistemas costeiros de ressurgência são caracterizados pela ascensão de águas frias que tornam os nutrientes disponíveis na camada eufótica para o crescimento e aumento da produção fitoplanctônica. No Brasil, a região do Cabo Frio (RJ) é o principal sistema de ressurgência costeira. O objetivo desse artigo foi revisar o atual conhecimento desse sistema através dos conceitos sobre interações biofísicas. A ascensão da Água Central do Atlântico Sul ocorre devido à alta frequência e amplitude dos ventos, à presença de meandros e vórtices na Corrente do Brasil, além da topografia local e da linha de costa. Os eventos de ressurgência são comuns durante os períodos de primavera/verão e a biomassa primária é exportada devido à circulação da água, sendo também controlada pela rápida predação zooplanctônica. Os pequenos peixes pelágicos regulam o crescimento do plâncton e são consumidos pelos peixes predadores, resultando em um importante estoque pesqueiro regional. A irregularidade da costa define as enseadas do Cabo Frio, na Reserva Extrativista Marinha do Arraial do Cabo, apresentando distintas influências das águas ressurgidas e resultando em grande diversidade de espécies. Consequentemente, ambientes com características tropicais e subtropicais são observados dentro de uma pequena escala espacial, o que constitui uma particularidade desse ecossistema.

show abstract

“…12 The study of trace elements in marine mammals is in its infancy in Brazil where few studies documented their concentrations in the tissues of cetaceans species with coastal habits such as Sotalia guianensis, Pontoporia blainvillei and oceanic habits such as Stenella frontalis. 7,11,[13][14][15][16][17] Furthermore, extensive studies of As, Cd, Cu, Pb, Se and Ag concentrations in cetaceans have been carried out in Northern Hemisphere 5,8,10,12,[18][19][20][21][22][23][24][25][26][27][28][29][30] but relatively little is known about contaminant levels in Southern Hemisphere cetaceans. [31][32][33][34][35] Then, the present research adds new insight to and complements the existing studies.…”

Section: Introductionmentioning

confidence: 99%

Trace elements in different species of cetacean from Rio de Janeiro coast

Seixas¹,

Kehrig²,

Beneditto³

et al. 2009

J. Braz. Chem. Soc.

Self Cite

View full text Add to dashboard Cite

Neste estudo avaliou-se a influência de alguns parâmetros ecológicos e biológicos sobre a acumulação dos elementos-traço (As, Cd, Cu, Pb, Se e Ag) no fígado de três espécies de cetáceos, sendo duas de hábito costeiro (Pontoporia blainvillei e Sotalia guianensis) e uma de hábito oceânico (Stenella frontalis), que foram acidentalmente capturados na costa norte do estado do Rio de Janeiro. Diferenças inter-espécies foram observadas no padrão de acumulação dos elementos-traço, Cd e Pb (5,12 ± 0,74 µg g -1 e 21,25 ± 1,35 µg g -1 , respectivamente). Entretanto, as três espécies de cetáceo, S. guianensis, P. blainvillei e S. frontalis apresentaram concentrações hepáticas de As, Cu e Ag similares. O sexo dos indivíduos não influiu na bioacumulação dos elementos. O comprimento total influenciou na acumulação dos elementos-traço no fígado de acordo com a espécie de cetáceo. S. guianensis, que co-habita o mesmo ambiente que a espécie P. blainvillei, apresentou uma diferença significativa na concentração hepática de selênio (20,70 ± 32,22 µg g -1 e 3,24 ± 2,02 µg g -1 , respectivamente). A partir dessas observações pode-se concluir que condições ambientais e parâmetros biológicos, tais como comprimento total e principalmente a preferência alimentar, influenciaram significativamente a acumulação de elementos traço no fígado dessas espécies de cetáceos.The present work tested whether ecological and biological parameters have an influence on the accumulation of trace elements (As, Cd, Cu, Pb, Se and Ag) by the liver of three cetaceans species: two species of coastal habit (Pontoporia blainvillei and Sotalia guianensis) and one of oceanic habit (Stenella frontalis), that were incidentally caught in fishing nets along the north of Rio de Janeiro coast. Inter-species difference was observed on the accumulation of Cd and Pb (5.12 ± 0.74 µg g -1 and 21.25 ± 1.35 µg g -1 , respectively). However, the three cetacean species, S. guianensis, P. blainvillei and S. frontalis presented similar hepatic concentrations of As, Cu and Ag. No gender differences were found on the bioaccumulation of trace elements. Hepatic trace element accumulation was influenced by body length, according to the cetacean species. S. guianensis, which co-habits the same coastal marine environment that P. blainvillei species, presented a significant difference between hepatic selenium concentration (20.70 ± 32.22 µg g -1 and 3.24 ± 2.02 µg g -1 , respectively). Based on these results, it is possible to conclude that, not only the different environmental conditions, but also total length and mainly the feeding habit influenced the accumulation of trace elements by the liver of these cetacean species.

show abstract

Cephalopods and cetaceans as indicators of offshore bioavailability of cadmium off Central South Brazil Bight

Cited by 82 publications

References 37 publications

High accumulation of PCDD, PCDF, and PCB congeners in marine mammals from Brazil: A serious PCB problem

High accumulation of PCDD, PCDF, and PCB congeners in marine mammals from Brazil: A serious PCB problem

Biophysical interactions in the Cabo Frio upwelling system, southeastern Brazil

Trace elements in different species of cetacean from Rio de Janeiro coast

Contact Info

Product

Resources

About