Organic contaminants and trace metals in the western South Atlantic upper continental margin: Anthropogenic influence on mud depocenters

Santos, Felipe Rodrigues dos; Neves, Patrícia Andrade; Kim, Bianca Sung Mi; Taniguchi, Satie; Lourenço, Rafael André; Timoszczuk, Cristian Taboada; Sotão, Basílio M.T.; Montone, Rosalinda Carmela; Figueira, Rubens César Lopes; Mahiques, Michel Michaelovitch de; Bı́cego, Márcia Caruso

doi:10.1016/j.marpolbul.2020.111087

Cited by 24 publications

(3 citation statements)

References 57 publications

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“…The heterotrophic microorganisms are known to use organic matter as an energy source (Azam et al, 1983;Fukami et al, 1983), thus the observed effect of the TOC and TN in the HMP. Additionally, the TOC concentrations were low when compared with Santos et al (2020); who obtained mean values of 1.02 ± 0.49 %, while we had means of 0.4 ± 0.33 %. The authors studied the continental margin of the SW Atlantic, with depths ranging from 10 to 300 m, which are shallower regions than ours.…”

Section: Spatial Distribution Patterns Of Abiotic Variablescontrasting

confidence: 59%

Contribution of chemoautotrophy and heterotrophy to the microbial carbon cycle in the Southwestern Atlantic Ocean

et al. 2022

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Dark carbon fixation (DCF) is a source of new and labile carbon in the deep ocean, while heterotrophic microbial production (HMP) promotes organic matter transfer through the microbial loop. Despite their ecological relevance, there is a scientific gap regarding the estimates of DCF and HMP in the Southwestern Atlantic Ocean. Thus, the aim of this study was to investigate the spatial distribution of DCF and HMP; their relevance to the ocean carbon cycle; their relationship with environmental parameters and amongst themselves on the upper slope of Santos Basin. The samples were collected at three different water depths and sediment layers aboard the R/V Alpha Crucis in November 2019. DCF and HMP rates were measured by 14 C-bicarbonate and 3 H-leucine incorporation, respectively, and incubated in the dark. In the water column, DCF rates varied from 1.51 x 10 1 to 3.24 x 10 2 µg C m -3 h -1 , which were one to two orders of magnitude lower than the HMP rates, from 1.26 x 10 2 to 1.48 x 10 4 µg C m -3 h -1 . In the sediments, the DCF ranged from 1.15 x 10 4 to 1.83 x 10 5 µg C m -3 h -1 , while HMP was one to four orders of magnitude lower, 3.22 x 10 1 to 1.56 x 10 3 µ gC m -3 h -1 . DCF rates were significantly higher in the sediments, due to a higher availability of energy sources than in the oligotrophic water above. The HMP had higher rates in the water column as it is deeply dependent on organic matter derived from photosynthesis. This is the first study to investigate DCF and HMP considering the water column and sediments of the Southwestern Atlantic Ocean, thus contributing to a better understanding of the microbial role in the marine carbon cycle and ecosystem functioning.

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Section: Spatial Distribution Patterns Of Abiotic Variablescontrasting

confidence: 59%

Contribution of chemoautotrophy and heterotrophy to the microbial carbon cycle in the Southwestern Atlantic Ocean

et al. 2022

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“…However, the sampling points located in the innermost sectors of the CIELC (Cubatão Sea) and in the northern site showed a higher composition of mud (silt/clay), ranging of 45 to 60%. Some studies of As content in aquatic ecosystems in Brazil have linked high levels of As in coastal and estuarine sediments to the enrichment of sediments by continental rocks (Angeli et al 2019, Kim et al 2020, Santos et al 2020. Therefore, the high natural concentration of As in the southern region of the CIELC may be another factor that influences the arsenic uptake of catfish from this area.…”

Section: Discussionmentioning

confidence: 99%

“…Residues of Pb, Ag, Cd and Zn from past mining activities and refinery (Company Plumbum) in the upstream cities of the Alto do Ribeira region were detected in sediment from the Mar Pequeno (Tramonte et al 2018). With respect to arsenic content in sediment, some authors consider it part of the natural enrichment process in the Ribeira de Iguape basin and along the estuary as a consequence of sediments being deposited by continental rocks (Figueiredo et al 2007, Angeli et al 2019, Santos et al 2020. The riverine flow into the estuarine system through the drainage basin of the Ribeira River, which passes through the Valo Grande Channel, follows seasonal rain patterns, with high discharge during the rainy months (mainly in the summer) -with a maximum output of 1751 m 3 s -1 and an annual mean of 773.56 m 3 s -1 (Bérgamo 2000).…”

Section: Introductionmentioning

confidence: 99%

Seasonal arsenic in catfish (Siluriformes, Ariidae) and the hydrochemical conditions of two areas in a Ramsar site on the Brazilian coast

Azevedo

Braga

Kuniyoshi

et al. 2023

An. Acad. Bras. Ciênc.

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The construction of a data bank concerning metal and metalloid content of bioindicator fish from coastal areas is very important as it can help environmental managers in decision making. In natural conditions, the concentration of elements can be influenced by abiotic parameters such as water salinity. In this study, catfish Cathorops spixii were evaluated concerning the total arsenic (As) concentration in the muscle tissues of individuals subjected to different abiotic conditions in the Cananéia-Iguape Estuarine-Lagoon Complex (CIELC), which was recently included on the Ramsar list of wetlands of international importance. Seventy-four catfish were seasonally caught in the northern and southern regions of the CIELC and their hydrochemical parameters were obtained. C. spixii from the southern, best preserved, area showed arsenic concentrations around ten times higher than the maximum limit established for fish intended for human consumption. However, these high concentrations of arsenic could be associated with the abiotic parameters of the water, such as salinity variations, in this area.

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Distribution, Risk Assessment, and Sources of Trace Metals in Surface Sediments from the Sea Area of Macao, South China

Shi

Chen

Gao

et al. 2021

Arch Environ Contam Toxicol

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Organic contaminants and trace metals in the western South Atlantic upper continental margin: Anthropogenic influence on mud depocenters

Cited by 24 publications

References 57 publications

Contribution of chemoautotrophy and heterotrophy to the microbial carbon cycle in the Southwestern Atlantic Ocean

Contribution of chemoautotrophy and heterotrophy to the microbial carbon cycle in the Southwestern Atlantic Ocean

Seasonal arsenic in catfish (Siluriformes, Ariidae) and the hydrochemical conditions of two areas in a Ramsar site on the Brazilian coast

Distribution, Risk Assessment, and Sources of Trace Metals in Surface Sediments from the Sea Area of Macao, South China

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