Biogeochemical factors controlling arsenic distribution in a densely populated tropical estuary (Guanabara Bay, RJ, Brazil)

Cordeiro, Renato Campello; Santelli, Ricardo Erthal; Machado, Wilson; Moreira, Luciane Silva; Freire, Andrea S.; Braz, Bernardo Ferreira; Ansari, Nafisa Rizzini; Bidone, Edison Dausacker; Meniconi, M. F. G.

doi:10.1007/s12665-017-6888-y

Cited by 15 publications

(6 citation statements)

References 60 publications

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“…Carreira et al (2002) analyzed the isotopic signature of sedimentary organic carbon at a station located very close to this mangrove and concluded that the riverine/terrestrial inputs accounted for around 70% of total sedimentary organic matter. However, as also recently pointed out by Cordeiro et al (2017), these less 13 C-enriched sediments were restricted to the area very close to the mangrove forest. Little export of mangrove material apparently occurs probably because of low tidal pumping related to the microtidal character of the bay.…”

Section: Phytoplanktonic Origin Of Doc In Guanabara Baysupporting

confidence: 77%

“…Using a two end-member isotopic mixing model, these authors found a predominance of 75% and 82% of phytoplanktonic source to the sedimentary organic carbon in the sectors 3 and 5 (d 13 C -19.9% to -23.7%), a percentage very similar to what we found in POC at the same locations. A recent study showed that d 13 C values in surface sediments of Guanabara Bay ranged between -26.2 and -20.5%, with more enrichment of 13 C in mid-upper sectors, and less enrichment in the locations near the mangrove and under influence of riverine discharges (Cordeiro et al 2017). An unknown fraction of this sedimentary POC can be respired and return to water column as DIC.…”

Section: The Cycling Of Carbon In Guanabara Bay Driven By Phytoplanktonmentioning

confidence: 99%

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Predominance of phytoplankton-derived dissolved and particulate organic carbon in a highly eutrophic tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)

et al. 2017

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We investigate the carbon dynamics in Guanabara Bay, an eutrophic tropical coastal embayment surrounded by the megacity of Rio de Janeiro (southeast coast of Brazil). Nine sampling campaigns were conducted for dissolved, particulate and total organic carbon (DOC, POC and TOC), dissolved inorganic carbon (DIC), partial pressure of CO 2 (pCO 2 ), chlorophyll a (Chl a), pheo-pigments and ancillary parameters. Highest DOC, POC and Chl a concentrations were found in confined-shallow regions of the bay during the summer period with strong pCO 2 undersaturation, and DOC reached 82 mg L -1 , POC 152 mg L -1 , and Chl a 800 lg L -1 . Spatially and temporally, POC and DOC concentrations varied positively with total pigments, and negatively with DIC. Strong linear correlations between these parameters indicate that the production of TOC translates to an equivalent uptake in DIC, with 85% of the POC and about 50% of the DOC being of phytoplanktonic origin. Despite the shallow depths of the bay, surface waters were enriched in POC and DOC relative to bottom waters in periods of high thermohaline stratification. The seasonal accumulation of phytoplankton-derived TOC in the surface waters reached about 105 g C m -2 year -1 , representing between 8 and 40% of the net primary production. The calculated turnover time of organic carbon was 117 and 34 days during winter and summer, respectively. Our results indicate that eutrophication of coastal bays in the tropics can generate large stocks of planktonic biomass and detrital organic carbon which are permanently being produced and partially degraded and buried in sediments.

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Section: Phytoplanktonic Origin Of Doc In Guanabara Baysupporting

confidence: 77%

Section: The Cycling Of Carbon In Guanabara Bay Driven By Phytoplanktonmentioning

confidence: 99%

Predominance of phytoplankton-derived dissolved and particulate organic carbon in a highly eutrophic tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)

et al. 2017

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“…The sediment core was sliced into 1-cm sections which were stored in plastic bags. Geochemical characterization of the sediments was performed as described previously [14,15,48]. The bulk density of each layer was obtained by removing 8 cm 3 of a wet sediment section and drying it at 60 °C to the constant weight.…”

Section: Sediment Core and Geochemical Analysismentioning

confidence: 99%

“…These extremely high C:N ratios are characteristic of the organic matter from the Podzols of the Negro River basin that give the river its black color [2]. δ 15 N showed significant changes between surface (1.90‰) and depth (0.07‰), indicating a relatively higher autochthonous productivity, since less organic matter came from the river, and perhaps a more active recycling of nitrogen at the time of deposition of the upper 24 cm of sediment [22,47], and total nitrogen had an opposite trend (surface: 1.10%,depth: 0.03% (Table S1; Fig. 1).…”

Section: Airo Sedimentological and Geochemical Featuresmentioning

confidence: 99%

Diversity of Microbiomes Across a 13,000-Year-Old Amazon Sediment

et al. 2023

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The microbiome is fundamental for understanding bacterial activities in sediments. However, only a limited number of studies have addressed the microbial diversity of Amazonian sediments. Here, we studied the microbiome of sediments from a 13,000-year BP core retrieved in a floodplain lake in Amazonia using metagenomics and biogeochemistry. Our aim was to evaluate the possible environmental influence over a river to a lake transition using a core sample. To this end, we sampled a core in the Airo Lake, a floodplain lake in the Negro River basin. The Negro River is the largest tributary of the Amazon River. The obtained core was divided into three strata: (i) surface, almost complete separation of the Airo Lake from the Negro River when the environment becomes more lentic with greater deposition of organic matter (black-colored sediment); (ii) transitional environment (reddish brown); and (iii) deep, environment with a tendency for greater past influence of the Negro River (brown color). The deepest sample possibly had the greatest influence of the Negro River as it represented the bottom of this river in the past, while the surface sample is the current Airo Lake bottom. In total, six metagenomes were obtained from the three different depth strata (total number of reads: 10.560.701; sequence length: 538 ± 24, mean ± standard deviation). The older (deeper) sediment strata contained a higher abundance of Burkholderia, Chitinophaga, Mucilaginibacter, and Geobacter, which represented ~ 25% of the metagenomic sequences. On the other hand, the more recent sediment strata had mainly Thermococcus, Termophilum, Sulfolobus, Archaeoglobus, and Methanosarcina (in total 11% of the metagenomic sequences). The sequence data were binned into metagenome-assembled genomes (MAGs). The majority of the obtained MAGs (n = 16) corresponded to unknown taxa, suggesting they may belong to new species. The older strata sediment microbiome was enriched with sulfur cycle genes, TCA cycle, YgfZ, and ATP-dependent proteolysis in bacteria. Meanwhile, serine-glyoxylate cycle, stress response genes, bacterial cell division, cell division-ribosomal stress protein cluster, and oxidative stress increased in the younger strata. Metal resistance and antimicrobial resistance genes were found across the entire core, including genes coding for fluoroquinolones, polymyxin, vancomycin, and multidrug resistance transporters. These findings depict the possible microbial diversity during the depositional past events and provided clues of the past microbial metabolism throughout time.

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“…This pollution has always been associated in the coastal environment with the visual aspect that inhibits tourist activities. Only from last decade this type of pollution has been studied more intensively (Baptista Neto & Fonseca, 2011;Farias, 2014;Carvalho & Baptista Neto, 2016;Bernardino & Franz, 2016;Cordeiro et al, 2017;Figueiredo & Vianna, 2018;Olivatto et al, 2019;Alves & Figueiredo, 2019).…”

Section: Introductionmentioning

confidence: 99%

The Use of Sidescan Sonar to Detect Large Benthic Marine Debris in Niterói Harbor-Guanabara Bay/SE Brazil

et al. 2021

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Abstract. Marine debris constitute a global concern that pollutes the world’s oceans, including deep benthic habitats where little is known about the extent of the problem. SideScan Sonar systems are able to provide near-photographic high-resolution images of underwater areas, for a wide variety of objectives, including production of nautical charts and detection of underwater bathymetric features. Lately this technology has been used as a tool to detect debris on the seafloor that may be hazardous for living organisms and finally for humans. Harbor activities were the most common contributors of benthic debris. Little is known about the extent of the problem in the Guanabara Bay, Rio de Janeiro, regarding benthic debris distribution and their influence in the bottom sediment. The present study analyzes the spatial distribution and type of marine benthic debris in the area of Niterói Harbour. The study identified great amount of benthic debris, including tires, anchors, cables or linear features, sunken vessels, wooden or metal bars and pillars.Keywords: anthropogenic marine debris; benthic habitats, marine debris, estuarine pollution, Guanabara Bay O uso de sonar de varredura lateral para detectar grandes detritos marinhos bentônicos no Porto de Niterói - Baía de Guanabara/SE BrasilResumo. Os detritos marinhos são uma preocupação global que poluem os oceanos do mundo, incluindo habitats bentônicos profundos, onde pouco se sabe sobre a extensão do problema. O sistema de sonar de varredura lateral é capaz de fornecer imagens quase fotográficas de alta resolução de áreas subaquáticas, para uma ampla variedade de objetivos, incluindo a produção de cartas náuticas e detecção de características batimétricas subaquáticas. Ultimamente, essa tecnologia tem sido usada como uma ferramenta para detectar detritos no fundo do mar que podem ser perigosos para os organismos marinhos vivos e, finalmente, para os humanos. As atividades portuárias foram as que mais contribuíram para os detritos bentônicos. Pouco se sabe sobre a extensão do problema na Baía de Guanabara em relação à distribuição de detritos bentônicos e sua influência no sedimento de fundo. O presente estudo analisa a distribuição espacial e o tipo de detritos bentônicos marinhos na área do Porto de Niterói. Na área estudada foi observada grande quantidade de detritos bentônicos, incluindo: pneus, âncoras, cabos ou feições lineares, embarcações afundadas, barras e pilares de madeira ou metal.Palavras-chave: detritos marinhos antropogênicos; habitats bentônicos, detritos marinhos, poluição estuarina, Baía de Guanabara

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Biogeochemical factors controlling arsenic distribution in a densely populated tropical estuary (Guanabara Bay, RJ, Brazil)

Cited by 15 publications

References 60 publications

Predominance of phytoplankton-derived dissolved and particulate organic carbon in a highly eutrophic tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)

Predominance of phytoplankton-derived dissolved and particulate organic carbon in a highly eutrophic tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)

Diversity of Microbiomes Across a 13,000-Year-Old Amazon Sediment

The Use of Sidescan Sonar to Detect Large Benthic Marine Debris in Niterói Harbor-Guanabara Bay/SE Brazil

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