Benthic Estuarine Assemblages of the Eastern Marine Brazilian Ecoregion (EME)

Bernardino, Ângelo F.; Reis, Alice; Filho, Antônio Carlos Dórea Pereira; Gomes, L.E. de O.; Bissoli, Lorena B; Barros, Francisco

doi:10.1007/978-3-319-77779-5_4

Cited by 8 publications

(6 citation statements)

References 81 publications

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“…Our study was conducted in the Eastern Marine Ecoregion of Brazil (EME) located within the Tropical Southwestern Atlantic province with low seasonal oscillations in temperature (20-26 C; Bernardino et al 2015;Bernardino et al 2018a). We sampled mangrove soils in three estuaries that are under similar tidal ranges (< 2 m).…”

Section: Methodsmentioning

confidence: 99%

Land use impacts on benthic bioturbation potential and carbon burial in Brazilian mangrove ecosystems

Bernardino

Sanders

Bissoli

et al. 2020

Limnology & Oceanography

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The potential of Blue Carbon as an integral part of global climate change adaptation and mitigation strategies requires quantification of drivers and rates of organic carbon (OC) burial and storage. However, there is limited recognition of how land use impacts benthic assemblages, their bioturbation potential, and OC burial in mangrove forests and tidal flats. Here we evaluated the effects of mangrove deforestation on benthic bioturbation potential (BPc), sediment accretion rates (SARs), and OC and total nitrogen (TN) burial in mangrove soils and tidal flat sediments from three estuaries in tropical Brazil. SARs based on 210 Pb dating varied significantly among undisturbed estuaries (2.1-18.6 mm yr −1) and the OC and TN burial rates were respectively 46% and 16% higher than global averages. The cleared mangrove sites had a twofold lower SAR, 40-fold lower OC burial, and over 100-fold lower TN burial when compared to undisturbed forests, revealing the pervasive impacts of land use. Variation in benthic assemblage structure and BPc among sites suggests that the composition and activity of macrofaunal communities may facilitate OC burial in some cases, yet the global extent and significance of bioturbation requires further study. Our work reveals a strong spatial variability in C burial in undisturbed mangrove forests and a decreased capacity of mangroves to accumulate C and sediments due to land use effects.

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Section: Methodsmentioning

confidence: 99%

Land use impacts on benthic bioturbation potential and carbon burial in Brazilian mangrove ecosystems

Bernardino

Sanders

Bissoli

et al. 2020

Limnology & Oceanography

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“…The Rio Doce estuary (19°38′ to 19°45′ S, 39°45′ to 39°55′ W; Fig. 1), is located on the Eastern Marine Ecoregion of Brazil that has two well-defined seasons, dry winter (April–September) and wet summer (October–March), with an average monthly rainfall of 145 mm and temperatures of 24 to 26 °C (Bernardino et al, 2018; Bissoli & Bernardino, 2018). The Rio Doce estuary has been altered by historical human occupation, but ecosystem health of the estuary was poorly known before the Samarco disaster that occurred in November 2015 (Bernardino et al, 2016; Gomes et al, 2017).…”

Section: Methodsmentioning

confidence: 99%

Chronic trace metals effects of mine tailings on estuarine assemblages revealed by environmental DNA

Bernardino

Pais

Oliveira

et al. 2019

PeerJ

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Mine tailing disasters have occurred worldwide and contemporary release of tailings of large proportions raise concerns of the chronic impacts that trace metals may have on the aquatic biodiversity. Environmental metabarcoding (eDNA) offers an as yet poorly explored opportunity for biological monitoring of impacted aquatic ecosystems from mine tailings and contaminated sediments. eDNA has been increasingly recognized to be an effective method to detect previously unrecognized small-sized Metazoan taxa, but their ecological responses to environmental pollution has not been assessed by metabarcoding. Here, we evaluated chronic effects of trace metal contamination from sediment eDNA of the Rio Doce estuary, 1.7 years after the Samarco mine tailing disaster, which released over 40 million m3 of iron tailings in the Rio Doce river basin. We identified 123 new sequence variants environmental taxonomic units (eOTUs) of benthic taxa and an assemblage composition dominated by Nematoda, Crustacea and Platyhelminthes; typical of other estuarine ecosystems. We detected environmental filtering on the meiofaunal assemblages and multivariate analysis revealed strong influence of Fe contamination, supporting chronic impacts from mine tailing deposition in the estuary. This was in contrast to environmental filtering of meiofaunal assemblages of non-polluted estuaries. Here, we suggest that the eDNA metabarcoding technique provides an opportunity to fill up biodiversity gaps in coastal marine ecology and may become a valid method for long term monitoring studies in mine tailing disasters and estuarine ecosystems with high trace metals content.

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“…The Rio Doce estuary is located in the Eastern Brazilian Marine Ecorregion and is characterized by a humid tropical climate with 2 well-defined seasons, one dry (April to September) and one wet (October to March; Bernardino et al 2015Bernardino et al , 2018. The estuary plays a key subsistence role for the local population and regional fisheries.…”

Section: Study Areamentioning

confidence: 99%

Ecological Risks of Metal and Metalloid Contamination in the Rio Doce Estuary

Gabriel

Silva

Queiroz

et al. 2020

Integr Envir Assess & Manag

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The rupture of a mining dam in southeastern Brazil in 2015 was the country's greatest environmental tragedy. In order to evaluate the ecological risks of the mine tailings on the Rio Doce estuary, this study assessed trace metal contamination and sediment quality indices up to 2.9 y after the dam rupture. Surface sediments were collected from 17 stations on the Rio Doce estuary and Cd, Pb, Cr, Zn, Cu, and As concentrations were determined by inductively coupled plasma atomic emission spectroscopy (ICP‐OES). Four ecological risk indices (modified contamination degree [mCd], pollution load index [PLI], risk index [RI], and sediment quality guideline quotient [SQG‐Q]) suggest a high risk by metal contamination with possible adverse biological effects, with moderate seasonal variability. Based on a precautionary approach, our results support fisheries closures and the need for public health monitoring in the affected areas, and support other studies that suggest chronic metal contamination of the Rio Doce estuary. Integr Environ Assess Manag 2020;16:655–660. © 2020 SETAC

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Benthic Estuarine Assemblages of the Eastern Marine Brazilian Ecoregion (EME)

Cited by 8 publications

References 81 publications

Land use impacts on benthic bioturbation potential and carbon burial in Brazilian mangrove ecosystems

Land use impacts on benthic bioturbation potential and carbon burial in Brazilian mangrove ecosystems

Chronic trace metals effects of mine tailings on estuarine assemblages revealed by environmental DNA

Ecological Risks of Metal and Metalloid Contamination in the Rio Doce Estuary

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