Flood pulse and spatial dynamics of mercury in sediments in Puruzinho lake, Brazilian Amazon

Almeida, Ronaldo de; Bernardi, José Vicente Elias; Oliveira, Ronaldo Cavalcante; Carvalho, Dirceu Tornavoi de; Manzatto, Ângelo Gilberto; Lacerda, Luiz Drude de; Bastos, Wanderley Rodrigues

doi:10.1590/s0044-59672014000100010

Cited by 25 publications

(19 citation statements)

References 19 publications

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“…Atmospheric deposition maybe an additional source of Hg to the floodplain lakes. A study conducted in sediments from Puruzinho Lake (Madeira River Basin) during wet seasonal period observed THg concentrations ranging from 44 ng g −1 to 129 ng g −1 (Almeida et al ). The authors concluded that the distribution of Hg is mainly controlled by an import of Madeira river water during flooding, while the predominant process in the dry season was the remobilization of THg due to the resuspension of bottom sediments (Almeida et al ).…”

Section: Discussionmentioning

confidence: 99%

Mercury speciation and Hg stable isotope ratios in sediments from Amazon floodplain lakes—Brazil

Araujo

Hintelmann

Dimock

et al. 2017

Limnology & Oceanography

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Hg concentrations and isotope ratios were measured to better characterize the mercury dynamics related to Hg cycling in Amazon floodplain lakes. We collected sediments, suspended particulate material (SPM), and plankton from floodplain lakes and compared then to sediments from rivers and soils of the central Amazon basin by measuring concentrations of total Hg (THg) and methylmercury (MMHg), and mercury isotope ratios. Concentrations of THg and MMHg in the lake sediments ranged to 69–109 ng g−1 and 0.62–4.78 ng g−1, respectively. A positive correlation between THg and MMHg in soils and sediments suggest that inorganic Hg in this system is highly bioavailable and readily converted to MMHg. δ202Hg values ranged from −1.40‰ to −0.89‰ and Δ199Hg from −0.34‰ to −0.18‰. These values were comparable to those measured in riverine sediments (−2.14‰ to −1.23‰ and −0.51‰ to −0.05‰), suggesting a contribution of riverine sediments to lake sediments, at least during the season of rising waters, during which lake samples were collected. SPM on the other hand was much elevated in THg (590–1066 ng g−1) and showed more negative δ202Hg (−3.00 to −2.15), similar to those found in soils (−2.99‰ to −2.17‰), suggesting that Hg in SPM may originate from erosion of floodplain soils.

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Section: Discussionmentioning

confidence: 99%

Mercury speciation and Hg stable isotope ratios in sediments from Amazon floodplain lakes—Brazil

Araujo

Hintelmann

Dimock

et al. 2017

Limnology & Oceanography

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“…They are also a scenario for complex relationships of animals, plants and the environment (Isaac, Fabre, Silva, Ruffino & Saint-Paul, 2012). Effects of these environmental changes include the alteration of habitats, shifts in nutrient cycling patterns, and changes in temperature, oxygen levels, and other limnological variables (Kreibich, 2002;Esteves, 2011a;Almeida et al, 2014;Brito, Alves & Espirito-Santo, 2014). Under the influence of the environmental variation, many organisms, namely ichthyofauna, suffer direct effects of changes in community composition and food availability (Poff et al, 1997;Winemiller & Jepsen, 1998;Saint-Paul et al, 2000;Santos, Ferreira & Amadio, 2008).…”

Section: Acta Of Fisheries and Aquatic Resourcesmentioning

confidence: 99%

“…Contributing to standardize in the hydrological periods delimitation, this study expands the procedure described by Bittencourt & Amadio (2007) and demonstrate how a simple data collection can provide reliable models (see Equations 1 and 2) to identify the seasonal changes in a lake without any hydrometric history (see Tables 3, 4 and 5). We believe this approach can be especially useful for floodplain studies, due the flood pulse social and ecological importance (Poff et al, 1997;Bayley, 1995;Johnson, Richardson & Naimo, 1995;Junk & Wantzen, 2004;Alho, 2008;Lopes & Caliman, 2008;Almeida et al, 2014;Soares, Freitas & Oliveira, 2014) combined with the lack of permanent hydrometric monitoring programs in most of these environments (Ramalho et al, 2005).…”

Section: Acta Of Fisheries and Aquatic Resourcesmentioning

confidence: 99%

“…As these floodplain lakes are subject to structural changes over time, we suspect the depth might not be the best measure for this kind of study. In example, Almeida et al (2014), studying mercury contamination in Puruzinho lake, mentions the transport of this substance through sediments suspension and deposition. Thus, we believe a fixed staff gauge could prevent errors from sediments accumulation and bottom depth changes, generating more accurate results.…”

Section: Acta Of Fisheries and Aquatic Resourcesmentioning

confidence: 99%

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Hydrological seasons fast identification applied to Jaitêua and São Lourenço lakes, Manacapuru, Amazonas State

Barbosa¹,

Soares²

2017

Actapesca

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This paper approaches the application of Hydrological Seasons Fast Identification procedure, proposed by Bittencourt & Amadio (2007), to floodplain lakes with no hydrometric history. For this, we used the correlation between the Solimões river water level, from January 1972 to December 2015, and the Jaitêua and São Lourenço lakes depths, collected from July 2006 to June 2007. Besides the usual results, seasons limits and its intensity and duration classes, we spotted differences between the river and lakes hydrological seasons, a phenomena normally associated with the environments connectivity. Most importantly, we would like to stimulate the debates about arbitraries and the development of better methodological standards for Amazon floodplains seasons identifications.

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“…Nevertheless, studies involving Hg are scarce, especially because of the complex technical requirements of exclusive extraction and the high costs of analyses (Franklin et al, 2012). Some of the noteworthy studies are: Siqueira & Aprile (2012); Hortellani et al, (2013); Almeida et al, (2014); Araujo et al (2015); Remor et al (2015); Rocha et al, (2015); and Sahoo et al (2015).…”

Section: Introductionmentioning

confidence: 99%

Mercury in the Sediment of Pelotas River Basin, Brazil

et al. 2018

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Many studies have determined the concentration of trace elements in river sediments in Brazil. Notwithstanding, mercury assessments are scarce, especially because of exclusive extraction techniques and expensive analysis techniques. Still, this element is known for its toxicity, persistence, and bioaccumulation, making its presence in the environment an important factor for biota and human health. For this reason, the objective of this study was to determine the mercury concentration in the sediment of the Pelotas River basin, located on the border of the states of Santa Catarina and Rio Grande do Sul. The sediment was collected at eight locations of the Pelotas basin and, after drying, the mercury was quantified by atomic absorption spectrometry based on the Zeeman-background correction, coupled to a pyrolysis reactor. The mercury concentrations in the sediments of the Pelotas River varied from 40.5 ng g-1 to 62.0 ng g-1 and presented a positive correlation with the fraction of silt and clay. The concentrations of mercury found in sediments of the Pelotas River basin have a low probability of negatively affecting the biota. Nonetheless, given the persistence and bioaccumulation potential of this element, the aforementioned region needs further studies to quantify the risks it may cause on the local biota and human health.

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Flood pulse and spatial dynamics of mercury in sediments in Puruzinho lake, Brazilian Amazon

Cited by 25 publications

References 19 publications

Mercury speciation and Hg stable isotope ratios in sediments from Amazon floodplain lakes—Brazil

Mercury speciation and Hg stable isotope ratios in sediments from Amazon floodplain lakes—Brazil

Hydrological seasons fast identification applied to Jaitêua and São Lourenço lakes, Manacapuru, Amazonas State

Mercury in the Sediment of Pelotas River Basin, Brazil

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