Anthropogenic and natural variability in the composition of sedimentary organic matter of the urbanised coastal zone of Montevideo (Río de la Plata)

Bueno, Carolina; Brugnoli, Ernesto; Bergamino, Leandro; Muñiz, Pablo; García-Rodríguez, Felipe; Figueira, Rubens César Lopes

doi:10.1016/j.marpolbul.2017.11.009

Cited by 12 publications

(12 citation statements)

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“…Probably, the greater abundance of meiofauna in winter was due to the contribution of total organic matter (MOT), which, as shown in Table 1, presented the highest levels in this period. Organic matter can be obtained with different forms and anthropogenic sources (BUENO et al, 2018), and even changes in sediments as a deposition environment can increase the contribution of MOT (OLIVEIRA et al, 2014;XAVIER et al, 2016). The seasonal rainfall variation influences the distribution of meiofauna organisms: rainfall can enrich the benthic environment with its organic contribution, increasing the availability of food (DALTO; ALBUQUERQUE, 2000; GHOSH; MANDAL; CHATTERJEE, 2018), including driving diffuse pollutants present in effluent networks and rainwater drainage to water bodies (CAMELO, 2019).…”

Section: Hyporheic Meiofaunamentioning

confidence: 99%

Evaluation of freshwater benthic communities: a case study in an urban

Santos

Freitas

Cabral

et al. 2020

Rev. Bras. Ciênc. Ambient. (Online)

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The environmental damage suffered by urban water bodies and the need for public water supply result in a greater interest in techniques that enable water treatment in an efficient and ecological way, such as River Bank Filtration (RBF). This technique uses the soil as a filtering medium, as well as the biological activities of organisms that dwell in the Hyporheic Zone (HZ), the zone of interaction between the surface water body and its underlying aquifer. Knowledge of sediments and hyporheic organisms is indispensable to study RBF. The present paper aimed to characterize the HZ of the middle section of Beberibe river (Pernambuco State, Brazil) in its sedimentological and biological aspects, with sampling druing the rainy and dry seasons, in two distinct sampling sites, one in a conserved area and the other in a highly urbanized area. Biological characterization was performed at the level of large taxonomic groups of meiofauna, accounting for 982 individuals, with the three most abundant taxa being Nematoda, Annelida, and Rotifera. Permutational Analysis of Variance (PERMANOVA) statistical tests were performed, showing significant differences for the season and point factors (p < 0.05) in relation to abundance. The highest concentration of individuals and total organic matter were seen in the rainy season, especially at the point located in the urbanized area. With sedimentological characterization by grain size tests of the hyporheic sediments, the predominance of silt was observed during the rainy season, and sandy during the dry season. It was concluded that the main factor that influenced the structure of the meiofauna community was the release of domestic effluents. The information obtained by the present work helps to understand some features of the HZ, which is essential for RBF or other techniques that use the interstitial matrix.

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Section: Hyporheic Meiofaunamentioning

confidence: 99%

Evaluation of freshwater benthic communities: a case study in an urban

Santos

Freitas

Cabral

et al. 2020

Rev. Bras. Ciênc. Ambient. (Online)

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“…Estas capacidades metodológicas son de gran importancia para las ciencias ambientales, ya que permiten evaluar la evolución histórica de distintos sistemas ambientales en el pasado reciente. Hasta el presente trabajo, en Uruguay, todas las cronologías que utilizaron esta metodología en sistemas sedimentarios fueron realizadas en laboratorios extranjeros, tales como: Laboratorio de Química Inorgánica Marina, Instituto Oceanográfico, Universidad de San Pablo, Brasil (Bueno, et al, 2018), Bremen State Radioactivity Meassurements Laboratory, Alemania (Marrero, et al, 2014), UFZ Centre for Environmental Research, Alemania (García-Rodríguez, et al, 2002).…”

Section: Introductionunclassified

Implementación de la datación mediante 210Pb - 137Cs en Uruguay para el reconocimiento de la variabilidad climático-ambiental del Holoceno superior. Caso de estudio: Laguna de las Nutrias - Rocha - Uruguay

Azcune

Pérez-Parada

Fornaro

2020

INNOTEC

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“…Understanding the processes influencing the sources and fate of OM in estuaries is important for quantifying the contributions of carbon from land and rivers to the global carbon budget of the coastal ocean (Canuel and Hardison, 2016). In this sense, since carbon and nitrogen isotopes (δ 13 C, δ 15 N), as well as the total organic carbon/total nitrogen ratio (TOC/TN, hereafter C/N) of different sources have different values, isotopic data are widely used tools to characterize and discriminate different sources of OM preserved in sediments from coastal marine environments (Lamb et al, 2006;Liu et al, 2015;Pérez et al, 2017;Bueno et al, 2018). δ 13 C values are suitable to distinguish between sources of terrestrial C3 plants characterized by relatively low δ 13 C values (-30 to -24‰) than C4 salt marsh plants (-16 to -12‰), while marine phytoplankton exhibits intermediate δ 13 C values (-22 to -19‰;Fry and Sherr, 1984;Cloern et al, 2002;Wissel and Fry, 2005;Lamb et al, 2006;Bouillon et al, 2008).…”

mentioning

confidence: 99%

“…The interaction between such physical forcing and OM is complex and occurs at different temporal and spatial scales (Goñi et al, 2009;Canuel and Hardison, 2016). In addition, human activities developed on basins and coasts (mainly wastewater discharge) imply additional sources of OM to estuaries and introduce further variability to the natural dynamics (Carpenter et al, 1998;de Jonge et al, 2002;Bueno et al, 2018). The relative importance of this OM drivers and their interaction vary among the estuaries, making difficult to identify universal estuarine trends (Canuel and Hardison, 2016).…”

mentioning

confidence: 99%

“…For this purpose, this work integrates recent and historical carbon and nitrogen isotopes (δ 13 C, δ 15 N), C/N ratios, total organic carbon (TOC), total nitrogen (TN), and sediment grain size analyses along the RdlP estuary. Previous studies on the biochemical composition of sediments within the RdlP (Burone et al, 2013;García-Rodríguez et al, 2014;Venturini et al, 2015;Pérez et al, 2017;Bergamino et al, 2017;Bueno et al, 2018) have been undertaken mainly focusing on the estuarine/marine section or consisted of one single survey. To fill this gap, we investigated temporal and spatial variations using data of three surveys consisting of 25 sediment surface stations located from the freshwater to the marine section of RdlP, plus a sediment core taken from the maximum turbidity zone (MTZ), where the sedimentation processes are dominated by fine sediment fractions.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Spatial and Temporal Variation in the Present and Historical Sedimentary Organic Matter Within the Río De La Plata Estuary (South America) in Relation to the Salinity/Turbidity Gradient / Variação Espacial E Temporal Presente E Histórica Da Matéria Orgânica Sedimentar No Estuário Do Río De La Plata (América Do Sul) Em Relação Ao Gradiente De Salinidade / Turbidez

et al. 2018

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The aim of this study is to examine sedimentary organic matter sources, spatial distribution and temporal variability in a large estuarine system, the Río de la Plata estuary (South America). For this purpose, this work integrates recent and historical carbon and nitrogen isotopes (δ13C, δ15N), total organic carbon, total nitrogen, C/N ratios and sediment grain size analyses along the Río de la Plata estuary. Principal component analysis based on biogeochemical variables and salinity revealed two main biogeochemical contrasting zones, corresponding to the upper and the lower estuary. Such zones are derived from the density gradient observed at the maximum turbidity zone acting as a physical barrier by trapping fine sediments and controlling primary productivity. As a consequence, sedimentary total organic carbon and total nitrogen increase from upper reaches towards lower reaches to attain maximum values under the turbidity gradient due to the presence of fine sediments. On the other hand, C/N ratios display an opposite trend, with higher values in the upper reaches due to a higher influence of continental organic matter. Moreover, Stable Isotope Analysis in R (SIAR) based on δ13C and δ15N reveals that the main organic matter source to the sediment appears to be the continental particulate organic matter and the estimated percentages of terrestrial allochthonous contribution (C3 plants) indicated a decreased contribution towards the lower reaches. The paleoenvironmental analysis shows a change in the sedimentary organic matter composition since 1970 associated to an increased influence of terrestrial organic matter. This trend is related to an increase in the Paraná River flow, which in turn is related to climatic variability (i.e., the polarity change of the Pacific Decadal Oscillation). ResumoO objetivo deste estudo é estimar fontes de matéria orgânica sedimentar, distribuição espacial e variabilidade temporal num grande sistema estuarino, o estuário do Río de la Plata (América do Sul). Este trabalho integra dados atuais e históricos de isótopos de carbono e nitrogênio (δ13C, δ15N), carbono orgânico total, nitrogênio total, relação C/N e granulometria do sedimento ao longo do estuário do Río de la Plata. A análise de componentes principais baseada em variáveis biogeoquímicas e salinidade revelou duas zonas biogeoquímicas contrastantes, correspondentes ao estuário superior e inferior. Tais zonas são definidas por diferenças no gradiente de densidade na zona de turbidez máxima, o qual atua como uma barreira física, causando o aprisionamento de sedimentos finos e influenciando a produtividade primária. Como conseqüência, o carbono orgânico total sedimentar e o nitrogênio total aumentam dos trechos superiores para os trechos inferiores atingindo valores máximos sob o gradiente de turbidez devido à presença de sedimentos finos. Por outro lado, a razão C/N exibe uma tendência oposta, atingindo valores mais elevados no estuário superior devido a uma maior influência da matéria orgânica continental. Os resultados isotópicos de δ13C e δ15N sugerem que a principal fonte de matéria orgânica para o sedimento é a matéria orgânica particulada continental. A contribuição alóctone terrestre (plantas C3) diminui no estuário inferior. A análise paleoambiental mostra uma mudança na composição da matéria orgânica sedimentar a partir de 1970, causada pelo aumento do fornecimento da matéria orgânica terrestre. Essa tendência está relacionada a um aumento no fluxo do Rio Paraná, na sequência de alterações climáticas relacionadas com a mudança de polaridade da Oscilação Decadal do Pacífico.

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Anthropogenic and natural variability in the composition of sedimentary organic matter of the urbanised coastal zone of Montevideo (Río de la Plata)

Cited by 12 publications

References 45 publications

Evaluation of freshwater benthic communities: a case study in an urban

Evaluation of freshwater benthic communities: a case study in an urban

Implementación de la datación mediante 210Pb - 137Cs en Uruguay para el reconocimiento de la variabilidad climático-ambiental del Holoceno superior. Caso de estudio: Laguna de las Nutrias - Rocha - Uruguay

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