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Journal Article•DOI•

Multidisciplinary approach to assess the water self-depuration characteristics of Suquía River (Córdoba, Argentina)

Carolina Merlo1, Adriana Abril1•
National University of Cordoba1
03 Sep 2014-Revista Chilena de Historia Natural (BioMed Central)-Vol. 87, Iss: 1, pp 1-13
TL;DR: In this article, the authors analyzed the water self-depuration capacity along a polluted river (Suquia River) in Argentina: abundance of microbial metabolic groups, cover and type of vegetation, and type and concentration of soil and sediment humic substances.
Abstract: We analyzed the following characteristics of water self-depuration capacity along a polluted river (Suquia River) in Argentina: (a) abundance of microbial metabolic groups, (b) cover and type of vegetation, and (c) type and concentration of soil and sediment humic substances. The objective was to establish the modifications of water self-depuration characteristics of the polluted sites in comparison to a reference site in order to provide basic data for ecological restoration programs. Five samples of riparian soil, water, and sediments were collected at a reference site and five polluted sites during low- and high-flow water periods. In each site the vegetation type and soil cover were recorded. In all samples the abundance of ammonifiers, nitrate reducers, sulfate reducers, cellulolytic microorganisms, aerobic heterotrophs, and fermenters was measured. Besides, soil and sediment organic matter and humic and fulvic acids content were analyzed. Our results showed that all sites differed in their water self-depuration characteristics with respect to the reference site and that these variations are due to a combination of natural and anthropic factors. The Suquia River presents a great heterogeneity of water self-depuration characteristics but it does not achieve a mitigation of the anthropogenic impact produced by Cordoba city. We concluded that restoration actions in lotic ecosystems should be adapted for each river sector.

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Citations
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Journal Article•DOI•
A multilevel response approach reveals the Asian clam Corbicula largillierti as a mirror of aquatic pollution

[...]

Paola Beatriz Reyna1, Paola Beatriz Reyna2, Maria Laura Ballesteros1, Maria Laura Ballesteros2, M.L. Albá1, Lidwina Bertrand1, Lidwina Bertrand2, María Jesús González González3, Karina S.B. Miglioranza3, Marcos Tatián1, Marcos Tatián2, Andrea Cecilia Hued1, Andrea Cecilia Hued2 •
National University of Cordoba1, National Scientific and Technical Research Council2, Spanish National Research Council3
15 Jul 2019-Science of The Total Environment
TL;DR: The results showed the presence of contaminants along the studied river and the ability of C. largillierti to bioaccumulate them, and suggest this species as an useful bioindicator of aquatic pollution.

15 citations

Journal Article•DOI•
Chemical and spectroscopic characterization of humic substances from sediment and riparian soil of a highly polluted urban river (Suquía River, Córdoba, Argentina)

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Carolina Merlo1, Carolina Merlo2, Carolina Vázquez2, Ana G. Iriarte2, Carlos M. Romero3, Carlos M. Romero4 •
National Scientific and Technical Research Council1, National University of Cordoba2, University of Lethbridge3, Agriculture and Agri-Food Canada4
01 Jun 2020-International Journal of Sediment Research
TL;DR: In this paper, organic matter dynamics and humic substances (HS) spectrochemical properties along the lower-middle basin of the Suquia River were investigated. But the results were limited to a small portion of the river basin.

14 citations

References
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Journal Article•DOI•
Denitrification Potential, Root Biomass, and Organic Matter in Degraded and Restored Urban Riparian Zones

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Danielle M. Gift1, Peter M. Groffman2, Sujay S. Kaushal3, Paul M. Mayer4•
Northern Arizona University1, Institute of Ecosystem Studies2, University of Maryland Center for Environmental Science3, United States Environmental Protection Agency4
01 Jan 2010-Restoration Ecology
TL;DR: In this article, root biomass, soil organic matter, and denitrification potential (anaerobic slurry assay) at four depths in duplicate degraded, restored, and reference riparian zones in the Baltimore, Maryland, U.S.A., metropolitan area were evaluated.
Abstract: Hydrologic changes associated with urbanization often lead to lower water tables and drier, more aerobic soils in riparian zones. These changes reduce the potential for denitrification, an anaerobic microbial process that converts nitrate, a common water pollutant, into nitrogen gas. In addition to oxygen, denitrification is controlled by soil organic matter and nitrate. Geomorphic stream restorations are common in urban areas, but their effects on riparian soil conditions and denitrification have not been evaluated. We measured root biomass, soil organic matter, and denitrification potential (anaerobic slurry assay) at four depths in duplicate degraded, restored, and reference riparian zones in the Baltimore, Maryland, U.S.A., metropolitan area. There were three main findings in this study. First, although reference sites were wet and had high soil organic matter, they had low levels of nitrate relative to degraded and restored sites and therefore there were few differences in denitrification potential among sites. Evaluations of riparian restorations that have nitrate removal by denitrification as a goal should consider the complex controls of this process and how they vary between sites. Second, all variables declined markedly with depth in the soil. Restorations that increase riparian water tables will thus foster interaction of groundwater nitrate with near-surface soils with higher denitrification potential. Third, we observed strong positive relationships between root biomass and soil organic matter and between soil organic matter and denitrification potential, which suggest that establishment of deep-rooted vegetation may be particularly important for increasing the depth of the active denitrification zone in restored riparian zones.

105 citations

"Multidisciplinary approach to asses..." refers background in this paper

  • ...Most importantly, though, root plants are known to provide a source of available C to microorganisms (Gift et al. 2010)....

    [...]

  • ...…compounds, removing C, N, and S from ecosys- is an Open Access article distributed under the terms of the Creative Commons g/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction roperly credited. tems (Leonov and Chicherina 2008; Groffman et al. 2009; Gift et al. 2010)....

    [...]

  • ...…nitrate contamination that supports aquatic ecosystems and particularly Suquía River (Reyna et al. 2010; Merlo et al. 2011), nitrate-reducer communities have been studied in diverse environments for their capacity to remove this nutrient from ecosystems (Perryman et al. 2008; Gift et al. 2010)....

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  • ...The aim of ecological restoration programs is to improve water quality, enhance in-stream habitat, and manage the riparian zone (Parkyn et al. 2003; Kang and Lin 2009; Gift et al. 2010)....

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  • ...2011), nitrate-reducer communities have been studied in diverse environments for their capacity to remove this nutrient from ecosystems (Perryman et al. 2008; Gift et al. 2010)....

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Journal Article•DOI•
Modeling the effects of riparian buffer zone and contour strips on stream water quality

[...]

Mahesh Sahu1, Roy R. Gu1, Roy R. Gu2•
Iowa State University1, South China University of Technology2
01 Aug 2009-Ecological Engineering
TL;DR: In this article, the effectiveness of contour and riparian buffer strips in reducing NO3-N outflows from crop fields to the river was evaluated using the Soil and Water Assessment Tool (SWAT).

103 citations

"Multidisciplinary approach to asses..." refers background in this paper

  • ...It is well known that toph soils do not allow the vegetation to grow and the highest water speed prevents OM deposition, eliminating the possibility of nutrients uptake and retention of xenobiotics (Parkyn et al. 2003; McIntyre et al. 2009; Sahu and Gu 2009)....

    [...]

Journal Article•DOI•
Occurrence of toxic cyanobacterial blooms in San Roque Reservoir (Córdoba, Argentina): A field and chemometric study

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María Valeria Amé1, María del Pilar Díaz1, Daniel Alberto Wunderlin1•
National University of Cordoba1
01 Jan 2003-Environmental Toxicology
TL;DR: It is suggested that guidelines for safe water consumption and recreational use should be established for this reservoir, and certain environmental factors that could lead to the dominance of toxic strains are identified, thus increasing the amount of microcystin.
Abstract: We evaluated the presence of cyanobacterial blooms in San Roque Reservoir (Cordoba, Argentina). Cyanobacterial blooms and water samples were collected over 4 years (1998 -2002). We confirmed the presence of microcystin-LR and microcystin-RR in 97% of these blooms. The total amount of microcystin (MC) ranged between 5.8 and 2400.0 gg 1 of freeze-dried bloom material. These values suggest that guidelines for safe water consumption and recreational use should be established for this reservoir. Twenty-eight physical and chemical parameters were measured in water samples and evaluated by discriminant analysis (DA). A first DA was used to evaluate the factors promoting cyanobacteria occurrence, identifying nine parameters following three patterns associated with cyanobacterial growth. Inorganic phosphorous was found to promote the presence of blooms, whereas the highest proliferation of cyanobacteria was observed in the presence of smaller amounts of carbonate, bicarbonate, sulfate, and fecal coliform bacteria. The results observed during our fieldwork, analyzed using DA, agreed with the results of other laboratory studies, thus confirming the usefulness of DA to help with the evaluation of a complicated environmental data matrix. A second DA, using only water samples collected during the presence of cyanobacteria blooms, identified another nine parameters. The analysis of these parameters allowed us to identify certain environmental factors that could lead to the dominance of toxic strains, thus increasing the amount of MC. The results showed that, in our case, an increase in the water temperature was associated with higher amounts of MC per dry weight unit, whereas an increase in the concentrations of ammonia-nitrogen and iron were associated with lower amounts of MC, thus disfavoring the domi- nance of toxic strains. © 2003 Wiley Periodicals, Inc. Environ Toxicol 18: 192-201, 2003.

97 citations

"Multidisciplinary approach to asses..." refers background in this paper

  • ...The Suquía River does not receive much litter from riparian vegetation; therefore, most allochthonous OM comes from San Roque Dam in which the water is highly eutrophicated with an elevated algal density (Amé et al. 2003)....

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Journal Article•DOI•
Phylogeography of Sulfate-Reducing Bacteria among Disturbed Sediments, Disclosed by Analysis of the Dissimilatory Sulfite Reductase Genes (dsrAB)

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J. R. Pérez-Jiménez, Lee J. Kerkhof1•
Rutgers University1
01 Feb 2005-Applied and Environmental Microbiology
TL;DR: Data demonstrate that SRB populations do not adhere to a biogeographic distribution pattern similar to that of larger eukaryotic organisms, with the greatest species diversity radiating from the Indo-Pacific region.
Abstract: Sediment samples were collected worldwide from 16 locations on four continents (in New York, California, New Jersey, Virginia, Puerto Rico, Venezuela, Italy, Latvia, and South Korea) to assess the extent of the diversity and the distribution patterns of sulfate-reducing bacteria (SRB) in contaminated sediments. The SRB communities were examined by terminal restriction fragment (TRF) length polymorphism (TRFLP) analysis of the dissimilatory sulfite reductase genes (dsrAB) with NdeII digests. The fingerprints of dsrAB genes contained a total of 369 fluorescent TRFs, of which <20% were present in the GenBank database. The global sulfidogenic communities appeared to be significantly different among the anthropogenically impacted (petroleum-contaminated) sites, but nearly all were less diverse than pristine habitats, such as mangroves. A global SRB indicator species of petroleum pollution was not identified. However, several dsrAB gene sequences corresponding to hydrocarbon-degrading isolates or consortium members were detected in geographically widely separated polluted sites. Finally, a cluster analysis of the TRFLP fingerprints indicated that many SRB microbial communities were most similar on the basis of close geographic proximity (tens of kilometers). Yet, on larger scales (hundreds to thousands of kilometers) SRB communities could cluster with geographically widely separated sites and not necessarily with the site with the closest proximity. These data demonstrate that SRB populations do not adhere to a biogeographic distribution pattern similar to that of larger eukaryotic organisms, with the greatest species diversity radiating from the Indo-Pacific region. Rather, a patchy SRB distribution is encountered, implying an initially uniform SRB community that has differentiated over time.

92 citations

"Multidisciplinary approach to asses..." refers background in this paper

  • ...However, although sulfate reducers are less abundant in freshwater, numerous authors agree that sulfate reducers’ activity has a key role not only in C and S cycles but also in anaerobic degradation of organic contaminants in polluted ecosystems (Dhillon et al. 2003; Pérez-Jiménez and Kerkhof 2005; Leonov and Chicherina 2008)....

    [...]

  • ...…are less abundant in freshwater, numerous authors agree that sulfate reducers’ activity has a key role not only in C and S cycles but also in anaerobic degradation of organic contaminants in polluted ecosystems (Dhillon et al. 2003; Pérez-Jiménez and Kerkhof 2005; Leonov and Chicherina 2008)....

    [...]

Journal Article•DOI•
Biodelignification and humification of horticultural plant residues by fungi

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María J. López1, M.C. Vargas-García1, Francisca Suárez-Estrella1, Joaquín Moreno1•
University of Almería1
01 Jan 2006-International Biodeterioration & Biodegradation
TL;DR: In this article, the degradation of lignin in mixtures of horticultural plant residues with different C/N ratios by lignocellulolytic fungi was evaluated.

75 citations

"Multidisciplinary approach to asses..." refers background in this paper

  • ...From soil science perspective, it is known that the degradation rate of these complex molecules under water-saturated conditions (anaerobic) is low, which favors the synthesis of humic substances (Wetzel 2001; Lopez et al. 2006)....

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