Multidisciplinary approach to assess the water self-depuration characteristics of Suquía River (Córdoba, Argentina)
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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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
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
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03 Feb 1983
12,173 citations
14 Feb 1996
8,749 citations
"Multidisciplinary approach to asses..." refers methods in this paper
...For each riparian soil and sediment sample, we measured total organic matter (OM) by the wet method of Walkley and Black (Nelson and Sommers 1996) and the humic substances content (HS) by alkali extraction (NaOH)....
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...Wiley-Blackwell, New Jersey Calace N, Deriu D, Petronio BM, Pietroletti M (2009) Adsorption isotherms and breakthrough curves to study how humic acids influence heavy metal-soil interactions....
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Book•
01 Jan 1975
TL;DR: The Ontogeny of Inland Aquatic Ecosystmes: Understanding is Essential for the Future References Appendix Index as discussed by the authors The ontogeny is essential for the future.
Abstract: Preface 1 Prologue 2 Water as a Substance 3 Rivers and Lakes - Their Distribution, Origins, and Forms 4 Water Economy 5 Light in Inland Waters 6 Fate of Heat 7 Water Movements 8 Structure and Productivity of Aquatic Ecosystems 9 Oxygen 10 Salinity of Inland Waters 11 The Inorganic Carbon Complex 12 The Nitrogen Cycle 13 The Phosphorus Cycle 14 Iron, Sulfer, and Silica Cycles 15 Planktonic Communities: Algae and Cyanobacteria 16 Plantonic Communities: Zooplankton and their Interactions with Fish 17 Bacterioplankton 18 Land-Water Interfaces: Larger Plants 19 Land-Water Interfaces: Attached Microorganisms, Littoral Algae, and Zooplankton 20 Shallow Lakes and Ponds 21 Sediments and Microflora 22 Benthic Animals and Fish Communities 23 Detrirus: Organic Carbon Cycling and Ecosystem Metabolism 24 Past Productivity: Paleolimnology 25 The Ontogeny of Inland Aquatic Ecosystmes 26 Inland waters: Understanding is Essential for the Future References Appendix Index
5,172 citations
"Multidisciplinary approach to asses..." refers background or result in this paper
...By contrast, the low abundance of nitrate-reducer in Suquía River has been observed by Reyna et al. (2010), suggesting a strong competition with plants, algae, and other microorganisms for nitrate (Wetzel 2001)....
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...(2010), suggesting a strong competition with plants, algae, and other microorganisms for nitrate (Wetzel 2001)....
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...The ecology of riparian vegetation is substantial for water self-depuration due to their great capacity to take up nutrients, thus avoiding eutrophication of the aquatic ecosystem (Wetzel 2001; Barton and Northup 2011)....
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...The increases of sediment and soil OM fractions at RS in high-flow period would reflect major deposition and retention due to the high OM residues transported by water in this period (Wetzel 2001)....
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...The dynamics of microbial metabolic groups at RS agree with numerous studies which indicate that part of the degradation is carried out quickly in the water by aerobic microorganisms and the other in soil and sediment with a predominance of anaerobic bacteria (Wetzel 2001; Dzyuban 2003; Dzyuban 2005; Amalfitano et al. 2008)....
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Book•
01 Jan 1995
TL;DR: Quality Control and Quality Assurance in Applied Soil Microbiology and Biochemistry in applied soil microbiology and biochemistry and field methods.
Abstract: (Chapter Headings): Introduction. Quality Control and Quality Assurance in Applied Soil Microbiology and Biochemistry. Soil Sampling, Handling, Storage, And Analysis. Enrichment, Isolation and Counting of Soil Microorganisms. Estimation of Microbial Activities. Anaerobic Microbial Activities in Soil. Enzyme Activities. Micorbial Biomass. Community Structure. Field Methods. Bioremediation of Soil. Subject Index.
2,125 citations
TL;DR: An understanding of the molecular mechanism leading to biodegradation of lignocelluloses and the development of the bioprocessing potential of cellulolytic microorganisms might effectively be accomplished with recombinant DNA technology.
Abstract: In view of rising prices of crude oil due to increasing fuel demands, the need for alternative sources of bioenergy is expected to increase sharply in the coming years. Among potential alternative bioenergy resources, lignocellulosics have been identified as the prime source of biofuels and other value-added products. Lignocelluloses as agricultural, industrial and forest residuals account for the majority of the total biomass present in the world. To initiate the production of industrially important products from cellulosic biomass, bioconversion of the cellulosic components into fermentable sugars is necessary. A variety of microorganisms including bacteria and fungi may have the ability to degrade the cellulosic biomass to glucose monomers. Bacterial cellulases exist as discrete multi-enzyme complexes, called cellulosomes that consist of multiple subunits. Cellulolytic enzyme systems from the filamentous fungi, especially Trichoderma reesei, contain two exoglucanases or cellobiohydrolases (CBH1 and CBH2), at least four endoglucanases (EG1, EG2, EG3, EG5), and one β-glucosidase. These enzymes act synergistically to catalyse the hydrolysis of cellulose. Different physical parameters such as pH, temperature, adsorption, chemical factors like nitrogen, phosphorus, presence of phenolic compounds and other inhibitors can critically influence the bioconversion of lignocellulose. The production of cellulases by microbial cells is governed by genetic and biochemical controls including induction, catabolite repression, or end product inhibition. Several efforts have been made to increase the production of cellulases through strain improvement by mutagenesis. Various physical and chemical methods have been used to develop bacterial and fungal strains producing higher amounts of cellulase, all with limited success. Cellulosic bioconversion is a complex process and requires the synergistic action of the three enzymatic components consisting of endoglucanases, exoglucanases and β-glucosidases. The co-cultivation of microbes in fermentation can increase the quantity of the desirable components of the cellulase complex. An understanding of the molecular mechanism leading to biodegradation of lignocelluloses and the development of the bioprocessing potential of cellulolytic microorganisms might effectively be accomplished with recombinant DNA technology. For instance, cloning and sequencing of the various cellulolytic genes could economize the cellulase production process. Apart from that, metabolic engineering and genomics approaches have great potential for enhancing our understanding of the molecular mechanism of bioconversion of lignocelluloses to value added economically significant products in the future.
1,094 citations