scholarly journals The role of macroinvertebrates for conservation of freshwater systems

2017 ◽  
Vol 7 (14) ◽  
pp. 5502-5513 ◽  
Author(s):  
Carolina Nieto ◽  
Ximena M.C. Ovando ◽  
Rafael Loyola ◽  
Andrea Izquierdo ◽  
Fátima Romero ◽  
...  
Keyword(s):  
Freshwater Systems

Role of Settling Particles on Mercury Methylation in the Oxic Water Column of Freshwater Systems

2016 ◽  
Vol 50 (21) ◽  
pp. 11672-11679 ◽  
Author(s):  
Elena Gascón Díez ◽  
Jean-Luc Loizeau ◽  
Claudia Cosio ◽  
Sylvain Bouchet ◽  
Thierry Adatte ◽  
...  
Keyword(s):  
Water Column ◽  
Mercury Methylation ◽  
Freshwater Systems ◽  
Settling Particles

scholarly journals Role of Methanogens and Other Bacteria in Degradation of Dimethyl Sulfide and Methanethiol in Anoxic Freshwater Sediments

1999 ◽  
Vol 65 (5) ◽  
pp. 2116-2121 ◽  
Author(s):  
Bart P. Lomans ◽  
Huub J. M. Op den Camp ◽  
Arjan Pol ◽  
Chris van der Drift ◽  
Godfried D. Vogels
Keyword(s):  
Hydrogen Transfer ◽  
Dimethyl Sulfide ◽  
Methanogenic Bacteria ◽  
Freshwater Sediments ◽  
Freshwater Systems ◽  
Sulfate Reducing ◽  
Degradation Rates ◽  
Reducing Bacteria ◽  
Nitrate Reducing Bacteria

ABSTRACT The roles of several trophic groups of organisms (methanogens and sulfate- and nitrate-reducing bacteria) in the microbial degradation of methanethiol (MT) and dimethyl sulfide (DMS) were studied in freshwater sediments. The incubation of DMS- and MT-amended slurries revealed that methanogens are the dominant DMS and MT utilizers in sulfate-poor freshwater systems. In sediment slurries, which were depleted of sulfate, 75 μmol of DMS was stoichiometrically converted into 112 μmol of methane. The addition of methanol or MT to DMS-degrading slurries at concentrations similar to that of DMS reduced DMS degradation rates. This indicates that the methanogens in freshwater sediments, which degrade DMS, are also consumers of methanol and MT. To verify whether a competition between sulfate-reducing and methanogenic bacteria for DMS or MT takes place in sulfate-rich freshwater systems, the effects of sulfate and inhibitors, like bromoethanesulfonic acid, molybdate, and tungstate, on the degradation of MT and DMS were studied. The results for these sulfate-rich and sulfate-amended slurry incubations clearly demonstrated that besides methanogens, sulfate-reducing bacteria take part in MT and DMS degradation in freshwater sediments, provided that sulfate is available. The possible involvement of an interspecies hydrogen transfer in these processes is discussed. In general, our study provides evidence for methanogenesis as a major sink for MT and DMS in freshwater sediments.

Living within dynamic social-ecological freshwater systems: System parameters and the role of ecological engineering

2011 ◽  
Vol 37 (11) ◽  
pp. 1661-1672 ◽  
Author(s):  
Eric D. Roy ◽  
Jay F. Martin ◽  
Elena G. Irwin ◽  
Joseph D. Conroy ◽  
David A. Culver
Keyword(s):  
Ecological Engineering ◽  
Freshwater Systems ◽  
System Parameters ◽  
Social Ecological

scholarly journals The emerging role of pharmacology in understanding consumer–prey interactions in marine and freshwater systems

2009 ◽  
Vol 49 (3) ◽  
pp. 291-313 ◽  
Author(s):  
Erik E. Sotka ◽  
Jennifer Forbey ◽  
Michael Horn ◽  
Alistair G. B. Poore ◽  
David Raubenheimer ◽  
...  
Keyword(s):  
Freshwater Systems

scholarly journals The Ecosystem Resilience Concept Applied to Hydrogeological Systems: A General Approach

Water ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1824 ◽  
Author(s):  
África de la Hera-Portillo ◽  
Julio López-Gutiérrez ◽  
Pedro Zorrilla-Miras ◽  
Beatriz Mayor ◽  
Elena López-Gunn
Keyword(s):  
Climate Change ◽  
Ecosystem Resilience ◽  
Freshwater Systems ◽  
Delayed Effects ◽  
Basic Concepts ◽  
Groundwater Quantity ◽  
Hydrogeological Systems

We have witnessed the great changes that hydrogeological systems are facing in the last decades: rivers that have dried up; wetlands that have disappeared, leaving their buckets converted into farmland; and aquifers that have been intensively exploited for years, among others. Humans have caused the most part of these results that can be worsened by climate change, with delayed effects on groundwater quantity and quality. The consequences are negatively impacting ecosystems and dependent societies. The concept of resilience has not been extensively used in the hydrogeological research, and it can be a very useful concept that can improve the understanding and management of these systems. The aim of this work is to briefly discuss the role of resilience in the context of freshwater systems affected by either climate or anthropic actions as a way to increase our understanding of how anticipating negative changes (transitions) may contribute to improving the management of the system and preserving the services that it provides. First, the article presents the basic concepts applied to hydrogeological systems from the ecosystem’s resilience approach. Second, the factors controlling for hydrogeological systems’ responses to different impacts are commented upon. Third, a case study is analyzed and discussed. Finally, the useful implications of the concept are discussed.

scholarly journals Correction to Role of Settling Particles on Mercury Methylation in the Oxic Water Column of Freshwater Systems

2017 ◽  
Vol 51 (6) ◽  
pp. 3594-3594
Author(s):  
Elena Gascón Díez ◽  
Jean-Luc Loizeau ◽  
Claudia Cosio ◽  
Sylvain Bouchet ◽  
Thierry Adatte ◽  
...  
Keyword(s):  
Water Column ◽  
Mercury Methylation ◽  
Freshwater Systems ◽  
Settling Particles

Microbially influenced corrosion of steels by Pseudomonas aeruginosa

2014 ◽  
Vol 32 (3-4) ◽  
pp. 129-141 ◽  
Author(s):  
Ahmad Abdolahi ◽  
Esah Hamzah ◽  
Zaharah Ibrahim ◽  
Shahrir Hashim
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Marine Environment ◽  
Metabolic Activity ◽  
Steel Structures ◽  
Gas Oil ◽  
Freshwater Systems ◽  
Microbially Influenced Corrosion ◽  
Oil Pipelines

AbstractMicrobially influenced corrosion (MIC) is a destructive type of corrosion that is initiated, facilitated, or accelerated by the presence and metabolic activity of bacteria. MIC of steels is a great issue in many industries such as marine, freshwater systems, and gas/oil pipelines. Pseudomonas aeruginosa is one of the aerobic slime-forming bacteria that are ubiquitous in marine environment that corrode steel structures. This article aims to provide a review on MIC of steels caused by bacteria, mostly in the case of P. aeruginosa. The mechanisms of MIC will be discussed based on bacteria-metal reactions and emphasize the role of P. aeruginosa on corrosion of steels.

An investigation of the role of organic materials in freshwater systems

1975 ◽  
Vol 19 (3) ◽  
pp. 2201-2206
Author(s):  
James E. Schindler ◽  
James J. Alberts
Keyword(s):  
Organic Materials ◽  
Freshwater Systems

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor
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