aquatic biology Articles
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Progress on water data integration and distribution: a summary of select US Geological Survey data systems
Critical water-resources issues ranging from flood response to water scarcity make access to integrated water information, services, tools, and models essential. Since 1995 when the first water data web pages went online, the US Geological Survey has been at the forefront of water data distribution and integration. Today, real-time and historical streamflow observations are available via web ...
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In-Situ® Rugged Dissolved Oxygen (RDO®) Sensors Use the Latest Advancements in Optical Measurement Technology
Dissolved oxygen (DO) is one of the most important parameters monitored when evaluating water quality, aquatic biology, and other environmental and industrial processes. The In-Situ Rugged Dissolved Oxygen (RDO) Sensor measures DO using the latest advancements in optical measurement technology. Water quality professionals will benefit from In-Situ Inc.'s investment in new product development. By ...
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Metal Mixture Modeling Evaluation project: 2. Comparison of four modeling approaches
As part of the Metal Mixture Modeling Evaluation (MMME) project, models were developed by the National Institute of Advanced Industrial Science and Technology (Japan), the U.S. Geological Survey (USA), HDR׀HydroQual, Inc. (USA), and the Centre for Ecology and Hydrology (UK) to address the effects of metal mixtures on biological responses of aquatic organisms. A comparison of the 4 models, as ...
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Observed trends in the river ice regimes of northwest Canada
Yukon air temperature trends have been observed to change over the last several decades with an increase in annual, summer and winter air temperatures, while changes in precipitation have not been consistent. An assessment of freeze-up and break-up dates indicates that the ice cover season is becoming shorter with delays in freeze-up and advances in break-up timing. Mid-winter break-up events and ...
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Hydroinformatics in multi-colours—part green: applications in aquatic ecosystem modelling
The present paper focuses on demonstrating the capabilities of modern hydroinformatics tools in the field of environmental systems by integrating biotic and abiotic process modelling. Abiotic processes like hydrodynamic flow and transport phenomena are often formulated based on physical principles like conservation of mass, momentum and energy. These processes are adequately represented ...
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Cyst-Based Toxicity Tests. - VI. : Toxkits and Fluotox Tests as Cost-Effective Tools for Routine Toxicity Screening
Abstract : During the last two decades microbiotests have been developed which are independent of recruitement, maintenance and/or culturing of live stocks of test organisms. Culture and maintenance free microbiotests have been worked out in the Laboratory for Biological Research in Aquatic Pollution at the University of Ghent, with selected aquatic invertebrates. The new approach is based on the ...
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Developing a national water quality criteria system in China
Water quality criteria (WQC) form a scientific basis for the development of water quality standards. The study of WQC in China has been insufficient. This mini review introduces the progress that has been made towards the establishment of a WQC system in China. A systematic WQC study has been ongoing in China for several years, mainly referring to the WQC system in the United States. Some ...
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Environmental fate of nanoparticles: physical chemical and biological aspects – a few snapshots
The environmental risk that nanomaterials can undergo is a major problem, which could prevent the commercial development of nanoproducts, especially in technology domains corresponding to large distribution: cosmetics, composite materials, civil engineering materials and leisure materials. The risk assessment is based on a complex approach, which implies the knowledge of the degradation ...
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Prioritization of pharmaceuticals for potential environmental hazard through leveraging a large scale mammalian pharmacological dataset
The potential for pharmaceuticals in the environment to cause adverse ecological effects is of increasing concern. Given the thousands of active pharmaceutical ingredients (APIs) which can enter the aquatic environment through human and/or animal (e.g., livestock) waste, a current challenge in aquatic toxicology is identifying those that pose the greatest risk. Because empirical toxicity ...
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Cyst-Based Toxicity Tests. - I. A Promising New Tool for Rapid and Cost Effective Toxicity Screening of Chemicals and Effluents
Abstract : The determination of the toxicity of effluents and wastes at the aid of biological tests (bioassays) is hampered very seriously by the necessity of continuous culturing or maintenance of live stocks of test organisms in sufficient numbers and in a healthy state. Consequently such assays are (and can) only be performed in specialized laboratories and in limited number because of the ...
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Comparison of the Conventional Algal Assay and the Algaltoxkit FTM Microbiotest for Toxicity Evaluation of Sediment Pore Waters
Abstract : Conventional algal tests have not been utilized to their full potential for routine toxicity assessments. This is mainly due to the complexicity of these assays and the fact that many operators are still encountering practical difficulties. In view of the need for a cost-effective alternative to standard algal assays for routine testing, a new culture/maintanance free algal test was ...
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Peracetic acid for secondary effluent disinfection: a comprehensive performance assessment
The paper is a review of previous research on secondary effluent disinfection by peracetic acid (PAA) integrated with new data about the effect of a preliminary flash-mixing step. The process was studied at bench and pilot scale to assess its performance for discharge in surface water and agricultural reuse (target microorganisms: Escherichia coli and faecal coliform bacteria). The purposes of ...
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Maximizing the accuracy of field‐derived numeric nutrient criteria in water quality regulations
High levels of the nutrients nitrogen and phosphorus can cause unhealthy biological or ecological conditions in surface waters, and prevent the attainment of their designated uses. Regulatory agencies are developing numeric criteria for these nutrients in an effort to ensure that the surface waters in their jurisdictions remain healthy and productive, and that water quality standards are met. ...
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Cyst-Based Toxicity Tests. - XIV Application Of The Ostracod Solid Phase Microbiotest For Toxicity Monitoring Of River Sediments In Flanders (Belgium)
Abstract: In view of the need for rapid and low cost solid phase assays for contaminated sediments, a new 6 days “culture/maintenance free” microbiotest has been developed at the Laboratory for Biological Research in Aquatic Pollution at the Ghent University in Belgium, with the freshwater ostracod crustacean Heterocypris incongruens. The sensitivity of the Ostracodtoxkit FTM has ...
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A framework for screening sites at risk from contaminants of emerging concern
Trace levels of a variety of currently unregulated organic chemicals have been detected in treated wastewater effluents and surface waters that receive treated effluents. Many of these chemicals of emerging concern (CECs) originate from pharmaceuticals and personal care products that are used widely and that frequently are transported “down the drain” to a wastewater treatment plant (WWTP). ...
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Dissolved oxygen measurements in aquatic environments: The effects of changing temperature and pressure on three sensor technologies
Dissolved oxygen (DO) is probably the most important parameter related to water quality and biological habitat in aquatic environments. In situ DO sensors are some of the most valuable tools used by scientists and engineers for the evaluation of water quality in aquatic ecosystems. Presently, we cannot accurately measure DO concentrations under variable temperature and pressure conditions. ...
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Different Kinds of Freshwater Angelfishes (2)
Different Kinds of Angelfish4.Blue AngelfishScientific name: Pterophyllum scalare varEnglish name: Blue angelfishThe blue angelfish's body surface exudes pure white and blue luster, and the blue color of the dorsal and anal fins is more obvious. It looks very gentle. This soft appearance is very distinctive among the improved species of the angelfish.5.Golden AngelfishScientific name: ...
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Chlorine disinfection of
Pseudomonas aeruginosa , total coliforms,Escherichia coli andEnterococcus faecalis : revisiting reclaimed water regulationsPathogenic organisms can be transmitted orally through drinking water or through skin and mucosae by both direct and indirect contact, and their presence in water thus has a negative impact on public health. In wastewater treatment plants (WWTP), water is disinfected to inactivate pathogens. The quantification of several microbial indicators in aquatic systems is required to estimate the ...
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Why is Water Temperature Important in Determining Water Quality?
Water temperature as a key factor in the success of aquatic environments and influences several parameters that can alter its physical and chemical properties. The temperature of water defines growing seasons and dictates what species can survive in a particular body of water.Temperature plays an essential role in water chemistry and can affect biological characteristics of surface water, ...
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Toxicity reduction in industrial and municipal effluents – the state of the art
Developments in treatment technology have traditionally focused on removal of specific contaminants: BOD, solids, ammonia, TOC and lately, specific organics such as phenol. A limit on effluent toxicity, however, does not fit so neatly into a procedural package, since it truly integrates the presence and impacts of contaminants in a sample. Toxicity reduction evaluation procedures, therefore, are ...
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