aquatic ecology Articles
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Modeling the long-term effect of PCBs on Everglades fish communities
Fish communities are regularly exposed to a large number of natural and synthetic toxic chemicals, whose harmful effects, both short-term and long-term, need to be studied. Mathematical simulation models are known to be useful tools in the assessment of both acute and chronic effects. A time-concentration-effect model has been developed to assess the long-term effect of PCBs on multi generations ...
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The role of
Actinobacteria in taste and odour episodes involving geosmin and 2-methylisoborneol in aquatic environmentsThe secondary metabolites geosmin and 2-methylisoborneol (2-MIB) provide soil with its characteristic earthy-musty odour, being notably produced by the abundant spore-forming filamentous bacterial genus Streptomyces, among other Actinobacteria. Taste and odour (T&O) problems attributed to these compounds affect drinking water supplies worldwide, often occurring sporadically and untraced ...
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A refined aquatic ecological risk assessment for a pyrethroid insecticide used for adult mosquito management
The use of pyrethroid insecticides has increased substantially throughout the world over the past few decades as the use of organophorous, carbamate, and organochlorine insecticides is being phased out. Pyrethroids are the most common class of insecticides for ultralow‐volume (ULV) aerosol applications used to manage high densities of adult mosquitoes. Pyrethroids are highly toxic to nontarget ...
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Application of Bayesian regularized BP neural network model for analysis of aquatic ecological data - A case study of chlorophyll-a prediction in Nanzui water area of Dongting Lake
Bayesian regularized BP neural network (BRBPNN) technique was applied in the chlorophyll-a prediction of Nanzui water area in Dongting Lake. Through BP network interpolation method, the input and output samples of the network were obtained. After the selection of input variables using stepwise/multiple linear regression method in SPSS 11.0 software, the BRBPNN model was established between ...
By IOS Press
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Tracing fine sediment sources in small mountain catchment
Fine sediment represents an important diffuse source pollutant in surface waters, due to its role in governing the transfer and fate of many substances, including nutrients, heavy metals, pesticides and other organic contaminants, and its influence on aquatic ecology. Therefore, catchment management strategies frequently need to include provision for the control of sediment mobilization and ...
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Application of species sensitivity distribution in aquatic probabilistic ecological risk assessment of cypermethrin: A case study in an urban stream in South China
A tiered ecological risk assessment (ERA) was applied to quantitatively refine the overall probabilistic risk of cypermethrin, a pyrethroid insecticide, to aquatic organisms. These results were then validated through the bioassays using field water from an urban stream, Chebei Creek in Guangzhou, South China. Seventeen water samples were collected along Chebei Creek for evaluation. In total, ...
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Spatial–temporal distribution of phthalate esters from riverine outlets of Pearl River Delta in China
The aquatic environments of the Pearl River Delta (PRD) in China have been contaminated by various industrial chemicals from local industries. In this study, the spatial–temporal distribution of six priority phthalate esters (PAEs) in surface water and sediments from the PRD was investigated. The PAEs were detected with total concentrations (Σ6PAEs) ranging from 0.35 to 20.70 ...
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Plankton diversity and aquatic ecology of a freshwater lake (L3) at Bharti Island, Larsemann Hills, east Antarctica
The Larsemann Hills range is an ice-free oasis on the Ingrid Christensen Coast of Princess Elizabeth Land, East Antarctica, which includes Bharti Island, Fisher Island, McLeod Island, Broknes Peninsula, Stornes Peninsula, and several other islands, promontories, and nunataks. The Larsemann Hills is an ice-free area of approximately 50 km2, located halfway between the Vestfold Hills and the Amery ...
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Assessing Ecological Risks to the Fish Community from Residual Coal Fly Ash in Watts Bar Reservoir, Tennessee
Extensive site‐specific biological and environmental data were collected to support an evaluation of risks to the fish community in Watts Bar Reservoir from residual ash from the December 2008 Tennessee Valley Authority (TVA) Kingston ash release. This paper describes the approach used and results of the risk assessment for the fish community, which consists of multiple measurement endpoints ...
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Evaluation of the combined effects of binary mixtures of sodium hypochlorite and surfactants against Daphnia magna Straus
Detergents and disinfectants have been identified as the most probable products that are responsible for the ecotoxicity of hospital effluents. This study was carried out to evaluate the acute toxicity and the combined effects of binary mixtures of sodium hypochlorite (NaOCl) and three detergents (CTAB, SDS, TX-100) used in hospital medium, on Daphnia magna. Each binary mixture was prepared in ...
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Factors influencing hydroquinone degradation in aqueous solution using a modified microelectrolysis method
The discharge of hydroquinone (HQ), an important chemical raw material, to natural waters poses different ecological threats to aquatic organisms. In this study, we investigated the removal performance of traditional and modified microelectrolysis methods in aqueous solutions. The traditional microelectrolysis packing was modified by adding manganese (Mn), zinc (Zn), and copper (Cu) powder as ...
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Attitudes of Europeans towards the issue of biodiversity
The European Union (EU) is committed to the protection of 'biological diversity', i.e. the variability among living organisms from all sources including, inter alia, terrestrial, marine, and other aquatic ecosystems and the ecological complexes of which they are part; this includes diversity within species, between species and of ecosystems1. The EU has been legislating on biodiversity since the ...
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An environmental perspective on the water management policies of the Upper Delaware River Basin
Since 1954, the Delaware River has been managed under the framework of a Supreme Court decree and the subsequent concomitant intergovernmental collaboration between New York State, New Jersey, Pennsylvania, Delaware, New York City (NYC) and the US federal government. Taking an environmental perspective, we review the evolution of water release policies for three NYC reservoirs from the ...
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Developing a foundation for eco‐epidemiological assessment of aquatic ecological status over large geographic regions utilizing existing data resources and models
Eco‐epidemiological studies utilizing existing monitoring program data provide a cost‐effective means to bridge the gap between ecological and chemical status of watersheds and to develop hypotheses of stressor attribution that can influence the design of higher‐tier assessments and subsequent management. The present study describes the process of combining existing data and models to develop ...
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Understanding and Managing the Effects of Climate Change on Aquatic Ecosystems
There is mounting evidence that climate-changeinduced extreme events are expected to adversely affect the aquatic ecosystems and ecosystem services that they provide. To address this need to understand how climate, aquatic ecological, and social systems interact and how to manage these coupled systems, LimnoTech is participating with a large team of researchers (from Stanford University, the ...
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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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Indirect photochemical transformations of acyclovir and penciclovir in aquatic environments increase ecological risk
Acyclovir and penciclovir, 2 antiviral drugs, are increasingly detected in aquatic environments. The present study explores the natural photochemical transformation mechanisms and fate of these drugs, examining direct and indirect photochemical transformation under simulated sunlight irradiation. The 2 antiviral drugs are photostable under certain conditions but significantly degrade in the ...
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Environmental Screening Levels (ESLs) for the San Francisco Bay Region
Environmental Screening Levels The Environmental screening levels (ESLs) are used to determine the concentration of contaminants present in different environmental domains, mainly encompassing soil, groundwater resources, water vapors, and ambient air at the specific site, which may impact the exposed human population. These are figurative points set to compare the level of contaminants present ...
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Spatial coexistence of phytoplankton species in ecological timescale
The species diversity of phytoplankton is usually very high in wild aquatic systems, as seen in the paradox of plankton. Coexistence of many competitive phytoplankton species is extremely common in nature. However, experiments and mathematical theories show that interspecific competition often leads to the extinction of most inferior species. Here, we present a lattice version of a multi-species ...
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High frequency monitoring needed to protect UK rivers - Case Study
The science behind nutrient pollution in rivers is still poorly understood despite the fact that nitrate and phosphate concentrations in the UK’s rivers are mostly unacceptable, although an element of uncertainty exists about what an acceptable level actually is. Key to improving our understanding of the sources and impacts of nutrient pollution is high-resolution monitoring across a broad ...
By OTT HydroMet
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