The Experts below are selected from a list of 177 Experts worldwide ranked by ideXlab platform
Taejin Park - One of the best experts on this subject based on the ideXlab platform.
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development of water quality criteria of ammonia for protecting aquatic life in freshwater using species sensitivity distribution method
Science of The Total Environment, 2018Co-Authors: Taejin Park, Changhee Park, Seongdae Moon, Jiwoong Chung, Younjoo An, Donghyuk YeomAbstract:Abstract Ammonia is deemed one of the most important pollutants in the freshwater environment because of its highly toxic nature and ubiquity in surface water. This study thus aims to derive the criteria for ammonia in freshwater to protect aquatic life because there are no water quality criteria for ammonia in Korea. Short-term lethal tests were conducted to perform the species sensitivity distribution (SSD) method. This method is widely used in ecological risk Assessment to determine the chemical concentrations to protect aquatic species. Based on the species sensitivity distribution method using Korean indigenous aquatic biota, the hazardous concentration for 5% of biological species (HC5) value calculated in this study was 44 mg/L as total ammonia nitrogen (TAN). The value of the Assessment Factor was set at 2. Consequently, the criteria for ammonia were derived as 22 mg/L at pH 7 and 20 °C. When the derived value was applied to the monitoring data nationwide, 0.51%, 0.09%, 0.18%, 0.20%, and 0.35% of the monitoring sites in Han River, Nakdong River, Geum River, Youngsan River, and lakes throughout the nation, respectively, exceeded this criteria. The Ministry of Environment in Korea has been considering introducing water quality standard of ammonia for protecting aquatic life. Therefore, our results can provide the basis for introducing the ammonia standard in Korea.
Donghyuk Yeom - One of the best experts on this subject based on the ideXlab platform.
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development of water quality criteria of ammonia for protecting aquatic life in freshwater using species sensitivity distribution method
Science of The Total Environment, 2018Co-Authors: Taejin Park, Changhee Park, Seongdae Moon, Jiwoong Chung, Younjoo An, Donghyuk YeomAbstract:Abstract Ammonia is deemed one of the most important pollutants in the freshwater environment because of its highly toxic nature and ubiquity in surface water. This study thus aims to derive the criteria for ammonia in freshwater to protect aquatic life because there are no water quality criteria for ammonia in Korea. Short-term lethal tests were conducted to perform the species sensitivity distribution (SSD) method. This method is widely used in ecological risk Assessment to determine the chemical concentrations to protect aquatic species. Based on the species sensitivity distribution method using Korean indigenous aquatic biota, the hazardous concentration for 5% of biological species (HC5) value calculated in this study was 44 mg/L as total ammonia nitrogen (TAN). The value of the Assessment Factor was set at 2. Consequently, the criteria for ammonia were derived as 22 mg/L at pH 7 and 20 °C. When the derived value was applied to the monitoring data nationwide, 0.51%, 0.09%, 0.18%, 0.20%, and 0.35% of the monitoring sites in Han River, Nakdong River, Geum River, Youngsan River, and lakes throughout the nation, respectively, exceeded this criteria. The Ministry of Environment in Korea has been considering introducing water quality standard of ammonia for protecting aquatic life. Therefore, our results can provide the basis for introducing the ammonia standard in Korea.
Ricardo Beiras - One of the best experts on this subject based on the ideXlab platform.
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ecotoxicologically based marine acute water quality criteria for metals intended for protection of coastal areas
Science of The Total Environment, 2013Co-Authors: Iria Duran, Ricardo BeirasAbstract:Abstract Acute water quality criteria (WQC) for the protection of coastal ecosystems are developed on the basis of short-term ecotoxicological data using the most sensitive life stages of representative species from the main taxa of marine water column organisms. A probabilistic approach based on species sensitivity distribution (SSD) curves has been chosen and compared to the WQC obtained applying an Assessment Factor to the critical toxicity values, i.e. the ‘deterministic’ approach. The criteria obtained from HC 5 values (5th percentile of the SSD) were 1.01 μg/l for Hg, 1.39 μg/l for Cu, 3.83 μg/l for Cd, 25.3 μg/l for Pb and 8.24 μg/l for Zn. Using sensitive early life stages and very sensitive endpoints allowed calculation of WQC for marine coastal ecosystems. These probabilistic WQC, intended to protect 95% of the species in 95% of the cases, were calculated on the basis of a limited ecotoxicological dataset, avoiding the use of large and uncertain Assessment Factors.
Arnaud Elger - One of the best experts on this subject based on the ideXlab platform.
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genotypes of the aquatic plant myriophyllum spicatum with different growth strategies show contrasting sensitivities to copper contamination
Chemosphere, 2020Co-Authors: Eva Roubeau Dumont, Camille Larue, Hiram Castillo Michel, Herve Gryta, Clarisse Line, David Baque, Elisabeth M Gross, Arnaud ElgerAbstract:Abstract Genotypic variability has been considered for years as a key attribute in species adaptation to new environments. It has been extensively studied in a context of chemical resistance, but remains poorly studied in response to chemical exposure in a context of global change. As aquatic ecosystems are particularly affected by environmental changes, we aimed to study how genotypic variability could inflect the sensitivity of aquatic plants to chemicals. Seven genotypes of Myriophyllum spicatum were exposed to three copper concentrations at 0, 0.15 and 0.5 mg/L. The sensitivity of the different genotypes was assessed through several endpoints such as relative growth rate (RGR) and morphological traits, as well as physiological markers, such as plant biomacromolecular composition. Our results showed that genotypes exhibited significant differences in their life-history traits in absence of chemical contamination. Some trait syndromes were observed, and three growth strategies were identified: (1) biomass production and main shoot elongation, (2) dry matter storage with denser whorls to promote resource conservation and (3) lateral shoot production. An up to eightfold difference in sensitivity for growth-related endpoints was observed among genotypes. Differences in sensitivity were partly attributed to morphological life-history traits. Our results confirm that genotypic variability can significantly affect M. spicatum sensitivity to Cu, and may influence the outcomes of laboratory testing based on the study of one single genotype. We recommend including genotypic variation as an Assessment Factor in ecological risk Assessment and to study this source of variability more in depth as a possible driver of ecosystem resilience.
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toxicity effects of an environmental realistic herbicide mixture on the seagrass zostera noltei
Environmental Pollution, 2017Co-Authors: Noel J Diepens, Evelyne Buffandubau, Helene Budzinski, Jean Kallerhoff, Georges Merlina, Jerome Silvestre, Isabelle Auby, Nathalie Tapie, Arnaud ElgerAbstract:Worldwide seagrass declines have been observed due to multiple stressors. One of them is the mixture of pesticides used in intensive agriculture and boat antifouling paints in coastal areas. Effects of mixture toxicity are complex and poorly understood. However, consideration of mixture toxicity is more realistic and ecologically relevant for environmental risk Assessment (ERA). The first aim of this study was to determine short-term effects of realistic herbicide mixture exposure on physiological endpoints of Zostera noltei. The second aim was to assess the environmental risks of this mixture, by comparing the results to previously published data. Z. noltei was exposed to a mixture of four herbicides: atrazine, diuron, irgarol and S-metolachlor, simulating the composition of typical cocktail of contaminants in the Arcachon bay (Atlantic coast, France). Three stress biomarkers were measured: enzymatic activity of glutathione reductase, effective quantum yield (EQY) and photosynthetic pigment composition after 6, 24 and 96 h. Short term exposure to realistic herbicide mixtures affected EQY, with almost 100% inhibition for the two highest concentrations, and photosynthetic pigments. Effect on pigment composition was detected after 6 h with a no observed effect concentration (NOEC) of 1 μg/L total mixture concentration. The lowest EQY effect concentration at 10% (EC10) (2 μg/L) and pigment composition NOEC with an Assessment Factor of 10 were above the maximal field concentrations along the French Atlantic coast, suggesting that there are no potential short term adverse effects of this particular mixture on Z. noltei. However, chronic effects on photosynthesis may lead to reduced energy reserves, which could thus lead to effects at whole plant and population level. Understanding the consequences of chemical mixtures could help to improve ERA and enhance management strategies to prevent further declines of seagrass meadows worldwide.
Ivo Roessink - One of the best experts on this subject based on the ideXlab platform.
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effects of sediment spiked lufenuron on benthic macroinvertebrates in outdoor microcosms and single species toxicity tests
Aquatic Toxicology, 2016Co-Authors: T C M Brock, J. Dick M. Belgers, M C Boerwinkel, Michiel H S Kraak, Jan Arie Vonk, Derek A. Bas, L Bibbe, Steven J H Crum, Noel J Diepens, Ivo RoessinkAbstract:Sediment ecotoxicity studies were conducted with lufenuron to (i) complement the results of a water-spiked mesocosm experiment with this lipophilic benzoylurea insecticide, (ii) to explore the predictive value of laboratory single-species tests for population and community-level responses of benthic macroinvertebrates, and (iii) to calibrate the tier-1 effect Assessment procedure for sediment organisms. For this purpose the concentration-response relationships for macroinvertebrates between sediment-spiked microcosms and those of 28-d sediment-spiked single-species toxicity tests with Chironomus riparius, Hyalella azteca and Lumbriculus variegatus were compared. Lufenuron persisted in the sediment of the microcosms. On average, 87.7% of the initial lufenuron concentration could still be detected in the sediment after 12 weeks. Overall, benthic insects and crustaceans showed treatment-related declines and oligochaetes treatment-related increases. The lowest population-level NOEC in the microcosms was 0.79 μg lufenuron/g organic carbon in dry sediment (μg a.s./g OC) for Tanytarsini, Chironomini and Dero sp. Multivariate analysis of the responses of benthic macroinvertebrates revealed a community-level NOEC of 0.79 μg a.s./g OC. The treatment-related responses observed in the microcosms are in accordance with the results of the 28-d laboratory toxicity tests. These tests showed that the insect C. riparius and the crustacean H. azteca were approximately two orders of magnitude more sensitive than the oligochaete L. variegatus. In our laboratory tests, using field-collected sediment, the lowest 28-d EC10 (0.49 μg a.s./g OC) was observed for C. riparius (endpoint survival), while for the standard OECD test with this species, using artificial sediment, a NOEC of 2.35 μg a.s./g OC (endpoint emergence) is reported. In this particular case, the sediment tier-1 effect Assessment using the chronic EC10 (field-collected sediment) or chronic NOEC (artificial sediment) of C. riparius and an Assessment Factor of 10, seems to be protective for the treatment-related responses observed in the sediment-spiked microcosms.
