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C Venâncio, R Ribeiro, A M V M Soares, I Lopes
Sea level rise, as a consequence of climate changes, is already causing seawater intrusion in some freshwater coastal ecosystems worldwide. The increase in salinity at these freshwater coastal ecosystems may occur gradually (through groundwater) or abruptly (through extreme weather events). Moreover, many of them are also being altered and threatened by anthropogenic activities. Accordingly, the present study aimed at assessing the multigenerational lethal and sublethal effects caused by increased salinity in six clonal lineages of the freshwater cladoceran Daphnia longispina differing in their sensitivity to lethal levels of copper...
November 14, 2017: Science of the Total Environment
Hannes K Imhof, Jakub Rusek, Michaela Thiel, Justyna Wolinska, Christian Laforsch
Microplastic particles are ubiquitous not only in marine but also in freshwater ecosystems. However, the impacts of microplastics, consisting of a large variety of synthetic polymers, on freshwater organisms remains poorly understood. We examined the effects of two polymer mixtures on the morphology, life history and on the molecular level of the waterflea Daphnia magna (three different clones). Microplastic particles of ~40 μm were supplied at a low concentration (1% of the food particles) leading to an average of ~30 particles in the digestive tract which reflects a high microplastic contamination but still resembles a natural situation...
2017: PloS One
Yingying Liu, Wenhong Fan, Zhizhen Xu, Weihua Peng, Shenglian Luo
Although the risk of graphene materials to aquatic organisms has drawn wide attention, the combined effects of graphene materials with other contaminants such as toxic metals, which may bring about more serious effects than graphene materials alone, have seldom been explored. Herein, the effects of graphene (GN) and graphene oxide (GO, an important oxidized derivative of graphene) on copper (Cu) toxicity to Daphnia magna were systematically investigated. The results indicated that GN remarkably increased the Cu accumulation in D...
November 11, 2017: Environmental Pollution
Yassine Ouarda, Bhagyashree Tiwari, Antonin Azaïs, Marc-Antoine Vaudreuil, Sokhna Dieng Ndiaye, Patrick Drogui, Rajeshwhar Dayal Tyagi, Sébastien Sauvé, Mélanie Desrosiers, Gerardo Buelna, Rino Dubé
In this work, the combination of membrane bioreactor (MBR) and electro-oxidation (EO) process was studied for the treatment of a synthetic hospital wastewater fortified with four pharmaceutical pollutants namely carbamazepine (CBZ), ibuprofen (IBU), estradiol (E-E) at a concentration of 10 μg L(-1) venlafaxine (VEN) at 0.2 μg L(-1). Two treatment configurations were studied: EO process as pre-treatment and post-treatment. Wastewater treatment with MBR alone shows high removal percentages of IBU and E-E (∼90%)...
November 4, 2017: Chemosphere
Jordan R Nelson, Tonia S Schwartz, Julia M Gohlke
Selenium deficiency and toxicity increase the risk of adverse developmental and reproductive outcomes; however, few multi-stressor studies have evaluated the influence of maternal age on organic selenium dose-response and additional stressors over the life course. While multi-stressor research in mammalian models is time-consuming and expensive, use of alternative models can efficiently produce screening data for prioritizing research in mammalian systems. As a well-known eco-toxicological model, Daphnia pulex, may offer advantages in screening for impacts of multi-stressor exposures...
November 8, 2017: Reproductive Toxicology
Min Liu, Haowen Yin, Xiaoqian Chen, Jing Yang, Yihuai Liang, Jingji Zhang, Fan Yang, Yunyun Deng, Shen Lu
Recent regulatory and environmental pressures have led to increasing demands for environmentally friendly flame retardants as alternatives to halogenated flame retardants (HFRs). A new flame retardant alternative, 10-(2, 5-dihydroxyl phenyl)-9, 10-dihydro-9-oxa-10- phosphaphenanthrene-10-oxide (DOPO-HQ), was applied due to its high thermal stability and glass transition temperature. However, there is little information available for its ecotoxicology. For this purpose, the preliminary ecotoxicity of DOPO-HQ was investigated and evaluated, using aquatic, terrestrial and microorganism toxicity according to Organization for Economic Co-operation and Development (OECD) guidelines under the framework of the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) regulation...
November 1, 2017: Chemosphere
Jin J Li, Xu J Zhang, Yi Yang, Tao Huang, Chao Li, Limin Su, Yuan H Zhao, Mark T D Cronin
The acute toxicity of organic pollutants to fish, Daphnia magna, Tetrahymena pyriformis, and Vibrio fischeri was investigated. The results indicated that the Toxicity Ratio (TR) threshold of log TR =1, which has been based on the distribution of toxicity data to fish, can also be used to discriminate reactive or specifically acting compounds from baseline narcotics for Daphnia magna and Vibrio fischeri. A log TR=0.84 is proposed for Tetrahymena pyriformis following investigation of the relationships between the species sensitivity and the absolute averaged residuals (AAR) between the predicted baseline toxicity and the experimental toxicity...
November 8, 2017: Science of the Total Environment
Stella Parmaki, Ioannis Vyrides, Marlen I Vasquez, Viki Hartman, Irene Zacharia, Ioanna Hadjiadamou, Catarina B M Barbeitos, Frederico C Ferreira, Carlos A M Afonso, Chrysoulla Drouza, Michalis Koutinas
This work explores the potential for development of a lupanine valorization process evaluating different isolated microorganisms for their capacity to metabolize the alkaloid. Ecotoxicological assessment demonstrated that lupanine is toxic for Vibrio fischeri and Daphnia magna exhibiting EC50 values of 89 mg L(-1) and 47 mg L(-1) respectively, while acting both as growth inhibitor for a monocotyledonous and as promoter for a dicotyledonous plant. Among the eight aerobic and anaerobic strains isolated and identified Rhodococcus rhodochrous LPK211 achieved 81% removal for 1...
October 30, 2017: Chemosphere
Ana Del Arco, Gema Parra, Inmaculada de Vicente
Aquatic population responses to chemical exposure may be exacerbated by intraspecific competition pressures, being also shaped by habitat heterogeneity. Magnetic particles (MPs) have been recently proposed as promising phosphorus (P) adsorbents for lake restoration. This study focuses on assessing the effects of MPs on the abundance of the crustacean Daphnia magna under different levels of both intraspecific competition pressure and habitat heterogeneity. The experimental design consisted of two experiments (in homogeneous and heterogeneous habitats) done in glass jars with four concentrations of MPs: controls of 0g MPsL(-1), and treatments of 1, 1...
November 7, 2017: Ecotoxicology and Environmental Safety
Miguel Barbosa, Núrya Inocentes, Amadeu M V M Soares, Miguel Oliveira
Increased variability in water temperature is predicted to impose disproportionally greater fitness costs than mean increase in temperature. Additionally, water contaminants are currently a major source of human-induced stress likely to produce fitness costs. Global change models forecast an increase in these two human-induced stressors. Yet, in spite the growing interest in understanding how organisms respond to global change, the joint fitness effects of water pollution and increased variability in temperature remain unclear...
November 7, 2017: Aquatic Toxicology
Antoine Gosset, Adriana Wigh, Sylvie Bony, Alain Devaux, Rémy Bayard, Claude Durrieu, Melissa Brocart, Marine Applagnat, Christine Bazin
Standardized ecotoxicity bioassays show some limits to assess properly long-term residual toxicity of complex mixture of pollutants often present at low concentration, such as stormwaters. Among invertebrate organisms used for ecotoxicity testing, the microcrustacean Ceriodaphnia dubia (C. dubia) is considered as one of the most sensitive, especially regarding reproduction impairment as a toxicity endpoint. Consequently, this work explores the interest to perform a multigenerational assay based on the study of the reproduction of C...
November 9, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
C M Coakley, E Nestoros, T J Little
Maternal effects are widely observed, but their adaptive nature remains difficult to describe and interpret. We investigated adaptive maternal effects in a clone of the crustacean Daphnia magna, experimentally varying both maternal age and maternal food and subsequently varying food available to offspring. We had two main predictions: that offspring in a food environment matched to their mothers should fare better than offspring in unmatched environments, and that offspring of older mothers would fare better in low food environments...
November 8, 2017: Journal of Evolutionary Biology
Han Li, Siliang Yuan, Guanyong Su, Meng Li, Qiangwei Wang, Guonian Zhu, Robert J Letcher, Yufei Li, Zhihua Han, Chunsheng Liu
Toxicity tests of chemicals have mainly focused on the partial life-cycle evaluation of model animals. Limited information is available for the evaluation of effects of chemicals from a whole-life-stage exposure perspective. The objective of this study was to perform a whole-life-stage characterization in the basic biology of Daphnia magna (D. magna) and evaluate the effects of a known organophosphate ester (OPE) contaminant, tris(1,3-dichloro-2-propyl) phosphate (TDCIPP), on growth, reproduction, survival, and transcription of genes...
November 17, 2017: Environmental Science & Technology
Mariângela Spadoto, Ana Paula Erbetta Sueitt, Carlos Alexandre Galinaro, Tiago da Silva Pinto, Caroline Moço Erba Pompei, Clarice Maria Rispoli Botta, Eny Maria Vieira
Toxicities of bisphenol A (BPA) and nonylphenol (NP) to the neotropical freshwater cladocerans Ceriodaphnia silvestrii and Daphnia similis were studied under laboratory conditions. Acute exposures to BPA generated mean 48-h EC50 values of 14.44 (6.02-22.85) mg L(-1) for C. silvestrii and 12.05 (1.73-22.37) mg L(-1) for D. similis. When the organisms were exposed to acute doses of NP, mean 48-h EC50 values were 0.055 (0.047-0.064) mg L(-1) (C. silvestrii) and 0.133 (0.067-0.200) mg L(-1) (D. similis). Ceriodaphnia silvestrii was also tested in chronic bioassays, which resulted in mean 8-d IC25 values of 2...
November 8, 2017: Drug and Chemical Toxicology
Ping Liu, Lei Xu, Shao-Lin Xu, Alejandro Martínez, Hua Chen, Dan Cheng, Henri J Dumont, Bo-Ping Han, Diego Fontaneto
Cladocerans are well-studied planktonic crustaceans, especially those of the genus Daphnia in which interesting evolutionary questions have been addressed on speciation processes. The aim of the present study is to demonstrate that other genera of cladocerans show similar levels of cryptic diversity, intraspecific gene flow, and thus become useful model systems for comparison. In order to do so, we chose the genus Diaphanosoma, widespread in tropical and temperate areas. We started with a survey of species diversity in the genus Diaphanosoma in Asia using a morphological approach, then obtained sequences from a mitochondrial and a nuclear marker from multiple individuals of different species, performed tests on DNA taxonomy and molecular phylogenies, and assessed the role of hybridization in explaining the cases of mitonuclear discordance...
November 2, 2017: Molecular Phylogenetics and Evolution
Ana Lourdes Oropesa, Fernando Juan Beltrán, António Miguel Floro, Juan José Pérez Sagasti, Patrícia Palma
The aim of the present study was to evaluate the ecotoxicological efficiency of two advanced ozonation processes (AOzPs), the catalytic ozonation (O3/TiO2) and the photocatalytic ozonation (O3/TiO2/black light), in the remotion of carbamazepine. The ecotoxicological efficiency was assessed through the use of lethal and sublethal assays with species Vibrio fischeri and Daphnia magna. Results demonstrated that the AOzPs presented an efficiency of carbamazepine removal higher than 99% (carbamazepine < 2 μg/L) after 12 min of treatment...
November 3, 2017: Environmental Science and Pollution Research International
Amie L Robison, Trevor Chapman, Joseph R Bidwell
The response of aquatic species to contaminants is often context dependent as illustrated by the influence that predation cues can have on the toxicity of some chemicals. We sought to gain additional insight into this interaction by examining how predation cues (alarm cue and fish kairomone) influence metabolic rate and the acute toxicity of sodium chloride and cadmium to fathead minnow larvae (Pimephales promelas) and sodium chloride to Daphnia pulex neonates. Consistent with a "flight or fight" response, the metabolic rate of fish larvae was elevated in the presence of alarm cue and growth of the minnows was also significantly reduced when exposed to alarm cue...
November 3, 2017: Ecotoxicology
Dylan Steinkey, Ebrahim Lari, Samuel G Woodman, Kim H Luong, Charles S Wong, Greg G Pyle
Gemfibrozil, a common lipid regulator, enters aquatic environments through treated municipal wastewater effluent that fails to remove it completely from effluent streams. When exposed to gemfibrozil concentrations of 50, 500, 5,000, and 50,000 ng L(-1), Daphnia magna showed increased lipid reserves by 14-21% (significant at 500 ng L(-1)), increased length by 9-13% (significant at 50 ng L(-1)), increased mass by 6-13% (significant at 50 ng L(-1)) and increased neonate production by 57-74% (significant at 50 ng L(-1))...
October 31, 2017: Chemosphere
Quang Dang Nong, Nur Syafiqah Mohamad Ishak, Tomoaki Matsuura, Yasuhiko Kato, Hajime Watanabe
Sexually dimorphic traits are common and widespread among animals. The expression of the Doublesex-/Mab-3-domain (DM-domain) gene family has been widely studied in model organisms and has been proven to be essential for the development and maintenance of sex-specific traits. However, little is known about the detailed expression patterns in non-model organisms. In the present study, we demonstrated the spatiotemporal expression of the DM-domain gene, doublesex1 (dsx1), in the crustacean Daphnia magna, which parthenogenetically produces males in response to environmental cues...
November 2, 2017: Scientific Reports
Suzhen Qi, Donghui Wang, Lizhen Zhu, Miaomiao Teng, Chengju Wang, Xiaofeng Xue, Liming Wu
Cycloxaprid (CYC) and guadipyr (GUA) are two new and promising neonicotinoid insecticides whose effects on Daphnia magna are as yet unknown. In this study, the acute toxicities of CYC and GUA to D. magna, including immobilization and embryo-hatching inhibition, and their effects on antioxidant enzymes and related gene expression were determined after a 48-h exposure. Imidacloprid (IMI) was evaluated at the same time as a reference agent. The 48-h EC50 values of IMI, GUA, and CYC for neonate immobilization were 13...
October 30, 2017: Ecotoxicology and Environmental Safety
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