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B Díaz-Garduño, M G Pintado-Herrera, M Biel-Maeso, J J Rueda-Márquez, P A Lara-Martín, J A Perales, M A Manzano, C Garrido-Pérez, M L Martín-Díaz
Emerging contaminants (ECs) and regulated compounds (RCs) from three different WWTP effluents were measured in the current study. The efficiency of two tertiary treatments, Photobiotreatment (PhtBio) and Multi-Barrier Treatment (MBT), for removing contaminants was determined. Results indicated different percentages of removal depending on the treatment and the origin of the effluent. Risk Quotients (RQs) were determined for different species of algae, Daphnia, and fish. RQ results revealed diverse risk values depending on the bioindicator species...
April 10, 2017: Water Research
Liu Shi, Dong Wang, Di Cao, Chunhong Na, Xie Quan, Ying Zhang
The anaerobic-anoxic-oxic (A/A/O) process is the commonly used biological wastewater treatment process, especially for the coking wastewater. However, limit is known about its ability in bio-toxicity removal from wastewater. In this study, we evaluated the performance of A/A/O process in bio-toxicity removal from the coking wastewater, using two test species (i.e. crustacean (Daphnia magna) and zebra fish (Danio rerio)) in respect of acute toxicity, oxidative damage and genotoxicity. Our results showed that the acute toxicity of raw influent was reduced gradually along with A/A/O process and the effluent presented no acute toxicity to Daphnia magna (D...
April 21, 2017: Ecotoxicology and Environmental Safety
Şeyda Fikirdeşici Ergen, Esra Üçüncü Tunca
In this paper the aim is to model the toxic effect of zinc oxide nanoparticles (ZnONP) and is to analyze the removal of ZnONP in aqueous medium by the consortium consisted of Daphnia magna and Lemna minor. Three separate test groups are formed: L. minor (L), D. magna (D) and L.minor+D.magna (L+D) and all these test groups are exposed to three different nanoparticle concentrations (0.3;3.0 and 30.0 mg L(-)(1)). Time-dependent, concentration-dependent and group-dependent removal efficiencies are statistically compared by non-parametric Mann-Whitney U test and statistically significant differences are observed...
April 24, 2017: International Journal of Phytoremediation
Charlotte Nys, Colin R Janssen, Karel A C De Schamphelaere
In the present study, we observed that the chronic Zn Daphnia magna biotic ligand model (BLM) could not accurately predict the chronic Zn toxicity to Ceriodaphnia dubia in a series of (modified) field waters, although the intrinsic sensitivities of the D. magna BLM was specifically calibrated on the sensitivity of C. dubia. Moreover, it was observed that the D. magna BLM underestimated the effect of pH on toxicity of the free Zn(2+) ion. A preliminary species-specific chronic Zn C. dubia bioavailability model was developed based on the data...
April 24, 2017: Environmental Toxicology and Chemistry
Emilia Galdiero, Annarita Falanga, Antonietta Siciliano, Valeria Maselli, Marco Guida, Rosa Carotenuto, Margherita Tussellino, Lucia Lombardi, Giovanna Benvenuto, Stefania Galdiero
The use of quantum dots (QDs) for nanomedicine is hampered by their potential toxicologic effects and difficulties with delivery into the cell interior. We accomplished an in vivo study exploiting Daphnia magna and Xenopus laevis to evaluate both toxicity and uptake of QDs coated with the membranotropic peptide gH625 derived from the glycoprotein H of herpes simplex virus and widely used for drug delivery studies. We evaluated and compared the effects of QDs and gH625-QDs on the survival, uptake, induction of several responsive pathways and genotoxicity in D...
2017: International Journal of Nanomedicine
Edgar Pérez, Tham C Hoang
The present study characterized the chronic effect of binary-metal mixtures of cadmium (Cd) and zinc (Zn) on Daphnia magna. The titration design was chosen to characterize the 21-d chronic effects of the binary-metal mixtures on survival, growth, reproduction, and metal accumulation in D. magna. Using this design, increasing concentrations of Zn (10, 20, 40, 80, 120, 160 and 200µg/L) were titrated against a constant concentration of 1.5µg/L Cd. The results demonstrated that Cd was highly toxic to D. magna...
April 21, 2017: Environmental Toxicology and Chemistry
Siwon Lee, Wonseok Lee, Hyen-Mi Chung, Sangjung Park
A bacterial strain PBT33-2(T) was isolated from the air environment in an indoor pig farm. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain PBT33-2(T) belonged to the genus Nocardioides in the phylum Actinobacteria, and was most closely related to Nocardioides daphnia D287(T) in a maximum-likelihood and neighbor-joining phylogenetic trees. Strain PBT33-2(T) shared 95.3% sequence identity with N. daphnia D287(T). However, the highest sequence similarity was shown with N. sediminis MSL-01(T) (96...
April 20, 2017: Journal of Microbiology / the Microbiological Society of Korea
Marek Cuhra, Thomas Bøhn, Petr Cuhra
Plastic laboratory materials are found to affect vital parameters of the waterflea Daphnia magna. The main responsible factor is defined as "newness" of the materials. Juvenile D. magna were raised individually in; a) new laboratory-standard 50 ml polypropylene tubes, and; b) identical tubes which had been washed and aerated for several weeks. Newness had significant effects on growth and fecundity of D. magna. New tubes caused delayed maturation, reduced reproduction and reduced growth when compared to washed and re-used tubes of the same commercial brand...
April 20, 2017: Scientific Reports
Olivia Thompson, Stephen A Y Gipson, Matthew D Hall
Males and females vary in many characteristics that typically underlie how well a host is able to fight infection, such as body-size, immune capacity, or energy availability. Although well studied in the context of sexual signalling, there is now growing recognition that these differences can influence aspects of pathogen evolution as well. Here we consider how co-infection between multiple pathogen strains is shaped by male-female differences. In natural populations, infections by more than one pathogen strain or species are believed to be a widespread occurrence...
April 19, 2017: Scientific Reports
Martha N Kariuki, Edward G Nagato, Brian P Lankadurai, André J Simpson, Myrna J Simpson
¹H nuclear magnetic resonance (NMR)-based metabolomics was used to characterize the response of Daphnia magna after sub-lethal exposure to perfluorooctane sulfonate (PFOS), a commonly found environmental pollutant in freshwater ecosystems. Principal component analysis (PCA) scores plots showed significant separation in the exposed samples relative to the controls. Partial least squares (PLS) regression analysis revealed a strong linear correlation between the overall metabolic response and PFOS exposure concentration...
April 14, 2017: Metabolites
Siddiq Akbar, Jingjing Du, Yong Jia, Xingjun Tian
Changing environmental calcium (Ca) and rising cyanobacterial blooms in lake habitats could strongly reduce Daphnia growth and survival. Here, we assessed the effects of maternal Ca in Daphnia on transfer of resistance to their offspring against Microcystis aeruginosa PCC7806 (M. aeruginosa). Laboratory microcosm experiments were performed to examine effects in Daphnia carinata (D. carinata) and Daphnia pulex (D. pulex), and that how Ca induce responses in their offspring. The results showed that growth and survival were increased in offspring from exposed Daphnia as compared to unexposed, when raised in high Ca and increasing M...
2017: PloS One
Ebrahim Lari, Dylan Steinkey, Effat Mohaddes, Greg G Pyle
The increasing amount of stored oil sands process-affected water (OSPW), a primary by-product of oil sands mining, is an environmental concern. In the present study, we investigated the chronic effects of OSPW on growth, reproduction, and macronutrient content in Daphnia magna. To do so, we exposed D. magna to 1 and 10% OSPW (a mixture of three OSPW samples provided by major oil sands mining operators in northern Alberta) for ten days. We measured the number of the neonates produced daily in each group throughout the exposure...
April 8, 2017: Science of the Total Environment
Jiannan Ding, Hua Zou, Qingqing Liu, Shanshan Zhang, Roger Mamitiana Razanajatovo
The aim of this study was to evaluate the bioconcentration potential of fluoxetine and its biological effects in Daphnia magna. After 48h of waterborne exposure, the bioconcentration of fluoxetine in D. magna was determined to be 460.61 and 174.41Lkg(-1) for nominal exposure concentrations of 0.5 and 5µgL(-1), respectively. Moreover, various biological endpoints, including physiological responses (filtration and ingestion rates), enzymatic biomarkers related to neurotoxicity [acetylcholinesterase (AChE)] and antioxidant defense [superoxide dismutase (SOD)], and an oxidative stress damage marker [malondialdehyde (MDA)], were assessed...
April 7, 2017: Ecotoxicology and Environmental Safety
Bret L Coggins, John W Collins, Kailea J Holbrook, Lev Y Yampolsky
Examples of phenotypic plasticity-the ability of organisms of identical genotypes to produce different phenotypes in response to the environment-are abundant, but often lack data on the causative physiology and biochemistry. Phenotypes associated with increased protection against or reduced damage from harmful environments may, in fact, be downstream effects of hidden adaptive responses that remain elusive to experimental measurement or be obscured by homeostatic or over-compensatory effects. The freshwater zooplankton crustacean Daphnia drastically increases its heat tolerance as the result of acclimation to high temperatures, an effect often assumed to be based on plastic responses allowing better protection against oxidative stress...
April 7, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
Ebrahim Lari, Patrick Gauthier, Effat Mohaddes, Greg G Pyle
The toxicity of metal mixtures is currently of particular interest among aquatic toxicologists. To provide insight into whether the interaction of multiple metals is similar at different biological levels, the survival and feeding behavior of Daphnia magna were studied following exposure to four metals (Cd, Cu, Ni, Zn) and their binary and quaternary combinations. In terms of survival, Zn-Cu and Cu-Cd mixtures produced more-than-additive mortality, while Ni-Cd mixtures resulted in less-than-additive mortality...
March 28, 2017: Journal of Hazardous Materials
Carla Eloisa Fernández, Danny Rejas
Climate change and water extraction may result in increased exposition of the biota to ultraviolet-B radiation (UVB) in high-altitude Andean lakes. Although exposition to lethal doses in these lakes is unlikely, sub-lethal UVB doses may have strong impacts in key compartments such as zooplankton. Here, we aimed at determining the effect of sub-lethal UVB doses on filtration rates of two cladoceran species (Daphnia pulicaria and Ceriodaphnia dubia). We firstly estimated the Incipient Limiting Concentration (ILC) and the Gut Passage Time (GPT) for both species...
2017: PloS One
Shuqin Liu, Qingkun Hu, Junlang Qiu, Fuxin Wang, Wei Lin, Fang Zhu, Chaohai Wei, Ningbo Zhou, Gangfeng Ouyang
Although nanotechnology has offered effective and efficient solutions for environmental remediation, the full utilization of sustainable energy and the avoidance of secondary pollution are still challenges. Herein, we report a two-step modification strategy for TiO2 nanoparticles by first forming a thin, surface-adherent polydopamine (PDA) shell onto the nanoparticles and then assembling core-shell nanoparticles as a photodegradation coating. The composite coating modified from TiO2 could not only realize the highly efficient utilization of photons from the visible region but also avoid the secondary pollution of nanoparticles during application...
April 12, 2017: Environmental Science & Technology
Joana Madureira, Rita Melo, Andreia I Pimenta, Sandra Cabo Verde, Sueli I Borrely
Slaughterhouse industry produces large volumes of polluted wastewater which cause negative impacts to the environment. The objective of this study was to assess the effect of electron beam irradiation on the ecotoxicity of slaughterhouse effluents with absorbed doses up to 35 kGy. Two acute toxicity assays were applied to evaluate the efficiency of irradiation onto toxicity of wastewater. The exposed living organisms were a luminescent bacteria Vibrio fischeri, and a freshwater microcrustacean Daphnia similis...
March 30, 2017: Environmental Technology
L H Hayashi-Martins, A S Mansano, K F Hisatugo, O Rocha, M H R Seleghim
Cladocerans occupy an important position among the bacterial consumers in freshwater food webs, being relatively non-selective filter feeders that can exert a strong impact on microbial populations. We evaluated the bacterivory potential of three cladocerans species of subtropical and tropical occurrence (Ceriodaphnia silvestrii, Daphnia gessneri and Ceriodaphnia cornuta) at different life stages, by scanning electron microscopy (SEM) and by the quantification of their bacterial consumption rates using fluorescently labeled bacteria (FLB)...
March 16, 2017: Brazilian Journal of Biology, Revista Brasleira de Biologia
Mary Alta Rogalski
Human environmental impacts have driven some of the strongest and fastest phenotypic changes recorded in wild animal populations. Across populations, this variation is often adaptive, because populations evolve fitness advantages in response to human-modified environments. Yet some populations fail to adapt to changing environments. Evidenced by declines in relative fitness, such seemingly maladaptive outcomes are less common but may be more likely in human-modified contexts. Further, our ability to investigate the dynamics of these adaptive and maladaptive responses over time is typically limited in natural systems...
April 2017: American Naturalist
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