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Aquatic Toxicology

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https://www.readbyqxmd.com/read/28324829/interactive-effects-of-an-insecticide-and-a-fungicide-on-different-organism-groups-and-ecosystem-functioning-in-a-stream-detrital-food-web
#1
Mohab Dawoud, Mirco Bundschuh, Willem Goedkoop, Brendan G McKie
Freshwater ecosystems are often affected by cocktails of multiple pesticides targeting different organism groups. Prediction and evaluation of the ecosystem-level effects of these mixtures is complicated by the potential not only for interactions among the pesticides themselves, but also for the pesticides to alter biotic interactions across trophic levels. In a stream microcosm experiment, we investigated the effects of two pesticides targeting two organism groups (the insecticide lindane and fungicide azoxystrobin) on the functioning of a model stream detrital food web consisting of a detritivore (Ispoda: Asellus aquaticus) and microbes (an assemblage of fungal hyphomycetes) consuming leaf litter...
March 9, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28324828/evaluation-of-dna-damage-and-physiological-responses-in-nile-tilapia-oreochromis-niloticus-linnaeus-1758-exposed-to-sub-lethal-diclofenac-dcf
#2
Pramod K Pandey, Malachy N O Ajima, Kundan Kumar, Nalini Poojary, Saurav Kumar
The frequent bioaccumulation of pharmaceuticals in the aquatic ecosystem has raised a concern about their possible ecotoxicological consequences. DNA damage, haematological changes and activities of oxidative stress enzymes in Nile tilapia, Oreochromis niloticus in response to diclofenac (DCF) exposure were investigated for up to 60 days at the concentrations of 0.17, 0.34 and 0.68mgL(-1) in the fish liver. Evaluation of genotoxic effects of the drug in the liver, using single-cell gel electrophoresis, showed DNA damage on exposure at the concentrations of 0...
March 8, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28315825/effects-of-florida-red-tides-on-histone-variant-expression-and-dna-methylation-in-the-eastern-oyster-crassostrea-virginica
#3
Rodrigo Gonzalez-Romero, Victoria Suarez-Ulloa, Javier Rodriguez-Casariego, Daniel Garcia-Souto, Gabriel Diaz, Abraham Smith, Juan Jose Pasantes, Gary Rand, Jose M Eirin-Lopez
Massive algal proliferations known as Harmful Algal Blooms (HABs) represent one of the most important threats to coastal areas. Among them, the so-called Florida Red Tides (FRTs, caused by blooms of the dinoflagellate Karenia brevis and associated brevetoxins) are particularly detrimental in the southeastern U.S., causing high mortality rates and annual losses in excess of $40 million. The ability of marine organisms to cope with environmental stressors (including those produced during HABs) is influenced by genetic and epigenetic mechanisms, the latter resulting in phenotypic changes caused by heritable modifications in gene expression, without involving changes in the genetic (DNA) sequence...
March 7, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28284152/characterization-of-zinc-stress-response-in-cyanobacterium-synechococcus-sp-iu-625
#4
Robert Newby, Lee H Lee, Jose L Perez, Xin Tao, Tinchun Chu
The ability of cyanobacteria to survive many environmental stress factors is a testament to their resilience in nature. Of these environmental stress factors, overexposure to zinc is important to study since excessive zinc intake can be a severe hazard. Zinc toxicity in freshwater has been demonstrated to affects organisms such as invertebrates, algae and cyanobacteria. Cyanobacteria which possess increased resistance to zinc have been isolated. It is therefore important to elucidate the mechanism of survival and response to determine what factors allow their survival; as well as any remediation implications they may have...
March 4, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28284154/contribution-of-g-protein-coupled-estrogen-receptor-1-gper-to-17%C3%AE-estradiol-induced-developmental-toxicity-in-zebrafish
#5
Graciel Diamante, Norma Menjivar-Cervantes, Man Sin Leung, David C Volz, Daniel Schlenk
Exposure to 17β-estradiol (E2) influences the regulation of multiple signaling pathways, and E2-mediated disruption of signaling events during early development can lead to malformations such as cardiac defects. In this study, we investigated the potential role of the G-protein estrogen receptor 1 (GPER) in E2-induced developmental toxicity. Zebrafish embryos were exposed to E2 from 2h post fertilization (hpf) to 76 hpf with subsequent transcriptional measurements of heart and neural crest derivatives expressed 2 (hand2), leucine rich repeat containing 10 (lrrc10), and gper at 12, 28 and 76 hpf...
March 2, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28284153/survival-reproduction-growth-and-parasite-resistance-of-aquatic-organisms-exposed-on-site-to-wastewater-treated-by-advanced-treatment-processes
#6
Lisa Schlüter-Vorberg, Gregor Knopp, Peter Cornel, Thomas Ternes, Anja Coors
Advanced wastewater treatment technologies are generally known to be an effective tool for reducing micropollutant discharge into the aquatic environment. Nevertheless, some processes such as ozonation result in stable transformation products with often unknown toxicity. In the present study, whole effluents originating from nine different steps of advanced treatment combinations were compared for their aquatic toxicity. Assessed endpoints were survival, growth and reproduction of Lumbriculus variegatus, Daphnia magna and Lemna minor chronically exposed in on-site flow-through tests based on standard guidelines...
March 2, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28282621/uranium-238-u-induced-ros-and-cell-cycle-perturbations-antioxidant-responses-and-erythrocyte-nuclear-abnormalities-in-the-freshwater-iridescent-shark-fish-pangasius-sutchi
#7
Sathesh Kumar Annamalai, Kantha Deivi Arunachalam
The strategic plan of this study is to analyze any possible radiological impact on aquatic organisms from forthcoming uranium mining facilities around the Nagarjuna Sagar Dam in the future. The predominantly consumed and dominant fish species Pangasius sutchi, which is available year-round at Nagarjuna Sagar Dam, was selected for the study. To comprehend the outcome and to understand the mode of action of (238)U, the fish species Pangasius sutchi was exposed to ¼ and ½ of the LC50 doses of waterborne (238)U in a static system in duplicate for 21 days...
March 2, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28282619/the-use-of-mrp1-deficient-danio-rerio-zebrafish-embryos-to-investigate-the-role-of-mrp1-in-the-toxicity-of-cadmium-chloride-and-benzo-a-pyrene
#8
Jingjing Tian, Jia Hu, Mingli Chen, Huancai Yin, Peng Miao, Pengli Bai, Jian Yin
Previous studies in our lab have revealed that both P-glycoprotein (Pgp) and multi-resistance associated protein (Mrp) 1 played important roles in the detoxification of heavy metals and polycyclic aromatic hydrocarbon (PAH) in zebrafish embryos. This paper aims to extend this research by using mrp1-deficient model to illustrate the individual function of Mrp1. In this respect, CRISPR/Cas9 system was employed to generate a frameshift mutation in zebrafish mrp1 causing premature translational stops in Mrp1. Significant reduction on the efflux function of Mrps was found in mutant zebrafish embryos, which correlated well with the significantly enhanced accumulation and toxicity of cadmium chloride (CdCl2) and benzo[a]pyrene (BαP), indicating the protective role of the corresponding protein...
March 2, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28282618/integrating-multiple-stressors-across-life-stages-and-latitudes-combined-and-delayed-effects-of-an-egg-heat-wave-and-larval-pesticide-exposure-in-a-damselfly
#9
Szymon Sniegula, Lizanne Janssens, Robby Stoks
To understand the effects of pollutants in a changing world we need multistressor studies that combine pollutants with other stressors associated with global change such as heat waves. We tested for the delayed and combined impact of a heat wave during the egg stage and subsequent sublethal exposure to the pesticide esfenvalerate during the larval stage on life history and physiology in the larval and adult stage of the damselfly Lestes sponsa. We studied this in a common garden experiment with replicated central- and high latitude populations to explore potential effects of local thermal adaptation and differences in life history shaping the multistressor responses...
March 1, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28282622/the-effects-of-fipronil-and-the-photodegradation-product-fipronil-desulfinyl-on-growth-and-gene-expression-in-juvenile-blue-crabs-callinectes-sapidus-at-different-salinities
#10
Andrew D Goff, Parichehr Saranjampour, Lauren M Ryan, Michelle L Hladik, Joseph A Covi, Kevin L Armbrust, Susanne M Brander
Endocrine disrupting compounds (EDCs) are now widely established to be present in the environment at concentrations capable of affecting wild organisms. Although many studies have been conducted in fish, less is known about effects in invertebrates such as decapod crustaceans. Decapods are exposed to low concentrations of EDCs that may cause infertility, decreased growth, and developmental abnormalities. The objective herein was to evaluate effects of fipronil and its photodegradation product fipronil desulfinyl...
February 28, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28267650/toxic-effects-of-56-fe-ion-radiation-on-the-zebrafish-danio-rerio-embryonic-development
#11
Jing Si, Rong Zhou, Jing'e Song, Lu Gan, Xin Zhou, Cuixia Di, Yang Liu, Aihong Mao, Qiuyue Zhao, Yupei Wang, Hong Zhang
All living organisms and ecosystems are permanently exposed to ionizing radiation. Of all the types of ionizing radiation, heavy ions such as (56)Fe have the potential to cause the most severe biological effects. We therefore examined the effects and potential mechanisms of iron ion irradiation on the induction of developmental toxicity and apoptosis in zebrafish embryos. Zebrafish embryos at 4h post-fertilization (hpf) were divided into five groups: a control group; and four groups irradiated with 0.5, 1, 2, and 4Gy radiation, respectively...
February 28, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28285196/influence-of-surfactants-and-humic-acids-on-artemia-franciscana-s-embryonic-phospho-metabolite-profile-as-measured-by-31-p-nmr
#12
Rachel D Deese, Thomas K Weldeghiorghis, Benjamin J Haywood, Robert L Cook
Surfactants, such as triton X-100 (Tx-100), cetylpyridinium chloride (CPC), and sodium dodecyl sulfate (SDS) are known to be toxic to Artemia Franciscana (Artemia) - an organism, frequently used to monitor the health of the aquatic environment . The phospho-metabolite profile of a living organism is often indicative of imbalances that may have been caused by environmental stressors, such as surfactants. This study utilizes i n vivo(31)P NMR to monitor temporal changes in the phospho-metabolite profile of Artemia caused by Tx-100, CPC, and SDS and the ability of humic acid (HA) to mitigate the toxicity of these surfactants...
February 27, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28282617/adverse-effects-of-bde-47-on-life-cycle-parameters-antioxidant-system-and-activation-of-mapk-signaling-pathway-in-the-rotifer-brachionus-koreanus
#13
Jun Chul Park, Jeonghoon Han, Min-Chul Lee, Hye-Min Kang, Chang-Bum Jeong, Dae-Sik Hwang, Minghua Wang, Jae-Seong Lee
2,2',4,4'-Tetrabromodiphenyl ether (BDE-47) is widely dispersed endocrine disrupting chemicals (EDCs) in the aquatic ecosystem. Due to its devastating effect on marine organisms and insufficient database on toxicology, we investigated the adverse effects of BDE-47 on life parameters and antioxidant defense system following the reactive oxygen species (ROS) production in the monogonont rotifer Brachionus koreanus. In B. koreanus, the reduction in life cycle, fecundity, and population growth were observed in response to BDE-47...
February 27, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28257901/effect-of-florfenicol-and-thiamphenicol-exposure-on-the-photosynthesis-and-antioxidant-system-of-microcystis-flos-aquae
#14
Meixian Wang, Yuxuan Zhang, Peiyong Guo
Florfenicol (FF) and thiamphenicol (TAP) are two typical pharmaceuticals used widely as therapeutica antibiotic agents in aquaculture. However, little is known about the potential adverse effects of these two antibiotics on non-target organisms in the aquatic ecosystem. In this study we investigated the effects of FF and TAP on photosynthesis and the antioxidant system of the cyanobacteria Microcystis flos-aquae. Over a concentration range of 0.001-1μg/L, the results showed that both FF and TAP significantly increased the chlorophyll a content of M...
February 22, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28249228/calcium-mediates-the-cellular-response-of-chlamydomonas-reinhardtii-to-the-emerging-aquatic-pollutant-triclosan
#15
Miguel González-Pleiter, Carmen Rioboo, María Reguera, Isidro Abreu, Francisco Leganés, Ángeles Cid, Francisca Fernández-Piñas
The present study was aimed at investigating the role of intracellular free calcium, [Ca(2+)]c, in the early cellular response of the green alga Chlamydomonas reinhardtii to the emergent pollutant Triclosan (13.8μM; 24h of exposure). There is a growing concern about the persistence and toxicity of this antimicrobial in aquatic environments, where non-target organisms such as C. reinhardtii, a primary producer of ecological relevance, might be severely impacted. A mechanistic study was undertaken which combined flow cytometry protocols, physiological as well as gene expression analysis...
February 22, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28249227/effects-of-food-borne-exposure-of-juvenile-rainbow-trout-oncorhynchus-mykiss-to-emerging-brominated-flame-retardants-1-2-bis-2-4-6-tribromophenoxy-ethane-and-2-ethylhexyl-2-3-4-5-tetrabromobenzoate
#16
Maeva Giraudo, Mélanie Douville, Robert J Letcher, Magali Houde
Brominated flame retardants (BFRs) represent a large group of chemicals used in a variety of household and commercial products to prevent fire propagation. The environmental persistence and toxicity of some of the most widely used BFRs has resulted in a progressive ban worldwide and the development of novel BFRs for which the knowledge on environmental health impacts remains limited. The objectives of this study were to evaluate the effects of two emerging BFRs, 1,2-bis(2,4,6-tribromophenoxy)ethane (BTBPE) and 2-ethylhexyl-2,3,4,5-tetrabromobenzoate (EH-TBB), in diet exposed juvenile rainbow trout (Oncorhynchus mykiss)...
February 22, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28282620/a-3d-fish-liver-model-for-aquatic-toxicology-morphological-changes-and-cyp1a-induction-in-plhc-1-microtissues-after-repeated-benzo-a-pyrene-exposures
#17
April L Rodd, Norma J Messier, Charles A Vaslet, Agnes B Kane
To identify the potential environmental impacts of aquatic pollutants, rapid and sensitive screening tools are needed to assess adaptive and toxic responses. This study characterizes a novel fish liver microtissue model, produced with the cell line PLHC-1, as an in vitro aquatic toxicity testing platform. These 3D microtissues remain viable and stable throughout the 8-day testing period and relative to 2D monolayers, show increased basal expression of the xenobiotic metabolizing enzyme cytochrome P450 1A (Cyp1a)...
February 21, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28249226/molecular-effectors-in-the-chronic-exposure-to-arsenic-as-early-and-sensitive-biomarkers-in-developing-rhinella-arenarum-toads
#18
Mariana Noelia Mardirosian, Danilo Guillermo Ceschin, Cecilia Inés Lascano, Andrés Venturino
Arsenic, a natural element of ecological relevance, is one of the most toxic elements present in various regions of the world. It can be found in natural water sources throughout Argentina in concentrations between 0.01 and 15mgL(-1). The Argentinean autochthonous toad Rhinella arenarum was selected to study the molecular mechanisms involved in the effects and response to the chronic As exposure along its embryonic and larval development. We evaluated the effects on MAPK signal transduction pathway and transcription factors c-FOS and c-JUN, and the regulation of the expression at protein levels of different antioxidant enzymes...
February 21, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28237603/embryonic-only-arsenic-exposure-in-killifish-fundulus-heteroclitus-reduces-growth-and-alters-muscle-igf-levels-one-year-later
#19
Dana B Szymkowicz, Kaleigh C Sims, Noemi M Castro, William C Bridges, Lisa J Bain
Arsenic is a contaminant of drinking water and crops in many parts of the world. Epidemiological studies have shown that arsenic exposure is linked to decreased birth weight, weight gain, and proper skeletal muscle function. The goal of this study was to use killifish (Fundulus heteroclitus) as a model to determine the long-term effects of embryonic-only arsenic exposure on muscle growth and the insulin-like growth factor (IGF) pathway. Killifish embryos were exposed to 0, 50, 200 or 800ppb As(III) from fertilization until hatching...
February 20, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28246045/characterisation-of-the-transcriptome-of-male-and-female-wild-type-guppy-brains-with-rna-seq-and-consequences-of-exposure-to-the-pharmaceutical-pollutant-17%C3%AE-ethinyl-estradiol
#20
Minna Saaristo, Bob B M Wong, Laura Mincarelli, Allison Craig, Christopher P Johnstone, Mayumi Allinson, Kai Lindström, John A Craft
Waterways are increasingly being contaminated by chemical compounds that can disrupt the endocrinology of organisms. One such compound is 17α-ethinyl estradiol (EE2), a synthetic estrogen used in the contraceptive pill. Despite considerable research interest in the effects of EE2 on reproduction and gene expression, surprisingly, only a few studies have capitalised on technologies, such as next-generation sequencing (NGS), to uncover the molecular pathways related to EE2 exposure. Accordingly, using high-throughput sequencing technologies, the aim of our study was to explore the effects of EE2 on brain transcriptome in wild-type male and female guppy (Poecilia reticulata)...
February 16, 2017: Aquatic Toxicology
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