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Aquatic Toxicology

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https://www.readbyqxmd.com/read/30243048/morphological-and-molecular-effects-of-two-diluted-bitumens-on-developing-fathead-minnow-pimephales-promelas
#1
F M Alsaadi, B N Madison, R S Brown, P V Hodson, V S Langlois
Canada has experienced a significant increase in the transport of diluted bitumen (dilbit), a predominant oil sands product that combines bitumen with diluents derived from oil-gas condensates and other proprietary compounds. The toxicity of dilbit to fish embryos, which are immobile and thus at a high risk of exposure to oil in the event of a spill, remains largely unknown for most species. This study assessed the toxicity of water accommodated fractions (WAF) and chemically enhanced water accommodated fractions (CEWAF) of two winter dilbit blends, Access Western Blend (AWB) and Cold Lake Blend (CLB), to fathead minnow (Pimephales promelas) embryos...
September 10, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30223188/deepwater-horizon-oil-alone-and-in-conjunction-with-vibrio-anguillarum-exposure-modulates-immune-response-and-growth-in-red-snapper-lutjanus-campechanus
#2
Maria L Rodgers, Ryan Takeshita, Robert J Griffitt
This study examined the impacts of Macondo oil from the Deepwater Horizon oil spill, both alone and in conjunction with exposure to the known fish pathogen Vibrio anguillarum, on the expression of five immune-related gene transcripts of red snapper (il8, il10, tnfa, il1b, and igm). In order to elucidate this impact, six different test conditions were used: one Control group (No oil/No pathogen), one Low oil/No pathogen group (tPAH50 = 0.563 μg/L), one High oil/No pathogen group (tPAH50 = 17.084 μg/L, one No oil/Pathogen group, one Low oil/Pathogen group (tPAH50 = 0...
September 8, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30205248/toxic-effects-of-nickel-oxide-nio-nanoparticles-on-the-freshwater-alga-pseudokirchneriella-subcapitata
#3
Cátia A Sousa, Helena M V M Soares, Eduardo V Soares
Over the last decade, concerns have been raised regarding the potential health and environmental effects associated with the release of metal oxide nanoparticles (NPs) into ecosystems. In the present work, the potential hazards of nickel oxide (NiO) NPs were investigated using the ecologically relevant freshwater alga Pseudokirchneriella subcapitata. NiO NP suspensions in algal OECD medium were characterized with regard to their physicochemical properties: agglomeration, surface charge, stability (dissolution of the NPs) and abiotic reactive oxygen species (ROS) production...
September 1, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30227300/effects-of-zinc-pyrithione-on-biochemical-parameters-of-the-freshwater-asian-clam-corbicula-fluminea
#4
Ana Filipa Nogueira, Joana Luísa Pereira, Sara Cristina Antunes, Fernando J M Gonçalves, Bruno Nunes
Zinc pyrithione (ZnPT) is an organometallic biocide with bactericide, algaecide, and fungicide activity. Considering this biological activity, ZnPT has been used in anti-fouling paints, and also in human therapeutics and cosmetics, in shampoos to treat dandruff and seborrhoea. Despite its potential uses and consequent presence in the aquatic environment, the ecotoxicological effects of ZnPT are poorly understood. This work aims to characterise the effects of ZnPT in biochemical parameters of the Asian clam, one of the most invasive bivalves known for its biofouling action in hydro-dependent industries, using a classical (LC50 determination) and a biomarker-based approach (quantification of the activities of catalase, GSTs, and acetylcholinesterase, and also the muscle glycogen content)...
August 30, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30189351/comparative-transcriptome-analysis-between-the-short-term-stress-and-long-term-adaptation-of-the-ruditapes-philippinarum-in-response-to-benzo-a-pyrene
#5
Hongdan Wang, Luqing Pan, Ruiyi Xu, Jingjing Miao, Lingjun Si, Luqing Pan
In order to monitor the pollution of polycyclic aromatic hydrocarbons (PAHs) in the seawater environment, screening biomarkers capable of monitoring PAHs is the focus of many studies. The transcriptomic profiles of the digestive gland tissue from the R. philippinarum groups after the exposure to BaP (4 μg/L) at four time points (0, 0.5, 6 and 15 days) were investigated to globally screen the key genes and pathways involved in the responses to short-term stress and long-term adaptation of BaP resistance. By comparative transcriptome analysis, 233, 282 and 58 differentially expressed genes (DEGs) were identified at 0...
August 28, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30189350/do-trace-metal-contamination-and-parasitism-influence-the-activities-of-the-bioturbating-mud-shrimp-upogebia-cf-pusilla
#6
Annabelle Dairain, Xavier de Montaudouin, Patrice Gonzalez, Aurélie Ciutat, Magalie Baudrimont, Olivier Maire, Alexia Legeay
Mud shrimp are considered as among the most influential ecosystem engineers in marine soft bottom environments because of their significant bioturbation activity and their high density. These organisms play a key role on the physical structure of sediments through intense sediment reworking activity and also deeply influence geochemical properties of sediments via frequent bioirrigation events. The influence that mud shrimp have on the environment is related to the magnitude of bioturbation processes and subsequently depends on their physiological condition...
August 28, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30189352/adverse-effects-of-two-pharmaceuticals-acetaminophen-and-oxytetracycline-on-life-cycle-parameters-oxidative-stress-and-defensome-system-in-the-marine-rotifer-brachionus-rotundiformis
#7
Jun Chul Park, Deok-Seo Yoon, Eunjin Byeon, Jung Soo Seo, Un-Ki Hwang, Jeonghoon Han, Jae-Seong Lee
To investigate the adverse effect of two widely used pharmaceuticals, paracetamol (acetaminophen [APAP]) and oxytetracycline (OTC) on the marine rotifer Brachionus rotundiformis (B. rotundiformis), the animals were exposed to various environmentally-relevant concentrations. Up to date, acetaminophen and oxytetracycline have been considered as toxic, if used above threshold concentration, i.e. overdosed. However, this study demonstrated these two pharmaceuticals even at low concentration (i.e., μg/L scale) elicited oxidative stress through the generation of reactive oxygen species (ROS) along with the increased glutathione S-transferase activity, despite no-observed effect in in-vivo population growth...
August 27, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30173120/monitoring-sublethal-changes-in-fish-physiology-following-exposure-to-a-light-unweathered-crude-oil
#8
Sharon E Hook, Julie Mondon, Andrew T Revill, Paul A Greenfield, Sarah A Stephenson, Joanna Strzelecki, Patricia Corbett, Emily Armstrong, Jing Song, Hai Doan, Skye Barrett
Biomarkers are frequently used to determine the exposure of fish to petroleum hydrocarbons following an oil spill. These biomarkers must be chosen carefully if they are to be used to determine sublethal toxic impacts as well as oil exposure. Many commonly used biomarkers relate to the metabolism of high molecular weight, typically pyrogenic, polycyclic aromatic hydrocarbons (PAHs), which are not abundant in unweathered crude oil. The goal of this study was to compare the efficacy of different biomarkers, including histological examination and transcriptomic profiling, in showing exposure to oil and the potential for sublethal toxic impacts...
August 24, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30170209/the-role-of-gst-omega-in-metabolism-and-detoxification-of-arsenic-in-clam-ruditapes-philippinarum
#9
Lizhu Chen, Huifeng Wu, Jianmin Zhao, Wei Zhang, Li Zhang, Shan Sun, Dinglong Yang, Bo Cheng, Qing Wang
The major hazard of arsenic in living organisms is increasingly being recognized. Marine mollusks are apt to accumulate high levels of arsenic, but knowledge related to arsenic detoxification in marine mollusks is still less than sufficient. In this study, arsenic bioaccumulation as well as the role of glutathione S-transferase omega (GSTΩ) in the process of detoxification were investigated in the Ruditapes philippinarum clam after waterborne exposure to As(III) or As(V) for 30 days. The results showed that the gills accumulated significantly higher arsenic levels than the digestive glands...
August 23, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30153596/age-dependent-survival-stress-defense-and-ampk-in-daphnia-pulex-after-short-term-exposure-to-a-polystyrene-nanoplastic
#10
Zhiquan Liu, Mingqi Cai, Ping Yu, Minghai Chen, Donglei Wu, Meng Zhang, Yunlong Zhao
The widespread occurrence and accumulation of micro- and nanoplastics in aquatic environments has become a growing global concern. Generally, natural aquatic populations are characterized by a variety of multi-structured age groups, for which physiological and biochemical responses typically differ. The freshwater cladoceran, Daphnia pulex, is a model species used extensively in environmental monitoring studies and ecotoxicology testing. Here, the effects of a polystyrene nanoplastic on the physiological changes (i...
August 23, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30170208/environmental-risks-of-zno-nanoparticle-exposure-on-microcystis-aeruginosa-toxic-effects-and-environmental-feedback
#11
Yulin Tang, Huaijia Xin, Shu Yang, Meiting Guo, Tyler Malkoske, Daqiang Yin, Shengji Xia
The vast majority of studies measure the toxic effect of organisms exposed to nanoparticles (NPs) while there is still a lack of knowledge about the influence of NPs on the aquatic environment. It is unknown whether or not the interaction between NPs and algae will result in the variation of algal organic matter (AOM) and stimulate the production of more algal toxins. In this study, zinc oxide nanoparticles (nano-ZnO) as a typical representative of metal oxide NPs were used to evaluate the toxic effects and environmental feedback of Microcystis aeruginosa...
August 16, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30165313/social-competition-in-red-drum-sciaenops-ocellatus-is-influenced-by-crude-oil-exposure
#12
Alexis J Khursigara, Jacob L Johansen, Andrew J Esbaugh
The present study examined impacts of crude oil exposure on dyad competition in juvenile red drum. Following the 2010 Deepwater Horizon oil spill, it has become well established that oil exposure can constrain maximum metabolic rate, reduce aerobic scope and exercise performance in marine fish. Aerobic scope is one of the physiological characteristics that is a known determinant of dominance in fish social hierarchy formation. As such, oil exposure may predispose individuals to subordinate social status, complete with the concomitant ecological costs...
October 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30153560/blinded-by-the-light-increased-chlorophyll-fluorescence-of-herbicide-exposed-periphyton-masks-unfavorable-structural-responses-during-exposure-and-recovery
#13
Alexander Feckler, Jelena Rakovic, Maria Kahlert, Rikard Tröger, Mirco Bundschuh
In surface waters within agricultural catchments, periphyton - i.e., biofilms containing algae, heterotrophs, and associated detritus - is subjected to multiple stressors including herbicides. Although herbicide effects on periphyton are frequently studied, the focus has been on photosynthesis-inhibiting herbicides while other modes of toxic action have received little attention. Against this background, a 21-days-lasting bioassay was conducted, during which mature periphytic communities were exposed to the carotenoid-biosynthesis-inhibiting herbicide diflufenican for 12 days (up to 10 μg/L; n = 4), followed by a 9-days-lasting recovery phase in herbicide-free medium...
October 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30153559/hexavalent-chromium-induces-oxidative-stress-and-mitochondria-mediated-apoptosis-in-isolated-skin-fibroblasts-of-indo-pacific-humpback-dolphin
#14
Xinjian Yu, Ri-Qing Yu, Duan Gui, Xiyang Zhang, Fenping Zhan, Xian Sun, Yuping Wu
The increasing gas emissions and industrial wastewater discharge of anthropogenic hexavalent chromium (Cr(VI)) have been growing health concerns to the high trophic level marine mammals. Our previous studies showed that Indo-Pacific humpback dolphin (Sousa chinensis), stranded on the Pearl River Estuary region, contained exceedingly high levels of Cr in their skin-tissues. Unfortunately, the molecular toxic mechanisms on this mammal are absent, limiting our understanding of the eco-physiological impacts of Cr(VI) on dolphins...
October 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30138801/uv-b-radiation-induces-dehp-degradation-and-their-combined-toxicological-effects-on-scenedesmus-acuminatus
#15
Chao Zhang, Mu Xie, Jing Chen, Yurui Zhang, Sijie Wei, Xinyue Ma, Ling Xiao, Lanzhou Chen
The co-contamination discharge of Phthalate esters (PAEs) by human activities and the increased UV radiation is increasing in aquatic ecosystems. However, little information is available about the combined detrimental effects of UV and PAEs on phytoplankton. In this study, the combined effects of UV-B irradiation and di-(2-ethylhexyl) phthalate (DEHP) on photosynthesis and antioxidant system of Scenedesmus acuminatus, and the DEHP degradation were investigated. Results showed that UV-B radiation decreased the chlorophyll a fluorescence yield, photosynthetic activity (Fv/Fm), pigment content and superoxide dismutase activity...
October 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30138800/testing-wastewater-treatment-plant-effluent-effects-on-microbial-and-detritivore-performance-a-combined-field-and-laboratory-experiment
#16
Libe Solagaistua, Ioar de Guzmán, Miren Barrado, Leire Mijangos, Nestor Etxebarria, Gonzalo García-Baquero, Aitor Larrañaga, Daniel von Schiller, Arturo Elosegi
The amount of pollutants and nutrients entering rivers via point sources is increasing along with human population and activity. Although wastewater treatment plants (WWTPs) greatly reduce pollutant loads into the environment, excess nutrient loading is a problem in many streams. Using a Community and Ecosystem Function (CEF) approach, we quantified the effects of WWTP effluent on the performance of microbes and detritivores associated to organic matter decomposition, a key ecosystem process. We measured organic matter breakdown rates, respiration rates and exo-enzymatic activities of aquatic microbes...
October 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30138799/growth-energy-metabolism-and-transcriptomic-responses-in-chinese-mitten-crab-eriocheir-sinensis-to-benzo-%C3%AE-pyrene-bap-toxicity
#17
Na Yu, Qingqing Ding, Erchao Li, Jian G Qin, Liqiao Chen, Xiaodan Wang
Benzo(a)pyrene (BaP) is a highly toxic polycyclic aromatic hydrocarbon and has strong affinity to suspended materials and sediments in the aquatic environment. Most crustaceans are benthic species and are easily affected by the pollution in the sediments, but there is little information on the response mechanism of crustaceans to BaP exposure. This study compared the growth and hepatopancreas transcriptomic responses of the Chinse mitten crab (Eriocheir sinensis) exposed to 0, 0.15 (BaP1) and 0.45 μg /L (BaP2) for 28 days...
October 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30138798/impact-of-multiple-stressors-on-biomarker-responses-in-sympatric-dreissenid-populations
#18
Marine Potet, Laure Giambérini, Sandrine Pain-Devin, Audrey Catteau, Danièle Pauly, Simon Devin
Dreissenid mussels, well-known invaders of the northern hemisphere, also constitute good biomonitors for freshwater quality assessment. Whereas the oldest, Dreissena polymorpha, is relatively well-known, the new invasive, Dreissena rostriformis bugensis, has been very little characterized. The aim of this study was to compare subcellular biomarker responses within these species, by taking into account inter- and intra-specific variability in biomarker responses during a multi-stress assessment. Indeed, due to local environmental conditions and genetic background, biomarker responses can be different between populations of a given species, not only between species...
October 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30125766/oxidative-stress-responses-and-cellular-energy-allocation-changes-in-microalgae-following-exposure-to-widely-used-human-antibiotics
#19
Adeolu O Aderemi, Sara C Novais, Marco F L Lemos, Luís M Alves, Colin Hunter, Ole Pahl
The individual effect of four human antibiotics on the microalgae Raphidocelis subcapitata was investigated following a 120-h exposure. The effects were assessed by analyzing growth, and biochemical parameters related with: 1) antioxidant capacity and oxidative damage by measuring superoxide dismutase (SOD) activity and lipid peroxidation (LPO) levels; and 2) cellular energy allocation (CEA) by quantifying the content in energy reserves, which represents the energy available (Ea), and the electron transport system activity that represents a measure of oxygen and cellular energy consumption (Ec)...
October 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30119036/impacts-of-the-combined-exposure-to-seawater-acidification-and-arsenic-on-the-proteome-of-crassostrea-angulata-and-crassostrea-gigas
#20
Anthony Moreira, Etelvina Figueira, Nélia C Mestre, Denise Schrama, Amadeu M V M Soares, Rosa Freitas, Maria João Bebianno
Proteomic analysis was performed to compare the effects of Arsenic (As), seawater acidification (Low pH) and the combination of both stressors (Low pH + As) on Crassostrea angulata and Crassostrea gigas juveniles in the context of global environmental change. This study aimed to elucidate if two closely related Crassostrea species respond similarly to these environmental stressors, considering both single and combined exposures, to infer if the simultaneous exposure to both stressors induced a differentiated response...
October 2018: Aquatic Toxicology
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