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Ecotoxicology

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https://read.qxmd.com/read/30874993/development-of-marine-water-quality-criteria-for-inorganic-mercury-in-china-based-on-the-retrievable-toxicity-data-and-a-comparison-with-relevant-criteria-or-guidelines
#1
Qiang Liu, Xiaoqun Xu, Jiangning Zeng, Wei Huang, Xudan Xu, Lu Shou, Quanzhen Chen
The development of marine water quality criteria (WQC) in China has been insufficient because data on the toxicity of pollutants for marine organisms based on the species sensitivity distribution (SSD) method are lacking. The Chinese aquatic environmental quality standards, including those for seawater, were derived from the developed countries. Therefore, establishing Chinese marine WQC is crucial for identifying the sensitivity of marine species in China and will improve their protection from threats. Mercury (Hg) is one of the primary pollutants commonly exceeding Chinese seawater quality standards...
March 14, 2019: Ecotoxicology
https://read.qxmd.com/read/30874992/chronic-toxicity-and-biochemical-response-of-apis-cerana-cerana-hymenoptera-apidae-exposed-to-acetamiprid-and-propiconazole-alone-or-combined
#2
Wensu Han, Yemeng Yang, Jinglin Gao, Dongxiang Zhao, Chengcai Ren, Shijie Wang, Shan Zhao, Yihai Zhong
Acetamiprid and ergosterol-inhibiting fungicide (EBI) are frequently applied to many flowering plants, while honey bees are pollinating agents or pollinators of the flowers. Hence honey bees are often exposed to these pesticides. But until now, the effects of theses combinations at field-realistic doses on honey bee health have been poorly investigated. In this study, we explore the synergistic mortality and some physiological effects in surviving honey bees after chronic oral exposure to acetamiprid and/or propiconazole in the laboratory...
March 14, 2019: Ecotoxicology
https://read.qxmd.com/read/30868349/heavy-metals-transported-through-a-multi-trophic-food-chain-influence-the-energy-metabolism-and-immune-responses-of-cryptolaemus-montrouzieri
#3
Cailian Du, Jianhui Wu, Muhammad Hamid Bashir, Mobeen Shaukat, Shaukat Ali
Contamination of environment with heavy metals is increasingly becoming an issue of major concern across the globe. Heavy metals are highly toxic to humans as well as other organisms of the ecosystem. The translocation of heavy metals from soil to predatory insects via multi-tophic food chains can influence the growth, reproduction, metabolism and innate immune systems of the predators. This study was performed to observe the changes in energy metabolism and immune responses of Cryptolaemus montrouzieri feeding on heavy metal (Cd, Pb, Ni and Zn) contaminated pink hibiscus mealybug (Dysmicoccus neobrevipes)...
March 13, 2019: Ecotoxicology
https://read.qxmd.com/read/30826955/dna-damage-exerted-by-mixtures-of-commercial-formulations-of-glyphosate-and-imazethapyr-herbicides-in-rhinella-arenarum-anura-bufonidae-tadpoles
#4
Wanessa F Carvalho, Celeste Ruiz de Arcaute, Juan Manuel Pérez-Iglesias, Milagros R R Laborde, Sonia Soloneski, Marcelo L Larramendy
Glyphosate (GLY) and imazethapyr (IMZT) are two herbicides commonly used worldwide, either alone or in mixtures. They represent key pesticides in modern agricultural management. The toxicity that results when employed as mixtures has not been characterized so far. Acute toxicity of the 48% GLY-based herbicide (GBH) Credit® and the 10.59% IMZT-based herbicide (IBH) Pivot® H alone and their binary combinations was analyzed in Rhinella arenarum tadpoles exposed in a semi-static renewal test. Lethal effects were determined using mortality as the end-point, whereas sublethal effects were determined employing the single-cell gel electrophoresis (SCGE) bioassay...
March 2, 2019: Ecotoxicology
https://read.qxmd.com/read/30826954/factors-influencing-exposure-of-north-american-river-otter-lontra-canadensis-and-american-mink-neovison-vison-to-mercury-relative-to-a-large-scale-reservoir-in-northern-british-columbia-canada
#5
Shannon M Crowley, Dexter P Hodder
Although reservoir creation increases fish mercury (Hg) concentrations, little information exists on its effects on Hg concentrations in aquatic mammals. River otters (Lontra canadensis) and American mink (Neovison vison) are two aquatic mammals that have been used as model species for assessing Hg bioaccumulation in aquatic systems. We assessed Hg and selenium (Se) concentrations in these two species within and outside of the Williston Reservoir (Peace-Williston (PW) watershed) in northern British Columbia (BC) and used these data to investigate potential explanatory factors (i...
March 2, 2019: Ecotoxicology
https://read.qxmd.com/read/30826953/the-novel-pesticide-flupyradifurone-sivanto-affects-honeybee-motor-abilities
#6
Hannah Hesselbach, Ricarda Scheiner
Honeybees and other pollinators are threatened by changing landscapes and pesticides resulting from intensified agriculture. In 2018 the European Union prohibited the outdoor use of three neonicotinoid insecticides due to concerns about pollinators. A new pesticide by the name of "Sivanto" was recently released by Bayer AG. Its active ingredient flupyradifurone binds to the nicotinic acetylcholine receptor (AchR) in the honeybee brain, similar to neonicotinoids. Nevertheless, flupyradifurone is assumed to be harmless for honeybees and can even be applied on flowering crops...
March 2, 2019: Ecotoxicology
https://read.qxmd.com/read/30790110/qsar-study-using-acute-toxicity-of-daphnia-magna-and-hyalella-azteca-through-exposure-to-polycyclic-aromatic-hydrocarbons-pahs
#7
Hongjoo Ha, Kapsong Park, Guyoung Kang, Sungjong Lee
Polycyclic aromatic hydrocarbons are organic chemicals consisting of a small number of benzene rings. PAHs are exposed to the environment by events such as Crude oil spills, even though they are substances present in the environment. Exposure of PAHs to the environment will affect not only the environment, but also the living organisms and the ecosystem as a whole. The effects of PAHs vary widely depending on the type of PAHs and have been studied for a long time. However, there are only 16 kinds of PAHs defined by US EPA, and there are more kinds of PAHs present in the environment...
February 21, 2019: Ecotoxicology
https://read.qxmd.com/read/30790109/impacts-of-sulfanilamide-and-oxytetracycline-on-methane-oxidation-and-methanotrophic-community-in-freshwater-sediment
#8
Tianli Tong, Shuguang Xie
Methanotrophs are of great significance for the abatement of methane emission from anoxic environments. Antibiotics are ubiquitous in the environment and can affect microbial activity and community density and composition. However, information about the effect of antibiotics on methanotrophs is still lacking. The current study explored the influences of sulfonamides and tetracyclines on methane oxidation potential (MOP) and methanotrophic density and community structure in freshwater sediment microcosms. The addition of both sulfanilamide (SA) and oxytetracycline (OTC) could increase MOP and particulate methane monooxygenase subunit A (pmoA) gene density but decrease the number of pmoA transcripts...
February 21, 2019: Ecotoxicology
https://read.qxmd.com/read/30863973/ecotoxicity-of-rare-earths-in-the-marine-mussel-mytilus-galloprovincialis-and-a-preliminary-approach-to-assess-environmental-risk
#9
Nélia C Mestre, Vânia Serrão Sousa, Thiago Lopes Rocha, Maria João Bebianno
The increasing use of rare earth elements (REEs) in diverse technological applications has augmented the demand and exploitation of these worldwide, leading to a higher input of REEs + Yttrium (Y) in the marine environment. The present study investigated the ecotoxicity of Lanthanum (La) and Y to Mytilus galloprovincialis developing embryos and juveniles. This was achieved by quantifying the embryogenesis success after 48 h, and survival of juveniles after 96 h of exposure to different concentrations of La and Y...
February 15, 2019: Ecotoxicology
https://read.qxmd.com/read/30761431/feather-mercury-concentrations-in-north-american-raptors-sampled-at-migration-monitoring-stations
#10
Ryan P Bourbour, Breanna L Martinico, Joshua T Ackerman, Mark P Herzog, Angus C Hull, Allen M Fish, Joshua M Hull
We assessed total mercury (THg) concentrations in breast feathers of diurnal North American raptors collected at migration monitoring stations. For 9 species in the Pacific Flyway, we found species and age influenced feather THg concentrations whereas sex did not. Feather THg concentrations µg/g dry weight (dw) averaged (least squares mean ± standard error) higher for raptors that generally consume > 75% avian prey (sharp-shinned hawk Accipiter striatus: n = 113; 4.35 ± 0.45 µg/g dw, peregrine falcon Falco peregrinus: n = 12; 3...
February 13, 2019: Ecotoxicology
https://read.qxmd.com/read/30761430/silicon-induced-antioxidant-defense-and-methylglyoxal-detoxification-works-coordinately-in-alleviating-nickel-toxicity-in-oryza-sativa-l
#11
Mirza Hasanuzzaman, Md Mahabub Alam, Kamrun Nahar, Sayed Mohammad Mohsin, M H M Borhannuddin Bhuyan, Khursheda Parvin, Barbara Hawrylak-Nowak, Masayuki Fujita
Nickel (Ni), an essential nutrient of plant but very toxic to plant at supra-optimal concentration that causes inhibition of seed germination emergence and growth of plants as a consequence of physiological disorders. Hence, the present study investigates the possible mechanisms of Ni tolerance in rice seedlings by exogenous application of silicon (Si). Thirteen-day-old hydroponically grown rice (Oryza sativa L. cv. BRRI dhan54) were treated with Ni (NiSO4 .7H2 O, 0.25 and 0.5 mM) sole or in combination with 0...
February 13, 2019: Ecotoxicology
https://read.qxmd.com/read/30761429/role-of-supplemental-uv-b-in-changing-the-level-of-ozone-toxicity-in-two-cultivars-of-sunflower-growth-seed-yield-and-oil-quality
#12
Ruchika Tripathi, Kshama Rai, Suruchi Singh, Madhoolika Agrawal, S B Agrawal
Ultraviolet-B radiation (UV-B) is inherent part of solar spectrum and tropospheric ozone (O3 ) is a potent secondary air pollutant. Therefore the present study was conducted to evaluate the responses of Helianthus annuus L. cvs DRSF 108 and Sungold (sunflower) to supplemental UV-B (sUV-B; ambient + 7.2 kJ m-2  d-1 ) and elevated ozone (O3 ; ambient + 10 ppb), given singly and in combination under field conditions using open-top chambers. The individual and interactive effects of O3 and sUV-B induced varying changes in both the cultivars of sunflower ranging from ultrastructural variations to growth, biomass, yield and oil composition...
February 13, 2019: Ecotoxicology
https://read.qxmd.com/read/30761428/mercury-accumulation-speciation-and-temporal-trends-in-atlantic-stingrays-hypanus-sabinus
#13
Brianne K Soulen, Douglas H Adams, Aaron P Roberts
Mercury (Hg) deposited into aquatic sediments can be converted into the more toxic methylmercury (MeHg) by microbial activity. Atlantic stingrays (Hypanus sabinus) are an estuarine and nearshore species found in coastal regions of the western North Atlantic, occurring in multiple habitat types, and feeding mainly on benthic invertebrates. Mercury dynamics and speciation in stingrays have not been well examined. This study quantified total Hg and Hg species (Hg (II) and MeHg) in Atlantic stingrays sampled from Florida's Indian River Lagoon (IRL) from 2012 to 2013...
February 13, 2019: Ecotoxicology
https://read.qxmd.com/read/30758729/bioreduction-of-toxicity-influenced-by-bioactive-molecules-secreted-under-metal-stress-by-azotobacter-chroococcum
#14
Asfa Rizvi, Bilal Ahmed, Almas Zaidi, Mohd Saghir Khan
Heavy metal pollution destruct soil microbial compositions and functions, plant's performance and subsequently human health. Culturable microbes among many metal abatement strategies are considered inexpensive, viable and environmentally safe. In this study, nitrogen fixing bacterial strain CAZ3 recovered from chilli rhizosphere tolerated 100, 1000 and 1200 µg mL-1 of cadmium, chromium and nickel, respectively and was identified as Azotobacter chroococcum by 16S rDNA sequence analysis. Under metal stress, cellular morphology of A...
February 13, 2019: Ecotoxicology
https://read.qxmd.com/read/30758728/effects-of-bistrifluron-resistance-on-the-biological-traits-of-spodoptera-litura-fab-noctuidae-lepidoptera
#15
Qian Huang, Xuegui Wang, Xinge Yao, Changwei Gong, Litao Shen
Spodoptera litura is one of the major insect pests of vegetables in Sichuan, China, and it has developed serious resistance to many traditional chemical insecticides. In this present study, S. litura individuals collected from five regions in Sichuan in 2017, which were detected the resistance to bistrifluron. We found that the resistance ratios (RRs) bistrifluron were in the ranges of 15.9- to 77.7-fold, respectively, compared with a laboratory susceptible (Lab-HN) strain. To elucidate the effect of bistrifluron on the life history parameters of S...
February 13, 2019: Ecotoxicology
https://read.qxmd.com/read/30758727/derivation-of-combined-species-sensitivity-distributions-for-acute-toxicity-of-pyrethroids-to-aquatic-animals
#16
Jeffrey M Giddings, Jeffrey Wirtz, David Campana, Michael Dobbs
The aquatic toxicity profiles of synthetic pyrethroid insecticides are remarkably similar, and results for a large number of species can be combined across compounds in Species Sensitivity Distributions (SSDs). Normalizing acute toxicity values (median lethal concentrations, LC50s) for each species and each pyrethroid to the LC50 of the same pyrethroid to the freshwater amphipod Hyalella azteca (the most sensitive species to all pyrethroids tested) enabled expression of LC50s as Hyalella equivalents that can be pooled across pyrethroids...
February 13, 2019: Ecotoxicology
https://read.qxmd.com/read/30734194/contribution-of-trace-metallic-elements-to-weakly-contaminated-lacustrine-sediments-effects-on-benthic-and-pelagic-organisms-through-multi-species-laboratory-bioassays
#17
Nathalie Lécrivain, Victor Frossard, Bernard Clément
Surficial sediments exhibit higher levels of contamination than overlying water, especially from persistent contaminants such as trace metallic elements (TMEs). While sediments could in turn act as sources of contamination for the water column, their ecotoxicology is yet rarely assessed in a multi-compartments perspective. This study aims at assessing the response of benthic and pelagic organisms exposed to weakly contaminated sediments using a multi-species laboratory assay by focusing on TMEs (Cd, Cr, Cu, Ni, Pb, and Zn) contamination...
February 7, 2019: Ecotoxicology
https://read.qxmd.com/read/30666495/factors-influencing-fish-mercury-concentrations-in-iowa-rivers
#18
Nathan Mills, Michael J Weber, Clay L Pierce, Darcy Cashatt
Fish mercury concentrations have received considerable attention due to human health implications. Fish mercury concentrations are variable within and among systems due to a suite of biotic and abiotic influences that vary among regions and are difficult to predict. Understanding factors associated with variability in fish mercury concentrations would help guide consumption advisories. Mercury concentrations in channel catfish (Ictalurus punctatus, n = 205), flathead catfish (Pylodictis olivaris, n = 123), northern pike (Esox lucius, n = 60), smallmouth bass (Micropterus dolomieu, n = 176), and walleye (Sander vitreus, n = 176) were assessed in ten Iowa rivers and relationships with land use, water chemistry, and fish characteristics were explored...
January 21, 2019: Ecotoxicology
https://read.qxmd.com/read/30666494/neonicotinoid-insecticidal-seed-treatment-on-corn-contaminates-interseeded-cover-crops-intended-as-habitat-for-beneficial-insects
#19
Michael M Bredeson, Jonathan G Lundgren
Neonicotinoid seed treatments are extensively used to systemically protect corn from invertebrate herbivory. Interseeding cover crops can promote beneficial insect communities and their ecosystem services such as predation on pests, and this practice is gaining interest from farmers. In this study, cereal rye (Secale cereale) and hairy vetch (Vicia villosa) were planted between rows of early vegetative corn that had been seed-treated with thiamethoxam. Thiamethoxam and its insecticidal metabolite, clothianidin were quantified in cover crop leaves throughout the growing season...
January 21, 2019: Ecotoxicology
https://read.qxmd.com/read/30652235/mating-under-the-influence-male-siamese-fighting-fish-prefer-ee2-exposed-females
#20
Rebecca A Cram, Jaslynn M Lawrence, Teresa L Dzieweczynski
Countless pharmaceuticals and endocrine disrupting chemicals (EDCs) exist on the market with more added each day. Many of these compounds are not removed during the wastewater treatment process and enter bodies of water in their active form. EDCs are known to have physiological and behavioral effects in exposed organisms. Exposure to the synthetic estrogen 17α-ethinylestradiol (EE2), a common EDC found in birth control pills, has been found to lead to population collapse after only a few generations in some fish species...
January 16, 2019: Ecotoxicology
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