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Ecotoxicology

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https://www.readbyqxmd.com/read/28220339/triphenyltin-hydroxide-induces-changes-in-the-oxidative-stress-parameters-of-fish
#1
Bárbara Clasen, Alexssandro G Becker, Thais Lópes, Camila R Murussi, Fabiane G Antes, Roberta C Horn, Érico M M Flores, Bernardo Baldisserotto, Valderi L Dressler, Vania L Loro
Among all organotin compounds , triphenyltin hydroxide (TPhTH) is widely used as fungicide and moluscicide in Brazil. However, the effects of TPhTH on the biochemical parameters of non-target organisms, such as fish, are little known. The aim of the present study is to assess the possible toxic effects of different concentrations of waterborne TPhTH on silver catfish belonging to species Rhamdia quelen. The fish were exposed to two different concentrations of TPhTH (1.08 and 1.70 µg/L as Sn) for 15 days and then compared to the control group (triplicate, n = 3)...
February 20, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28213827/resistance-to-polycyclic-aromatic-hydrocarbon-toxicity-and-associated-bioenergetic-consequences-in-a-population-of-fundulus-heteroclitus
#2
C D Lindberg, N Jayasundara, J S Kozal, T C Leuthner, R T Di Giulio
Several locations in the Elizabeth River, VA, USA are highly contaminated with polycyclic aromatic hydrocarbons (PAHs) due to the release of creosote mixtures from wood treatment facilities. Interestingly, some populations of Atlantic killifish (Fundulus heteroclitus) inhabiting the Elizabeth River (ER) are resistant to PAH-induced teratogenesis. However, evolutionary resistance to PAHs due to chronic PAH exposure is associated with reduced fitness and increased susceptibility to other environmental stressors in at least one PAH-resistant ER killifish population...
February 17, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28204976/variation-in-whole-dna-methylation-in-red-maple-acer-rubrum-populations-from-a-mining-region-association-with-metal-contamination-and-cation-exchange-capacity-cec-in-podzolic-soils
#3
K N Kalubi, M Mehes-Smith, G Spiers, A Omri
Although a number of publications have provided convincing evidence that abiotic stresses such as drought and high salinity are involved in DNA methylation reports on the effects of metal contamination, pH, and cation exchange on DNA modifications are limited. The main objective of the present study is to determine the relationship between metal contamination and Cation exchange capacity (CEC) on whole DNA modifications. Metal analysis confirms that nickel and copper are the main contaminants in sampled sites within the Greater Sudbury Region (Ontario, Canada) and liming has increased soil pH significantly even after 30 years following dolomitic limestone applications...
February 15, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28197855/soil-microbial-community-responses-to-contamination-with-silver-aluminium-oxide-and-silicon-dioxide-nanoparticles
#4
C F McGee, S Storey, N Clipson, E Doyle
Soil microorganisms are key contributors to nutrient cycling and are essential for the maintenance of healthy soils and sustainable agriculture. Although the antimicrobial effects of a broad range of nanoparticulate substances have been characterised in vitro, little is known about the impact of these compounds on microbial communities in environments such as soil. In this study, the effect of three widely used nanoparticulates (silver, silicon dioxide and aluminium oxide) on bacterial and fungal communities in an agricultural pastureland soil was examined in a microcosm-based experiment using a combination of enzyme analysis, molecular fingerprinting and amplicon sequencing...
February 14, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28188591/shell-fluctuating-asymmetry-in-the-sea-dwelling-benthic-bivalve-mytilus-galloprovincialis-lamarck-1819-as-morphological-markers-to-detect-environmental-chemical-contamination
#5
Massimiliano Scalici, Lorenzo Traversetti, Federica Spani, Valentina Malafoglia, Monica Colamartino, Tiziana Persichini, Simone Cappello, Giuseppe Mancini, Giulia Guerriero, Marco Colasanti
Investigations on asymmetries showed that deviations from perfect bilateral symmetry are interpreted as environmental changes inducing developmental instability. Since morphological abnormalities increase with pollution, deformations may be considered indicators of the organism exposition to pollution. Therefore, the onset of asymmetry in otherwise normally symmetrical traits has been used as a measure of some stresses as well. In this context, we studied how marine pollution affects the valve morphological alterations in the mussel Mytilus galloprovincialis...
February 10, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28188590/pesticide-stress-on-plants-negatively-affects-parasitoid-fitness-through-a-bypass-of-their-phytophage-hosts
#6
Andries A Kampfraath, Daniel Giesen, Cornelis A M van Gestel, Cécile Le Lann
Pesticides taken up by plants from the soil or interstitial (pore) water can cascade to higher trophic levels, which are expected to be more affected due to cumulative bottom-up effects. Knowledge about the impact of indirect exposure to pesticides on non-target terrestrial trophic chains, however, is still lacking. Therefore, we examined the direct and indirect effects of three concentrations of the herbicide 2,6-dichlorobenzonitrile (DCBN) and an insecticide with a similar molecular structure (1,4-dichlorobenzene, DCB) on the fitness traits of a tritrophic system: the wheat plant Triticum aestivum, the aphid Sitobion avenae and its specialist parasitoid Aphidius rhopalosiphi...
February 10, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28168557/validation-of-the-oecd-reproduction-test-guideline-with-the-new-zealand-mudsnail-potamopyrgus-antipodarum-using-trenbolone-and-prochloraz
#7
Cornelia Geiß, Katharina Ruppert, Clare Askem, Carlos Barroso, Daniel Faber, Virginie Ducrot, Henrik Holbech, Thomas H Hutchinson, Paula Kajankari, Karin Lund Kinnberg, Laurent Lagadic, Peter Matthiessen, Steve Morris, Maurine Neiman, Olli-Pekka Penttinen, Paula Sanchez-Marin, Matthias Teigeler, Lennart Weltje, Jörg Oehlmann
The Organisation for Economic Cooperation and Development (OECD) provides several standard test methods for the environmental hazard assessment of chemicals, mainly based on primary producers, arthropods, and fish. In April 2016, two new test guidelines with two mollusc species representing different reproductive strategies were approved by OECD member countries. One test guideline describes a 28-day reproduction test with the parthenogenetic New Zealand mudsnail Potamopyrgus antipodarum. The main endpoint of the test is reproduction, reflected by the embryo number in the brood pouch per female...
February 6, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28155035/toxicodynamic-modeling-of-zebrafish-larvae-to-metals-using-stochastic-death-and-individual-tolerance-models-comparisons-of-model-assumptions-parameter-sensitivity-and-predictive-performance
#8
Yongfei Gao, Jianfeng Feng, Lin Zhu
Process-based toxicodynamic (TD) models are playing an increasing role in predicting chemical toxicity to aquatic organism. Stochastic death (SD) and individual tolerance distribution (IT) are two often used assumptions in TD models which could lead to different consequences for risk assessment of chemicals. Here, using the toxicity data of single (Cu, Zn, Cd, and Pb) and their binary metal mixtures on survival of zebrafish larvae, we assessed the parameter sensitivity and evaluated the predictive performance of SD and IT models...
February 3, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28155034/the-use-of-minimum-selectable-concentrations-mscs-for-determining-the-selection-of-antimicrobial-resistant-bacteria
#9
Sadia Khan, Tara K Beattie, Charles W Knapp
The use of antimicrobial compounds is indispensable in many industries, especially drinking water production, to eradicate microorganisms. However, bacterial growth is not unusual in the presence of disinfectant concentrations that would be typically lethal, as bacterial populations can develop resistance. The common metric of population resistance has been based on the Minimum Inhibitory Concentration (MIC), which is based on bacteria lethality. However, sub-lethal concentrations may also select for resistant bacteria due to the differences in bacterial growth rates...
February 2, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28144803/effect-of-petroleum-derived-substances-on-life-history-traits-of-black-bean-aphid-aphis-fabae-scop-and-on-the-growth-and-chemical-composition-of-broad-bean
#10
Milena Rusin, Janina Gospodarek, Aleksandra Nadgórska-Socha, Gabriela Barczyk
The aim of the study was to determine the effects of various petroleum-derived substances, namely petrol, diesel fuel and spent engine oil, on life history traits and population dynamics of the black bean aphid Aphis fabae Scop. and on growth and chemical composition of its host plant Vicia faba L. Each substance was tested separately, using two concentrations (9 g kg(-1) and 18 g kg(-1)). The experiment was conducted in four replications (four pots with five plants in each pot per treatment). Plants were cultivated in both control and contaminated soils...
January 31, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28130694/life-cycle-toxicity-assessment-of-earthworms-exposed-to-cadmium-contaminated-soils
#11
Wei-Yu Chen, Wen-Hsuan Li, Yun-Ru Ju, Chung-Min Liao, Vivian Hsiu-Chuan Liao
Cadmium (Cd) is of great concern in the soil environment and it can damage terrestrial organisms. The purpose of this study was to employ a toxicokinetic/toxicodynamic (TK/TD) approach to investigate the effects of toxicologically relevant Cd accumulation on the life cycle growth of earthworms (Lumbricus rubellus and Eisenia fetida) and to assess potential terrestrial ecosystem risk. We reanalyzed growth toxicity and whole body and pellet accumulation data linked with TK/TD and life cycle growth models to estimate key rate constants...
January 27, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28116643/risk-assessment-of-various-insecticides-used-for-management-of-asian-citrus-psyllid-diaphorina-citri-in-florida-citrus-against-honey-bee-apis-mellifera
#12
Xue Dong Chen, Torrence A Gill, Kirsten S Pelz-Stelinski, Lukasz L Stelinski
The Asian citrus psyllid, Diaphorina citri Kuwayama (Hemiptera: Liviidae), is a major pest of citrus trees worldwide. A wide variety of insecticides are used to manage D. citri populations within citrus groves in Florida. However, in areas shared by citrus growers and beekeepers the use of insecticides may increase the risks of Apis mellifera  L. (Hymenoptera: Apidae) loss and contaminated honey. The objective of this research was to determine the environmental toxicity of insecticides, spanning five different modes of action used to control D...
January 23, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28116642/evaluation-of-oxidative-stress-biomarkers-in-aiolopus-thalassinus-orthoptera-acrididae-collected-from-areas-polluted-by-the-fertilizer-industry
#13
Hesham A Yousef, Eman A Abdelfattah, Maria Augustyniak
The waste products of the fertilizer industry such as heavy metals, but especially phosphates and sulphates, are a serious problem that influences the structure and functioning of ecosystems. The levels of Cd, Pb, Zn, Cu, sulphates and phosphates were measured in soil samples from four sites: a control and sites that were 1, 3 and 6 km (sites A-C) away from the Abu-Zaabal Fertilizer Company. Oxidative stress markers (protein carbonyls, lipid peroxides), antioxidant enzymes (superoxide dismutase (SOD), catalase (CAT), polyphenoloxidase (PPO) and ascorbate peroxidase (APOX)) were evaluated in the tissues of Aiolopus thalassinus, collected from the corresponding sites...
January 23, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28116641/multigeneration-toxicity-of-imidacloprid-and-thiacloprid-to-folsomia-candida
#14
Cornelis A M van Gestel, Claudia de Lima E Silva, Thao Lam, Jacco C Koekkoek, Marja H Lamoree, Rudo A Verweij
In a recent study, we showed that the springtail Folsomia candida was quite sensitive the neonicotinoid insecticides imidacloprid and thiacloprid. This study aimed at determining the toxicity of both compounds to F. candida following exposure over three generations, in natural LUFA 2.2 standard soil. In the first generation, imidacloprid was more toxic than thiacloprid, with LC50s of 0.44 and 9.0 mg/kg dry soil, respectively and EC50s of 0.29 and 1.5 mg/kg dry soil, respectively. The higher LC50/EC50 ratio suggests that thiacloprid has more effects on reproduction, while imidacloprid shows lethal toxicity to the springtails...
January 23, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28108890/toxic-and-heavy-metals-as-a-cause-of-crayfish-mass-mortality-from-acidified-headwater-streams
#15
Jitka Svobodová, Karel Douda, David Fischer, Natalia Lapšanská, Pavel Vlach
Mining activities are responsible for high concentrations of metals in river networks in many parts of the world. Mining activities and the resulting high loads of heavy metals interact with intensive acid rain, and often have great consequences for biodiversity. However, considering the frequently episodic nature of these heavy acid rains, there is little detailed evidence of direct impacts. In 2011 we observed a massive mortality of noble crayfish and stone crayfish in Padrťsko Special Area of Conservation (SAC) in the Brdy Mountain region of the Czech Republic...
January 21, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28108889/hg-and-se-exposure-in-brain-tissues-of-striped-dolphin-stenella-coeruleoalba-and-bottlenose-dolphin-tursiops-truncatus-from-the-tyrrhenian-and-adriatic-seas
#16
Antonio Bellante, Fabio D'Agostino, Anna Traina, Daniela Piazzese, Maria Francesca Milazzo, Mario Sprovieri
In this study we analyzed Hg and Se concentrations in dolphin brain tissues of fifteen specimens of striped dolphin (Stenella coeruleoalba) and eight specimens of bottlenose dolphin (Tursiops truncatus) stranded in the Tyrrhenian and Adriatic Seas, in order to assess the toxicological risks associated with Hg exposure. High Hg concentrations were found in brain tissues of both analyzed specie (1.86-243 mg/kg dw for striped dolphin and 2.1-98.7 mg/kg dw for bottlenose dolphin), exceeding levels associated with marine mammals neurotoxicity...
January 21, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28108888/biofilm-phosphorus-uptake-capacity-as-a-tool-for-the-assessment-of-pollutant-effects-in-river-ecosystems
#17
Lorenzo Proia, Anna Romaní, Sergi Sabater
Biofilms are a key component in the nutrient removal from the water column. However, nutrient uptake by biofilms may be hampered by the occurrence of pollutants or other stressors. This study aimed: (i) to investigate the biofilm phosphorus (P) uptake capacity as a relevant process for the maintenance of fluvial water quality and (ii) to explore the sensitivity of this process to different chemical and environmental stressors. We conducted chamber experiments to test for the relevance of biofilm P uptake capacity (PUC) as a tool to detect effects of pollutants on river self-depuration...
January 21, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28105571/metal-stress-in-zooplankton-diapause-production-post-hatching-response
#18
Adriana Aránguiz-Acuña, Pablo Pérez-Portilla
Aquatic organisms commonly respond to harsh conditions by forming diapausing stages, which enable populations to survive adverse periods forming egg banks. Production of diapausing eggs is frequently observed in monogonont rotifers, previously changing from asexual to partial sexual reproduction (mixis). In despite that zooplankton are frequently used in ecotoxicological assessment because of their sensitivity to various toxicants and their important role in the ecosystems, toxicity evaluations often consider the directly exposed population produced by parthenogenetic reproduction, exclusively...
January 19, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28083775/the-effect-of-sediment-characteristics-on-bioturbation-mediated-transfer-of-lead-in-freshwater-laboratory-microcosms-with-lumbriculus-variegatus
#19
Emmanuel R Blankson, Paul L Klerks
While it has been well established that sediment bioturbators can affect the fate of metals in aquatic systems and that the fate of metals there can depend on sediment characteristics, the interaction between these influences is not well known. The present study therefore investigated whether the influence of a sediment bioturbator on the fate of metals is affected by sediment characteristics. This was investigated using two laboratory microcosm experiments with lead-contaminated sediment and the oligochaete Lumbriculus variegatus...
January 12, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28083774/does-seed-size-and-surface-anatomy-play-role-in-combating-phytotoxicity-of-nanoparticles
#20
Navin Jain, Arpit Bhargava, Vikram Pareek, Mohd Sayeed Akhtar, Jitendra Panwar
Rapid utilization of nano-based products will inevitably release nanoparticles into the environment with unidentified consequences. Plants, being an integral part of ecosystem play a vital role in the incorporation of nanoparticles in food chain and thus, need to be critically assessed. The present study assesses the comparative phytotoxicity of nanoparticle, bulk and ionic forms of zinc at different concentrations on selected plant species with varying seed size and surface anatomy. ZnO nanoparticles were chosen in view of their wide spread use in cosmetics and health care products, which allow their direct release in the environment...
January 12, 2017: Ecotoxicology
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