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Ecotoxicology

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https://www.readbyqxmd.com/read/28108890/toxic-and-heavy-metals-as-a-cause-of-crayfish-mass-mortality-from-acidified-headwater-streams
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
https://www.readbyqxmd.com/read/28083773/assessment-of-cytotoxicity-genotoxicity-and-7-ethoxyresorufin-o-deethylase-erod-induction-in-sediment-extracts-from-new-zealand-urban-estuaries
#7
Patrick Heinrich, Lara L Petschick, Grant L Northcott, Louis A Tremblay, James M Ataria, Thomas Braunbeck
Sediments represent a major sink for contaminants resulting from industrial and agricultural activities - especially lipophilic substances. This study exclusively used in vitro methodologies to characterize specific toxicity effects of contaminants in sediment extracts from two urban New Zealand estuaries. Sediment extracts were prepared and tested for a range of biological endpoints. The micronucleus and comet assays in V79 cells were used to assess genotoxicity. Induction of 7-ethoxyresorufin-O-deethylase in piscine RTL-W1 cells was determined to estimate dioxin-like toxicity...
January 12, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28044217/combined-toxicity-of-arsenite-and-dimethylarsenic-acid-on-the-freshwater-diatom-nitzschia-palea
#8
Tengda Ding, Jianying Zhang, Wanmin Ni, Juying Li
The toxicity and bioavailability of single arsenic species have been widely investigated, however, the biological effects of mixed arsenic species co-existing in natural waters still remain unknown. The objective of this work was to discern the adverse effects of combined arsenite (As(III)) and dimethylarsenic acid (DMA) on diatom Nitzschia palea. The combined ecotoxicity of As(III) and DMA on N. palea was observed to be time-dependent and showed dose-effect relation. The toxicity of DMA and As(III) mixture was higher than individual DMA or As(III) when the As(III) concentration was in the range of 0...
January 2, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28025743/relationship-between-organochlorine-pesticides-and-stress-indicators-in-hawksbill-sea-turtle-eretmochelys-imbricata-nesting-at-punta-xen-campeche-southern-gulf-of-mexico
#9
Nelly Tremblay, Alejandro Ortíz Arana, Mauricio González Jáuregui, Jaime Rendón-von Osten
Data on the impact of environmental pollution on the homeostasis of sea turtles remains scarce, particularly in the Southern Gulf of Mexico. As many municipalities along the coastline of the Yucatan Peninsula do not rely on a waste treatment plant, these organisms could be particularly vulnerable. We searched for relationships between the presence of organochlorine pesticides (OCP) and the level of several oxidative and pollutant stress indicators of the hawksbill sea turtle (Eretmochelys imbricata) during the 2010 nesting season at Punta Xen (Campeche, Mexico)...
December 26, 2016: Ecotoxicology
https://www.readbyqxmd.com/read/27995410/temporal-trends-in-mercury-concentrations-in-raptor-flight-feathers-stored-in-an-environmental-specimen-bank-in-galicia-nw-spain-between-2000-and-2013
#10
Rita García-Seoane, Zulema Varela, Alejo Carballeira, Jesús R Aboal, J Ángel Fernández
Temporal trends in Hg concentrations were investigated in primary flight feathers from 319 specimens of three birds of prey: P7 in the northern goshawk (Accipiter gentilis), P6 in the common buzzard (Buteo buteo) and P5 in the tawny owl (Strix aluco). The samples were stored in a regional environmental specimen bank and belonged to specimens which died between 2000 and 2013 in Galicia (NW Spain). We would expect to see a decline in Hg concentrations across the study period, as data of atmospheric emissions show a gradual reduction of this pollutant in Europe in the last two decades...
December 19, 2016: Ecotoxicology
https://www.readbyqxmd.com/read/27995409/the-hydra-regeneration-assay-reveals-ecological-risks-in-running-waters-a-new-proposal-to-detect-environmental-teratogenic-threats
#11
Lorenzo Traversetti, Floriano Del Grosso, Valentina Malafoglia, Marco Colasanti, Simona Ceschin, Stefano Larsen, Massimiliano Scalici
The regenerative ability of Hydra vulgaris was tested as potential biomarker for the development of a new eco-toxicological index. The test is based on the regeneration rate and the aberration frequency of the columna (body and adhesive foot) after separation from head and tentacles by a bistoury. Particularly, 45 columnae were submerged in the rearing solution (that is Hydra medium) to have control, and 285 in potential contaminated waters to have treatments, collected from 19 sites along 10 rivers in central Italy...
December 19, 2016: Ecotoxicology
https://www.readbyqxmd.com/read/27933552/use-of-low-density-polyethylene-membranes-for-assessment-of-genotoxicity-of-pahs-in-the-seine-river
#12
Françoise Vincent-Hubert, Emmanuelle Uher, Carole Di Giorgio, Cécile Michel, Michel De Meo, Catherine Gourlay-France
The genotoxicity of river water dissolved contaminants is usually estimated after grab sampling of river water. Water contamination can now be obtained with passive samplers that allow a time-integrated sampling of contaminants. Since it was verified that low density polyethylene membranes (LDPE) accumulate labile hydrophobic compounds, their use was proposed as a passive sampler. This study was designed to test the applicability of passive sampling for combined chemical and genotoxicity measurements. The LDPE extracts were tested with the umu test (TA1535/pSK1002 ± S9) and the Ames assay (TA98, TA100 and YG1041 ± S9)...
December 8, 2016: Ecotoxicology
https://www.readbyqxmd.com/read/27981403/de-novo-transcriptome-sequencing-and-analysis-of-freshwater-snail-radix-balthica-to-discover-genes-and-pathways-affected-by-exposure-to-oxazepam
#13
Jean-Yves Mazzitelli, Elsa Bonnafe, Christophe Klopp, Frédéric Escudier, Florence Geret
Pharmaceuticals are increasingly found in aquatic ecosystems due to the non-efficiency of waste water treatment plants. Therefore, aquatic organisms are frequently exposed to a broad diversity of pharmaceuticals. Freshwater snail Radix balthica has been chosen as model to study the effects of oxazepam (psychotropic drug) on developmental stages ranging from trochophore to hatching. In order to provide a global insight of these effects, a transcriptome deep sequencing has been performed on exposed embryos. Eighteen libraries were sequenced, six libraries for three conditions: control, exposed to the lowest oxazepam concentration with a phenotypic effect (delayed hatching) (TA) and exposed to oxazepam concentration found in freshwater (TB)...
January 2017: Ecotoxicology
https://www.readbyqxmd.com/read/27981402/the-response-of-marigold-tagetes-erecta-linn-to-ozone-impacts-on-plant-growth-and-leaf-physiology
#14
Ning Yang, Xiaoke Wang, Feixiang Zheng, Yuanyuan Chen
Progressively increasing ozone (O3) concentrations pose a potential threat to the value of marigold (Tagetes erecta Linn.), a plant widely used in urban landscaping. The response of marigold to elevated O3 has been reported earlier, but the mechanisms underlying the O3 effect have not been clearly elucidated. In the present study, we exposed marigold "Moonsong Deep Orange" plants to elevated O3, including ambient non-filtered air (NF) plus 60 ppb (NF+60) and 120 ppb (NF+120) O3, to assess visible injury and the possible physiological consequences of this pollutant...
January 2017: Ecotoxicology
https://www.readbyqxmd.com/read/27933554/use-of-anticoagulant-rodenticides-by-pest-management-professionals-in-massachusetts-usa
#15
Kristin Memmott, Maureen Murray, Allen Rutberg
Secondary exposure to chemical rodenticides, specifically second-generation anticoagulant rodenticides (SGARs), poses a threat to non-target wildlife including birds of prey. Federal regulations in the United States currently limit homeowner access to SGARs as a way of minimizing this threat. With legal access to SGARs, pest management professionals (PMPs) represent a potential linkage to non-target exposure. There is limited research focused on rodent control practices, chemical rodenticide preferences, level of concern and awareness, or opinions on rodenticide regulations as they relate to PMPs...
January 2017: Ecotoxicology
https://www.readbyqxmd.com/read/27933553/spontaneous-honeybee-behaviour-is-altered-by-persistent-organic-pollutants
#16
Jade Drummond, Sally M Williamson, Ann E Fitchett, Geraldine A Wright, Sarah J Judge
The effect of environmental pollutants on honeybee behaviour has focused mainly on currently used pesticides. However, honeybees are also exposed to persistent organic pollutants (POPs). The aim of this laboratory based study was to determine if exposure to sublethal field-relevant concentrations of POPs altered the spontaneous behaviour of foraging-age worker honeybees. Honeybees (Apis mellifera) were orally exposed to either a sublethal concentration of the polychlorinated biphenyl (PCB) mixture Aroclor 1254 (100 ng/ml), the organochlorine insecticide lindane (2...
January 2017: Ecotoxicology
https://www.readbyqxmd.com/read/27913897/rainbow-trout-oncorhynchus-mykiss-pro-oxidant-and-genotoxic-responses-following-acute-and-chronic-exposure-to-the-antibiotic-oxytetracycline
#17
Sara Rodrigues, Sara C Antunes, Alberto T Correia, Bruno Nunes
Oxytetracycline (OTC), an antibacterial agent, is extensively used in aquaculture practices all over the world, but also in human and veterinary medicines. Because of its intensive use, low rates of absorption by treated animals, inadequate disposal, and low efficiency of removal in wastewater treatment plants, the potential harmful effects on aquatic organisms are of great concern. This work aimed to assess the effects of this antibiotic in rainbow trout, following both acute and chronic exposures. Catalase (CAT), total glutathione peroxidase (GPx), glutathione reductase (GRed) activities and lipid peroxidation (TBARS levels) were quantified as oxidative stress biomarkers, in gills and liver...
January 2017: Ecotoxicology
https://www.readbyqxmd.com/read/27909840/variable-toxicity-of-silver-nanoparticles-to-daphnia-magna-effects-of-algal-particles-and-animal-nutrition
#18
Andrea L Conine, Paul C Frost
Aquatic environments vary widely in aspects other than their physicochemical properties that could alter the toxicity of novel contaminants. One factor that could affect chemical toxicity to aquatic consumers is their nutritional environment as it can strongly affect their physiology and life history. Nutrition has the potential to alter an organism's response to the toxin or how the toxin interacts with the consumer through its food. Here we determined how growth and survival responses of Daphnia to an emerging contaminant, silver nanoparticles (AgNPs), are affected by the presence of food and its stoichiometric food quality...
January 2017: Ecotoxicology
https://www.readbyqxmd.com/read/27888383/relationships-between-blood-mercury-levels-reproduction-and-return-rate-in-a-small-seabird
#19
Ingrid L Pollet, Marty L Leonard, Nelson J O'Driscoll, Neil M Burgess, Dave Shutler
Mercury (Hg) is a ubiquitous heavy metal that occurs naturally in the environment, but its levels have been supplemented for decades by a variety of human activities. Mercury can have serious deleterious effects on a variety of organisms, with top predators being particularly susceptible because methylmercury bioaccumulates and biomagnifies in food webs. Among birds, seabirds can have especially high levels of Hg contamination and Leach's storm-petrels (Oceanodroma leucorhoa), in particular, have amongst the highest known levels...
January 2017: Ecotoxicology
https://www.readbyqxmd.com/read/27866343/maternal-transfer-of-trace-elements-in-the-atlantic-horseshoe-crab-limulus-polyphemus
#20
Aaron K Bakker, Jessica Dutton, Matthew Sclafani, Nicholas Santangelo
The maternal transfer of trace elements is a process by which offspring may accumulate trace elements from their maternal parent. Although maternal transfer has been assessed in many vertebrates, there is little understanding of this process in invertebrate species. This study investigated the maternal transfer of 13 trace elements (Ag, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, and Zn) in Atlantic horseshoe crab (Limulus polyphemus) eggs and compared concentrations to those in adult leg and gill tissue. For the majority of individuals, all trace elements were transferred, with the exception of Cr, from the female to the eggs...
January 2017: Ecotoxicology
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