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https://www.readbyqxmd.com/read/29223819/global-occurrence-of-polybrominated-diphenyl-ethers-and-their-hydroxylated-and-methoxylated-structural-analogues-in-an-important-animal-feed-fishmeal
#1
Xiaomin Li, Shujun Dong, Wei Zhang, Xia Fan, Yang Li, Ruiguo Wang, Xiaoou Su
Polybrominated diphenyl ethers (PBDEs) and their hydroxylated (OH) and methoxylated (MeO) structural analogues have been found widely distributed in aquatic ecosystems, and may exhibit potential adverse effects to humans due to their bioaccumulative behavior through food chain. Fishmeal is an important animal feed applied around the world and is generally of marine origin. However, the levels and sources of PBDEs in fishmeal have not been thoroughly evaluated and their structural analogues have not been reported to date...
December 7, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29223105/towards-a-rapid-assessment-protocol-for-identifying-pit-lakes-worthy-of-restoration
#2
W J de Lange, B Genthe, L Hill, P J Oberholster
Before the introduction of reclamation legislation in South Africa, final cut lakes in mining areas were left without any restoration while the final excavation was not back filled. Characteristics of these lacustrine water bodies vary considerably, but they are often linear in shape, large (1-30 ha), deep (2-30 m) and have poorly developed littoral zones. With water tables often near the surface; a variety of vascular hydrophytes can colonize these bodies, thus establishing emerging wetland type ecosystems...
December 6, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29223074/bioaccumulation-and-trophic-transfer-of-cyclic-volatile-methylsiloxanes-cvms-in-the-aquatic-marine-food-webs-of-the-oslofjord-norway
#3
David E Powell, Merete Schøyen, Sigurd Øxnevad, Reinhard Gerhards, Thomas Böhmer, Martin Koerner, Jeremy Durham, Darren W Huff
The trophic transfer of cyclic methylsiloxanes (cVMS) in aquatic ecosystems is an important criterion for assessing bioaccumulation and ecological risk. Bioaccumulation and trophic transfer of cVMS, specifically octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6), were evaluated for the marine food webs of the Inner and Outer Oslofjord, Norway. The sampled food webs included zooplankton, benthic macroinvertebrates, shellfish, and finfish species. Zooplankton, benthic macroinvertebrates, and shellfish occupied the lowest trophic levels (TL ≈2 to 3); northern shrimp (Pandalus borealis) and Atlantic herring (Clupea harengus) occupied the middle trophic levels (TL ≈3 to 4), and Atlantic cod (Gadus morhua) occupied the highest tropic level (TL>4...
December 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29222603/adequacy-of-planctomycetes-as-supplementary-food-source-for-daphnia-magna
#4
M C Marinho, O M Lage, José Catita, S C Antunes
The nutritional quality of daphnids diet can influence their growth, reproduction and survival. In aquatic ecosystems, bacteria can contribute significantly to Daphnia diet by supporting, for instances, their high needs for phosphorus. The laboratory feeding of the model organisms Daphnia spp. is algal based, but should be improved to allow their better performance. The aim of this study was to evaluate the potential of two planctomycetes, Gemmata obscuriglobus and Rhodopirellula rubra, from exponential and stationary growth phases as alternative or supplementary food source for Daphnia magna...
December 8, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/29220784/physiological-effects-caused-by-microcystin-producing-and-non-microcystin-producing-microcystis-aeruginosa-on-medaka-fish-a%C3%A2-proteomic-and-metabolomic-study-on-liver
#5
Séverine Le Manach, Benoit Sotton, Hélène Huet, Charlotte Duval, Alain Paris, Arul Marie, Claude Yépremian, Arnaud Catherine, Lucrèce Mathéron, Joelle Vinh, Marc Edery, Benjamin Marie
Cyanobacterial blooms have become a common phenomenon in eutrophic freshwater ecosystems worldwide. Microcystis is an important bloom-forming and toxin-producing genus in continental aquatic ecosystems, which poses a potential risk to Human populations as well as on aquatic organisms. Microcystis is known to produce along with various bioactive peptides, the microcystins (MCs) that have attracted more attention notably due to their high hepatotoxicity. To better understand the effects of cyanobacterial blooms on fish, medaka fish (Oryzias latipes) were sub-chronically exposed to either non-MC-producing or MC-producing living strains and, for this latter, to its subsequent MC-extract of Microcystis aeruginosa...
December 5, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29220760/historical-trace-element-accumulation-in-marine-sediments-from-the-tamaulipas-shelf-gulf-of-mexico-an-assessment-of-natural-vs-anthropogenic-inputs
#6
Omar Celis-Hernandez, Leticia Rosales-Hoz, Andrew B Cundy, Arturo Carranza-Edwards, Ian W Croudace, Hector Hernandez-Hernandez
The Gulf of Mexico is considered one of the world's major marine ecosystems, supporting important fisheries and habitats such as barrier islands, mangrove forests, seagrass beds, coral reefs etc. It also hosts a range of complex offshore petroleum exploration, extraction, and refining industries, which may have chronic or acute impacts on ecosystem functioning. Previous work on the marine effects of this activity is geographically incomplete, and has tended to focus on direct hydrocarbon impacts, while impacts from other related contaminants (e...
December 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29220394/a-systematic-approach-to-evaluate-the-influence-of-environmental-conditions-on-edna-detection-success-in-aquatic-ecosystems
#7
Bernhard C Stoeckle, Sebastian Beggel, Alexander F Cerwenka, Elena Motivans, Ralph Kuehn, Juergen Geist
The use of environmental DNA (eDNA) to determine the presence and distribution of aquatic organisms has become an important tool to monitor and investigate freshwater communities. The successful application of this method in the field, however, is dependent on the effectiveness of positive DNA verification, which is influenced by site-specific environmental parameters. Factors affecting eDNA concentrations in aquatic ecosystems include flow conditions, and the presence of substances that possess DNA-binding properties or inhibitory effects...
2017: PloS One
https://www.readbyqxmd.com/read/29218574/tracking-long-distance-atmospheric-deposition-of-trace-metal-emissions-from-smelters-in-the-upper-columbia-river-valley-using-pb-isotope-analysis-of-lake-sediments
#8
Andrew Wright Child, Barry C Moore, Jeffrey D Vervoort, Marc W Beutel
Heavy metal discharge from mining and smelting operations into aquatic ecosystems can cause long-term biological and ecological impacts. The upper Columbia River is highly contaminated with heavy metal wastes from nearby smelting operations in Trail, British Columbia, Canada, and to a lesser extent, Northport (Le Roi smelter), Washington, USA. Airborne emissions from the Trail operations were historically and are currently transported by prevailing winds down the Columbia River canyon, where particulate metals can be deposited into lakes and watersheds...
December 7, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29213266/taxonomic-and-functional-differences-between-microbial-communities-in-qinghai-lake-and-its-input-streams
#9
Ze Ren, Fang Wang, Xiaodong Qu, James J Elser, Yang Liu, Limin Chu
Understanding microbial communities in terms of taxon and function is essential to decipher the biogeochemical cycling in aquatic ecosystems. Lakes and their input streams are highly linked. However, the differences between microbial assemblages in streams and lakes are still unclear. In this study, we conducted an intensive field sampling of microbial communities from lake water and stream biofilms in the Qinghai Lake watershed, the largest lake in China. We determined bacterial communities using high-throughput 16S rRNA gene sequencing and predicted functional profiles using PICRUSt to determine the taxonomic and functional differences between microbial communities in stream biofilms and lake water...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29211466/identification-of-unknown-antiandrogenic-compounds-in-surface-waters-by-effect-directed-analysis-eda-using-a-parallel-fractionation-approach
#10
Matthias Muschket, Carolina Di Paolo, Andrew J Tindall, Gerald Touak, Audrey Phan, Martin Krauss, Kristina Kirchner, Thomas Benjamin Seiler, Henner Hollert, Werner Brack
Among all the nuclear-receptor mediated endocrine disruptive effects, antiandrogenicity is frequently observed in aquatic environments and may pose a risk to aquatic organisms. Linking these effects to responsible chemicals is challenging and a great share of antiandrogenic activity detected in the environment has not been explained yet. To identify drivers of this effect at a hot spot of antiandrogenicity in the German river Holtemme, we applied effect-directed analysis (EDA) including a parallel fractionation approach, a downscaled luciferase reporter gene cell-based anti-AR-CALUX assay and LC-HRMS/MS non-target screening...
December 6, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29211465/gene-co-expression-networks-drive-and-predict-reproductive-effects-in-daphnia-in-response-to-environmental-disturbances
#11
J Asselman, M E Pfrender, J A Lopez, J R Shaw, Kac De Schamphelaere
Increasing effects of anthropogenic stressors and those of natural origin on aquatic ecosystems have intensified the need for predictive and functional models of their effects. Here, we use gene expression patterns in combination with weighted gene co-expression networks and generalized additive models to predict effects on reproduction in the aquatic microcrustacean Daphnia. We developed models to predict effects on reproduction upon exposure to different cyanobacteria, different insecticides and binary mixtures of cyanobacteria and insecticides...
December 6, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29211464/the-case-against-charge-transfer-interactions-in-dissolved-organic-matter-photophysics
#12
Garrett McKay, Julie Ann Korak, Paul R Erickson, Douglas E Latch, Kristopher McNeill, Fernando L Rosario-Ortiz
The optical properties of dissolved organic matter influence chemical and biological processes in all aquatic ecosystems. Organic matter optical properties have been attributed to a charge-transfer model in which donor-acceptor complexes play a primary role. This model was evaluated by measuring the absorbance and fluorescence response of organic matter isolates to perturbations in solvent temperature, viscosity, and polarity, which affect the position and intensity of spectra for known donor-acceptor complexes of organic molecules...
December 6, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29209857/feeding-behavior-of-an-aquatic-snail-as-a-simple-endpoint-to-assess-the-exposure-to-cadmium
#13
Álvaro Alonso, Guillermo Valle-Torres
One of the aims of ecotoxicology is the assessment of the effects of chemicals on the ecosystems. Bioassays assessing lethality are frequently used in ecotoxicology, however they usually employ supra-environmental toxic concentrations. Toxicity tests employing behavioral endpoints may present a balance between simplicity (i.e., laboratory bioassays) and complexity (i.e., relevant ecological effects). The aim of this study was to develop a feeding behavioral bioassay with the aquatic snail, Potamopyrgus antipodarum, which included a 2 days exposure to cadmium, followed by a 9 days post-exposure observational period...
December 5, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29209819/developing-reference-criteria-for-the-ecological-status-of-west-african-rivers
#14
Idrissa Kaboré, O Moog, A Ouéda, J Sendzimir, R Ouédraogo, W Guenda, A H Melcher
Awareness of sustainable management of water and its biological resources is rising in West Africa, but application of effective tools for biomonitoring and detecting habitats at risk in aquatic ecosystems is limited. In this study, we provide key environmental descriptors to characterize reference sites by applying the following "a priori criteria" (physical and chemical, hydro-morphological, and land use parameters) by exploring their potential to determine suitable reference sites. Using data collected from 44 sites, we identified 37 criteria that reliably identify reference conditions in semi-arid rivers by reflecting the impacts of multiple pressures ranging from low to very high intensity of human uses and impairments...
December 2, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29209785/sediment-pollution-in-margins-of-the-lake-gua%C3%A3-ba-southern-brazil
#15
Leonardo Capeleto de Andrade, Tales Tiecher, Jessica Souza de Oliveira, Robson Andreazza, Alberto Vasconcellos Inda, Flávio Anastácio de Oliveira Camargo
Sediments are formed by deposition of organic and inorganic particles on depth of water bodies, being an important role in aquatic ecosystems, including destination and potential source of essential nutrients and heavy metals, which may be toxic for living organisms. The Lake Guaíba supplies water for approximately two million people and it is located in the metropolitan region of Porto Alegre, Rio Grande do Sul State, Brazil. Thus, the aim of this study was to evaluate the sediment pollution in the margins of Lake Guaíba in the vicinity of Porto Alegre city...
December 2, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29209281/nitrifier-gene-abundance-and-diversity-in-sediments-impacted-by-acid-mine-drainage
#16
Bhargavi Ramanathan, Andrew M Boddicker, Timberley M Roane, Annika C Mosier
Extremely acidic and metal-rich acid mine drainage (AMD) waters can have severe toxicological effects on aquatic ecosystems. AMD has been shown to completely halt nitrification, which plays an important role in transferring nitrogen to higher organisms and in mitigating nitrogen pollution. We evaluated the gene abundance and diversity of nitrifying microbes in AMD-impacted sediments: ammonia-oxidizing archaea (AOA), ammonia-oxidizing bacteria (AOB), and nitrite-oxidizing bacteria (NOB). Samples were collected from the Iron Springs Mining District (Ophir, CO, United States) during early and late summer in 2013 and 2014...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29208926/altered-expression-of-metabolites-and-proteins-in-wild-and-caged-fish-exposed-to-wastewater-effluents-in-situ
#17
D B D Simmons, J Miller, S Clarence, E S McCallum, S Balshine, B Chandramouli, J Cosgrove, J P Sherry
Population growth has led to increased global discharges of wastewater. Contaminants that are not fully removed during wastewater treatment, such as pharmaceuticals and personal care products (PPCPs), may negatively affect aquatic ecosystems. PPCPs can bioaccumulate causing adverse health effects and behavioural changes in exposed fish. To assess the impact of PPCPs on wild fish, and to assess whether caged fish could be used as a surrogate for resident wild fish in future monitoring, we caged goldfish in a marsh affected by discharges of wastewater effluents (Cootes Paradise, Lake Ontario, Canada)...
December 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29208925/feeding-type-and-development-drive-the-ingestion-of-microplastics-by-freshwater-invertebrates
#18
Christian Scherer, Nicole Brennholt, Georg Reifferscheid, Martin Wagner
Microscopic plastic items (microplastics) are ubiquitously present in aquatic ecosystems. With decreasing size their availability and potential to accumulate throughout food webs increase. However, little is known on the uptake of microplastics by freshwater invertebrates. To address this, we exposed species with different feeding strategies to 1, 10 and 90 µm fluorescent polystyrene spheres (3-3 000 particles mL-1). Additionally, we investigated how developmental stages and a co-exposure to natural particles (e...
December 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29208361/bifurcations-and-global-dynamics-in-a-toxin-dependent-aquatic-population-model
#19
Qihua Huang, Gunog Seo, Chunhua Shan
The study of effects of environmental toxins on ecosystems is of great interest from both environmental and conservation points of view. In this paper, we present a global stability and bifurcation analysis of a toxin-dependent aquatic population model. Our analytical and numerical results show that both the environmental toxin level and the depuration capability of the population significantly affect the population persistence. The model exhibits a multifarious array of dynamics. While low levels of external toxin allow population persistence and high levels of toxin lead to an extirpation, intermediate toxin concentrations can produce very rich dynamics, such as transient oscillations, hysteresis, heteroclinic orbits, and a codimension-two bifurcation...
December 2, 2017: Mathematical Biosciences
https://www.readbyqxmd.com/read/29205792/magnetotaxis-enables-magnetotactic-bacteria-to-navigate-in-flow
#20
Saeed Rismani Yazdi, Reza Nosrati, Corey A Stevens, David Vogel, Peter L Davies, Carlos Escobedo
Magnetotactic bacteria (MTB) play an important role in Earth's biogeochemical cycles by transporting minerals in aquatic ecosystems, and have shown promise for controlled transport of microscale objects in flow conditions. However, how MTB traverse complex flow environments is not clear. Here, using microfluidics and high-speed imaging, it is revealed that magnetotaxis enables directed motion of Magnetospirillum magneticum over long distances in flow velocities ranging from 2 to 1260 µm s-1 , corresponding to shear rates ranging from 0...
December 4, 2017: Small
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