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https://www.readbyqxmd.com/read/28922515/increased-resource-use-efficiency-amplifies-positive-response-of-aquatic-primary-production-to-experimental-warming
#1
James M Hood, Jonathan P Benstead, Wyatt F Cross, Alexander D Huryn, Philip W Johnson, Gísli M Gíslason, James R Junker, Daniel Nelson, Jón S Ólafsson, Chau Tran
Climate warming is affecting the structure and function of river ecosystems, including their role in transforming and transporting carbon (C), nitrogen (N), and phosphorus (P). Predicting how river ecosystems respond to warming has been hindered by a dearth of information about how otherwise well-studied physiological responses to temperature scale from organismal to ecosystem levels. We conducted an ecosystem-level temperature manipulation to quantify how coupling of stream ecosystem metabolism and nutrient uptake responded to a realistic warming scenario...
September 18, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28921305/allocation-of-metals-and-trace-elements-in-different-tissues-of-piscivorous-species-phalacrocorax-carbo
#2
Hribšek Irena, Jovičić Katarina, Karadžić Branko, Skorić Stefan
Great cormorants (Phalacrocorax carbo) are piscivorous birds, and as apex predators they accumulate high levels of contaminants from the aquatic ecosystems. In the present study, we analyzed distribution of Al, Cd, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Sr, and Zn in ten tissues (muscle, liver, kidney, spleen, gizzard, heart, skin, lard, breast feathers, and remiges) of the Great cormorants in the Marin Sprud locality, the Danube River, Serbia. Concentrations of elements in tissues were assessed by using inductively coupled plasma optical spectrometry...
September 18, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28920759/spatial-distribution-of-polycyclic-aromatic-hydrocarbon-and-polychlorinated-biphenyl-sources-in-the-nakdong-river-estuary-south-korea
#3
Jun H Lee, Han J Woo, Kap S Jeong, Jeong W Kang, Jae U Choi, Eun J Jeong, Kap S Park, Dong H Lee
Our research team investigated the elemental composition and the presence of various toxic organic compounds, such as polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs), in estuary surface sediments to trace the spatial distribution of the sources of pollution deposited in Nakdong River, Busan, South Korea. The spatial patterns of elemental composition and toxic organic compounds were determined from the measurements of total organic carbon (TOC), total nitrogen, total sulfur, PAHs, and PCBs...
September 18, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28920171/an-investigation-of-the-host-specificity-of-metacercariae-of-species-of-apophallus-digenea-heterophyidae-in-freshwater-fishes-using-morphological-experimental-and-molecular-methods
#4
Diána Sándor, Kálmán Molnár, David I Gibson, Csaba Székely, Gábor Majoros, Gábor Cech
Metacercariae of species of the genus Apophallus Lühe, 1909, infecting the fins and skin of freshwater fishes, frequently cause black spot disease. Two species, Apophallus muehlingi (Jägerskiöld, 1899) and A. donicus (Skrjabin & Lindtrop, 1919), are known to occur in Hungarian fishes. It has generally been thought that metacercariae of A. muehlingi infect cyprinid fishes, whereas those of A. donicus develop in percids. As part of a morphological, experimental and molecular study, metacercariae were collected from 99 infected specimens of five cyprinid hosts (Abramis brama, Blicca bjoerkna, Chondrostoma nasus, Squalius cephalus, Scardinius erythrophthalmus) and 18 infected specimens of two percid hosts (Gymnocephalus cernua, Perca fluviatilis) in Hungarian natural waters (Lake Balaton, River Danube)...
September 17, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28919946/cytogenetic-characterization-of-hoplias-malabaricus-bloch-1794-from-the-ctalamochita-river-c%C3%A3-rdoba-argentina-first-evidence-for-southernmost-populations-of-this-species-complex-and-comments-on-its-biogeography
#5
Diego Javier Grassi, Ana Claudia Swarça, Jorge Abdala Dergam, María Cristina Pastori, Alberto Sergio Fenocchio
Hoplias malabaricus (Bloch, 1794), a predatory freshwater fish with a wide distribution throughout South America, represents a species complex with seven well characterized karyomorphs at the cytogenetic level. Although this species has been extensively studied in several Brazilian basins, data are still scarce for hydrographic systems from other South American countries. This study aims to characterize cytogenetically the Hoplias malabaricus populations from the Argentinean Central Region, close to the southernmost distribution of this species complex...
2017: Comparative Cytogenetics
https://www.readbyqxmd.com/read/28919506/the-role-of-climatic-cycles-and-trans-saharan-migration-corridors-in-species-diversification-biogeography-of-psammophis-schokari-group-in-north-africa
#6
Duarte Vasconcelos Gonçalves, Fernando Martínez-Freiría, Pierre-André Crochet, Philippe Geniez, Salvador Carranza, José Carlos Brito
Highlands, hydrographic systems and coastal areas have been hypothesised to form corridors across the hyperarid Sahara desert in North Africa, allowing dispersal and gene flow for non-xeric species. Here we aim to provide a genetic test for the trans-Saharan corridor model, and predict the location and stability of ecological-corridors, by combining phylogeography and palaeoclimatic modelling. The model was the Psammophis schokari (Schokari sand racer) group, fast-moving and widely distributed generalist colubrids occurring mostly in arid and semiarid scrublands...
September 14, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28919010/germ-cell-proliferation-and-apoptosis-during-testicular-regression-in-a-seasonal-breeding-fish-kept-in-captivity
#7
Yves Moreira Ribeiro, Santer Alvares de Matos, Fabricio Flavio Theophilo Domingos, Helio Batista Dos Santos, Augusto Bicalho Cruz Vieira, Nilo Bazzoli, Elizete Rizzo
Cell proliferation and apoptosis regulate germ cells stock and sperm production, eliminate anomalous gametes, and are essential parameters to consider in fish farming. Herein, spermatogenic activity as well as germ cell proliferation and apoptosis were assessed in Leporinus taeniatus, a seasonal breeding species from the São Francisco River basin, Brazil. Testes of 24 adult fishes from a farming station were sampled between December and July and processed for light and transmission electron microscopy and immunohistochemistry for PCNA and TUNEL assay...
September 12, 2017: Tissue & Cell
https://www.readbyqxmd.com/read/28918639/identification-of-novel-hydrogen-substituted-polyfluoroalkyl-ether-sulfonates-in-environmental-matrices-near-metal-plating-facilities
#8
Yongfeng Lin, Ting Ruan, Aifeng Liu, Guibin Jiang
Environmental occurrence and behaviors of 6:2 chlorinated polyfluoroalkyl ether sulfonate (Cl-6:2 PFESA, with trade name F-53B) have been received increasing attention recently. Nevertheless, its potential fates under diversified conditions remain concealed. In this study, susceptibility of Cl-6:2 PFESA to reductive dehalogenation was tested in an anaerobic super-reduced cyanocobalamin assay. A rapid transformation of dosed Cl-6:2 PFESA was observed, with a hydrogen-substituted polyfluoroalkyl ether sulfonate (1H-6:2 PFESA) identified as the predominant product by a non-target screening workflow...
September 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28918635/optimization-of-the-determination-method-for-dissolved-cyanobacterial-toxin-bmaa-in-natural-water
#9
Boyin Yan, Zhiquan Liu, Rui Huang, Yongpeng Xu, Dongmei Liu, Tsair-Fuh Lin, Fuyi Cui
There is a serious dispute on the existence of β-N-methylamino-L-alanine (BMAA) in water, which is a neurotoxin that may cause Amyotrophic lateral sclerosis/Parkinson's disease (ALS/PDC) and Alzheimer' disease. It is believed that a reliable and sensitive analytical method for the determination of BMAA is urgently required to resolve this dispute. In the present study, the solid phase extraction (SPE) procedure and the analytical method for dissolved BMAA in water were investigated and optimized. The results showed both derivatized and underivatized methods were qualified for the measurement of BMAA and its isomer in natural water, and the limit of detection and the precision of the two methods were comparable...
September 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28918553/characteristic-of-microplastics-in-the-atmospheric-fallout-from-dongguan-city-china-preliminary-research-and-first-evidence
#10
Liqi Cai, Jundong Wang, Jinping Peng, Zhi Tan, Zhiwei Zhan, Xiangling Tan, Qiuqiang Chen
Microplastic pollution has exhibited a global distribution, including seas, lakes, rivers, and terrestrial environment in recent years. However, little attention was paid on the atmospheric environment, though the fact that plastic debris can escape as wind-blown debris was previously reported. Thus, characteristics of microplastics in the atmospheric fallout from Dongguan city were preliminarily studied. Microplastics of three different polymers, i.e., PE, PP, and PS, were identified. Diverse shapes of microplastics including fiber, foam, fragment, and film were found, and fiber was the dominant shape of the microplastics...
September 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28918369/the-development-of-biodiversity-conservation-measures-in-china-s-hydro-projects-a-review
#11
REVIEW
Ruiqiao Bai, Xuehua Liu, Xiaofei Liu, Lanmei Liu, Jianping Wang, Sihui Liao, Annah Zhu, Zhouyuan Li
The hydropower capacity of China ranks first in the world and accounts for approximately 20% of the total energy production in the country. While hydropower has substantially contributed to meeting China's renewable energy targets and providing clean energy to rural areas, the development of hydropower in China has been met with significant controversy. Ecologically, hydro projects alter the landscape, with potential impacts to the country's aquatic biodiversity. Over the past four decades in China, various mainstream opinions and misunderstandings have been presented concerning how to alleviate the negative impacts of hydro projects on aquatic ecosystems...
September 14, 2017: Environment International
https://www.readbyqxmd.com/read/28918336/total-and-cytosolic-concentrations-of-twenty-metals-metalloids-in-the-liver-of-brown-trout-salmo-trutta-linnaeus-1758-from-the-karstic-croatian-river-krka
#12
Zrinka Dragun, Vlatka Filipović Marijić, Nesrete Krasnići, Dušica Ivanković, Damir Valić, Jakov Žunić, Damir Kapetanović, Irena Vardić Smrzlić, Zuzana Redžović, Ivana Grgić, Marijana Erk
Total and cytosolic concentrations of twenty metals/metalloids in the liver of brown trout Salmo trutta (Linnaeus, 1758) were studied in the period from April 2015 to May 2016 at two sampling sites on Croatian river Krka, to establish if river water contamination with metals/metalloids downstream of Knin town has influenced metal bioaccumulation in S. trutta liver. Differences were observed between two sites, with higher concentrations of several elements (Ag, As, Ca, Co, Na, Se, Sr, V) found downstream of Knin town, whereas few others (Cd, Cs, Mo, Tl) were, unexpectedly, increased at the Krka River spring...
September 14, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28918279/seasonal-variation-of-chloro-s-triazines-in-the-hartbeespoort-dam-catchment-south-africa
#13
Cornelius Rimayi, David Odusanya, Jana M Weiss, Jacob de Boer, Luke Chimuka
Seasonal variation of eight chloro-s-triazine herbicides and seven major atrazine and terbuthylazine degradation products was monitored in the Hartbeespoort Dam catchment using gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-mass spectrometry (LC-MS/MS). Lake, river and groundwater were sampled from the Hartbeespoort Dam catchment over four seasons and the downstream Jukskei River was monitored during the winter season. Triazine herbicide concentrations in the Hartbeespoort Dam were in the order atrazine>simazine>propazine>ametryn>prometryn throughout the four seasons sampled...
September 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28918278/heavy-metals-as-hg-and-v-and-stable-isotope-ratios-%C3%AE-13-c-and-%C3%AE-15-n-in-fish-from-yellow-river-estuary-china
#14
Yuan Liu, Guijian Liu, Zijiao Yuan, Houqi Liu, Paul K S Lam
The Yellow River Estuary is a significant fishery, but at present there are few studies about the concentrations of arsenic (As), mercury (Hg) and vanadium (V) in fish from this area, which might cause potential health risk to fish consumers. The aim of this study was to research on the accumulation and potential sources of heavy metals in the fish of the Yellow River Estuary. Arsenic, Hg, V and stable isotope ratios (δ(15)N and δ(13)C) in 11 species of 129 fish were analyzed. Results showed that the concentrations of As and Hg were all lower than the guideline levels established by international organizations and legal limits by several countries...
September 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28918006/factors-influencing-organochlorine-pesticides-distribution-in-the-brisbane-river-estuarine-sediment-australia
#15
Godfred Odame Duodu, Ashantha Goonetilleke, Godwin A Ayoko
Sediment samples collected from Brisbane River were analysed for organochlorine pesticide residues (OCPs). The factors influencing OCPs distribution in the sediment were investigated using multivariate analytical tools. Thirteen OCPs were detected in the sediment with concentrations ranging between below detection to 83.9ng/g, and detection frequency >90%. With the exception of dieldrin, the OCP inputs appear to be historical and may cause adverse ecological impacts. Multi-criteria ranking of the factors influencing the OCPs (except dieldrin) distribution in the sediment revealed that TOC>silt>intensive urban land use>population>seasons...
September 13, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28917800/%C3%AE-cyclodextrins-incorporated-multi-walled-carbon-nanotubes-modified-electrode-for-the-voltammetric-determination-of-the-pesticide-dichlorophen
#16
Karolina Sipa, Mariola Brycht, Andrzej Leniart, Paweł Urbaniak, Agnieszka Nosal-Wiercińska, Bartłomiej Pałecz, Sławomira Skrzypek
In this work, a glassy carbon electrode modified with β-cyclodextrins and multi-walled carbon nanotubes (β-CDs/MWCNTs/GCE) was constructed and applied for the square-wave adsorptive stripping voltammetric (SWAdSV) determination of the pesticide dichlorophen (Dcp). For the first time, this compound was electrochemically investigated. The voltammetric measurements were conducted in phosphate buffer (PBS) at pH 6.5 as a supporting electrolyte, and SWAdSV technique parameters were optimized. A linear calibration curve in the wide concentration range from 5...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917764/coupling-dispersive-liquid-liquid-microextraction-to-inductively-coupled-plasma-atomic-emission-spectrometry-an-oxymoron
#17
David Martínez, Daniel Torregrosa, Guillermo Grindlay, Luis Gras, Juan Mora
Coupling dispersive liquid-liquid micro-extraction (DLLME) to inductively coupled plasma atomic emission spectrometry (ICP-AES) is usually troublesome due to the limited plasma tolerance to the organic solvents usually employed for metal extraction. This work explores different coupling strategies allowing the multi-element determination by ICP-AES of the solutions obtained after DLLME procedures. To this end, three of the most common extractant solvents in DLLME procedures (1-undecanol, 1-butyl-3-methyl-imidazolium hexafluorophosphate and chloroform) have been selected to face most of the main problems reported in DLLME-ICP-AES coupling (i...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917749/trace-determination-of-volatile-polycyclic-aromatic-hydrocarbons-in-natural-waters-by-magnetic-ionic-liquid-based-stir-bar-dispersive-liquid-microextraction
#18
Juan L Benedé, Jared L Anderson, Alberto Chisvert
In this work, a novel hybrid approach called stir bar dispersive liquid microextraction (SBDLME) that combines the advantages of stir bar sorptive extraction (SBSE) and dispersive liquid-liquid microextraction (DLLME) has been employed for the accurate and sensitive determination of ten polycyclic aromatic hydrocarbons (PAHs) in natural water samples. The extraction is carried out using a neodymium stir bar magnetically coated with a magnetic ionic liquid (MIL) as extraction device, in such a way that the MIL is dispersed into the solution at high stirring rates...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917735/trace-analysis-of-nitrite-ions-in-environmental-samples-by-using-in-situ-synthesized-zein-biopolymeric-nanoparticles-as-the-novel-green-solid-phase-extractor
#19
Amir Hatamie, Mahmoud Nassiri, Meghdad Doust Alivand, Amit Bhatnagar
For the first time, a novel green method using Zein biopolymeric nanoparticles as a green dispersive solid-phase extractor is reported for the separation and preconcentration of trace amount of nitrite (NO2(-)) ions in ppb levels. The Zein protein is a biodegradable hydrophobic plant protein that is obtained from corn and is composed of a number of hydrophobic amino acids. Zein bionanoparticles were synthesized in an anti-solvent process and used as a new biosorbent in the extraction technique. In the proposed technique, by using a standard method at first, a mixture of 1-naphthylamine and sulphanilic acid as selective regents was added to the samples, and in the presence of the nitrite ion, a red azo product was formed...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917213/hydraulic-connectivity-and-evaporation-control-the-water-quality-and-sources-of-chromophoric-dissolved-organic-matter-in-lake-bosten-in-arid-northwest-china
#20
Lei Zhou, Yongqiang Zhou, Yang Hu, Jian Cai, Chengrong Bai, Keqiang Shao, Guang Gao, Yunlin Zhang, Erik Jeppesen, Xiangming Tang
Lake Bosten is the largest oligosaline lake in arid northwestern China, and water from its tributaries and evaporation control the water balance of the lake. In this study, water quality and chromophoric dissolved organic matter (CDOM) absorption and fluorescence were investigated in different seasons to elucidate how hydraulic connectivity and evaporation may affect the water quality and variability of CDOM in the lake. Mean suspended solids and turbidity were significantly higher in the upstream tributaries than in the lake, the difference being notably more pronounced in the wet than in the dry season...
September 6, 2017: Chemosphere
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