keyword
MENU ▼
Read by QxMD icon Read
search

Estuary

keyword
https://www.readbyqxmd.com/read/28441595/modelling-drivers-and-distribution-of-lead-and-zinc-concentrations-in-soils-of-an-urban-catchment-sydney-estuary-australia
#1
L E Johnson, T F A Bishop, G F Birch
The human population is increasing globally and land use is changing to accommodate for this growth. Soils within urban areas require closer attention as the higher population density increases the chance of human exposure to urban contaminants. One such example of an urban area undergoing an increase in population density is Sydney, Australia. The city also possesses a notable history of intense industrial activity. By integrating multiple soil surveys and covariates into a linear mixed model, it was possible to determine the main drivers and map the distribution of lead and zinc concentrations within the Sydney estuary catchment...
April 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28441575/estimates-of-recovery-of-the-penobscot-river-and-estuarine-system-from-mercury-contamination-in-the-1960-s
#2
Peter H Santschi, Kevin M Yeager, Kathleen A Schwehr, Kimberly J Schindler
Mercury (Hg) was discharged in the late 1960s into the Penobscot River by a chlor-alkali production facility, HoltraChem. Using total Hg concentration profiles from 56 stations (58 sediment cores) in the Penobscot River (PBR), Mendall Marsh (MM), Orland River (OR) and Penobscot Estuary (ES), and sediment accumulation rates derived using detailed profiles of total Hg concentrations and radionuclide activities ((137)Cs, (239,240)Pu, (210)Pb), recovery from system-wide Hg pollution was assessed. Total Hg concentration profiles showed sharp maxima at depths attributed in time to a 1967 release date, and were divided into two sections: the first 21years (1967-1988; rapid recovery), and the recent 21years (1988-2009; slower recovery)...
April 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28437922/from-toes-to-top-of-atmosphere-fowler-s-sneaker-depth-index-of-water-clarity-for-the-chesapeake-bay
#3
Benjamin Crooke, Lachlan I W McKinna, Ivona Cetinić
Fowler's Sneaker Depth (FSD), analogous to the well known Secchi disk depth (Zsd), is a visually discerned citizen scientist metric used to assess water clarity in the Patuxent River estuary. In this study, a simple remote sensing algorithm was developed to derive FSD from space-borne spectroradiometric imagery. An empirical model was formed that estimates FSD from red-end remote sensing reflectances at 645 nm, Rrs(645). The model is based on a hyperbolic function relating water clarity to Rrs(645) that was established using radiative transfer modeling and fine tuned using in-water FSD measurements and coincident Rrs(645) data observed by NASA's Moderate Resolution Imaging Spectroradiometer aboard the Aqua spacecraft (MODISA)...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28434669/diurnal-variation-of-co2-ch4-and-n2o-emission-fluxes-continuously-monitored-in-situ-in-three-environmental-habitats-in-a-subtropical-estuarine-wetland
#4
Wen-Bin Yang, Chung-Shin Yuan, Chuan Tong, Pin Yang, Lei Yang, Bang-Qin Huang
Wetlands play a crucial role in modulating atmospheric concentrations of greenhouse gases (GHGs) such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). The key factors controlling GHG emission from subtropical estuarine wetlands were investigated in this study, which continuously monitored the uptake/emission of GHGs (CO2, CH4, and N2O) by/from a subtropical estuarine wetland located in the Minjiang estuary in the coastal region of southeastern China. A self-designed floating chamber was used to collect air samples on-site at three environmental habitats (Phragmites australis marsh, mudflats, and river water)...
April 20, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28434666/heavy-metal-distribution-and-contamination-status-in-the-sedimentary-environment-of-cochin-estuary
#5
P M Salas, C H Sujatha, C S Ratheesh Kumar, Eldhose Cheriyan
Heavy metals (Fe, Mn, Cr, Zn, Ni, Pb, Cu, Co and Cd) in the surface sediments of Cochin estuary, Southwest coast of India were analyzed to understand the spatio-temporal variation and contamination status via six sampling campaigns. Pollution indices like enrichment factor, geoaccumulation index and pollution load index inferred that the sediments of the northern arm of the estuary exhibited severe trace metal accumulation. Numerical sediment quality guidelines were applied to assess adverse biological effects of the trace metals, suggesting that occasional biological effect may occur due to Cr, Cu, Ni and Pb...
April 20, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28433818/spatial-temporal-variability-and-transportation-mechanism-of-polychlorinated-biphenyls-in-the-yangtze-river-estuary
#6
Lei Chen, Ye Yang, Jing Chen, Shuohan Gao, Shasha Qi, Cheng Sun, Zhenyao Shen
Although the variability of polychlorinated biphenyls (PCBs) is strongly dependent on the hydro-sediment pattern, the quantification of this interaction is still not well described, especially for estuary areas. In this study, both chemical analyses and numerical simulation were conducted to explain the temporal-spatial variability and transportation mechanism of PCBs in the Yangtze River Estuary (YRE). The impacts of the upstream Three Gorges Dam (TGD) on estuarine PCBs were also addressed with a simulated scenario...
April 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28433395/distribution-enrichment-and-source-of-heavy-metals-in-rizhao-offshore-area-southeast-shandong-province
#7
Hongying Song, Jinqing Liu, Ping Yin, Yong Zhang
50 surface sediments were collected from Rizhao offshore area to determine heavy metals (Cu, Pb, Zn, Cr, Cd, As, Hg) pollution. High heavy metal values were located near the two ports in the north and south study areas, which was consistent with the distribution of fine-grained sediments. According to threshold effect level (TEL) and probable effect level (PEL), Cu and As had occasionally adverse biological effects on the aquatic ecosystems. The enrichment factor (EF) values showed that most of the study area was moderate or moderately severe enrichment for As, and minor enrichment for Pb, but Hg was only moderately enriched in the river estuaries...
April 19, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28432496/reproductive-effects-of-life-cycle-exposure-to-difenoconazole-on-female-marine-medaka-oryzias-melastigma
#8
Xiaocui Dong, Zhenghong Zuo, Jiaojiao Guo, Hongbin Li, Lemeng Zhang, Meng Chen, Zhibin Yang, Chonggang Wang
Difenoconazole (DFZ) is a widely used triazole fungicide which has been detected in some estuaries and embayments. This study was conducted to investigate the effects of DFZ on ovarian development in female marine medaka (Oryzias melastigma). After 180 days exposure of the embryo to DFZ (0, 1, 10, 100 and 1000 ng/L), the gonadosomatic index and percentage of mature oocytes produced were significantly reduced in the 1, 10 and 100 ng/L treatments but not the 1000 ng/L treatment compared to the control, thus exhibiting a U-shaped dose response curve...
April 21, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28431763/immune-response-of-the-short-neck-clam-paphia-malabarica-to-salinity-stress-using-flow-cytometry
#9
Deodatta S Gajbhiye, Lidita Khandeparker
Paphia malabarica is a predominant and commercially important bivalve in India, persistently challenged by wavering salinity in a monsoon-influenced estuary. To examine the organism's immunological response under such a condition we challenged P. malabarica with different salinities (0, 5, 15, 25 and 35) for varied periods using a two-way experimental approach (in vitro and in vivo). This is the first study to report the response of P. malabarica hemocytes to salinity stress from a monsoon-influenced estuary on the southwest coast of India...
April 11, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28429823/changes-in-the-gut-microbiome-of-the-chinese-mitten-crab-eriocheir-sinensis-in-response-to-white-spot-syndrome-virus-wssv-infection
#10
Z F Ding, M J Cao, X S Zhu, G H Xu, R L Wang
Intestinal microorganisms play important roles in maintaining host health, but their functions in aquatic animal hosts have yet to be fully elucidated. The Chinese mitten crab, Eriocheir sinensis, is one such example. We attempted to identify the shift of gut microbiota that occurred in response to infection of white spot syndrome virus (WSSV), an emerging viral pathogen in the crab aquaculture industry. The microbiota may exert some control over aspects of the viral pathogenesis. We investigated the changes in composition and structure of the crab gut microbiome during various WSSV infection stages of 6 h post-infection (hpi) and 48 hpi, using a 16S rRNA approach on the MiSeq Illumina sequencing platform...
April 21, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/28426983/constraining-the-temporal-variations-of-ra-isotopes-and-rn-in-the-groundwater-end-member-implications-for-derived-sgd-estimates
#11
Marc Cerdà-Domènech, Valentí Rodellas, Albert Folch, Jordi Garcia-Orellana
Submarine groundwater discharge (SGD) has been recognized as an important supplier of chemical compounds to the ocean that may influence coastal geochemical cycles. Radium isotopes ((223)Ra, (224)Ra, (226)Ra,(228)Ra) and radon ((222)Rn) have been widely applied as tracers of SGD. Their application requires the appropriate characterization of both the concentrations of tracers in the discharging groundwater and their distribution in the coastal water column. This study evaluates the temporal evolution of Ra isotopes and (222)Rn concentrations in a dynamic subterranean estuary of a microtidal Mediterranean coastal aquifer that experiences large displacements of the fresh-saltwater interface as a necessary initial step in evaluating the influence of SGD in coastal waters...
April 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28424941/isolation-and-complete-genome-sequence-of-a-novel-pseudoalteromonas-phage-ph357-from-the-yangtze-river-estuary
#12
Zheng Gong, Min Wang, Qingwei Yang, Zhongshi Li, Jun Xia, Yu Gao, Yong Jiang, Xue Meng, Zhaoyang Liu, Ding Yang, Fangfei Zhang, Hongbing Shao, Duobing Wang
Phage PH357, a novel lytic Pseudoalteromonas lipolytica phage belonging to the Myoviridae family was isolated from the Yangtze River estuary. The microbiological characterization demonstrated that phage PH357 is stable from -20 to 60 °C and the optimal pH 7. The one-step growth curve showed a latent period of 20 min, a rise period of 20 min, and the average burst size was about 85 virions per cell. Complete genome of phage PH357 was determined. Genome of phage PH357 consisted of a linear, double-stranded 136,203 bp DNA molecule with 34...
April 20, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28421527/spatio-temporal-assessment-and-trend-analysis-of-surface-water-salinity-in-the-coastal-region-of-bangladesh
#13
Mashura Shammi, Md Mostafizur Rahman, Md Atikul Islam, Md Bodrud-Doza, Anwar Zahid, Yeasmin Akter, Samia Quaiyum, Masaaki Kurasaki
The study was designed to collect water samples over two seasons-wet-monsoon season (n = 96) (March-April) and dry-monsoon season (n = 44) (September-October)-to understand the seasonal variation in anion and cation hydrochemistry of the coastal rivers and estuaries contributing in the spatial trend in salinity. Hydrochemical examination of wet-monsoon season primarily revealed Ca-Mg-HCO3 type (66%) and followed by Na-Cl type (17.70%) water. In the dry-monsoon season, the scenario reversed with primary water being Na-Cl type (52...
April 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28419962/temporal-trends-of-pbdes-and-emerging-flame-retardants-in-belugas-from-the-st-lawrence-estuary-canada-and-comparisons-with-minke-whales-and-canadian-arctic-belugas
#14
Antoine E Simond, Magali Houde, Véronique Lesage, Jonathan Verreault
An exponential level increase of the ubiquitous halogenated flame retardant (HFR) class polybrominated diphenyl ether (PBDE) has been documented during the 1990s in endangered belugas (Delphinapterus leucas) from the St. Lawrence Estuary (SLE), Eastern Canada. The recent worldwide bans and regulations of PBDE mixtures led to their replacement by alternative HFRs (so-called emerging HFRs) that are increasingly being reported in various environmental compartments. There are, however, limited knowledge on the spatial and temporal trends of PBDEs and emerging HFRs in cetaceans, especially after restrictions on PBDE usage...
April 15, 2017: Environmental Research
https://www.readbyqxmd.com/read/28418218/regulation-of-salt-marsh-mosquito-populations-by-the-18-6-year-lunar-nodal-cycle
#15
Ilia Rochlin, James T Morris
The 18.6-year lunar-nodal cycle drives changes in tidal amplitude globally, affecting coastal habitat formation, species and communities inhabiting rocky shores, and salt marsh vegetation. However, the cycle's influence on salt marsh fauna lacked sufficient long-term data for testing its effect. We circumvented this problem by using salt marsh mosquito records obtained over a period of over four decades in two estuaries in the northeastern USA. Salt marsh mosquito habitat is near the highest tide level where the impact of the nodal cycle on flood frequency is greatest...
April 18, 2017: Ecology
https://www.readbyqxmd.com/read/28417327/influence-of-land-use-and-land-cover-on-the-spatial-variability-of-dissolved-organic-matter-in-multiple-aquatic-environments
#16
Shatrughan Singh, Padmanava Dash, Saurav Silwal, Gary Feng, Ardeshir Adeli, Robert J Moorhead
Water quality of lakes, estuaries, and coastal areas serves as an indicator of the overall health of aquatic ecosystems as well as the health of the terrestrial ecosystem that drains to the water body. Land use and land cover plays not only a significant role in controlling the quantity of the exported dissolved organic matter (DOM) but also influences the quality of DOM via various biogeochemical and biodegradation processes. We examined the characteristics and spatial distribution of DOM in five major lakes, in an estuary, and in the coastal waters of the Mississippi, USA, and investigated the influence of the land use and land cover of their watersheds on the DOM composition...
April 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28414921/distinct-distribution-patterns-of-proteobacterial-nirk-and-nirs-type-denitrifiers-in-the-yellow-river-estuary-china
#17
Fenge Li, Mingcong Li, Wenchong Shi, Han Li, Zhongtao Sun, Zheng Gao
Denitrification was considered to be the critical process removing reactive nitrogen in estuarine ecosystem. In the present study, the abundance, diversity and community structure of nirK- and nirS-type denitrifiers were compared in sediments from the Yellow River estuary. Quantitative PCR (qPCR) showed that the abundance of the two types denitrifiers performed different distribution patterns among the samples, indicating their distinct habitat preference. Phylogenetic analysis revealed that the most sequences from cluster Ⅰ, Ⅲ, Ⅳ, Ⅴ for nirK-type denitrifiers were dominant distributed at the lower dissolved oxygen (DO) sites and sequences in other clusters were dominant at higher DO area...
April 17, 2017: Canadian Journal of Microbiology
https://www.readbyqxmd.com/read/28414338/open-path-spectroscopic-methane-detection-using-a-broadband-monolithic-distributed-feedback-quantum-cascade-laser-array
#18
Anna P M Michel, Jason Kapit, Mark F Witinski, Romain Blanchard
Methane is a powerful greenhouse gas that has both natural and anthropogenic sources. The ability to measure methane using an integrated path length approach such as an open/long-path length sensor would be beneficial in several environments for examining anthropogenic and natural sources, including tundra landscapes, rivers, lakes, landfills, estuaries, fracking sites, pipelines, and agricultural sites. Here a broadband monolithic distributed feedback-quantum cascade laser array was utilized as the source for an open-path methane sensor...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28413230/the-relative-effects-of-upwelling-and-river-flow-on-the-phytoplankton-diversity-patterns-in-the-ria-of-a-coru%C3%A3-a-nw-spain
#19
Antonio Bode, Manuel Varela, Ricardo Prego, Fernando Rozada, Martin D Santos
Phytoplankton species assemblages in estuaries are connected to those in rivers and marine environments by local hydrodynamics leading to a continuous flow of taxa. This study revealed differential effects of upwelling and river flow on phytoplankton communities observed in 2011 along a salinity gradient from a river reservoir connected to the sea through a ria-marine bay system in A Coruña (NW Spain, 43° 16-21' N, 8° 16-22' W). With 130 phytoplankton taxa identified, the assemblages were dominated in general by diatoms, particularly abundant in the bay and in the estuary, but also by chlorophycea and cyanobacteria in the reservoir...
2017: Marine Biology
https://www.readbyqxmd.com/read/28412626/quantification-of-heat-shock-protein-70-and-acetylcholinesterase-over-a-time-course-suggests-environmental-adaptation-in-a-foundational-molluscan-species
#20
Andrew Ravaschiere, Caroline Cutler, Kristi Edleson, Zachery Halem, Henry Magun, Fred Meckler, Rachel Cox
Waterways in urban areas often act as repositories for sewage, industrial waste, and environmental contaminants. In response, inhabitants of these watersheds undergo physiological adaptations specific to their respective environments. Effects of these stressors can be assayed by quantification of various well-documented biomarkers in sentinel species such as the Atlantic Ribbed mussel, Geukensia demissa, a native to the Bronx River Estuary, Bronx, NY, USA. Heat shock protein 70 (Hsp70) is a universally expressed biomarker for an array of environmental stressors including toxins and low dissolved oxygen...
April 13, 2017: Ecotoxicology and Environmental Safety
keyword
keyword
81931
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"