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https://www.readbyqxmd.com/read/28098987/predicting-copper-speciation-in-estuarine-waters-is-dissolved-organic-carbon-a-good-proxy-for-the-presence-of-organic-ligands
#1
Holly Beverley Clare Pearson, Sean David W Comber, Charlotte Braungardt, Paul J Worsfold
A new generation of speciation-based aquatic environmental quality standards (EQS) for metals have been developed using models to predict the free metal ion concentration, the most ecologically relevant form, to set site-specific values. Some countries such as the UK have moved towards this approach by setting a new estuarine and marine water EQS for copper, based on an empirical relationship between copper toxicity to mussels (Mytilus sp.) and ambient dissolved organic carbon (DOC) concentrations. This assumes an inverse relationship between DOC and free copper ion concentration owing to complexation by predominantly organic ligands...
January 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28098236/wind-wave-behavior-in-fetch-and-depth-limited-estuaries
#2
Arash Karimpour, Qin Chen, Robert R Twilley
Wetland dominated estuaries serve as one of the most productive natural ecosystems through their ecological, economic and cultural services, such as nursery grounds for fisheries, nutrient sequestration, and ecotourism. The ongoing deterioration of wetland ecosystems in many shallow estuaries raises concerns about the contributing erosive processes and their roles in restraining coastal restoration efforts. Given the combination of wetlands and shallow bays as landscape components that determine the function of estuaries, successful restoration strategies require knowledge of wind wave behavior in fetch and depth limited water as a critical design feature...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28092769/spatiotemporal-change-of-phosphorous-speciation-and-concentration-in-stormwater-in-the-st-lucie-estuary-watershed-south-florida
#3
Liguang Li, Zhenli He, Zhigang Li, Suli Li, Yongshan Wan, Peter J Stoffella
Phosphorous (P) concentration in stormwater runoff varies at different spatial and temporal scales. Excessive P loading from agriculture system into the St. Lucie Estuary (SLE) contributed to water quality deterioration in southern Indian River Lagoon. This study examines the spatial and temporal shifts of different P forms in runoff and storm water under different land use, water management, and rainfall conditions. Storm water samplings were conducted monthly between April 2013 and December 2014 in typical farmland and along the waterway (Canal C-24) that connects lands to the SLE...
January 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28090765/aggregation-kinetics-of-diesel-soot-nanoparticles-in-wet-environments
#4
Chengyu Chen, Weilin Huang
Soot produced during incomplete combustion consists mainly of carbonaceous nanoparticles (NPs) with severe adverse environmental and health effects, and its environmental fate and transport are largely controlled by aggregation. In this study, we examined the aggregation behavior for diesel soot NPs under aqueous condition in an effort to elucidate the fundamental processes that govern soot particle-particle interactions in wet environments such as rain droplets or surface aquatic systems. The influence of electrolytes and aqueous pH on colloidal stability of these NPs was investigated by measuring their aggregation kinetics in different aqueous solution chemistries...
January 16, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28089552/plankton-resting-stages-in-recent-sediments-of-haifa-port-israel-eastern-mediterranean-distribution-viability-and-potential-environmental-consequences
#5
Fernando Rubino, Manuela Belmonte, Bella S Galil
Resting stages of plankton were sampled in the surficial sediments in the port of Haifa, Israel, on the eve of a major port enlargement project. We recorded the structure of the assemblages and examined their relationship with different environments within the port. Our findings reveal a remarkably high diversity coupled with low density and the highest number of oligotrich ciliate cyst types recorded from marine sediments. Near the eutrophic and highly polluted zone of the Kishon estuary ciliates were more abundant than elsewhere in the port, whereas dinoflagellates' abundance was reduced, and these trends held true both for full and empty cysts...
January 12, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28089551/seasonal-circulation-assessments-of-the-northern-arabian-persian-gulf
#6
Y Alosairi, T Pokavanich
Due to the continuous human activities linked to economic expansion in the Arabian Gulf area (also known as Persian Gulf), various activities have had an adverse impact on the coastal environment. Furthermore, reduction of precipitation and river flows has resulted in alterations to the hydro-environment regime at various levels. The current study uses a detailed numerical model that was validated with recent field measurements to determine the comprehensive seasonal circulations of the Northern Arabian/Persian Gulf (NAG)...
January 12, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28088848/mercury-bioaccumulation-in-estuarine-fishes-novel-insights-from-sulfur-stable-isotopes
#7
James J Willacker, Collin A Eagles-Smith, Joshua T Ackerman
Estuaries are transitional habitats characterized by complex biogeochemical and ecological gradients that result in substantial variation in fish total mercury concentrations (THg). We leveraged these gradients and used carbon (δ(13)C), nitrogen (δ(15)N), and sulfur (δ(34)S) stable isotopes to examine the ecological and biogeochemical processes underlying THg bioaccumulation in fishes from the San Francisco Bay Estuary. We employed a tiered approach that first examined processes influencing variation in fish THg among wetlands, and subsequently examined the roles of habitat and within-wetland processes in generating larger-scale patterns in fish THg...
January 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28088529/effect-of-water-chemistry-on-disinfection-by-product-formation-in-the-complex-surface-water-system
#8
Rongjie Hao, Yan Zhang, Tingting Du, Li Yang, Adeyemi S Adeleye, Yao Li
The relationship between the disinfection by-products (DBPs) formed with chlorination and chloramination techniques and the water chemistry of Haihe River was compared. Samples were collected at 28 different points within the mainstream and tributaries of the river. The DBPs investigated include trihalomethanes (THMs), haloacetic acids (HAAs), haloacetonitriles (HANs), haloketones (HKs), and trichloronitromethane. THMs formed when the samples were chlorinated mostly exceeded 100 and 600 μg/L in the mainstream and tributaries and in the estuary, respectively...
December 8, 2016: Chemosphere
https://www.readbyqxmd.com/read/28088369/assessment-of-human-induced-change-and-biological-risk-posed-by-contaminants-in-estuarine-harbour-sediments-sydney-harbour-estuary-australia
#9
G F Birch
A rapid, simple yet scientifically sound scheme providing two important types of information used in assessment of estuarine sediments is presented. The mean enrichment quotient (MEQ) (fine contemporary sediment metal concentration/fine fraction background metal concentration) for Cu, Pb and Zn provides the magnitude of human-induced change, (deviation from the pristine condition), while sediment quality guidelines (SQGs) assess the risk posed by sedimentary contaminants to the benthic community. Maximum metal enrichment for sediment in Sydney estuary (Australia) is >100 times for Cu, Pb and Zn and the MEQ is >10 times for most of the estuary...
January 11, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28081357/assessment-of-neuronal-cell-based-cytotoxicity-of-neurotoxins-from-an-estuarine-nemertean-in-the-han-river-estuary
#10
Yeo Seon Kwon, Seul Ki Min, Seung Ju Yeon, Jin Ha Hwang, Jae-Sang Hong, Hwa Sung Shin
A heteronemertean, Yininemertes pratensis was collected in Han River Estuary, South Korea. This estuarine nemertean has been known for harmful effects by the local fishermen to the glass eels, juveniles of Japanese eels Anguilla japonica, migrating to fresh water. The present study confirmed the neurotoxic effects of this heteronemertean ribbon worm at the cellular level. 5, 11-dideoxy TTX (288 m/z) and 11-norTTX-6(S)-01 (m/z 305.97), derivative types of neurotoxic TTX, were identified through HPLC and MALDI-TOF MS...
January 12, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28077210/spatial-temporal-and-multi-media-variations-of-polycyclic-aromatic-hydrocarbons-in-a-highly-urbanized-river-from-south-china
#11
Di Zhang, Jun-Jian Wang, Hong-Gang Ni, Hui Zeng
Comprehensive studies on polycyclic aromatic hydrocarbons (PAHs) within an urban river are urgently needed to carry out strategies to limit their contamination and dispersal. Here, we analyzed 16 PAH occurrences in water, suspended particulate matter (SPM), and sediment monthly for a year in the Maozhou River mainstream (Shenzhen, South China). Monthly rainfall positively correlated with both total PAH concentrations in filtered water (water PAHs) and SPM. Sediment PAH concentration increased from the river source to estuary...
January 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28075564/spatio-temporal-trends-of-heavy-metals-in-indo-pacific-humpback-dolphins-sousa-chinensis-from-the-western-pearl-river-estuary-china
#12
Duan Gui, Riqing Yu, Leszek Karczmarski, Yulong Ding, Haifei Zhang, Yong Sun, Mei Zhang, Yuping Wu
We assessed the spatio-temporal trends of the concentrations of 11 heavy metals (HMs) in the liver and kidney of Indo-Pacific humpback dolphins (Sousa chinensis) from western Pearl River Estuary (PRE) during 2004-2015. The hepatic levels of Cr, As and Cu in these dolphins were among the highest reported for cetaceans globally, and the levels of Zn, Cu and Hg were sufficiently high to cause toxicological effects in some of the animals. Between same age-sex groups, dolphins from Lingdingyang were significantly more contaminated with Hg, Se and V than those from the West-four region, while the opposite was true for Cd...
January 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28073507/evidence-of-freshwater-algal-toxins-in-marine-shellfish-implications-for-human-and-aquatic-health
#13
Corinne M Gibble, Melissa B Peacock, Raphael M Kudela
The occurrence of freshwater harmful algal bloom toxins impacting the coastal ocean is an emerging threat, and the potential for invertebrate prey items to concentrate toxin and cause harm to human and wildlife consumers is not yet fully recognized. We examined toxin uptake and release in marine mussels for both particulate and dissolved phases of the hepatotoxin microcystin, produced by the freshwater cyanobacterial genus Microcystis. We also extended our experimental investigation of particulate toxin to include oysters (Crassostrea sp...
November 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073478/mitigating-cyanobacterial-harmful-algal-blooms-in-aquatic-ecosystems-impacted-by-climate-change-and-anthropogenic-nutrients
#14
REVIEW
Hans W Paerl, Wayne S Gardner, Karl E Havens, Alan R Joyner, Mark J McCarthy, Silvia E Newell, Boqiang Qin, J Thad Scott
Mitigating the global expansion of cyanobacterial harmful blooms (CyanoHABs) is a major challenge facing researchers and resource managers. A variety of traditional (e.g., nutrient load reduction) and experimental (e.g., artificial mixing and flushing, omnivorous fish removal) approaches have been used to reduce bloom occurrences. Managers now face the additional effects of climate change on watershed hydrologic and nutrient loading dynamics, lake and estuary temperature, mixing regime, internal nutrient dynamics, and other factors...
April 2016: Harmful Algae
https://www.readbyqxmd.com/read/28073443/a-hab-warning-system-for-shellfish-harvesting-in-portugal
#15
A Silva, L Pinto, S M Rodrigues, H de Pablo, M Santos, T Moita, M Mateus
The development of sustainable shellfish aquaculture is highly dependent on the provision of reliable monitoring and predictive information on the occurrence of harmful algal blooms (HABs). The Portuguese HAB early warning system and shellfish closures presented here is a prototype, developed in the ASIMUTH project. It relies on weekly monitoring data composed of observations of HAB species and toxin concentrations within shellfish, and ocean circulation forecasts generated by an operational oceanographic model...
March 2016: Harmful Algae
https://www.readbyqxmd.com/read/28069300/response-of-microbial-communities-colonizing-salt-marsh-plants-rhizosphere-to-copper-oxide-nanoparticles-contamination-and-its-implications-for-phytoremediation-processes
#16
Joana P Fernandes, C Marisa R Almeida, Federico Andreotti, Leandro Barros, Tânia Almeida, Ana P Mucha
This study aimed to investigate Cu oxide nanoparticles (CuO NP) effect on microbial communities associated with salt marsh plants (Halimione portulacoides and Pragmites australis) rhizosphere and its implications for phytoremediation processes. Experiments were conducted, under controlled conditions, over one week. Rhizosediment soaked in the respective elutriate (a simplified natural medium) with or without plants, was doped with CuO NP or with Cu in ionic form. Microbial community in rhizosediments was characterized in terms of abundance (by DAPI) and structure (by ARISA)...
January 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28065553/trace-element-contamination-in-the-nearshore-sediments-of-the-tamiraparani-estuary-southeast-coast-of-india
#17
N S Magesh, N Chandrasekar, S Krishnakumar, T Simon Peter
The present study focused on the elemental distribution of nearshore environment and to understand the interrelationship between different parameters such as trace elements, organic matter, calcium carbonate and sediment texture. For this purpose, 24 surface samples were collected from the nearshore environment using a stainless steel Van Veen grab sampler. The above said parameters indicate that nearshore sediment transport, contaminants from estuarine source and anthropogenic activities deteriorates the sediment quality in the nearshore area...
January 5, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28065550/nitrogen-extraction-potential-of-wild-and-cultured-bivalves-harvested-from-nearshore-waters-of-cape-cod-usa
#18
Joshua Reitsma, Diane C Murphy, Abigail F Archer, Richard H York
As nitrogen entering coastal waters continues to be an issue, much attention has been generated to identify potential options that may help alleviate this stressor to estuaries, including the propagation of bivalves to remove excess nitrogen. Oysters (Crassostrea virginica) and quahogs (Mercenaria mercenaria) from numerous Cape Cod, MA, (USA) sources were analyzed for nitrogen content stored in tissues that would represent a net removal of nitrogen from a water body if harvested. Results showed local oysters average 0...
January 5, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28063369/physiological-and-biochemical-responses-of-two-keystone-polychaete-species-diopatra-neapolitana-and-hediste-diversicolor-to-multi-walled-carbon-nanotubes
#19
Lucia De Marchi, Victor Neto, Carlo Pretti, Etelvina Figueira, Federica Chiellini, Amadeu M V M Soares, Rosa Freitas
Multi-walled carbon nanotubes (MWCNTs) are one of the most important carbon Nanomaterials (NMs). The production and use of these carbon NMs is increasing rapidly and, therefore, the need to assess their presence in the environment and associated risks has become increasingly important. However, limited literature is available regarding the impacts induced in aquatic organisms by this pollutant, namely in invertebrate species. Diopatra neapolitana and Hediste diversicolor are keystone polychaete species inhabiting estuaries and shallow water bodies intertidal mudflats, frequently used to evaluate the impact of environmental disturbances in these systems...
January 4, 2017: Environmental Research
https://www.readbyqxmd.com/read/28062097/vicissitudes-of-oxidative-stress-biomarkers-in-the-estuarine-crab-scylla-serrata-with-reference-to-dry-and-wet-weather-conditions-in-ennore-estuary-tamil-nadu-india
#20
M G Ragunathan
The primary objective of this study was to understand the impact of monsoon and summer seasons on the Polychlorinated Biphenyls (PCB's) and petroleum hydrocarbon compounds (PHC's) load in Ennore estuary and how the physiological response of estuarine Scylla serrata inhabiting in this estuary changed with reference to antioxidant defense. Seasonal levels of PCB's and PHC's were assessed in the water along with their bioaccumulation in gills, hemolymph, hepatopancreas and ovary of S. serrata. Concentration of PCB's and PHC's in water and their bioaccumulation was found to be higher in summer season when compared to monsoon season...
January 3, 2017: Marine Pollution Bulletin
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