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Wael Skeff, Anna Orlikowska, Detlef E Schulz-Bull
Two LC-MS/MS methods including different sample preparation and quantitative processes showed a good agreement for analysis of the herbicides MCPA, mecoprop, isoproturon, bentazon and chloridazon, and the metabolite chloridazon-methyl-desphenyl (CMD) in estuarine waters. Due to different sensitivity of the methods only one could be used to analyze marine samples. The transport of these compounds to the Baltic Sea via ten German estuaries and their distribution between coastal water and sediments was studied...
October 14, 2016: Marine Pollution Bulletin
Angela Volpe, Michele Pagano, Giuseppe Mascolo, Paola Grenni, Simona Rossetti
The degradation of two of the most frequently used UV-filters was investigated through microcosm studies. Marine sediments sampled from two sites in Italy (La Spezia harbour and Sarno river estuary, S1 and S2 respectively) were used to set up aerobic and anaerobic sets of reactors. The sediments were spiked with a methanol solution of 3-(4-methylbenzylidene)camphor (4-MBC) and 2-ethylhexyl 4-(dimethylamino)benzoate (EH-DPAB), at concentrations of either 25 or 50mgkg(-1) each. Methanol (6.3g/L) also served as an organic amendment and growth substrate for improving microbial activity...
October 14, 2016: Science of the Total Environment
David L Taylor, Jason McNamee, John Lake, Carissa L Gervasi, Danial G Palance
This study evaluated the relative importance of the N arragansett Bay estuary (RI and MA, USA), and associated tidal rivers and coastal lagoons, as nurseries for juvenile winter flounder, Pseudopleuronectes americanus, and summer flounder, Paralichthys dentatus. Winter flounder (WF) and summer flounder (SF) abundance and growth were measured from May to October (2009-2013) and served as indicators for the use and quality of shallow-water habitats (water depth < 1.5-3.0 m). These bioindicators were then analyzed with respect to physiochemical conditions to determine the mechanisms underlying intra-specific habitat selection...
September 2016: Estuaries and Coasts: Journal of the Estuarine Research Federation
Xiutang Yuan, Xiaolong Yang, Anguo Zhang, Xindong Ma, Hui Gao, Guangshui Na, Humin Zong, Guize Liu, Yongguang Sun
Spatial distribution, source apportionment, and potential ecological risks of sixteen polycyclic aromatic hydrocarbons (PAHs) and seven endocrine disrupting compounds (EDCs) in the intertidal sediment at the Shuangtaizi Estuary, Bohai Sea of China were analyzed. Results showed that the total PAH concentrations ranged from 28.79ngg(-1) dw to 281.97ngg(-1) dw (mean: 115.92ngg(-1) dw) and the total EDC concentrations from 0.52ngg(-1) dw to 126.73ngg(-1) dw (mean: 37.49ngg(-1) dw). The distribution pattern for the PAHs was generally different from that of the EDCs possibly due to their distinct sources and n-octanol-/water partition coefficients (KOW)...
October 10, 2016: Marine Pollution Bulletin
Xiao-Ming Lu, Chang Chen, Tian-Ling Zheng
Pyrosequencing and metagenomic profiling were used to assess the phylogenetic and functional characteristics of microbial communities residing in sediments collected from the estuaries of Rivers Oujiang (OS) and Jiaojiang (JS) in the western region of the East China Sea. Another sediment sample was obtained from near the shore far from estuaries, used for contrast (CS). Characterization of estuary sediment bacterial communities showed that toxic chemicals potentially reduced the natural variability in microbial communities, while they increased the microbial metabolic enzymes and pathways...
October 15, 2016: Microbial Ecology
Qifeng Li, Tieyu Wang, Zhaoyun Zhu, Jing Meng, Pei Wang, Sarvajayakesavalu Suriyanarayanan, Yueqing Zhang, Yunqiao Zhou, Shuai Song, Yonglong Lu, Baninla Yvette
Perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) are extremely persistent in the environment, and have the potential for long-range transport. The present study focused on the Daling River and its tributary, a larger river flowing into Liaodong Bay of the Bohai Sea. Recent studies have shown the elevated levels of PFOS and PFOA in the Daling River. Hence, the objective of this study was to investigate the seasonal changes, fate and transport modeling of PFOS and PFOA concentrations using one-dimensional DHI MIKE-11 river model...
October 11, 2016: Chemosphere
Israel Medina-Gómez, Christopher J Madden, Jorge Herrera-Silveira, Björn Kjerfve
This study was undertaken to determine the relationships between the biomass, morphometry, and density of short shoots (SS) of the tropical seagrass Thalassia testudinum and the physical-environmental forcing in the region. Seasonal sampling surveys were undertaken four times in Bahia de la Ascension, a shallow estuary in the western Mexican Caribbean, to measure plant morphology and environmental variables. The estuary has a fresh water-influenced inner bay, a large central basin and a marine zone featuring a barrier reef at the seaward margin...
2016: PloS One
Harald Hasler-Sheetal, Max C N Castorani, Ronnie N Glud, Don E Canfield, Marianne Holmer
Eutrophication of estuaries and coastal seas is accelerating, increasing light stress on subtidal marine plants and changing their interactions with other species. Such variations in environmental and biological stress might modify the impact of interactions among foundational species and eventually affect ecosystem health. To date there have been no empirical evaluations of the potential for environmental conditions to mediate the metabolic mechanisms underlying species interaction. Here we used metabolomics to assess the impact of light reductions on interactions between the seagrass Zostera marina, an important habitat-forming marine plant, and the abundant and commercially important blue mussel Mytilus edulis...
October 12, 2016: Environmental Science & Technology
A Ramzi, K Habeeb Rahman, T R Gireeshkumar, K K Balachandran, Chacko Jacob, N Chandramohanakumar
Polycyclic aromatic hydrocarbons (PAHs) showed significant seasonal dynamics in surface sediments of a tropical ecosystem (Cochin estuary, south west coast of India). Concentrations ranged from 304 to 5874ngg(-1) in pre-monsoon, 493 to 14,149ngg(-1) in monsoon, and 194 to 10,691ngg(-1) in post-monsoon. The estuary was moderately contaminated with low molecular weight PAH fractions, which increased rapidly during the monsoon season indicating land/river runoff as the major transport pathway. The dominance of 2-3 ring fractions in the PAH indicated petrogenic and low temperature combustion processes as major sources, while the very low levels of 5-6 ring components indicated low contribution from pyrolytic sources...
October 8, 2016: Marine Pollution Bulletin
Peter Vermeiren, Cynthia C Muñoz, Kou Ikejima
Micro- and macroplastic accumulation threatens estuaries worldwide because of the often dense human populations, diverse plastic inputs and high potential for plastic degradation and storage in these ecosystems. Nonetheless, our understanding of plastic sources and sinks remains limited. We designed conceptual models of the local and estuary-wide transport of plastics. We identify processes affecting the position of plastics in the water column; processes related to the mixing of fresh and salt water; and processes resulting from the influences of wind, topography, and organism-plastic interactions...
October 7, 2016: Marine Pollution Bulletin
Hongjun Li, Sheng Ye, Jinqing Ye, Jingfeng Fan, Meiling Gao, Hao Guo
A geographically extensive investigation was carried out to analyze the concentrations of heavy metals, PCBs and OCPs in the sediments and marine organisms collected from the Liaohe Estuary. In order to determine the spatial distribution and potential ecological risk of heavy metals, the surface sediments were collected from 44 sites in the Liaohe Estuary. The results showed that the heavy metal contents in the sediments were observed in the following order: Cr (11.2-84.8mg/kg)>Cu (1.7-47.9mg/kg)>Pb (4...
October 7, 2016: Marine Pollution Bulletin
Michael Alonzo, Jamon Van Den Hoek, Nabil Ahmed
The socio-ecological impacts of large scale resource extraction are frequently underreported in underdeveloped regions. The open-pit Grasberg mine in Papua, Indonesia, is one of the world's largest copper and gold extraction operations. Grasberg mine tailings are discharged into the lowland Ajkwa River deposition area (ADA) leading to forest inundation and degradation of water bodies critical to indigenous peoples. The extent of the changes and temporal linkages with mining activities are difficult to establish given restricted access to the region and persistent cloud cover...
October 11, 2016: Scientific Reports
Alyssa-Lois M Gehman, Jonathan H Grabowski, A Randall Hughes, David L Kimbro, Michael F Piehler, James E Byers
Not all hosts, communities or environments are equally hospitable for parasites. Direct and indirect interactions between parasites and their predators, competitors and the environment can influence variability in host exposure, susceptibility and subsequent infection, and these influences may vary across spatial scales. To determine the relative influences of abiotic, biotic and host characteristics on probability of infection across both local and estuary scales, we surveyed the oyster reef-dwelling mud crab Eurypanopeus depressus and its parasite Loxothylacus panopaei, an invasive castrating rhizocephalan, in a hierarchical design across >900 km of the southeastern USA...
October 8, 2016: Oecologia
Eduardo G Bento, Tiago F Grilo, Dániel Nyitrai, Marina Dolbeth, Miguel Ângelo Pardal, Filipe Martinho
Estuarine systems support the life cycle stages of commercially important marine fish and are influenced by large and local-scale climatic patterns. In this study, performed in the Mondego estuary, Portugal, we used an 11-year database (2003-2013) for analyzing the variability in the population of a marine juvenile migrant fish, the European sea bass Dicentrarchus labrax, regarding changes in abundance, population structure, growth rates, secondary production and annual day of peak abundance. Higher densities and production occurred in 2003, but no differences in 0-group growth could be observed...
September 28, 2016: Marine Environmental Research
Dagmara Wójcik-Fudalewska, Monika Normant-Saremba, Pedro Anastácio
The Chinese mitten crab is known as a pest causing damage to fishing gears and fish. On the other hand, this highly invasive species is considered a delicacy by Asian migrants and therefore commercially fished and sold in many countries. The ingestion of plastic by the Chinese mitten crab Eriocheir sinensis from the Baltic coastal waters (Poland) and the Tagus Estuary (Portugal) was studied based on stomach content analysis. As many as 13% of the 302 analysed males and females (38.07-89.07mm carapace width) from both regions, contained microplastic in the form of strands and balls...
October 4, 2016: Marine Pollution Bulletin
Pedro Freitas de Carvalho, Sérgio Luiz Costa Bonecker, Cristina Aparecida Gomes Nassar
This study aims to characterize the differences between physical and chemical parameters of water quality indicators and eutrophication in four estuaries of the state of Rio de Janeiro and relate them to full density of the species that belong to the Appendicularia class with the purpose of seeking bioindicators for estuarine areas. The estuaries studied were from the rivers Macaé, São João, Bracuí, and Perequê-Açu. The physicochemical parameters monitored for evaluation of the water bodies and used for the correlation with the appendicularians were pH, temperature, nitrite, nitrate, N-ammonia, total nitrogen, phosphate, total phosphorus, dissolved oxygen (DO), suspended particulate matter (SPM), chlorophyll a, heterotrophic bacteria, and fecal coliform...
November 2016: Environmental Monitoring and Assessment
Jessica A Lee, Christopher A Francis
Denitrifying bacteria play a critical role in the estuarine nitrogen cycle. Through the transformation of nitrate into nitrogen gas, these organisms contribute to the loss of bioavailable (i.e., fixed) nitrogen from low-oxygen environments such as estuary sediments. Denitrifiers have been shown to vary in abundance and diversity across the spatial environmental gradients that characterize estuaries, such as salinity and nitrogen availability; however, little is known about how their communities change in response to temporal changes in those environmental properties...
October 5, 2016: Microbial Ecology
Aviaja L Hauptmann, Thor N Markussen, Marek Stibal, Nikoline S Olsen, Bo Elberling, Jacob Bælum, Thomas Sicheritz-Pontén, Carsten S Jacobsen
Glacier melting and altered precipitation patterns influence Arctic freshwater and coastal ecosystems. Arctic rivers are central to Arctic water ecosystems by linking glacier meltwaters and precipitation with the ocean through transport of particulate matter and microorganisms. However, the impact of different water sources on the microbial communities in Arctic rivers and estuaries remains unknown. In this study we used 16S rRNA gene amplicon sequencing to assess a small river and its estuary on the Disko Island, West Greenland (69°N)...
2016: Frontiers in Microbiology
H C Tao, K Y Zhao, W Y Ding, J B Li, P Liang, S C Wu, M H Wong
In the present study, the Hg contamination in mariculture sites located at the estuary of Pearl River was to investigate with an attempt to analyse associated health risks of dietary exposure to both total mercury (THg) and methyl mercury (MeHg) in cultured fish and shellfish. The highest total mercury concentration (7.037 ± 0.556 ng L(-1)) of seawater was observed at Zhuhai Estuary. The Hg concentrations of sediment in Guishan Island were significantly higher (p < 0.05) than in Daya Bay (away from the Pearl River)...
October 1, 2016: Environmental Pollution
Pedro M Lourenço, José A Alves, Jeroen Reneerkens, Ah Jelle Loonstra, Peter M Potts, José P Granadeiro, Teresa Catry
Many migratory bird species show high levels of site fidelity to their wintering sites, which confers advantages due to prior knowledge, but may also limit the ability of the individual to move away from degrading sites or to detect alternative foraging opportunities. Winter site fidelity often varies among age groups, but sexual differences have seldom been recorded in birds. We studied a population of individually colour-marked sanderlings wintering in and around the Tejo estuary, a large estuarine wetland on the western coast of Portugal...
2016: PeerJ
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