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https://www.readbyqxmd.com/read/28528504/assessment-of-trace-metal-accumulation-in-native-mussels-brachidontes-rodriguezii-from-a-south-american-temperate-estuary
#1
Natalia Sol Buzzi, Ana Laura Oliva, Andrés Hugo Arias, Jorge Eduardo Marcovecchio
The present work provides the first results in heavy metal bioaccumulation in the autochthonous mussel Brachidontes rodriguezii from the Bahía Blanca Estuary (Argentina), one of the most important coastal environments of South America, subjected to different anthropogenic pressure. The study is based on the detection of Cd, Cu, Pb, Mn, and Fe in mussels' soft tissue and sediments' fine fraction by means of inductively coupled plasma atomic emission spectroscopy (ICP-OES), in order to analyze the potential relationship between both components of the aquatic system...
May 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28528414/tissue-contaminant-burdens-in-san-francisco-estuary-white-sturgeon-acipenser-transmontanus-implications-for-population-recovery
#2
Deke T Gundersen, Steven C Zeug, Robert B Bringolf, Joseph Merz, Zachary Jackson, Molly A H Webb
The San Francisco Estuary (SFE) is heavily influenced by anthropogenic activities, including historic and chronic contaminant inputs. These contaminants can adversely affect SFE fish populations, particularly white sturgeon, because they are a benthic dwelling, long-lived species. We measured a suite of metals and organic contaminants in liver and gonad tissues of 25 male and 32 female white sturgeon as well as several physiological indicators of sturgeon health. Most sturgeon (68% of males and 83% of females) were estimated to be between 13 and 17 years of age...
May 20, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28525787/metals-in-the-scheldt-estuary-from-environmental-concentrations-to-bioaccumulation
#3
Evy Van Ael, Ronny Blust, Lieven Bervoets
To investigate the relationship between metal concentrations in abiotic compartments and in aquatic species, sediment, suspended matter and several aquatic species (Polychaeta, Oligochaeta, four crustacean species, three mollusc species and eight fish species) were collected during three seasons at six locations along the Scheldt estuary (the Netherlands-Belgium) and analysed on their metal content (Ag, Cd, Co, Cr, Cu, Ni, Pb, Zn and the metalloid As). Sediment and biota tissue concentrations were significantly influenced by sampling location, but not by season...
May 16, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28518406/host-density-increases-parasite-recruitment-but-decreases-host-risk-in-a-snail-trematode-system
#4
J C Buck, R F Hechinger, A C Wood, T E Stewart, A M Kuris, K D Lafferty
Most species aggregate in local patches. High host density in patches increases contact rate between hosts and parasites, increasing parasite transmission success. At the same time, for environmentally-transmitted parasites, high host density can decrease infection risk to individual hosts, because infective stages are divided among all hosts in a patch, leading to safety in numbers. We tested these predictions using the California horn snail, Cerithideopsis californica (=Cerithidea californica), which is the first intermediate host for at least 19 digenean trematode species in California estuaries...
May 18, 2017: Ecology
https://www.readbyqxmd.com/read/28516405/characterization-of-dissolved-organic-matter-in-an-urbanized-estuary-located-in-northeastern-brazil
#5
Maria de Lara Palmeira de Macedo Arguelho, José do Patrocínio Hora Alves, Adnívia Santos Costa Monteiro, Carlos Alexandre Borges Garcia
The Sal River estuary, which is located in the state of Sergipe, Northeastern Brazil, stands out as an urban estuary, anthropogenically impacted by untreated and treated wastewater discharge. Synchronous fluorescence spectroscopy and measurement of dissolved organic carbon (DOC) were used for characterization of dissolved organic matter (DOM) in the estuarine water. Dissolved organic carbon concentrations ranged from 7.5 to 19.0 mg L(-1) and, in general, the highest values were recorded during dry season...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28511940/comparative-efficacy-of-benthic-biotic-indices-in-assessing-the-ecological-quality-status-ecoqs-of-the-stressed-ulhas-estuary-india
#6
Jyoti Mulik, Soniya Sukumaran, Tatiparthi Srinivas, Tejal Vijapure
Ecostatus of Ulhas estuary, one of the most polluted estuaries along the industrialized and urbanized northwest coast of India, was evaluated by six widely accepted benthic indices viz. H'(log2), AMBI, M-AMBI, BENTIX, BOPA and BO2A to test their efficiency in a tropical setting. The mesohaline zone, which presented eutrophic conditions, was classified as 'bad' by all indices due to the azoic status. Despite significant correlations obtained between indices, there were discrepancies in the accurate level of EcoQS assigned to each station...
May 13, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28502627/distribution-of-pbdes-hbcds-and-pcbs-in-the-brisbane-river-estuary-sediment
#7
Alfred K Anim, Daniel S Drage, Ashantha Goonetilleke, Jochen F Mueller, Godwin A Ayoko
To date, very little or no data exist in literature for some brominated flame retardants (BFRs) and polychlorinated biphenyls in Queensland sediments. These pollutants were measured in the sediments along the Brisbane River estuary. The target compounds were regularly detected in measurable concentrations: PBDEs=33.3-97.8% (n=45), PCBs=94.1-100% (n=51) and HBCDs=79-98% (n=48). Consistently, >90% of the observed ∑8PBDE concentration was attributed to BDE-209. Mean PBDE levels (ng/g dry wt.) were: 4.4±3...
May 11, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28501963/salinity-driven-decadal-changes-in-phytoplankton-community-in-the-nw-arabian-gulf-of-kuwait
#8
Turki Al-Said, Aws Al-Ghunaim, D V Subba Rao, Faiza Al-Yamani, Kholood Al-Rifaie, Ali Al-Baz
Evaluation of hydrological data obtained between 2000 and 2013 from a time series station in Kuwait Bay (station K6) and an offshore southern location (station 18) off Kuwait showed drastic increase in salinity by 6 units. We tested the hypothesis that increased salinity impacted phytoplankton community characteristics in these semiarid waters. The Arabian Gulf receives seasonal freshwater discharge in the north via Shatt Al-Arab estuary with a peak during March-July. A north to south gradient in the proportion of the freshwater exists between station A in the vicinity of Shatt Al-Arab estuary and station 18 in the southern offshore area...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28499928/detection-of-ostreid-herpesvirus-1-microvariants-in-healthy-crassostrea-gigas-following-disease-events-and-their-possible-role-as-reservoirs-of-infection
#9
Olivia Evans, Paul Hick, Richard J Whittington
Ostreid herpesvirus-1 microvariants (OsHV-1) cause severe mortalities in farmed Crassostrea gigas in Europe, New Zealand and Australia. Outbreaks are seasonal, recurring in the warmer months of the year in endemic estuaries. The reference genotype and microvariant genotypes of OsHV-1 have been previously detected in the tissues of apparently healthy adult oysters naturally exposed to OsHV-1 in the field. However, the role of such oysters as reservoirs of infection for subsequent mortality outbreaks remains unclear...
May 9, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28499584/extremely-high-sulfate-reduction-sediment-oxygen-demand-and-benthic-nutrient-flux-associated-with-a-large-scale-artificial-dyke-and-its-implication-to-benthic-pelagic-coupling-in-the-yeongsan-river-estuary-yellow-sea
#10
Sung-Han Kim, Jae Seong Lee, Jung-Ho Hyun
We investigated environmental impact of large-scale dyke on the sediment geochemistry, sulfate reduction rates (SRRs), sediment oxygen demand (SOD) and potential contribution of benthic nutrient flux (BNF) to primary production in the Yeongsan River estuary, Yellow Sea. The sediment near the dyke (YE1) with high organic carbon (Corg) content (>4%, dry wt.) was characterized by extremely high SOD (327mmolm(-2)d(-1)) and SRRs (91-140mmolm(-2)d(-1)). The sulfate reduction accounted for 73% of Corg oxidation, and was responsible for strikingly high concentrations of NH4(+) (7...
May 9, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28499249/estimates-of-potential-childhood-lead-exposure-from-contaminated-soil-using-the-us-epa-ieubk-model-in-sydney-australia
#11
Mark A S Laidlaw, Shaike M Mohmmad, Brian L Gulson, Mark P Taylor, Louise J Kristensen, Gavin Birch
Surface soils in portions of the Sydney (New South Wales, Australia) urban area are contaminated with lead (Pb) primarily from past use of Pb in gasoline, the deterioration of exterior lead-based paints, and industrial activities. Surface soil samples (n=341) were collected from a depth of 0-2.5cm at a density of approximately one sample per square kilometre within the Sydney estuary catchment and analysed for lead. The bioaccessibility of soil Pb was analysed in 18 samples. The blood lead level (BLL) of a hypothetical 24 month old child was predicted at soil sampling sites in residential and open land use using the United States Environmental Protection Agency (US EPA) Integrated Exposure Uptake and Biokinetic (IEUBK) model...
May 9, 2017: Environmental Research
https://www.readbyqxmd.com/read/28492174/hematodinium-spp-infections-in-wild-and-cultured-populations-of-marine-crustaceans-along-the-coast-of-china
#12
Jin-Feng Wang, Meng Li, Jie Xiao, Wen-Jun Xu, Cai-Wen Li
The parasitic dinoflagellate Hematodinium spp. infects a broad range of marine crustaceans. Its epidemics have impacted wild populations of various commercial fishery species around the world and the sustainability of mariculture in China. To study the epidemiology of Hematodinium spp. in marine crustaceans along the coast of China, we conducted a broad survey of wild and cultured stocks of major crustacean species in 2013 to 2015. Hematodinium sp. infections were identified in wild stocks of Portunus trituberculatus from Huludao, Laizhou, Qingdao, Yangtze River Estuary and Zhoushan, and Scylla paramamosain from Shantou; and cultured stocks of Portunus trituberculatus and Penaeus monodon from a polyculture pond in Qingdao...
May 11, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28492173/disease-ecology-of-hematodinium-perezi-in-a-high-salinity-estuary-investigating-seasonal-trends-in-environmental-detection
#13
K A Lycett, J S Pitula
The blue crab Callinectes sapidus has seen a general decline in population levels. One factor influencing mortality is infections by Hematodinium perezi, a dinoflagellate parasite. A 2 yr study was conducted in 2014 and 2015 to monitor H. perezi DNA within the Maryland (USA) coastal bays, comparing seasonal cycles in the abundance of parasite DNA in environmental samples to parasite presence in host blue crabs. A late summer to early fall peak in H. perezi infections in blue crabs was observed, consistent with previous work...
May 11, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28489191/pathogenic-vibrio-species-isolated-from-estuarine-environments-cear%C3%A3-brazil-antimicrobial-resistance-and-virulence-potential-profiles
#14
Francisca G R DE Menezes, Marina T T Rodriguez, Fátima C T DE Carvalho, Rosa H Rebouças, Renata A Costa, Oscarina V DE Sousa, Ernesto Hofer, Regine H S F Vieira
Detection of virulent strains associated with aquatic environment is a current concern for the management and control of human and animal health. Thus, Vibrio diversity was investigated in four estuaries from state of Ceará (Pacoti, Choró, Pirangi and Jaguaribe) followed by antimicrobial susceptibility to different antimicrobials used in aquaculture and detection of main virulence factors to human health. Isolation and identification were performed on TCBS agar (selective medium) and dichotomous key based on biochemical characteristics, respectively...
April 27, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28488226/the-prevalence-of-antibiotic-resistant-bacteria-arb-in-waters-of-the-lower-ballona-creek-watershed-los-angeles-county-california
#15
Stephanie Kawecki, Gary Kuleck, John H Dorsey, Christopher Leary, Michelle Lum
Screening for the prevalence of antibiotic-resistant bacteria (ARB) was done at the Ballona Creek and Wetlands, an urban-impacted wetland system in Los Angeles, California. The goals were (1) to assess the overall prevalence of ARB, and (2) compare differences in ARB abundance and the types of antibiotic resistance (AR) among the following sample types: lagoon water from Del Rey Lagoon, urban runoff from Ballona Creek, and water from the Ballona Wetlands (tidal water flooding in from the adjacent estuary, and ebbing out from the salt marsh)...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28483142/hydrogeochemical-and-isotopic-signature-of-surface-and-groundwater-in-a-highly-industrialized-sector-of-the-rio-de-la-plata-coastal-plain-argentina
#16
L Santucci, E Carol, G Borzi, M G García
The coastal plain of the middle estuary of the Río de la Plata is a highly industrialized area and is densely populated by sectors. The main human activity in the sector encompassed between the cities of Ensenada and Berisso is associated with the petrochemical industry. In this work, hydrogeochemical and isotopic characteristics of surface and groundwater in the impacted area are analyzed and the results are contrasted with those obtained in an undisturbed protected area. Major and trace elements were determined using standardized methods while the stable isotopes δ(18)O y δ(2)H were analyzed by mass spectroscopy...
May 5, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28475951/characterization-of-cadmium-transport-in-hepatopancreatic-cells-of-a-mangrove-crab-ucides-cordatus-the-role-of-calcium
#17
Priscila Ortega, Marcio R Custódio, Flavia P Zanotto
Cadmium is a toxic metal, present in batteries and discarded in estuaries and mangrove habitats. Apart from that, it is a non-essential metal that causes toxic effects in many organisms. Cadmium accumulates in gills and hepatopancreas of crustaceans and its route into the cell is unknown. It is possible that occurs by calcium channels or calcium transporters. The objective of this study was to characterize the transport of cadmium and the role of calcium in different cell types from hepatopancreas of the mangrove crab Ucides cordatus...
April 19, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28474480/differential-responses-of-marine-mesohaline-and-oligohaline-bacterial-communities-to-the-addition-of-terrigenous-carbon
#18
Dpr Herlemann, M Manecki, T Dittmar, K Jürgens
In response to global warming, increasing quantities of tDOM are transported through estuaries from land to the sea. In this study we investigated microbial responses to increased tDOM concentrations in three salinity regimes (salinity: 32, 7 and 3) characteristic of the Baltic Sea. Mesocosm experiments performed in May and November revealed low (0-6%) dissolved organic carbon (DOC) utilization. Molecular DOM analyses using ultra-high-resolution mass spectrometry identified the terrigenous signal in the tDOM manipulation, but the molecular changes in DOM levels over the course of the experiment were subtle...
May 4, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28474400/first-record-of-pughead-deformity-in-cichla-kelberi-teleostei-cichlidae-an-invasive-species-in-an-estuarine-system-in-south-eastern-brazil
#19
P A Catelani, A B Bauer, F Di Dario, F M Pelicice, A C Petry
The first record of pughead deformity in a Neotropical freshwater fish not raised in captivity is provided, based on an adult male of Cichla kelberi introduced into an estuary of Rio de Janeiro State, south-eastern Brazil. A general biological characterization of the specimen is provided and aspects of its aberrant anatomy are described. Environmental and biological factors that may cause pughead deformity in fishes are discussed.
May 4, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28473172/functional-diversity-of-zooplankton-communities-in-two-tropical-estuaries-ne-brazil-with-different-degrees-of-human-induced-disturbance
#20
Helena Veríssimo, Joana Patrício, Érica Gonçalves, Gustavo C Moura, José Etham L Barbosa, Ana M M Gonçalves
This study assessed the functional diversity (FD) of copepod communities along the environmental gradient of two tropical estuaries with different intensities of human impact - the environmentally protected "Mamanguape" and the urbanised "Paraiba". Different trait-based approaches were used: functional groups identification and description, and FD indices estimation. The results showed similar functional groups and functional indices between the two estuaries with some variability attributed to seasonality...
April 13, 2017: Marine Environmental Research
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