Vertical distribution of the chloromonad flagellate Heterosigma carterae in columns: implications for bloom development

1997 ◽  
Vol 54 (10) ◽  
pp. 2228-2234 ◽  
Author(s):  
P K Hershberger ◽  
J E Rensel ◽  
A L Matter ◽  
F B Taub
Keyword(s):  
Surface Waters ◽  
Cell Concentration ◽  
Environmental Data ◽  
Vertical Stratification ◽  
Fish Kills ◽  
The World ◽  
Sudden Appearance ◽  
Mitigation Techniques ◽  
Heterosigma Carterae ◽  
Subsequent Disappearance

Blooms of the marine flagellate Heterosigma carterae have been associated with catastrophic fish kills at mariculture facilities around the world. The precise cause(s) of the sudden appearance and disappearance of Heterosigma surface blooms has not been completely described or understood. Environmental data from prior studies of blooms indicate the presence of vertical stratification of the water column that is often induced by freshwater runoff. We report the relatively rapid concentration of Heterosigma cells at the surface of tubes shortly after the addition of distilled water to the surface. This phenomenon of cell concentration in surface waters may partially explain the sudden appearance of Heterosigma cells near the surface and subsequent disappearance when vertical stratification is lost due to turbulence or mixing. The results may lead to bloom mitigation techniques for net pen aquaculture.

scholarly journals Sources and Species of Cryptosporidium Oocysts in the Wachusett Reservoir Watershed

2002 ◽  
Vol 68 (2) ◽  
pp. 569-575 ◽  
Author(s):  
Kristen L. Jellison ◽  
Harold F. Hemond ◽  
David B. Schauer
Keyword(s):  
Public Health ◽  
Surface Waters ◽  
Management Practices ◽  
Immunofluorescence Microscopy ◽  
Cold Water ◽  
Environmental Data ◽  
The Public ◽  
Specificity And Sensitivity ◽  
Cryptosporidium Oocysts ◽  
Reservoir Watershed

ABSTRACT Understanding the behavior of Cryptosporidium oocysts in the environment is critical to developing improved watershed management practices for protection of the public from waterborne cryptosporidiosis. Analytical methods of improved specificity and sensitivity are essential to this task. We developed a nested PCR-restriction fragment length polymorphism assay that allows detection of a single oocyst in environmental samples and differentiates the human pathogen Cryptosporidium parvum from other Cryptosporidium species. We tested our method on surface water and animal fecal samples from the Wachusett Reservoir watershed in central Massachusetts. We also directly compared results from our method with those from the immunofluorescence microscopy assay recommended in the Information Collection Rule. Our results suggest that immunofluorescence microscopy may not be a reliable indicator of public health risk for waterborne cryptosporidiosis. Molecular and environmental data identify both wildlife and dairy farms as sources of oocysts in the watershed, implicate times of cold water temperatures as high-risk periods for oocyst contamination of surface waters, and suggest that not all oocysts in the environment pose a threat to public health.

Advanced treatment for impaired water supplies: when advanced oxidation systems are the best option

2011 ◽  
Vol 6 (4) ◽  
Author(s):  
J. Collins ◽  
C. Cotton ◽  
M. MacPhee
Keyword(s):  
Surface Waters ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Advanced Treatment ◽  
Water Supplies ◽  
Oxidation Processes ◽  
Sustainable Water Supply ◽  
The World ◽  
Quenching Method ◽  
Impaired Water

As drought becomes pervasive around the world, many water suppliers are turning to water supplies once avoided – contaminated surface waters and groundwaters and wastewater. These water supplies are now a valuable part of a sustainable water supply; however, advanced treatment with advanced oxidation processes (AOPs) is typically needed to address trace contaminants in these supplies. This paper will address the following questions: 1) What is the best AOP technology for a given application? 2) Are there oxidation byproducts of concern? 3) What is the best peroxide quenching method? 4) How cost competitive are AOPs?

The World at One's Fingertips: Interactive Interpretation of Environmental Data

2013 ◽  
pp. 395-416
Author(s):  
Jon Blower ◽  
Keith Haines ◽  
Alastair Gemmell
Keyword(s):  
Environmental Data ◽  
The World

scholarly journals Diversity and distribution of Nitrogen Fixation Genes in the Oxygen Minimum Zones of the World Oceans

2020 ◽  
Author(s):  
Amal Jayakumar ◽  
Bess B. Ward
Keyword(s):  
Nitrogen Fixation ◽  
Surface Waters ◽  
World Ocean ◽  
Operational Taxonomic Unit ◽  
N Fixation ◽  
Oxygen Minimum Zones ◽  
Abundant Otus ◽  
The World ◽  
Nifh Genes ◽  
Oxygen Minimum

Abstract. Diversity and community composition of nitrogen fixing microbes in the three main oxygen minimum zones (OMZs) of the world ocean were investigated using operational taxonomic unit (OTU) analysis of nifH clone libraries. Representatives of the all four main clusters of nifH genes were detected. Cluster I sequences were most diverse in the surface waters and the most abundant OTUs were affiliated with Alpha- and Gammaproteobacteria. Cluster II, III, IV assemblages were most diverse at oxygen depleted depths and none of the sequences were closely related to sequences from cultivated organisms. The OTUs were biogeographically distinct for the most part – there was little overlap among regions, between depths or between cDNA and DNA. Only a few cyanobacterial sequences were detected. The prevalence and diversity of microbes that harbour nifH genes in the OMZ regions, where low rates of N fixation are reported, remains an enigma.

scholarly journals Development of a Java-based application for environmental remote sensing data processing

2019 ◽  
Vol 9 (3) ◽  
pp. 1978 ◽  
Author(s):  
Bad-reddine Boudriki Semlali ◽  
Chaker El Amrani ◽  
Siegfried Denys
Keyword(s):  
Remote Sensing ◽  
Air Pollution ◽  
Data Processing ◽  
Real Time ◽  
Remote Sensing Data ◽  
Environmental Data ◽  
Decision Makers ◽  
Application Software ◽  
The World ◽  
Time Map

Air pollution is one of the most serious problems the world faces today. It is highly necessary to monitor pollutants in real-time to anticipate and reduce damages caused in several fields of activities. Likewise, it is necessary to provide decision makers with useful and updated environmental data. As a solution to a part of the above-mentioned necessities, we developed a Java-based application software to collect, process and visualize several environmental and pollution data, acquired from the Mediterranean Dialog earth Observatory (MDEO) platform [1]. This application will amass data of Morocco area from EUMETSAT satellites, and will decompress, filter and classify the received datasets. Then we will use the processed data to build an interactive environmental real-time map of Morocco. This should help finding out potential correlations between pollutants and emitting sources.

scholarly journals Satellite-based climate information within the WMO RA VI Regional Climate Centre on Climate Monitoring

2014 ◽  
Vol 11 (1) ◽  
pp. 25-33 ◽  
Author(s):  
A. Obregón ◽  
H. Nitsche ◽  
M. Körber ◽  
A. Kreis ◽  
P. Bissolli ◽  
...  
Keyword(s):  
Regional Climate ◽  
Regional Scale ◽  
European Space Agency ◽  
Environmental Data ◽  
Product Portfolio ◽  
Climate Information ◽  
Climate Data ◽  
Climate Services ◽  
Climate Monitoring ◽  
The World

Abstract. The World Meteorological Organization (WMO) established Regional Climate Centres (RCCs) around the world to create science-based climate information on a regional scale within the Global Framework for Climate Services (GFCS). The paper introduces the satellite component of the WMO Regional Climate Centre on Climate Monitoring (RCC-CM) for Europe and the Middle East. The RCC-CM product portfolio is based on essential climate variables (ECVs) as defined by the Global Climate Observing System (GCOS), spanning the atmospheric (radiation, clouds, water vapour) and terrestrial domains (snow cover, soil moisture). In the first part, the input data sets are briefly described, which are provided by the EUMETSAT (European Organisation for the Exploitation of Meteorological Satellites) Satellite Application Facilities (SAF), in particular CM SAF, and by the ESA (European Space Agency) Climate Change Initiative (CCI). In the second part, the derived RCC-CM products are presented, which are divided into two groups: (i) operational monitoring products (e.g. monthly means and anomalies) based on near-real-time environmental data records (EDRs) and (ii) climate information records (e.g. climatologies, time series, trend maps) based on long-term thematic climate data records (TCDRs) with adequate stability, accuracy and homogeneity. The products are provided as maps, statistical plots and gridded data, which are made available through the RCC-CM website (www.dwd.de/rcc-cm).

scholarly journals Microflora of the selected water reservoirs in Swietokrzyskie Voivodship.

1970 ◽  
Vol 60 (4) ◽  
Author(s):  
Wioletta Adamus-Bialek ◽  
Karolina Karwacka ◽  
Lukasz Bak
Keyword(s):  
Surface Waters ◽  
Environmental Issues ◽  
Inland Waters ◽  
Water Reservoirs ◽  
Sanitary Condition ◽  
Water And Sediment ◽  
The World ◽  
Epidemiological Risk ◽  
High Concentrations

One of the important environmental issues is the quality of surface waters in the world. Poland belongs to countries with a low quality of the inland waters. The sanitary condition of the five water reservoirs of south-east Poland was analyzed. Water and sediment samples were incubated on the selective and/or differential media. High concentrations of many common and pathogenic microbial indicators were shown in those samples. Those reservoirs are used by people, especially during summer. Because of the high epidemiological risk, detailed analysis of all inland waters should be performed routinely.

scholarly journals CartograTree: Enabling Landscape Genomics for Forest Trees

2016 ◽  
Author(s):  
Nic Herndon ◽  
Emily S Grau ◽  
Iman Batra ◽  
Steven A Demurjian Jr. ◽  
Hans A Vasquez-Gross ◽  
...  
Keyword(s):  
Population Structure ◽  
Economic Value ◽  
Genomic Data ◽  
Environmental Data ◽  
Geospatial Data ◽  
Data Sets ◽  
Forest Trees ◽  
Analytic Framework ◽  
Landscape Genomics ◽  
The World

Forest trees cover just over 30% of the earth's surface and are studied by researchers around the world for both their conservation and economic value. With the onset of high throughput technologies, tremendous phenotypic and genomic data sets have been generated for hundreds of species. These long-lived and immobile individuals serve as ideal models to assess population structure and adaptation to environment. Despite the availability of comprehensive data, researchers are challenged to integrate genotype, phenotype, and environment in one place. Towards this goal, CartograTree was designed and implemented as a repository and analytic framework for genomic, phenotypic, and environmental data for forest trees. One of key components, the integration of geospatial data, allows the display of environmental layers and acquisition of environmental metrics relative to the positions of georeferenced individuals.

scholarly journals CartograTree: Enabling landscape genomics for forest trees

2016 ◽  
Author(s):  
Nic Herndon ◽  
Emily S Grau ◽  
Iman Batra ◽  
Steven A Demurjian Jr. ◽  
Hans A Vasquez-Gross ◽  
...  
Keyword(s):  
Economic Value ◽  
Environmental Data ◽  
Geospatial Data ◽  
Data Sets ◽  
Forest Trees ◽  
Analytic Framework ◽  
Landscape Genomics ◽  
Data Limitations ◽  
New Development ◽  
The World

Forest trees cover just over 30% of the earth's surface and are studied by researchers around the world for both their conservation and economic value. With the onset of high throughput technologies, tremendous phenotypic and genomic data sets have been generated for hundreds of species. These long-lived and immobile individuals serve as ideal models to assess population structure and adaptation to environment. Despite the availability of comprehensive data, researchers are challenged to integrate genotype, phenotype, and environment in one place. Towards this goal, CartograTree was designed and implemented as an open repository and open-source analytic framework for genomic, phenotypic, and environmental data for forest trees. One of its key components, the integration of geospatial data, allows the display of environmental layers and acquisition of environmental metrics relative to the positions of georeferenced individuals. Currently, CartograTree uses the Google Maps API to load environmental data. Limitations inherent to this API are driving new development with a focus on functionality to provide efficient queries of numerous environmental metrics.

scholarly journals CartograTree: Enabling landscape genomics for forest trees

2016 ◽  
Author(s):  
Nic Herndon ◽  
Emily S Grau ◽  
Iman Batra ◽  
Steven A Demurjian Jr. ◽  
Hans A Vasquez-Gross ◽  
...  
Keyword(s):  
Economic Value ◽  
Environmental Data ◽  
Geospatial Data ◽  
Data Sets ◽  
Forest Trees ◽  
Analytic Framework ◽  
Landscape Genomics ◽  
Data Limitations ◽  
New Development ◽  
The World

Forest trees cover just over 30% of the earth's surface and are studied by researchers around the world for both their conservation and economic value. With the onset of high throughput technologies, tremendous phenotypic and genomic data sets have been generated for hundreds of species. These long-lived and immobile individuals serve as ideal models to assess population structure and adaptation to environment. Despite the availability of comprehensive data, researchers are challenged to integrate genotype, phenotype, and environment in one place. Towards this goal, CartograTree was designed and implemented as an open repository and open-source analytic framework for genomic, phenotypic, and environmental data for forest trees. One of its key components, the integration of geospatial data, allows the display of environmental layers and acquisition of environmental metrics relative to the positions of georeferenced individuals. Currently, CartograTree uses the Google Maps API to load environmental data. Limitations inherent to this API are driving new development with a focus on functionality to provide efficient queries of numerous environmental metrics.

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