Reichelt R.,Manitoba Conservation and Water Stewardship
Geoscience Canada | Year: 2014
Professional geoscientists, including those practicing environmental geo-science, have definite and definable legal and ethical responsibilities. These obligations apply to environmental geoscientists working as consultants, academics, regulators or environmental managers. Environmental geoscientists are obliged to be aware of and obey all federal, provincial and municipal laws and regulations applying to professional geoscientists. As well as the provincial engineering and geoscience acts, a variety of additional guidelines and professional standards apply to the professional geoscientist. These include criminal, labour, and business law as well as environmental acts and regulations. Governments, professional associations and private standards agencies, such as the Canadian Standards Association and the American Society for Testing and Materials, have also issued relevant guidelines and standards. © 2014 GAC/AGC®
Legault J.M.,Geotech Ltd. |
Toop D.,Manitoba Conservation and Water Stewardship |
Oldenborger G.A.,Geological Survey of Canada |
Plastow G.,Geotech Ltd. |
And 3 more authors.
28th Symposium on the Application of Geophysics to Engineering and Environmental Problems 2015, SAGEEP 2015 | Year: 2015
VTEM helicopter time-domain EM survey results over the Brandon Channel and Assiniboine Delta aquifers, near Brandon, Manitoba, have been studied using unconstrained layered earth modeling. The resistive sand and gravel layers are distinguished from the more conductive shale basement and reveal localized thickening from blind gravel channels cut into its floor. They further distinguish a lower aquifer separated by a conductive clay layer from shallow sands of the Assiniboine Alluvial aquifer and the Assiniboine Delta Aquifer. The Brandon Channel aquifer is delineated, to the northwest and east of the city where it splits into a main south channel and smaller north channel. The western extent of Assiniboine Alluvial aquifer is defined and evidence for the Pierson Valley aquifer extending west from Brandon is also indicated.
Clouthier S.C.,University of Winnipeg |
Vanwalleghem E.,University of Winnipeg |
Vanwalleghem E.,University of Manitoba |
Copeland S.,University of Winnipeg |
And 4 more authors.
Diseases of Aquatic Organisms | Year: 2013
A newly discovered virus, Namao virus, associated with morbidity and mortality, was detected among juvenile lake sturgeon Acipenser fulvescens being propagated by a conservation stocking program for this endangered species in Manitoba, Canada. The outbreaks resulted in cumulative mortalities of 62 to 99.6% among progeny of wild Winnipeg River or Nelson River lake sturgeon and occurred at 2 geographically separate facilities. Namao virus was detected in almost 94% of the moribund or dead lake sturgeon according to a conventional polymerase chain reaction (cPCR) test that is based upon amplification of a 219 bp fragment of the virus major capsid protein (MCP). The virus itself was large (242 to 282 nm) and icosahedral-shaped with 2 capsids and a condensed bar-shaped core. It was found in virus factories within the host cell cytoplasm and displayed a tropism for the integument. Namao virus caused cellular changes characterized by enlarged eosinophilic epithelial cells in the gills and skin. Samples suspected of containing Namao virus did not have cytopathic effects on primary lake sturgeon or established white sturgeon cell lines. However, viral nucleic acid was detected in the former after prolonged incubation periods. Using primers designed from conserved regions of the MCP from NCLDVs, an estimated 95 to 96% of the Namao virus MCP open reading frame was captured. Phylogenetic analysis using the MCP of Namao virus and 27 other NCLDVs suggested that Namao virus and white sturgeon iridovirus share a common evolutionary past and might be members of the family Mimiviridae or a new, as yet unrecognized, virus family. © Inter-Research and Fisheries and Oceans Canada 2013.
Beshada E.,Manitoba Conservation and Water Stewardship |
Zhang Q.,University of Manitoba |
Boris R.,Manitoba Hydro
Canadian Biosystems Engineering / Le Genie des biosystems au Canada | Year: 2014
An experimental study was conducted to compare two localized heating methods, namely heat pads and heat lamps, in a commercial swine farrowing facility. Two farrowing rooms each with 44 crates were instrumented for monitoring room environmental conditions (temperature and relative humidity) and energy consumption. One room was equipped with 175W (per crate) heat lamps and the other room with 65W (per crate) heat pads. The piglet mortality and weight gain were recorded. The air temperature in the two rooms was maintained at the same level using environmental controllers (set at the same setpoint). However, the relative humidity in the lamp room was found to be lower than that in the heat pad room probably due to more ventilation required to remove more sensible heat produced by the lamps. There were no significant differences in the mortality rate and weight gain between heat pads and heat lamps. The daily energy consumption by heat pads was 2.9 kWh less than that by heat lamps per crate. This represents a 73% saving of energy required for localized heating.
Donald D.B.,Environment Canada |
Parker B.R.,Manitoba Conservation and Water Stewardship |
Davies J.-M.,Saskatchewan Water Security Agency and 101 |
Leavitt P.R.,University of Regina
Journal of Great Lakes Research | Year: 2015
Lake Winnipeg, Manitoba, has been subjected to significant increases in nutrient loading over the last few decades, and consequently has experienced significant and widespread algal blooms. The objective of our study was to identify sources of nutrients in the Lake Winnipeg basin, and quantify their removal (sequestration) into 28 of the largest lakes and reservoirs located in the Saskatchewan, Dauphin, Red, and Winnipeg river sub-basins, thus preventing their transport downstream to Lake Winnipeg. Discharges were determined daily, and nutrient parameter concentrations determined once or twice each month upstream and downstream from each of the lakes and reservoirs for three years. Concentrations of P and N in source waters of the Lake Winnipeg basin varied substantially, with the lowest concentrations occurring in pristine headwaters of the Saskatchewan River (mean TP. =. 14. μg/L; mean TN. =. 217. μg/L) and some of the highest concentrations occurring in small streams that originated within agricultural landscapes in the headwaters of the Dauphin River sub-basin (mean TP. =. 133. μg/L; mean TN. =. 1313. μg/L). Twelve reservoirs in the Saskatchewan River sub-basin collectively sequestered 92% of the TP inputs and 68% of the TN inputs to the sub-basin. In P-rich lakes, relatively more N was sequestered than P compared with nutrient impoverished lakes. A total 13,215. t/yr TP was discharged into Lake Winnipeg while 8234. t. TP/yr, was sequestered into the lakes and reservoirs. The Red River sub-basin was the principal source of nutrients to Lake Winnipeg and should be the focus of nutrient management in the Lake Winnipeg basin. © 2015 International Association for Great Lakes Research..