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Wednesday, 09 July 2008 |
HTML clipboard The team "organic contaminants" has a long experience in the study of organic contaminants from the environment, particularly in the field of studying biogeochemical cycles of organic contaminants and in the study toxicological their environmental impact. His research activity is focused on the one hand on methodological developments for the analysis of chemical pollutants into the environment (ultra-traces developments, multi-residue complex matrices). On the other hand, the team is studying the phenomena biotic (bioaccumulation, metabolic activation, biodegradation) and abiotic (photo-oxidation, sedimentation, chemical and thermal oxidation ...) which determine the presence and fate of organic chemical contaminants in the environment. It is also studying the mechanisms, which determine the toxicity of contaminants and has developed many research in the field of study transfer to other organizations, bioaccumulation, biotransformation of chemical pollutants including PAH and links between exposure and toxic effects.
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Wednesday, 09 July 2008 |
HTML clipboard Canadians have a right to enjoy clean air, clean water and a clean environment. However, there are toxic substances represent a potential risk to human health that are often either necessary or inevitable by-products of industry, transport, waste disposal, etc.. A strict approach to care and prevention is needed for monitoring, evaluation and development of control measures if it wants to avoid these substances into the environment reach levels that could have effects harmful to health.
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Wednesday, 09 July 2008 |
HTML clipboard Number of industrial activities may affect the fish and its habitat, including exploitation of oil and gas, mining, chemical industries, maritime transport and electricity generation. In order to support and to wisely manage these activities to ensure they have a minimal impact on ecosystems, policy decisions and regulations fair and informed must be taken. Hence, the Directorate of Environmental Sciences DFO focus its scientific expertise on the environmental impacts that must be taken into account in decision-making.
Hydroelectricity industrial activities
It is expected that the production of hydroelectricity in Canada continues to increase during the next decade. But hydroelectric dams can profoundly disrupt the flow of rivers dammed. The change in flow regimes and the creation of reservoirs restraint unfortunately affect the migration and survival of fish, and the food chains on which they depend.
Hydroelectricity
 Research results on the flows necessary for the survival of fish used to improve the design of hydroelectric facilities and operating practices, consistent with the goals of conservation and protection of the Fisheries Act. We also are conducting research on the effects of creating reservoirs restraint on the availability of mercury, because the resulting floods may lead to high levels of this heavy metal in water and fish.
The Exploits River, Newfoundland, which has one of the biggest ski of Atlantic salmon in North America, is an example of successful scientific management of fisheries. Two large hydroelectric dams and several Pulp and paper along its course. For several decades, the MPO has conducted research on the environmental impacts of these facilities in order to increase production to salmon in the basin.
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Wednesday, 09 July 2008 |
The coastal and estuarine sediments contain many substances, some of which are toxic said: heavy metals, polyaromatic hydrocarbons, organochlorines (PCBs), pesticides and biocides divers. Their dredging and dumping at sea poses the problem of mobility elements and toxic substances and their effects on living organisms. The process involved in the detention or release of contaminants associated with sediment are regulated to a large extent by the physical and chemical properties of the environment of the site of deposit, but also linked to microbiological activity in the sediment dredged. Particular attention is given to toxic contaminants, persistent and bioaccumulative.
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Last Updated ( Wednesday, 09 July 2008 )
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Wednesday, 09 July 2008 |
HTML clipboard The concentration of human populations along rivers and coastlines, industrial pollution and domestic rivers, intensive agriculture, leaching of soil and transfer of pollutants into the oceans via rivers are all factors involved in the contamination of coastal marine ecosystems, in particular by persistent toxic substances (PTS) and qualified because of their resistance to degradation and their potential toxic to the fauna and flora. The marine mammals at the top of the food chain accumulate very large quantities of these substances whose effects on these animals is poorly understood. Despite the attention and protection measures which it is subject, the population of beluga whales of the St. Lawrence does not seem to recover and the deterioration of its environment, including the presence of contaminants, is one of the reasons cited to explain this situation.
On the other hand, other species of marine mammals who share the same environment are also the contamination.
As top predators of the food chain, beluga whales and pinnipeds exert significant control over the balance of their ecosystem.
However, the study of toxic effects of contaminants on these species is facing logistical and ethical, and therefore requires an integrated and interdisciplinary approach. |
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Toxic Contaminants 
