Environmental Science:
Science Information By:
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Habitat Science
Hydro Electricity | Oil & Gas
| Toxic Contaminants
A number of human industrial activities can affect fish and their
habitat. These include oil & gas development, mining, chemical industries,
shipping and electricity generation. In order to sustain and soundly manage
these activities to ensure minimum impact on ecosystems, accurate and
informed regulatory and policy decisions must be made. As a result,
Environmental Science at DFO is issue driven; focusing our scientific
expertise on the environmental effects that must be factored in to all
decision-making.
Hydro Electricity
Hydroelectric generation in Canada is expected to continue to increase over
the next decade. Hydroelectric dams can significantly alter the flow regime
of rivers. Unfortunately changing flow regimes and impoundments affect fish
migration and survival, along with the food webs upon which they depend.
Research on stream flows for fish survival leads to better design of
hydroelectric facilities and better operating practices, consistent with the
conservation and protection objectives of the Fisheries Act. Research
is also being conducted on the effects of reservoir creation on mercury
availability. Flooding caused by reservoir creation can lead to elevated
levels of mercury in the water and fish.
An example of successful science-based fishery management is the Exploits
River in Newfoundland, which supports one of the largest Atlantic salmon
runs in North America. The Exploits has two major power dams and several
pulp mills. DFO has worked for several decades at improving salmon
production, including conducting research on the environmental impacts of
pulp & paper and hydro facilities. Since 1997, Environmental Scientists in
Newfoundland have worked with Abitibi Consolidated Company of Canada, the
Exploits River Management Association, the Universities of Waterloo and
British Columbia, and consulting firms to provide scientific advice on the
construction of a by-pass system to allow fish to get safely past the
turbines. As a result, downstream fish passage has increased. Overall, the
salmon population has been steadily increasing due to, both, an enhancement
program of stocking and the fishway by-pass.
Oil & Gas
In light of recent international pressures on oil supply and cost, oil & gas
related activities have increased on Canada’s coasts. The oil & gas
moratorium on the Pacific Coast is currently being re-evaluated and in
Atlantic Canada oil & gas exploration and development is expanding. There is
renewed interest in exploration in the Mackenzie Delta and Beaufort Sea.
Science research and advice is required by the Habitat and Oceans branches
to support their decision-making related to marine ecosystem conservation.
Advice is provided on a range of issues from the effects of seismic surveys
on marine species and ecosystems to the effects of drilling operations,
production systems and the decommissioning of oil drilling platforms.
Targeted scientific research and expertise is used to provide timely,
informed science advice to DFO decision-makers to support their policy
development related to marine ecosystem conservation.
Environmental Science at DFO acquires scientific understanding of marine
ecosystems through a coordinated national program of targeted research that
focuses on ecosystem impacts of offshore oil & gas activities. We also
provide scientific information and advice to support conservation and
protection of marine ecosystems and the sustainable utilization of aquatic
resources.
DFO established the Centre for Offshore Oil and Gas Environmental Research (COOGER)
to coordinate the department’s nation-wide research on the environmental and
oceanographic impacts of offshore petroleum exploration, production and
transportation. COOGER addresses the departmental mandate and industry need
by providing scientific knowledge for use to ensure safe and environmentally
sound management of offshore oil and gas operations.
Centre for Offshore Oil and Gas
Environmental Research
Toxic Contaminants
Canada has over 35,000 chemical substances in commercial use. An
overwhelming majority of existing chemicals have not been tested for
toxicity, and very little data exist on these substances. To reduce the
impacts of toxic chemicals on fish, fish habitat and fishery resources, DFO
conducts research on toxic chemicals. This provides the scientific advice
necessary in the regulatory and policy decision-making process.
The desired end-point of the toxic chemicals research is the identification
of the biological impact of toxic chemicals on aquatic ecosystems and the
understanding of how these changes are reflected in the health of the
fishery resource. The issues facing toxics research are broad and range from
cellular to population levels; from marine to freshwater systems; toxic
sources such as agriculture, municipal effluent, energy development, pulp
mills and aquaculture; and are responsive to a variety of federal
legislation [e.g., Fisheries Act, Oceans Act, Canadian Environmental
Assessment Act, Pest Control Products Act]. To understand and advise on
these issues requires not only the individual expertise of the researcher,
but that of a research team that is usually multi-disciplinary,
multi-regional and multi-sectoral.
Examples of current research by DFO on toxic chemicals include:
- The effects of exposure to pesticides and nonylphenol on juvenile
lobster and salmon smolts;
- the effects of submarine mine tailings disposal, salmonoid aquaculture
wastes and sewage outfalls on fish, fish habitat and marine ecosystems;
- ecosystem assessment of marine environmental quality;
- the use of health tracers to study the effects of toxic chemicals on
free-ranging marine mammals; and
- the impact of pesticides on fish in Newfoundland Labrador, St.
Lawrence Estuary, Ontario, Manitoba and British Columbia.
A key outcome of a recent review of toxic chemical research in DFO was
the conclusion that DFO’s toxics research should allocate higher priority to
biological impacts. A peer review of toxic chemicals will be conducted to
support the refocused toxic chemicals research program. Teams of DFO
scientists will draft working papers exploring the following themes:
- Impacts of classes and mixtures of toxics on endpoints;
- ecological interactions with other factors;
- marine mammals; and
- sentinel species and best practices in monitoring.
The National Contaminants Information System [NCIS] is a computerized
warehouse of information on toxic chemicals in fish, other aquatic life and
their habitats. It was built to help manage the growing base of data and
information related to contaminants and contains millions of records, dating
back to 1970.
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