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myuren
Joined: Mar 21, 2003
Posts: 8 (view all)
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Province/State: Ontario
City: Toronto
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Toxic substances in the food chain?
April 4, 2003 - 07:37 AM
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Excess nutrients such as nitrogen and phosphor compound come mainly from municipal sewage and farm run-off containing fertilizers and animal waste.These nutrients can cause excess growth of aquatic plants,which then die and decay ,depleting water of dissolved oxygen and killing fish.
Sedimentation is an increase in the amount of solid particles in water,caused primarily by human activities such
as forestry,farming and construction.When sediment settles,
it can smooth the feeding and dispawning grounds of fish and kill aquatic organisms.
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