Bioaccumulation and Biomagnification

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Bioaccumulation and Biomagnification

• Bioaccumulation a toxin that remains in body
  tissue.
• Toxins that bioaccumulate include PCBs, DDT and
  mercury.
• Biomagnification an increase in the
  concentration of a substance in organisms higher
  up the food chain.
• This occurs because each step in the food chain
  must consume a greater amount of the previous
  level.

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Concentration of a toxin increases up a food
chain.
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• King mackerel is a fish that tends to be high
  in mercury, tilapia is a fish that is usually low
  in mercury contamination. Predict what that
  indicates about their roles in the food chain.
• Fish that are high in mercury contamination
  tend to be fish at the top of the food chain
  (king mackerel, shark).

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Biomagnification Video
http//www.youtube.com/watch?vE5P-UoKLxlAlistPL
6158B408E7834487