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Joe’s Creek.

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Presentation on theme: "Joe’s Creek."— Presentation transcript:

1 Joe’s Creek

2 Bioaccumulation The gradual build up over time of a chemical in a living organism. The chemical is either taken up faster than it can be used or because it cannot be broken down (metabolized) at all. Occurs within a trophic level Examples: Heavy metals, pesticides, organic chemicals (nitrates, urea, etc.)

3 Bio-magnification The process by which concentrations of a contaminant increase as you move up the food chain Occurs between trophic levels Examples: DDT and heavy metals like mercury, lead, cadmium and zinc

4 Analysis: Group Discussion
Do you think bioaccumulation of toxic compounds has the potential to affect humans? Why or why not?

5 Bald Eagle Article List 3 reasons why eagle populations declined.
What affect did DDT have (physiologically) on bald eagles? What was done in response to the decline to boost eagle populations?

6 Amoeba Sisters: Bioaccumulation & Biomagnification
Video Clip Amoeba Sisters: Bioaccumulation & Biomagnification

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