1. Warmup- Symbiosis Worksheet Get out Homework and turn it in!! Essential Question- What happens when humans introduce chemicals into the environment?

2. Bioaccumulation & Biomagnification Chemicals in our Environment

3. Bioaccumulation The gradual buildup, over time, of a chemical in a LIVING ORGANISIM The gradual buildup, over time, of a chemical in a LIVING ORGANISIM

5. Why Does This Happen? Chemicals are taken up faster than they are used Chemicals are taken up faster than they are usedOr Chemicals can’t be broken down by the organism for use Chemicals can’t be broken down by the organism for use

6. Pollutants Chemical pollutants that are bioaccumulated come from many sources Chemical pollutants that are bioaccumulated come from many sources Pesticides Pesticides Industrial Smoke Stacks Industrial Smoke Stacks Automobile Emissions Automobile Emissions Deliberate Discharge of Compounds into Water Deliberate Discharge of Compounds into Water

7. Biomagnification The buildup of substances by successive trophic levels The buildup of substances by successive trophic levels Example: A predator will have higher concentrations of a chemical compared to its prey Example: A predator will have higher concentrations of a chemical compared to its preyDDT Soil( 10ppm )  Earthworms( 141ppm )  Robins( 444ppm )

9. 1 unit 2 units 6 units 12 units 24 units

10. DDT Dicholoro-diphenyl-trichloroethane Dicholoro-diphenyl-trichloroethane An insecticide used in the 40’s, 50’s and 60’s An insecticide used in the 40’s, 50’s and 60’s entered the environment in run-off from land entered the environment in run-off from land Was banned in 1972 after the Bald Eagle population had a noticeable crash. Was banned in 1972 after the Bald Eagle population had a noticeable crash.

11. What is the difference Biomagnification Bioaccumulation