Bioaccumulation & Biomagnification

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Presentation transcript:

Bioaccumulation & Biomagnification Chemicals in our Environment

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

Why Does This Happen? Chemicals are taken up faster than they are used Or Chemicals can’t be broken down by the organism for use - can’t get rid of chemicals bc they get suck in “adipose” tissue

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

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

i.e. mercury in salmon

24 units 12 units 6 units 2 units 1 unit

DDT Dicholoro-diphenyl-trichloroethane An insecticide used in the 40’s, 50’s and 60’s entered the environment in run-off from land Was banned in 1972 after the Bald Eagle population had a noticeable crash. - DDT affected reproduction of fish eating birds - banned in 1970s

What is the difference Biomagnification Bioaccumulation