Warmup-
Symbiosis WorksheetGet out Homework and turn it in!!
Essential Question-
What happens when humans introduce chemicals into the
environment?
Bioaccumulation & Bioaccumulation & BiomagnificationBiomagnification
Chemicals in our EnvironmentChemicals in our Environment
BioaccumulationBioaccumulation
The gradual The gradual buildupbuildup, over time, of a , over time, of a chemicalchemical in a in a LIVING ORGANISIMLIVING ORGANISIM
Why Does This Happen?Why Does This Happen?
Chemicals are taken up faster than they Chemicals are taken up faster than they are usedare used
OrOrChemicals can’t be broken down by the Chemicals can’t be broken down by the
organism for useorganism for use
PollutantsPollutants
Chemical pollutants that are Chemical pollutants that are bioaccumulated come from many sourcesbioaccumulated come from many sourcesPesticidesPesticides Industrial Smoke StacksIndustrial Smoke StacksAutomobile EmissionsAutomobile EmissionsDeliberate Discharge of Compounds into Deliberate Discharge of Compounds into
WaterWater
BiomagnificationBiomagnification
The buildup of substances by successive The buildup of substances by successive trophic trophic levelslevels
ExampleExample: A predator will have higher concentrations : A predator will have higher concentrations of a chemical compared to its preyof a chemical compared to its prey
DDTDDT
Soil(Soil(10ppm10ppm))Earthworms(Earthworms(141ppm141ppm))Robins(Robins(444ppm444ppm))
1 unit
2 units
6 units
12 units
24 units
DDTDDT
DDicholoro-icholoro-ddiphenyl-iphenyl-ttrichloroethanerichloroethaneAn insecticide used in the 40’s, 50’s and 60’sAn insecticide used in the 40’s, 50’s and 60’sentered the environment in run-off from landentered the environment in run-off from landWas banned in 1972 after the Bald Eagle Was banned in 1972 after the Bald Eagle
population had a noticeable crash.population had a noticeable crash.
What is the difference
Biomagnification Bioaccumulation