What types of pollution exist in our water?. Pathogens Disease causing organisms such as bacteria,...
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Transcript of What types of pollution exist in our water?. Pathogens Disease causing organisms such as bacteria,...
Pathogens
Disease causing organisms such as bacteria, viruses, protozoa and parasitic worms
Don't Drink the Water!!!
Thermal Pollution• Changed dissolved oxygen• Alters distribution of organisms
among major and minor communities.
• Death of some types of animals• Changes to reproductive powers and
increased susceptibility to disease• Changes in migration time and
pattern may be affected.• Decrease in productivity of the water
body .• Economic and environmental damage
Toxic Substances - Cadmium
• From Mining• From Burning
Fossil Fuels• From Leaking
Batteries• Known
Carcinogen
Toxic Substances - LeadCorrosion of household plumbing systems
Short term exposure: Gastrointestinal distress
Long term exposure: Liver or kidney damage
Toxic Substances - PCBs
• http://www.youtube.com/watch?v=AlWLBRQo278
Toxic Substances – Agent Orange
• Used as an herbicide in Vietnam– military strategy
• Killed hundreds of thousands of Vietnamese people
• Caused major birth defects in hundreds of thousands of Vietnamese children
• Biomagnifies through the food chain• Carcinogenic
Toxic Substances - Mercury
• Link to Eating Mercury Safe Fish Pocket Guides by Region
Toxic Substances - DDT
• Pesticide used largely in 40’s and 50’s to kill insects that carried diseases like Typhus and Malaria (efforts were unsuccessful)
• Health Effects exposed in Rachel Carson’s “Silent Spring” – helped lead to its ban in 1972
Toxic Substances - DDT
• Biomagnifies - putting top predators most at risk (especially predatory birds)
• Thins shells of birds• Linked to decline of Bald
Eagle, Brown Pelican, Peregrine Falcon and Osprey
• Also linked to reproductive problems and endocrine problems in humans
http://youtu.be/-UiCSvQvVyshttp://youtu.be/MMSEnIVFBQ0
Bioaccumulation vs. Biomagnification
• Bioaccumulation– The process of toxins
building up in an organism over time through absorption or ingestion
• Biomagnification– The increase in
concentration of a toxin as it moves up the food chain
– Lower trophic levels have LOW levels
– Highest trophic level would have HIGHEST levels
How are “biomagnification” and “bioaccumulation” connected to human health? - discuss with a partner and come up with one example
1. List three categories of pollutants found in our freshwater resources.
2. What is the difference between biomagnification and bioaccumulation?
3. How are point and non-point source pollution connected to biomagnification and bioaccumulation?
Wrapping Up…