What types of pollution exist in our water?. Pathogens Disease causing organisms such as bacteria, viruses, protozoa and parasitic worms.

What types of pollution exist in our water?

Pathogens

Disease causing organisms such as bacteria, viruses, protozoa and parasitic worms

Don't Drink the Water!!!

Organic Matter: Where did they come from?

Agricultural Run-off

Nutrients/Organic Matter Eutrophication

1. What causes Eutrophication?

2. What can you do to prevent eutrophication?

Acid Rain

Salting Roads

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

Toxic Substances - Mercury

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…

Great Blue Heron

Fluke

Sheepshead Minnow

Sea Lettuce