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Pollution. Any substance added to the environment that is harmful to organisms. Types…. Pollution can poison the air, water, soil. 1) Toxic Chemicals 2) Air Emissions (Acid Rain, Smog, Ozone Depletion, Greenhouse Gases) 3) Sewage 4) Garbage 5) Fertilizers 6) Pesticides

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PowerPoint Slideshow about ' Pollution' - alyssa


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pollution

Pollution

Any substance added to the environment that is harmful to organisms.

types
Types….

Pollution can poison the air, water, soil.

1) Toxic Chemicals

2) Air Emissions (Acid Rain, Smog, Ozone Depletion, Greenhouse Gases)

3) Sewage

4) Garbage

5) Fertilizers

6) Pesticides

7) Soil erosion and run-off

8) Ground Water Contamination

9) Thermal Pollution

10) Urban and Rural

our focus
Our Focus
  • Bio-accumulation or Bio-magnification of Persistent Chemicals and Heavy Metals
  • Eutrophication or Nutrient Pollution of Water
persistent chemicals
Persistent Chemicals
  • They are toxic
  • They resist bio-degradation
  • They bio-accumulate
  • They can be transported through air, water, and species far from their place of release
examples of persistant chemicals
Examples of Persistant Chemicals
  • Pesticides - Aldrin, Chlordane, DDT, Dieldrine, Endrin, Heptachlor, Mirex, Toxaphene (Camphechlor), Hexachlorobenzene
  • Produced unintentionally as a result of combustion - Dioxins, Furans
  • Used in manufactured goods - Polychorinated biphenyls (PCBs)
heavy metals
Heavy Metals
  • Lead, Mercury, Arsenic, Cadmium, Copper, Zinc, Chromium, Uranium, Nickel
bio accumulation or bio magnification1
Bio-accumulation or Bio-magnification

Persistant toxic chemicals accumulate in organisms higher up the food chain, because they live longer and eat more.

lake ontario pollution
Lake Ontario Pollution

http://archives.cbc.ca/environment/pollution/topics/1390/

(Scroll to video #18 “IJC warns against eating Great…”)

Or go to digital video archives…environment…

slide17

Eutrophic Lakes (unnatural)

  • Cloudy water due to

lots of algae and plankton

(high turbidity)

  • Low O2 concentration
  • Poor light penetration
  • Nutrient enriched
  • Lots of decomposition
  • Lower fish biodiversity

Oligotrophic Lakes

(most lakes)

  • Clear water (low turbidity)
  • High O2concentration
  • Good light penetration
  • Nutrient deficient
  • Higher fish biodiversity
cultural eutrophication sequence
Cultural Eutrophication Sequence
  • Humans add nutrients to a water system.

eg. Fertilizers (nitrates, phosphates)

eg. Soaps and detergents

eg. Sewage and manure

  • Phytoplankton and algae (plants) thrive on the nutrients (algal bloom).
  • Increased algae growth causes more decomposition by bacteria and decomposers.
  • Increased bacteria lowers the dissolved O2 concentration in the water.

Result = Kills species, especially fish that need a higher concentration of dissolved O2 to survive.

biological oxygen demand b o d
Biological Oxygen Demand(B.O.D.)

A measure of the amount of dissolved oxygen (D.O.) needed by decomposers (bacteria) to break down organic matter in a water system. (measured over a 5 day period)

lake erie recovery
Lake Erie Recovery
  • Ban on phosphates in soaps and detergents
  • Reduced use of fertilizers
  • Better sewage treatment
  • Better manure storage
  • Zebra mussels

http://video.nationalgeographic.com/video/player/environment/habitats-environment/freshwater/lake-erie.html

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