1. Does anyone want to go for a swim?

2. How about swimming in this lake ?

3. What’s going on with the water?
Eutrophication

4. What is Eutrophication?
The enrichment of nutrients to water resulting in an increase of the primary production (growth of e.g. algae).
Natural eutrophication
sources of nutrients are naturally occurring
Cultural eutrophication
sources of nutrients result of human activity

5. Where does the green color come from?
Algae

6. YES So what are algae anyway? Are they plants? Are they protists?
Are they prokaryotic?
Are they eukaryotic?
Are they photosynthetic?
Are they microscopic?
Are they macroscopic?
YES

7. Algae – simple organisms composed of one cell, or grouped together in colonies, or as organisms with many cells, sometimes collaborating together as simple tissues.
Anabaena, a common bloom-forming, unicellular, prokaryotic cyanobacteria
Syprogyra, a common unicellular, eukaryotic, algae
Common types of algae can be seen here

8. This photo taken from a lake in Manitoba
This photo taken from a lake in Manitoba. A yellow barrier separates in inlet of a lake from the main body of water.
What’s going on here?

9. What do algae need to grow?
Sunlight
Water
Carbon dioxide
Oxygen
Nutrients
Phosphorous
Nitrogen
Potassium
Other inorganic substances

13. Potassium cycle
two views

14. Where do the excess nutrients come from?
Point Sources (specific, identifiable locations)
Wastewater effluent (municipal and industrial)
Runoff and leachate from waste disposal systems
Runoff and infiltration from animal feedlots
Runoff from mines, oil fields, unsewered industrial sites
Overflows of combined storm and sanitary sewers
Nonpoint Sources (specific source not identifiable)
Runoff from agriculture/irrigation
Runoff from pasture and range
Urban runoff from unsewered areas
Septic tank leaching (leaking)
Runoff from abandoned mines
Atmospheric deposition over a water surface
Other land activities generating contaminants