1. EUTROPHICATION
By: Annette Miles

2. Eutrophication occurs when large quantities of nutrients such as _______ and ___________ enter an aquatic environment which causes the excessive growth of water plants.
nitrates
phosphates

3. The plants that grow in excess are known as _____________
The plants that grow in excess are known as _____________. The abundance of these plants can have devastating effects on the animals present in the water.
phytoplankton
The plants consume the _______ dissolved in the water which causes the _______ of many animals.
oxygen
death

4. There are several causes of eutrophication
There are several causes of eutrophication. One is the runoff of excessive _________ used for agricultural purposes.
fertilizers

5. It is also caused from the water runoff from ______ and __________ areas.
urban
residential

6. The water ecosystem quickly experiences an increase in phytoplankton, ______ ____________, as these organisms thrive in the presence of the added nutrients.
blue-
green algae

7. An algae ______ occurs as the algae accumulates into dense, visible patches near the surface of the water, keeping _____ from penetrating into deeper areas of the lake or stream.
bloom
light
Blue-green algae bloom

8. An algal bloom off the coast France, colors the water bright blue.

11. Some fish are unable to _______ without this light, but for them an even more serious problem arises when the algae begin to die.
survive

12. At this point, oxygen-demanding ________ take over the ecosystem, decomposing the algae and using up dissolved ________ in the process. This lower concentration of oxygen causes many fish to suffocate, and as they die, the number of oxygen-demanding decomposers increases even more.
bacteria
oxygen

16. How can we help prevent eutrophication?
Planting vegetation along streambeds to
slow erosion and absorb nutrients.
Control the application amount and
timing of fertilizer.
3. Controlling runoff from feedlots.

17. RESOURCES