Download Lesson 03b - Eutrophication 24Apr2014.notebook

Lesson 03b ­ Eutrophication 24Apr2014.notebook
Eutrophication
April 24, 2014
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Video on Lake Winnipeg
Condensation
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Video on blue green algae near cottages
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­ Eutrophication is a process in which deposits of excess nutrients cause an _____________________________ in an aquatic ecosystem. source: www.mnr.gov.on.ca
What is the process of eutrophication?
1) The cause of eutrophication are _______________________(mainly nitrogen and phosphorous nutrients). The source of these nutrients can include _______, ___________, and _____________ __________________ applied to farm lands, as well as phosphates found in __________________.
2) These excess nutrients mix with rain water and ______ ______ into water bodies where it increases the growth of __________. 3) This rapid growth of algae forms __________ ____________ which often float on the waters' surface and can block _______________________ from reaching plants in the water, causing them to die.
4) Eventually, the algal blooms die and ___________. Bacteria involved in decomposing the algae use up ____________________________ in the water causing dissolved oxygen levels in the water to decrease. 5) Less oxygen in the water causes __________ and other _______________ organisms to die.
sink
excess nutrients
aquatic
soil
manure
synthetic fertilizers
algae
detergents
algal bloom
sunlight
Blue Green Algae
run off
algal blooms
oxygen
fish
Watch the video and answer the following questions. What are blue­green algae? _____________________________________________________________
What causes them to proliferate? _________________________________________________________
___________________________________________________________________________________
Why are they a problem? _______________________________________________________________
___________________________________________________________________________________
Name three ways to reduce their growth:____________________________________________________
Why do you think the 10 m naturalized band by the shoreline can help to reduce the proliferation of the algae? Why should shoreline residents not grow grass right up to the water? Can you think of other human activities that may promote blue­green algae growth?
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