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Description
The slimy mats of algae growing in a freshwater habitats like marshes or rivers may not be very appealing but are vital to maintaining ecosystem health. Algae are of fundamental importance to aquatic food webs, produce large amounts of oxygen and help filter pollutants such as excessive nutrient runoff. However, these simple organisms can also create toxic “algal blooms” when natural conditions are disrupted. In this activity students collect samples of pond water and analyze how algal growth is affected by pollution. As they conduct their scientific investigation students will:
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Plan an experiment and predict results.
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Quantify how algae are impacted by simulated acid rain and phosphorus from fertilizers.
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Analyze data and interpret results in relation to predictions.
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Use the experiment to support discussions about human impacts on freshwater ecosystems.
General Assessment
Recommendation of how and where to use it
This activity takes students outside to collect samples and actively engages them in practicing science skills such as observation and critical thinking. The lesson also supports curriculum examining plant growth, habitats, interactions within aquatic ecosystems, water quality and pollution. The content can be used to reinforce non-point and point source pollution concepts and explore the relationship between humans and the environment.
The experiment could also form the basis of a classroom action project where students work with the municipality and garden organizations to develop strategies for reducing the use of chemical fertilizers/pesticides in the community. Comparing water quality from local wetlands in polluted areas and non-polluted spaces could be used to raise public awareness of the harm caused by substances like chemical pest control products and promote organic gardening.
Relevant Curriculum Units
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Themes Addressed
Air, Atmosphere & Climate (1)
- Acid Rain
Ecosystems (1)
- Habitat Loss
Water (1)
- Water Quality
