What kind of organisms are living in the stream? After an explanation on how to use a dichotomous key, groups of three to four use the keys to identify macroinvertebrates from a local freshwater stream. Using the the concept of Stream Index Values, the groups then determine the water quality of the stream. The lesson is part one of a two-part series on dealing with macroinvertebrates.

Concepts

dichotomous keys, organisms, macroinvertebrates, technology resources

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Instructional Ideas

• Use parts of the PowerPoint presentation that are relevant to the lesson as a reference for the class

Classroom Considerations

• Requires a source of macroinvertebrate specimens
• Must have access to dichotomous keys for identification purposes

Pros

• Provides instructions on how to collect specimens
• Includes a section of safety precautions

Cons

• The PowerPoint presentation is an overview of the entire series of lessons used as a conference presentation