1. By Juliet Dodd-o, Parker Edmunds, and Maggie Shutzler
Macroinvertebrates
By Juliet Dodd-o, Parker Edmunds, and Maggie Shutzler

2. Narrowwinged Damselfly
Macro Identification
Organism
Number Tv
Aquatic Worm 1 10
Sowbug 3 18
Dragonfly 2
9.0
Narrowwinged Damselfly
5.5
Swimming Mayfly
4.0
Crawling Mayfly
1.0
Other Mayfly
3.0

3. Organism Number Tv 2 11 3 10.5 4 16 Crane Fly 8.0 Other Fly 1 10
Hydrospycid Caddisfly 2 11
Non-Hydrospycid Caddisfly 3
10.5
Water Penny Beatle 4 16
Crane Fly
8.0
Other Fly 1 10
Left-Handed Snail
9.0
Right-Handed Snail
7.0
Totals 24
111

4. Family Index: 5.2
Water Quality: Good
Sample Density: 2.4
TAXA Richness: 1.4
IBI Score: 24
Impact Rating: Good

5. Analysis The reason that an index is beneficial to have during an experiment is that it allows for better organization and creates a universal way for graphing macroinvertebrates. The cons of using an index are that certain macros may be generalized into one group, such as “Aquatic Worm,” or do not make the list at all and are put into groups such as “Other Fly.” Macros, especially those that are put into the “Other” groups, may have higher or lower sensitivity rates depending on the species. But because they are all put into one group, the sensitivity rate is averaged out to be According to the index results, the stream quality is good. Due to a misunderstanding which led to a deficient number of macroinvertebrate specimens, there may be a high percent error.