Leaf Pack Experiment Details at Lexington Montessori Beaver Brook
Placement Information

Placement Date April 23, 2025
Number of Packs Placed 12
Placement Air Temperature 18.3 °C
Placement Water Temperature 14.4 °C
Stream Habitat Type Riffle
Leaf Pack Type and Composition

Predominant Leaf Species:

Maple
Oak
Hickory


Retrieval Information

Retrieval Date May 20, 2025
Number of Packs Retrieved 11
Retrieval Air Temperature 15.5 °C
Retrieval Water Temperature 14.4 °C
Storm and Non-Storm Events

Did storms occur while your leaf packs were in the stream? Unknown
Did flooding occur? Unknown
Was this site experiencing a drought during your experiment? No

Summary Analysis
Results Overview

Total Number of Individuals Found 309
Pollution Tolerance Index Score 16
Pollution Tolerance Index Rating Fair - Substantial pollution likely
Percent EPT 1.29%




Comments

We also found 6 juvenile yellow spotted salamanders. This was a collaborative project between 7th/8th graders and 3rd grade buddies. We do this project every 2 years. The site where we did the monitoring is next to a culvert that comes under a small highway. The water was between 1 and 2 and a half feet deep.