Richfield STEM School 2013
Richfield STEM School
7020 12th Ave S
Richfield, MN 55423
Breathing Underwater Part 1: WATER WORKS -- A Comparison of Dissolved Oxygen/pH and Water Quality in Two Ponds
Erin J, Abby K
This is the first in a three-part study comparing the water quality in two Richfield ponds. After sampling invertebrates as potential water quality indicators in each pond, we wondered about the changing daily relationship between dissolved oxygen and pH at each pond, and what that chemistry might indicate about water quality of the invertebrate habitat. We found some dramatic changes and differences in pH levels, but were puzzled by the results for dissolved oxygen. One of our conclusions was that we needed a better DO test.
Breathing Underwater Part 2: Macroinvertebrate Neighborhoods - A Comparison of Macroinvertebrates and Water Quality in Two Ponds
Sara S, Tsundrul P
This is the second in a three-part study comparing the water quality in two very different Richfield ponds. One pond was a large wetland full of cattails. The other was a small storm water pond with few cattails. After informally sampling invertebrates in each pond, we wondered if the invertebrates in each pond would be different or the same, and what that might imply about the water quality(or Pollution Tolerance Index) for each pond.
Breathing Underwater Part 3: The Hunger Games: Who Eats Who?
Adam N, Gabriela B, Kaycee C, Natalie S
This is the third in a three-part study comparing the water quality in two very different Richfield ponds. While identifying macro-invertebrates (indicators of water quality) that we had sampled from each pond we noticed that one invertebrate in a sample appeared to be attacking another species of invertebrate. We began to wonder which invertebrates were predators and prey, and decided to set up an investigation to find out, and so, the Hunger Games began!