Testing water quality is critical for knowing if the waterway is suitable for organisms to thrive; so this week, our class analyzed the water quality on the Rio Chama through multiple sampling techniques.
Before we began testing water quality, though, we had a surprise for the students …
When I’m not teaching River Classroom, I also work in the ICU at NMWC, so I brought along a juvenile male Cooper’s Hawk to release back into the wild. I explained the natural history and ecology of Cooper’s Hawks to the students and then it was time to set him free!
Once the excitement settled down, we split the students into 2 groups. The first group collected benthic macroinvertebrates using a 1m x 1m square net with 2 students holding it on each side. Then two other students go 2m upstream from the net and kick up macroinvertebrates from the substrate, while slowly walking towards the net. This mode of collection is a version of the kick-sampling method.
Students then removed all the macroinvertebrates from the net using forceps and put them into a collection jar with isopropyl alcohol for the teachers to count and ID at a later time. Each sampling site was given a separate collection jar and GPS coordinates were taken at the sites as well.
The second group learned all the different components of testing water quality through a fun activity of making foldables! We explained each component (e.g. pH, conductivity, etc.), what units they are measured in, and gave a brief explanation/example.
Once that task was complete, the students collected several samples of water from the river so we could test the various components using Vernier water quality probes.
The students switched groups after lunch so everyone got a chance to participate in both activities.
This was our first ‘real’ river sampling session, so students familiarized themselves with the numerous water quality testing techniques. The class will be conducting at least two more river samplings this year, so stay tuned for what happens next!