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Below, I have briefly summarized some of the lesson ideas that I brainstormed during the course. These place-based lessons/units still need more details added to them, but they are a start.
Water Quality on the Mendenhall River, Above and Below the Sewer Treatment Plant
The water quality of Mendenhall River, above and below the sewer treatment plant, would be tested by the class, who would be looking at a number of different parameters. This unit would be part of a bigger ecology unit in an effort to make it more meaningful for students. We all use the sewer system, but it is easy to forget what happens to the waste once the toilet is flushed, so this unit might help students see how our actions directly affect the ecosystem, sometimes in surprising ways. I thought of this idea partly because I read an article in Discover magazine, a few years ago, that discussed how bacteria growing below sewer-treatment plants tended to be more resistant to antibiotics. I also read a recent article, in National Geographic, that discussed the high levels of chemicals entering our water systems through the sewer. (Note: the photo to the above left was of taken in downtown Juneau. The photo shows the water falling from the newly installed fountain in the park of of Franklin Street).
Unfortunately, I do not think we would have the materials/equipment to test for certain chemicals, but we could still do some quantitative tests of the area. We could probably test the following, above and below the sewer-treatment: resistance of bacteria to certain antibiotics, numbers of fecal coliform bacteria, dissolved oxygen, pH, turbidity, types and quantity of vegetation, protists, and invertebrates. We could probably test for a few other chemicals in the water, but I would need to see what test kits we have access to. If the sewer-treatment plant was willing to give us a tour, that would be really neat. In an effort to give the students an audience, I would need to brainstorm a relevant audience for them to present their finding to.
Comparative Sample Plots:
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This project seems somewhat simple, but I thought it might give students an up close view, of a small piece of our ecosystem. Students would be responsible for counting and cataloging the living creatures on two different 1 meter by 1 meter plots of land (or smaller). These creatures would probably mostly include plants and invertebrates (we probably would not do the same for the microorganisms on the plot of land, but we could discuss their importance). In addition, students would need to report on some of the other aspects of the plot, such as soil type, soil pH, amount of water in the soil, elevation, and amount of direct sunlight.
For a project like this, it might make more sense to have students visit their plot on multiple occasions, but this might depend upon how close the plots are to the school. Just for fun, it might be neat to see how the plots have changed from the fall to the spring. This plan definitely needs fleshed out, more, and it would need intertwined with a larger ecology unit to be meaningful for students. (Note: the photo to the above left was taken over on Douglas Island, up above the Sandy Beach area)
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(Note: I would need to do some more research on this project before doing it with students because I need to learn more about the process of nitrogen fixation by bacteria...specifically what form of nitrogen is formed when bacteria fix nitrogen. If the form is not a nitrate, this experiment would not really make sense to do because the nitrogen might be bound up in a form we could not test for).
One of the high school science standards involves knowledge of geochemical cycles such as the nitrogen cycle. In an effort to make this experiment more applicable to the students, we could do a class experiment where students test the relative nitrate levels in different types of soil around the school. First, we would discuss the nitrogen cycle, and how nitrogen, an important nutrient for plants (and animals, who get their nitrogen directly, or indirectly, from plants), is largely inaccessible for plants, in mosts forms. We would also discuss how nitrogen can be fixed from the atmosphere by bacteria, some of which have formed symbiotic relationships with certain plants, such as legume plants (peas, clovers and lupines, for example). (Note: the photo to the above left is of some lupines and it was taken just outside of Gustavus, Alaska)
The class would sample soil from different locations around Thunder Mountain High School: soil growing around the roots of TMHS's abundant lupines (a type of legume), soil growing around the roots of some other plant (maybe grass), and soil not growing directly around the roots of a plant, but in the same area. We would test the soil for nitrate, a form of nitrogen usable for plants, and we would see if there were any differences in levels of nitrate. I am not sure if we would find any differences, but I am curious to see if we would. As mentioned above, before attempting this experiment with the class, I would need to do some background research on usable types of nitrogen in the soil, to make sure that we weren't testing for the wrong form of nitrogen. I would probably do this experiment at the beginning of the year, as an example experiment to demonstrate the scientific method, thus, it would be a guided one.