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Now I see that Sites 1 and 2 are further downstream, not upstream, as I had assumed. In both areas, your data indicates the creek’s temperature and pH have returned to normal levels for a mountain stream.

Yes, and once the creek passes beyond the influence of hydrothermal activity, the EPT species represent a fairly large percentage of the total macroinvertebrates. This is a sign that the water quality in Sites 1 and 2 is good. Obsidian Creek certainly reflects Yellowstone in its natural state—and so does the Firehole River!

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Cast of characters - Maya Crowbes, Dr. A Beadle, Gray Fischer, Viola DeRama
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Q: What do the EPT species indicate about the water quality of Obsidian Creek at Sites 1?

QUIZ 2 of 4: Question 11-20 (12KB pdf)