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EPT Richness by Subwatershed

EPT Richness by Subwatershed. EPT Richness = number of species of mayflies (“Ephemeroptera”), stoneflies (“Plecoptera”) and caddisflies (“Trichoptera”). Woods tended to have lower numbers of these sensitive species. pink diamonds = median for subwatershed.

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EPT Richness by Subwatershed

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  1. EPT Richness by Subwatershed EPT Richness = number of species of mayflies (“Ephemeroptera”), stoneflies (“Plecoptera”) and caddisflies (“Trichoptera”) Woods tended to have lower numbers of these sensitive species pink diamonds = median for subwatershed

  2. Observed/Expected Scores by Subwatershed Observed/Expected is a score developed by the Oregon Dept. of Environmental Quality that compares the number of species you observed at your site to the number typically observed at healthy “reference” sites. A score of 1 means your site is comparable to a healthy watershed. The lower the score the poorer the stream health

  3. Woods stations that consistently scored poorly Woods had high amounts of canopy and low amounts of impervious surfaces, but poor stream insect communities. Poor stream habitat (fine-grained stream bottom) or pollutants in the water may possibly explain why Woods Creek has poor insect communities in spite of having lots of trees.

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