Criteria are for species-level identification of most insects, rhyacophilids to subgroup, and chironomids to genus. Square braces indicate the value next to the brace is included in the range; rounded parentheses indicate the value is not included.
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Scoring Criteria |
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Metric |
1 |
3 |
5 |
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Taxa richness and composition |
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Total number of taxa |
[0, 20) |
[20, 40] |
> 40 |
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Number of Ephemeroptera (mayfly) taxa |
[0, 4] |
(4, 8] |
> 8 |
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Number of Plecoptera (stonefly) taxa |
[0, 3] |
(3,7] |
> 7 |
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Number of Trichoptera (caddisfly) taxa |
[0, 5) |
[5, 10) |
> 10 |
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Number of long-lived taxa |
[0, 2] |
(2, 4] |
> 4 |
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Tolerance |
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Number of intolerant taxa* |
[0, 2] |
(2, 3] |
> 3 |
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% of individuals in tolerant taxa* |
> 50 |
(19, 50) |
[0, 19] |
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Feeding ecology |
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% of predator individuals |
[0, 10) |
[10, 20) |
> 20 |
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Number of clinger taxa |
[0, 10] |
(10, 20] |
> 20 |
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Population attributes |
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% dominance (top 3 taxa) |
> 75 |
[50, 75) |
[0, 50) |
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*Chironomids are not included in these metrics. |
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