Scientific Investigations Report 2006–5101–D
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5101–D
Table A8. Invertebrate variables.
[Abbreviations: EPT, ephemeroptera, plecoptera, trichoptera (mayflies, stonefiles, caddisflies); EPEM, Ephemeropera; USEPA, U.S. Environmental Protection Agency; PLECO, Plecoptera; nMDS, non-metric dimensional scaling an ordination technique]
| Description | Variable code | Definition |
|---|---|---|
| EPEM abundance | EPEM | Abundance of mayflies |
| EPEM richness | EPEMR | Richness composed of mayflies |
| EPT/chironomid ratio | EPT_CHR | Ratio of EPT richness to midge richness |
| EPT richness | EPTR | Richness composed of mayflies, stoneflies, and caddisflies |
| PLECO percent | PLECOp | Percentage of total abundance composed of stoneflies |
| PLECO richness | PLECOR | Richness composed of stoneflies |
| Other diptera percent richness | ODIPNIRp | Percentage of total richness composed of non-midge Diptera and non-insects |
| Intolerant abundance | Intol_abund | Abundance-weighted USEPA tolerance value for intolerant taxa |
| Tolerant richness | RICHTOL | Average USEPA tolerance values for sample based on richness |
| Tolerant percent richness | RICHTOLp | Average USEPA tolerance values for sample based on percent richness |
| Tolerant abundance | ABUNDTOL | Abundence-weighted USEPA tolerance value for sample |
| Amphipod percent | AMPHIp | Percentage of total abundance composed of Amphipoda |
| Noninsect percent richness | NONINSRp | Percentage of total richness composed of noninsects |
| Oligochaet percent richness | OLOGORp | Percentage of total richness composed of Oligochaeta |
| nMDS Axis1 score | nMDS axis 1 | Axis 1 values from a bi-plot of 2-dimensional distribution based on multivariate similarities |
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2006/5101-D
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