Sage Creek Stephens Forest
Analysis Summary for Series #1802
Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)
| Metric Name | Value | Score |
|---|---|---|
| MH Total Taxa | 25 | 8.28 |
| SH Total Taxa | 4.5 | 3.88 |
| MH EPT Taxa | 5 | 3.49 |
| SH EPT Taxa | 1 | 1.29 |
| MH Sensitive Taxa | 2 | 3.17 |
| SH Ephem % | 1 | 0.13 |
| SH EPT % | 1 | 0.1 |
| SH Chiron % | 65.5 | 3.49 |
| SH Scraper % | 2 | 0.45 |
| SH Top3Dom % | 98.5 | 0.48 |
| SH Dom FFG % | 98 | 0.33 |
| MHBI | 6.8 | 0.74 |
| *Mouse-over metric for full name | ||
| **Final IBI is sum of scores multiplied by 0.8333 | ||
Analysis Factors
| Factor | Value |
|---|---|
| BMIBI Type | Warm Water |
| Sample Date | 8/8/2014 |
| Sampling Series | Series #1802 |
| Drainage Area (mi2) | 6.884 |
| Log(DA) | 0.837840861655523 |
| Calculation Last Updated | 7/22/2025 3:27:08 PM |
| Sampling Gear | ArtSub |
Sessions used in this analysis
Warm Water
Poor
It will be tough to get a good art. substrate deployment in this stream. It is flashy and is very small (low flow). The areas with decent velocity are generally less than an inch deep (at least this visit).
BMIBI Score Explained
This site was analyzed using the BMIBI-Warm Water assessment methodology.
Sites that score between 0 - 30 are considered poor. Severely impaired macroinvertebrate community. Low numbers of taxa present, sensitive species not present, EPT taxa are rare or not present; community extremely unbalanced; dominated by a few pollution tolerant organisms; some trophic functional feeding groups are not represented. Total numbers of organisms may be low. Total taxa richness and EPT taxa richness are noticeably reduced from optimum levels; sensitive species and habitat specialists are rare; EPT taxa no longer dominate the macroinvertebrate community. Taxa that are tolerant of organic enrichment and/or excessive sediment loads are dominant; the community is unbalanced; a few generalist taxa make up a high percentage of the organisms present; collector-gatherers or collector-filterers are very dominant.
This location has been classified as a Candidate Reference Site. Further study is required to determine if this site represents natural stream qualities that are least disturbed by human activities within the watershed.
EcoRegion Comparison
Scores for a sampling session are compared against reference sites within the same ecoregion:
| Max | 78 |
| 75th Percentile | 58 |
| Median | 52 |
| 25th Percentile | 42 |
| Min | 14 |
| This Session's Score | 22 |
| Total Reference Site Samples | 49 |
| Mean | 49.84 |
| Standard Deviation | 13.11 |