Buffalo Creek Union Slough NWR
Analysis Summary for Series #2918
Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)
| Metric Name | Value | Score |
|---|---|---|
| MH Total Taxa | 25 | 4.81 |
| SH Total Taxa | 11 | 4.85 |
| MH EPT Taxa | 10 | 3.7 |
| SH EPT Taxa | 7.33 | 4.99 |
| MH Sensitive Taxa | 4 | 3.64 |
| SH Ephem % | 32.17 | 4.11 |
| SH EPT % | 81.92 | 8.58 |
| SH Chiron % | 13.02 | 8.79 |
| SH Scraper % | 11.31 | 2.53 |
| SH Top3Dom % | 76.63 | 3.71 |
| SH Dom FFG % | 50.47 | 8.26 |
| MHBI | 5.24 | 6.52 |
| *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 | 10/8/2025 |
| Sampling Series | Series #2918 |
| Drainage Area (mi2) | 156 |
| Log(DA) | 2.19312459835446 |
| Calculation Last Updated | 3/23/2026 10:39:07 AM |
| Sampling Gear | Anchored ArtSub |
Warm Water
Fair
BMIBI Score Explained
This site was analyzed using the BMIBI-Warm Water assessment methodology.
Sites that score between 31 - 55 are considered fair. Total taxa richness and EPT (Ephemeroptera, Plecoptera, Trichoptera) taxa richness are noticeably reduced from optimum levels; sensitive species and habitat specialists are rare; EPT taxa are still dominant in abundance; however, the most-sensitive EPT taxa have been replaced by ept taxa that are more tolerant of organic enrichment; the community is not well-balanced; a few taxa clearly dominate in abundance, collector-gatherers or collector-filterers often comprise more than 50% of the community.
This location has been classified as a survey site. Survey sites are compared to reference sites within the same ecoregion. A reference site represents natural stream qualities that are least disturbed by human activities within the watershed. Reference sites are grouped by ecoregion to establish a benchmark against which these survey streams are compared.
EcoRegion Comparison
Scores for a sampling session are compared against reference sites within the same ecoregion:
| Max | 84 |
| 75th Percentile | 67 |
| Median | 59 |
| 25th Percentile | 50 |
| Min | 10 |
| This Session's Score | 54 |
| Total Reference Site Samples | 173 |
| Mean | 57.64 |
| Standard Deviation | 13.14 |