Bluebell Creek Millville
Analysis Summary for Series #1626
Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)
| Metric Name | Value | Score |
|---|---|---|
| MH Total Taxa | 37 | 10 |
| SH Total Taxa | 6.67 | 6.12 |
| MH EPT Taxa | 14 | 10 |
| SH EPT Taxa | 2.33 | 3.22 |
| MH Sensitive Taxa | 5 | 8.42 |
| SH Ephem % | 0.62 | 0.08 |
| SH EPT % | 5.04 | 0.53 |
| SH Chiron % | 69.58 | 3.07 |
| SH Scraper % | 0 | 0 |
| SH Top3Dom % | 91.53 | 2.94 |
| SH Dom FFG % | 91.51 | 1.41 |
| MHBI | 6.16 | 3.11 |
| *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 | 6/10/2013 |
| Sampling Series | Series #1626 |
| Drainage Area (mi2) | 5.745 |
| Log(DA) | 0.759290033024304 |
| Calculation Last Updated | 7/22/2025 3:27:17 PM |
| Sampling Gear | ArtSub |
Sessions used in this analysis
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and habitat specialists are rare; EPT taxa are still dominant in abundance; however, the most-sensitive EPT taxa have been replaced by ept taxa that are more tolerant of organic enrichment; the community is not well-balanced; a few taxa clearly dominate in abundance, collector-gatherers or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 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:
Paleozoic Plateau (Driftless Area)
This site is in the Paleozoic Plateau (Driftless Area) ecoregion.
| Max | 87 |
| 75th Percentile | 78 |
| Median | 70 |
| 25th Percentile | 62 |
| Min | 52 |
| This Session's Score | 41 |
| Total Reference Site Samples | 55 |
| Mean | 70.55 |
| Standard Deviation | 9.41 |