North Raccoon River Lake View
Analysis Summary for Series #1489
Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)
| Metric Name | Value | Score |
|---|---|---|
| MH Total Taxa | 36 | 6.92 |
| SH Total Taxa | 8.67 | 3.82 |
| MH EPT Taxa | 21 | 7.78 |
| SH EPT Taxa | 7 | 4.76 |
| MH Sensitive Taxa | 9 | 8.18 |
| SH Ephem % | 16.01 | 2.05 |
| SH EPT % | 34.73 | 3.64 |
| SH Chiron % | 64.69 | 3.57 |
| SH Scraper % | 7.85 | 1.76 |
| SH Top3Dom % | 82.45 | 2.79 |
| SH Dom FFG % | 67.32 | 5.45 |
| MHBI | 5.48 | 5.63 |
| *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 | 8/12/2013 |
| Sampling Series | Series #1489 |
| Drainage Area (mi2) | 709.218 |
| Log(DA) | 2.85077974949159 |
| Calculation Last Updated | 10/28/2025 3:09:27 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and habitat specialists are rare; EPT taxa are still dominant in abundance; however, the most-sensitive EPT taxa have been replaced by ept taxa that are more tolerant of organic enrichment; the community is not well-balanced; a few taxa clearly dominate in abundance, collector-gatherers or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 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 | 47 |
| Total Reference Site Samples | 173 |
| Mean | 57.64 |
| Standard Deviation | 13.14 |