Cedar River Cedar Rapids (REMAP #410)
Analysis Summary for Series #2395
Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)
| Metric Name | Value | Score |
|---|---|---|
| MH Total Taxa | 42 | 8.08 |
| SH Total Taxa | 8.67 | 3.82 |
| MH EPT Taxa | 22 | 8.15 |
| SH EPT Taxa | 6.67 | 4.54 |
| MH Sensitive Taxa | 6 | 5.45 |
| SH Ephem % | 4.03 | 0.52 |
| SH EPT % | 15.68 | 1.64 |
| SH Chiron % | 82.51 | 1.77 |
| SH Scraper % | 2.48 | 0.55 |
| SH Top3Dom % | 90.58 | 1.5 |
| SH Dom FFG % | 84.94 | 2.51 |
| MHBI | 5.9 | 4.07 |
| *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 | 9/22/2020 |
| Sampling Series | Series #2395 |
| Drainage Area (mi2) | 6450 |
| Log(DA) | 3.80955971463527 |
| Calculation Last Updated | 7/22/2025 3:31:42 PM |
| Sampling Gear | Float ArtSub |
Warm Water
Fair
River level dropped through the artificial substrate deployment resulting in less than desirable, though acceptable, velocities.
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and habitat specialists are rare; EPT taxa are still dominant in abundance; however, the most-sensitive EPT taxa have been replaced by ept taxa that are more tolerant of organic enrichment; the community is not well-balanced; a few taxa clearly dominate in abundance, collector-gatherers or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 | 91 |
| 75th Percentile | 75 |
| Median | 66 |
| 25th Percentile | 57 |
| Min | 23 |
| This Session's Score | 35 |
| Total Reference Site Samples | 162 |
| Mean | 65.27 |
| Standard Deviation | 12.31 |