Cedar River Conesville
Analysis Summary for Series #1178
Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)
| Metric Name | Value | Score |
|---|---|---|
| MH Total Taxa | 25 | 4.81 |
| SH Total Taxa | 5 | 2.2 |
| MH EPT Taxa | 14 | 5.19 |
| SH EPT Taxa | 3.5 | 2.38 |
| MH Sensitive Taxa | 3 | 2.73 |
| SH Ephem % | 1.36 | 0.17 |
| SH EPT % | 15.9 | 1.66 |
| SH Chiron % | 83.65 | 1.65 |
| SH Scraper % | 0 | 0 |
| SH Top3Dom % | 94.1 | 0.94 |
| SH Dom FFG % | 84.55 | 2.58 |
| MHBI | 5.74 | 4.67 |
| *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 | 9/8/2011 |
| Sampling Series | Series #1178 |
| Drainage Area (mi2) | 7788.867 |
| Log(DA) | 3.89147428804041 |
| Calculation Last Updated | 7/22/2025 3:38:43 PM |
| Sampling Gear | ArtSub |
Sessions used in this analysis
Warm Water
Poor
one substrate on bank - remaining were in very low velocity
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 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 | 78 |
| 75th Percentile | 55 |
| Median | 41 |
| 25th Percentile | 38 |
| Min | 20 |
| This Session's Score | 24 |
| Total Reference Site Samples | 12 |
| Mean | 46.83 |
| Standard Deviation | 17.37 |