Little Waterman Creek Waterman Creek SWMA - Hartley (RMN Trend Site)
Analysis Summary for Series #2077
Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)
| Metric Name | Value | Score |
|---|---|---|
| MH Total Taxa | 17 | 4.39 |
| SH Total Taxa | 10.33 | 6.8 |
| MH EPT Taxa | 4 | 2.19 |
| SH EPT Taxa | 3 | 2.93 |
| MH Sensitive Taxa | 1 | 1.23 |
| SH Ephem % | 7.41 | 0.95 |
| SH EPT % | 20.33 | 2.13 |
| SH Chiron % | 43.85 | 5.67 |
| SH Scraper % | 11.22 | 2.51 |
| SH Top3Dom % | 70.78 | 6.7 |
| SH Dom FFG % | 69.7 | 5.05 |
| MHBI | 5.91 | 4.04 |
| *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 | 8/28/2017 |
| Sampling Series | Series #2077 |
| Drainage Area (mi2) | 17.082 |
| Log(DA) | 1.2325387175306 |
| Calculation Last Updated | 7/22/2025 3:37:20 PM |
| Sampling Gear | Surb |
Sessions used in this analysis
Warm Water
Fair
All riffles were very poorly colonized. Unsure if stream had very low flow previous to fairly substantial rain within last couple of weeks.
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and habitat specialists are rare; EPT taxa are still dominant in abundance; however, the most-sensitive EPT taxa have been replaced by ept taxa that are more tolerant of organic enrichment; the community is not well-balanced; a few taxa clearly dominate in abundance, collector-gatherers or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 Reference Site. Reference sites represent natural stream qualities that are least disturbed by human activities within the watershed. These sites are then grouped by ecoregion to establish a benchmark against which other streams in the same ecoregion are compared.
EcoRegion Comparison
Scores for a sampling session are compared against reference sites within the same ecoregion:
| Max | 88 |
| 75th Percentile | 58 |
| Median | 51 |
| 25th Percentile | 45 |
| Min | 10 |
| This Session's Score | 37 |
| Total Reference Site Samples | 45 |
| Mean | 50.91 |
| Standard Deviation | 13.26 |