Iowa DNR
BioNet
River & Stream Biological Monitoring
Fish and Benthic Macroinvertebrate Surveys
Physical Habitat Assessments

English River Riverside

Analysis Summary for Series #561

Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)

Metric Name Value Score
MH Total Taxa 25 4.81
SH Total Taxa 10.33 4.55
MH EPT Taxa 14 5.19
SH EPT Taxa 7.33 4.99
MH Sensitive Taxa 4 3.64
SH Ephem % 10.34 1.32
SH EPT % 70.21 7.35
SH Chiron % 27.42 7.33
SH Scraper % 7.38 1.65
SH Top3Dom % 83.18 2.67
SH Dom FFG % 60.85 6.52
MHBI 5.99 3.74
*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 9/24/2002
Sampling Series Series #561
Drainage Area (mi2) 626.907
Log(DA) 2.79720311916804
Calculation Last Updated 10/28/2025 3:11:36 PM
Sampling Gear ArtSub
BMIBI Score
45
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and habitat specialists are rare; EPT taxa are still dominant in abundance; however, the most-sensitive EPT taxa have been replaced by ept taxa that are more tolerant of organic enrichment; the community is not well-balanced; a few taxa clearly dominate in abundance, collector-gatherers or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:

Upper Mississippi Alluvial Plain

This site is in the Upper Mississippi Alluvial Plain ecoregion.

Ecoregion Map
Max 78
75th Percentile 55
Median 41
25th Percentile 38
Min 20
This Session's Score 45
Total Reference Site Samples 12
Mean 46.83
Standard Deviation 17.37