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

Boone River Stratford

Analysis Summary for Series #2082

Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)

Metric Name Value Score
MH Total Taxa 29 5.58
SH Total Taxa 11 4.85
MH EPT Taxa 20 7.41
SH EPT Taxa 9.33 6.35
MH Sensitive Taxa 5 4.55
SH Ephem % 34.26 4.38
SH EPT % 56.09 5.87
SH Chiron % 42.31 5.83
SH Scraper % 9.09 2.03
SH Top3Dom % 76.19 3.78
SH Dom FFG % 68.47 5.26
MHBI 5.05 7.22
*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 7/19/2017
Sampling Series Series #2082
Drainage Area (mi2) 887
Log(DA) 2.94792361983173
Calculation Last Updated 4/18/2025 6:46:46 PM
Sampling Gear Hess
BMIBI Score
53
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and habitat specialists are rare; EPT taxa are still dominant in abundance; however, the most-sensitive EPT taxa have been replaced by ept taxa that are more tolerant of organic enrichment; the community is not well-balanced; a few taxa clearly dominate in abundance, collector-gatherers or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:

Des Moines Lobe

This site is in the Des Moines Lobe ecoregion.

Ecoregion Map
0102030405060708090100BMIBI Score5159683084
Max 84
75th Percentile 68
Median 59
25th Percentile 51
Min 10
This Session's Score 53
Total Reference Site Samples 161
Mean 58.18
Standard Deviation 13.09