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

North Skunk River Hayesville

Analysis Summary for Series #1623

Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)

Metric Name Value Score
MH Total Taxa 36 6.92
SH Total Taxa 12 5.29
MH EPT Taxa 14 5.19
SH EPT Taxa 10.33 7.03
MH Sensitive Taxa 6 5.45
SH Ephem % 14.8 1.89
SH EPT % 71.9 7.53
SH Chiron % 27.42 7.33
SH Scraper % 12.43 2.78
SH Top3Dom % 66.04 5.39
SH Dom FFG % 53.6 7.73
MHBI 5.36 6.07
*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 10/7/2013
Sampling Series Series #1623
Drainage Area (mi2) 631
Log(DA) 2.80002935924413
Calculation Last Updated 10/28/2025 3:10:39 PM
Sampling Gear ArtSub
BMIBI Score
57
Warm Water
Good
Series Analysis Notes

Velocity a the art subs was good on retrieval but was likely less than desirable during much of the deployment.

BMIBI Score Explained

This site was analyzed using the BMIBI-Warm Water assessment methodology.

Sites that score between 56 - 75 are considered good. A slight reduction in number (Ephemeroptera, Plecoptera, Trichoptera) of taxa; however, good numbers of taxa are present, including several sensitive species, EPT taxa are fairly diverse and dominate the community. The most sensitive taxa and some habitat specialists may not be present and/or are reduced in abundance. The community is balanced, with no taxon excessively dominating in abundance. One functional feeding group, often collector filterers or collector gatherers, may be somewhat 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:

Rolling Loess Prairies

This site is in the Rolling Loess Prairies ecoregion.

Ecoregion Map
Max 86
75th Percentile 69
Median 61
25th Percentile 54
Min 20
This Session's Score 57
Total Reference Site Samples 127
Mean 61.08
Standard Deviation 10.7