King County's Benthic Index of Biotic Integrity (B-IBI) is composed of ten metrics that measure different aspects of stream biology, including taxonomic richness and composition, tolerance and intolerance, habit, reproductive strategy, feeding ecology, and population structure. Each metric describes some aspect of the community that responds to degradation. The raw value of each metric is calculated, and from the raw value, a score of 1, 3, or 5 is assigned to the metric. The ten metric scores are then added to produce the overall B-IBI score that range from 10 to 50.
Descriptions of the ten metrics tested and developed for the Pacific Northwest may be viewed by clicking here.
Reports
To download a Word document containing B-IBI scores for streams around King County from 1994 through 2001, please click here.
Sampling and Analysis Plan (SAP) for new macroinvertebrate studies: Greater Lake Washington and Green-Duwamish River Watersheds Wadeable Freshwater Streams Benthic Macroinvertebrate Sampling and Analysis Plan.
2002 Report: Benthic Macroinvertebrate Study of the Greater Lake Washington and Green-Duwamish River Watersheds Year 2002 Data Analysis and 2002 Appendices.
