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  Bureau of Freshwater & Biological Monitoring



New Index vs. NJIS

Historically, the New Jersey Impairment Score (NJIS), based on family level taxonomy, was used for the entire state to make assessments at three levels of impairment; non-impaired, moderately impaired, and severely impaired. New indices were developed, based on genus level taxonomy and grouped into three distinct geographical regions: high gradient (above the Fall Line), low gradient (Coastal Plain excluding the Pinelands), and Pinelands (the boundary of the Pinelands National Reserve plus a 5-km buffer). These new indices are called High Gradient Macroinvertebrate Index (HGMI), Coastal Plain Macroinvertebrate Index (CPMI), and the Pinelands Macroinvertebrate Index (PMI). These new indices replace the NJIS and offer a greater level of resolution using four levels of assessment; excellent, good, fair, and poor. A complete discussion of the new indices can be found in Appendix B of the AMNET SOP.


The following graph shows the change in assessments from the NJIS to the new indices. A significant change is defined as an NJIS rating of severe or moderate improving to a new index rating of good or excellent or; an NJIS rating of non-impaired declining to a new index rating of fair or poor.
The majority of significant changes occur in the Pinelands with the changes being predominantly positive.



Click here to see Round 3 Data Summary





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