IBIs recognized five distinct integrity classes, each defined by a subrange of themaximum possible range (12 - 60) of ISI scor.es (Karr et al.
1994: based on mean of three IBI
scores per site; Mebane et al.
Variability in IBI scores attributable to within-year
variation could be quantified by sampling each site at least twice in the same samplingseason, but separated enough in time to limit the effect of the first sampling bout onsubsequent ones.
1986); however, Karr et
5al.
Allowed
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