Proportion of Tolerant Individuals
This metric was selected as a replacement for the percentage of white suckers as a more
regionally appropriate tolerant group in the northeast (Miller et al. 1988; Langdon 1992). In
New Jersey, a number of tolerant species are commonly found in small and large streams
representing a wide range of water quality conditions. These tolerant species adapt well to
changing environmental conditions and often become dominant at disturbed sites. This
metric is generally useful in distinguishing moderately and severely impaired conditions.