Benthic Macroinvertebrates

Benthic macroinvertebrate communities are sampled from four sites in EFPC and from two reference streams in the fall and spring of each year. 

The macroinvertebrate communities at EFK 23.4 and EFK 24.4 remained significantly degraded through 1998 (Figure 1).

However, subtle but persistent increases in total richness and the richness of pollution tolerant taxa at these sites indicate continuing improvement in water quality. 

The benthic macroinvertebrate communities at sites further downstream (i.e., EFK 13.8) appear only minimally impacted relative to reference conditions.


Figure 1. Total taxonomic richness (mean number of taxa/sample, SE) and total taxonomic richness of the Ephemeroptera, Plecoptera, and Trichoptera (mean number of EPT taxa/sample, SE) of the benthic macroinvertebrate communities in East Fork Poplar Creek (EFK) and a reference site (BFK 7.6) [EPT taxa include relatively pollution-sensitive species].

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Last Modified: April 17, 2001
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